The American Journal of Engineering and Technology
102
https://www.theamericanjournals.com/index.php/tajet
TYPE
Original Research
PAGE NO.
102-128
10.37547/tajet/Volume07Issue07-12
OPEN ACCESS
SUBMITED
07 June 2025
ACCEPTED
25 June 2025
PUBLISHED
25 July 2025
VOLUME
Vol.07 Issue 07 2025
CITATION
Abhilash Atul Chabukswar. (2025). Life Cycle Analysis of Sustainable 3D
printed Ceramic Nozzles for Glass Quenching. The American Journal of
Engineering and Technology, 7(07), 102
–
128.
https://doi.org/10.37547/tajet/Volume07Issue07-12
COPYRIGHT
© 2025 Original content from this work may be used under the terms
of the creative commons attributes 4.0 License.
Life Cycle Analysis of
Sustainable 3D printed
Ceramic Nozzles for Glass
Quenching
Abhilash Atul Chabukswar
Industrial Engineer, SSW Advanced Technology, Sweetwater, TN,
USA
Abstract:
Additive Manufacturing of advanced Ceramics
can prove to be a potential breakthrough for high
precision applications like nozzle for glass quenching
process. This paper presents a conceptual Life Cycle
Analysis (LCA) framework to assess the environmental
sustainability of 3D printed ceramic nozzles, focusing on
lithographic manufacturing of alumina-based ceramic
components. From extensive literature research
adjoining ceramic Advanced Manufacturing process,
material properties, energy consumption, and end of life
analysis, this study explores key indicators that drive
environmental impact and design considerations. This
study further estimates the impact of sustainable
manufacturing on industry 4.0 and strategizes the
process considering material efficiency, energy inputs,
and circularity potential. The presented facts indicate
that advanced manufacturing of ceramic nozzles could
substantially minimize waste, improve thermal
performance and ensure greater lifecycle sustainability
in comparison to traditionally manufactured nozzles.
This paper aims to address the gaps by defining key
concepts
for
sustainability-driven
design
and
assessment of AM ceramic components in thermally
intensive industrial Application.
Keywords:
Life-Cycle
Assessment,
Additive
Manufacturing, Circular Economy, 3D printing Ceramic,
waste reduction, green manufacturing, lithography -
based ceramic
1.
Introduction
1.1.
The Critical Role of Ceramic nozzles in Demanding
Industrial Process
The American Journal of Engineering and Technology
103
https://www.theamericanjournals.com/index.php/tajet
Due to the extraordinary mixture of properties, the
demand for ceramic material application is growing
tremendously. Ceramics are wear-resistant, naturally
stable at high temperatures, with excellent chemical and
mechanical properties. [1]. The unusual combination of
covalent and ionic bonds in this ceramic crystalline
structure is the main characteristic making them stable
but high performers in hard conditions. Such bonding
makes them stable and allows them to perform
exceptionally under harsh conditions. Their intrinsic
brittleness is a more general feature of advanced
materials, where bonding at the atomic level is pushed
to the maximum. [2], [3]. Ceramics thus represent a
pathway, which is also being explored with many other
classes of modern materials, to achieve nature-like
performance in man-made objects. Zirconium oxide,
silicon carbide, and alumina are more commonly used as
ceramics tailored to serve tough requirements.
In a cross-section of industries, nozzles are at once
inconspicuous and critical components that govern the
flow of liquids, gases, and even abrasive media. These
AM Ceramic nozzles provide accuracy and consistency
for the overall range of processes, while any
irregularities, failure, or decline in their performance can
extensively hamper the operational efficiency,
maintenance overhead, quality, and safety of the
process. [1], [2]. Figure_1 Describes the production
process of ceramic parts using lithography-based 3D
printing process wherein software like SolidWorks or
Catia are used to design the part in detail and converted
to .stl file which is sliced through slicers programs. This
sliced file is then provided to 3D printer which uses
Arduino to control XYZ axis of the printer and thus a
ceramic part is made. This 3D printed part is further
sintered, and debinded for hardness and thermal
tolerance. While selecting specific materials it is critically
important to understand the application, reliability,
performance and economy; hence, choosing ceramics as
an effective, high performing material is a strategic idea
for overall improved efficiency and integrity. [1], [2].
Figure 1: Ceramic Process flow Diagram [8]
To achieve proper tempering, it is believed to increase
the value of shocking the parts off of a high
temperature, thereby creating rapid cooling. The
ceramic nature of the parts is a key element with regard
to glass itself making a change from tempering to
quenching. Another example of this is in the hot oven,
the ceramic part allows glass to flow through, however,
the part itself is tempered as the air nozzles spray
controlled air during the quench. Within the quenching
processes the concept is the same as liquid quenching,
mist tempering or fluidized bed alumina tempering; air
cooling during the process must still be controllable. The
justification for this is to create a wider range of
possibilities for using a ceramic nozzle with its ideal
thermal resistance and high thermal shock capabilities
[1],[3]. How the nozzle is built should also help promote
uniform cooling / tension distribution of the glass while
promoting safety and quality.
1.2.
AM Benefits in Complex Ceramic components
The impact of additive manufacturing (AM) technology,
also referred to as three-dimensional (3D) printing, on
the operational practices of manufacturing is starting to
generate paradigm shifts. Conventional ceramic
materials manufacturing processes such as die pressing
The American Journal of Engineering and Technology
104
https://www.theamericanjournals.com/index.php/tajet
and injection molding, and machining processes, have
long processing times and costs, and an inability to
produce complex parts geometries [1]. Ceramics have
hardness and brittleness which makes them extremely
complicated to machine, and this complexity
compounds the use of the manufacturer's processes and
increases scrap rates. Additive manufacturing, on the
other hand, builds up the complex structure one layer at
a time, with the seamen of 3D CAD models, and can
drive agility and flexibility in production. The movement
away from traditional shaping of materials allows for
engineers to design a fundamentally better overall
design that incorporates functionality and structural
optimization. [5]
Ceramic additive manufacturing process is broadly
categorized
into
various
diverse
specialized
technologies based on the feedstock forms: Slurry-
based methods (Stereolithography, Digital Light
procession and direct ink writing), power-based
methods (selective laser sintering, selective laser
melting and binder jetting), bulk solid-based methods
(laminated object manufacturing). [4]
Even though the ceramic AM has many useful
advantages, it also comes with some challenges. The
post processing steps specifically with the removal of
organic debinding, and high temperature sintering
remain the primary concerns. [2]. These stages being
high energy intensive are critical to attain the required
structural properties but can introduce numerous
quality defects like cracking, deformation, and
delamination if not conducted properly. [1]. There are
also drawbacks for industry adoption to consider -
surface finish, resolution and high equipment costs, and
unacceptable production speeds - except for highly
valuable applications for new advanced product
manufacturing.
1.3.
Sustainability and Live Cycle assessment in
modern Manufacturing
The increased international concern over climate
change, depletion of resources, and waste generation
are imposing structure limitations on businesses and
their sustainable manufacturing processes. The goal is to
minimize emissions as well as energy and raw material
consumption, while extending product life cycles
through a circular economy. When it comes to material
efficiency, high rework capability and low scrap
generation, advanced additive manufacturing can be
considered promising (waste reduction from 90% to
10%). [15]. Due to its streamlined energy consumption,
AM’s capability to min
imize environmental impact in
conjunction with the goals of circular economy greatly
enhances its value in sustainable production.
While AM saves material in the production process, it
often generates harmful emissions and may require
post-processing steps which consume a lot of energy,
especially in ceramics. The framework provided by the
ISO 14040/44 Life Cycle Assessment (LCA) standard
helps in evaluating the actual environmental
implications of additive manufacturing, taking into
account the entire product lifecycle. [22]. For AM to
have a positive impact on sustainability, significant
attention must also be given alongside waste reduction,
enhanced energy efficiency, development of greener
materials, and improved waste management systems.
[23].
1.4.
Defining study Goals and identifying Research Gap
For AM machines and auxiliary systems, existing Life
Cycle Assessment (LCA) research lacks complete life
cycle inventory (LCI) data for some AM techniques, such
as Directed Energy Deposition.[25] Furthermore, most
research ignores post-manufacturing activities and
environmental aspects, including real waste generation,
solvent
toxicity,
the
limited
availability
of
environmentally friendly printable inks, and the large
carbon emissions associated with post-processing
(thermal processes tend to be energy intensive). [6] [18].
It has become hard for industries to make a data-driven
decision on the adoption of Ceramic AM's sustainable
technology due to the absence of information on the
environmental impact of ceramic AMs. [25]
Considering the following gaps, it is necessary to
conduct a detailed life cycle assessment (LCA) of 3D
printed ceramic nozzles specific for glass quenching
applications. From previous studies and research, these
ceramic AM nozzles have never been assessed for
sustainability, even though they are considered optimal
for industrial use. This study provides important
measurements of the environmental importance of raw
material extractions to final disposal and identifying key
impact drivers. The purpose of this research is to
generate insightful data by drawing attention to a
functional, high-value application, which can guide
process improvement and enable the sustainable
application of
ceramic
additive manufacturing
technologies in the production of glass and in industrial
environments at a large scale. Furthermore, this study
also discussed the contribution towards circular
economy goals, green production, recyclability, and life
cycle extension.
2.
Literature review
This literature review compiles our knowledge about the
environmental impacts of additively manufactured
ceramic nozzles, specifically for thermally demanding
industrial applications, such as glass quenching, and
aims to identify key environmental impact factors,
outline the positive attributes and advantages of
Additive Manufacturing (AM), outline issues, and
identify potential areas for further research.
2.1.
Advancement in additice Manufacturing of
The American Journal of Engineering and Technology
105
https://www.theamericanjournals.com/index.php/tajet
Ceramics
The use of ceramic materials is becoming more
prominent due to their wear resistance, temperature
stability, mechanical and chemical properties, critical for
demanding processes like the rapid cooling of glass.
Existing methods of ceramic fabrication such as die
pressing and injection molding, which are restrictively
expensive, slow, and unable to produce complex
geometries, also have limitations in converting
complicated shapes to ceramic due to their hardness
and brittleness, often producing excessive waste in
machining. [1]
Additive Manufacturing (AM) changes the narrative by
creating parts layer by layer directly from digital designs,
providing greater flexibility in designs and structural
performance, while providing new opportunities to
overcome the limitations of traditional methods.
Ceramic AM-classification can be based on the type of
material and method of printing. [1], [2]. These methods
allow optimal advanced shapes with strength, Thermal
performance and overall efficiency by utilizing slurry
consists of stereolithography and digital light processing
or powder that consist of binder jetting and selective
laser sintering or solid material consist of laminated
object manufacturing. [5].
Surprisingly, lithographic VAT photopolymerization of
ceramic successfully demonstrated ability to create
precise applications like alumina aerospike nozzles. [31].
New technologies that have potential are exploring
binder jetting and direct ink writing, which alleviate
issues with high sintering temperatures and the brittle
nature of conventional ceramics and will simplify the
ability to produce high quality parts at an industrial-
quality price these are aimed to develop. [5], [31].
2.2.
Material Efficiency and Waste Reduction
Selecting specific types of material and efficient
utilization by reducing waste offers a tremendous
possibility of sustainability in additive manufacturing.
The differences in the process by which AM produces
parts can reduce material waste or scrap by over 60% to
90% versus the traditional methods. For example, Figure
2 shows alumina based ceramic nozzles produced using
a mode of AM called lithography-based AM, waste is less
than 3%, meaning over 97% of the original material, the
resin slurry, is actually used as intended. In contrast, the
standard CNC (Computer Numerical Control) process for
ceramics is 85%. As a result, a 150g nozzle made by AM
=4.5g (3%) of waste, compared to the 22.5g (15%) of
waste generated by antecedent methods, for overall
scrap mass reduction of 94%. [14], [30].
Figure 2: Material Efficiency comparison [50]
In addition, AM produces little, if any waste and on rare
occasions generates between 1% - 3% waste that can
often be used again by being reclaimed (i.e. turned back
into a slurry) that can increase material utilization. AM
systems and AM practices and engender and support
principles of a circular economy by allowing reuse of
The American Journal of Engineering and Technology
106
https://www.theamericanjournals.com/index.php/tajet
materials. For example, ceramic waste can be crushed
and added back into photopolymer resins on a 30-40%
level and still attain size fidelity. [14]. In addition to all
these benefits, AM may relatively facilitate the repair of
parts while maintaining the performance of the part,
possibly increasing nozzle lifetime by 2.3 times versus
traditional forms of repairing. Emerging state-of-the-art
recycling
strategies,
particularly
hydrothermal
dissolution, can recover as much as 98% of alumina from
used AM systems, showing that AM can add new
sustainable and circular processes to the economy.
2.3.
Energy Cosumption and Environmental Impact
Ceramic Additive Manufacturing (AM) processes
consume a lot of energy, especially at the pre-
production stages such as curing and drying, plus during
the post-production stage, high-temperature sintering
which usually varies between 1.5 - 2.5 MJ/ cm3. While
energy is consumed in all AM processes, particularly by
the end user, AM provides a great energy offset because
it manufactures parts with a higher level of shape
accuracy, resulting in reduced machining and by less
material waste. In reality, a traditional Kiln- Fired
ceramic production can consume energy between 30-42
Kilowatt/ Kg, while a sintering process in additive
manufacturing can consume energy between 15 -25
Kilowatt/ Kg, which is a reduction of 40% in energy
consumption. [6]
Reduction in raw material usage and post processing
tasks indicated that a total energy of 15 to 25% per part
less was required in additive manufacturing process
than conventional manufacturing. [12]. In a typical ten-
year usage stage, AM-based ceramics can offer energy
savings
of
1275
megawatt-hours
of
energy
consumption. Moreover, while the use of energy by AM
appropriate can be as little as 10 times or as much as 100
times greater than molding or machining, the AM design
options, and longevity make up for these increases in
energy use led to net benefits for environmental impact.
[34]
Further, literature shows that from the beginning of the
production stage to selling the final part, lithography-
based AM processes release an estimated 5.2 kilograms
of CO₂ equivalent kilograms for each kilogram of
alumina parts produced, a reduction of almost 39.5%
from kiln-fired ceramic processes. [12], [32]. These
reductions are from less waste generated, lower
embodied energy and logistics improved.
2.4.
Sustainability
and
Lifecycle
assessment
Framework
Life Cycle Assessment, or LCA, is the most
comprehensive method for assessing the sustainability
of ceramic additive manufacturing and is defined in ISO
14040 and 14044. LCA refers to the environmental
impact of a product from the extraction of raw
materials, through product use, to disposal. As people
become increasingly aware of climate change, waste
challenges, and resource constraints, LCA is used to
measure emissions, consumption of energy, and
resource use efficiency, and to inform better
environmentally-sound decisions about manufacturing
with lower environmental impact. [14]
Ceramic additive manufacturing supports the concept of
a circular economy, by reducing the amount of raw
material used, improving previous designs, and allowing
substitute or recycled materials. For example, lower
environmental impact could be achieved by using
recycled ceramic slurry and extending the life of nozzles.
However, LCA also needs to consider the energy
consumption for post-processing processes (particularly
high temperature material) and the challenges
associated with recycling advanced ceramics. [30]
LCA is conducted in four steps defining goal and scope,
life cycle inventory, life cycle impact assessment, and
interpretation. A central challenge for ceramic additive
manufacturing is the lack of specific and reliable
industrial data, as the majority of research into LCA is
conducted on broader ceramic applications or polymer
additive manufacturing. [18]. Nevertheless, LCA can
highlight potential areas for improvement, such as the
processes for high sintering temperature applications.
Standardized and reliable data is important for
establishing how ceramic additive manufacturers
contribute in a positive way towards the development of
sustainable and innovative manufacturing practices.
2.5.
Current Technological Challenges and Future
Directions
While ceramic additive manufacturing has promise,
there are a myriad of challenges that limit its
advancement and sustainability factors of the product
life cycle. A few of the variables include: the significant
energy used in the sintering process, speed of
manufacturing (2-5 mm or hour), ability to achieve nice
smooth surfaces and dimensional tolerances, and issues
associated with the USED materials such as reproducible
ceramic blends, almost no recycling of used resins, and
clumping or separation quality issues. Additionally,
there are high levels of job failure, typically between 8
to 12 % during sintering and post-processing processes
like debinding are releasing volatile organic compounds
(VOC). [16]
Currently about 1/3 of 3D prints resulting from this
process are considered waste related to failed prints or
support material. This highlights the need to improve
quality assurance and mechanisms for monitoring in
real-time. Further improvements will depend on
developing and implementing more sustainable
materials, designing greener approaches to sintering,
and developing usable recycling approaches. [19].
The American Journal of Engineering and Technology
107
https://www.theamericanjournals.com/index.php/tajet
Research should also consider LCA on certain
applications (i.e. glass quenching nozzles). It is critical to
establish cooperation and collaboration of all
stakeholders (industries, universities, and government)
to allow these developments and enable the sustainable
application of ceramic additive manufacturing to be
further developed.
3.
Sustainability Considerations in AM Ceramics
Ceramic Additive Manufacturing has proven to be a
revolutionary Opportunity supporting sustainable
production, specifically for high performance industrial
Parts
like
glass
quenching
nozzles.
Additive
manufacturing makes it possible for sustainable
production to attain the 3 important components,
material efficiency, design optimization, and low energy
consumption
compared
to
the
traditional
manufacturing methods. When it comes to high
thermally loaded components, the AM provides
significantly higher environmental benefits considering
life cycle impacts.
3.1. Material Efficiency and Waste Reduction
Near-net-shape manufacturing helps reduce the
material scrap by 60- 90%, which is one of the essential
goals of sustainability in Additive Manufacturing. In
alumina based ceramic nozzles, produced by lithography
based additive manufacturing gain more than 97 %
material utilization of ceramic resin slurry solidified
through an accurate photopolymerization, comparing to
a sharp contrast of traditional like CNC machine where
material utilization is not more than 85%. [14] For
example, comparing AM vs traditional CNC machining of
typical 150g nozzle used of glass quenching can
exemplify [30]:
•
(Waste
AM
= 150g x 3% = 4.5g per nozzle)
•
(Waste
traditional
= 150g x 15% = 22.5g per nozzle)
On top of the 1-3%, this scrap can be reused as a slurry
back into the system, improving raw material circularity.
3.2.
Energy Consumption and waste reduction
Energy utilization in ceramic AM significantly depends
on the preprocessing of curing the layer, Drying and
sintering. On top of the preprocessing, the additive
manufacturing also includes post processing that
becomes energy consuming depending on the material
and its energy intensive and high temperature sintering
process. Meanwhile, the actual fabrication processes no
matter if stereolithography or digital light processing
may be energy efficient based on material. Sintering can
consume anywhere from 1.5 to 2.5 MJ/cm³ depending
on the type of furnace and material [11] [26]. The reason
behind sustainability being an important factor consider
for industry 4.0 is because manufacturing field
consumes about 15% of world's energy. However, the
drawback of energy-intensive sintering is at least
partially offset by the accuracy of AM to produce net-
shape products and eliminate secondary machining,
which also reduces waste. Based on comparative
lifecycle assessments, AM made ceramic parts can
represent 15
–
25% less overall energy consumption per
functional unit compared to bulk made ceramics, largely
resulting from using fewer raw materials and having less
complicated post-processing requirements [11]. The
significance of these savings over a 10-year lifespan can
be traced by the following method [33]:
•
Δ E=0.15 x 850 MWh/yrs x 10 yrs = 1275 MWh
savings
Even though AM is a material inefficient process, total
energy consumption, particularly during pre- and post-
processing stages, may have a significant impact on
AM’s sustainability. Sometimes the debinding and
sintering stages of AM processes can utilize the most
energy, requiring 18
–
25 kWh/kg, or a reduction of 40%
compared to traditional kiln-firing cycles, which ranged
from 30
–
42 kWh/kg. High temperatures should be
considerable, such as temperatures required for ceramic
manufacture (up to 1600°C in glass-ceramic melt-
quenching). In addition, Table_1 estimates that the
specific energy consumptions (SEC) for many AM
processes may be 10
–
100 times greater than
conventional manufacturing processes. [14]. These
energy-related expenses are not without trade-offs:
while AM is energy intensive in direct energy use, design
freedom allows certain downstream advantages, such
as functional optimization and lifecycle energy savings.
Table 1: SEC comparison for AM processes [34].
Material
Additive process
SEC Range
(KWh/Kg)
Energy Distribution
Traditional
Manufacturing
Polymer (ABS,
PLA, etc.)
Vat
Photopolymerizati
on (VPP)
21
–
33
N/A
10
–
100x > conventional
molding/machining
processes
Polymer (ABS,
Fused Filament
23
–
346
Motors: 51.7%<br>
The American Journal of Engineering and Technology
108
https://www.theamericanjournals.com/index.php/tajet
PLA, etc.)
Fabrication (FFF)
Heating Elements:
41.4%<br>
Fans: 6.9%
Other
General AM
Processes
N/A
N/A
10
–
100x >conventional
molding/machining
processes
3.3.
Emmisions and Environmental Impact
The source of energy and sintering time have an
influence on the greenhouse gas (GHG) emissions for
ceramic AM. In a cradle-to-gate analysis, lithographic
AM of alumina products generated approximately 5.2 kg
CO₂
-eq per kilogram of end product, while the
traditional manufactured equivalents generated ≥ 8.6 kg
CO₂
-eq/kg [14], [35]. This 39.5% less emissions stem
from reduced waste, less embodied energy in the
handling of the material, and far less transport emissions
due to digital inventories.
Advanced ceramics such as alumina, have additional
features where it has a longer service life and greater
resistance to heat degradation, can reduce the overall
environmental impact per operational hour by
extending lifespan by 30 - 50% [7].
3.4.
Recyclability and End
–
of
–
Life consideration
Because of changes in microstructure and phase
composition, recycled AM ceramics are still difficult to
recycle. Figure_3 show the complexity of 3D printed
ceramic microstructure.
Figure 3: SEM Microstructure of Alumina Nozzles [1]
Circular ceramic processes like the reuse of waste
zirconia nozzles in tile production show new ways to
valorize waste ceramic components. [36]. The more
uniform composition of AM parts also contributes
further to end-of-life recycling by reducing the risk of
contamination when compared with traditionally
bonded ceramics with multiple phases. The resulting
1.14×10⁻⁵ kg CFC
-11 equivalent ozone-depleting
emissions per m² produced in traditional ceramic makes
mostly as emissions from kiln processes. AM eliminates
all VOC emissions from binder processes to the extent
that it’s not solvent
-based photopolymerization. [24].
Lithography processes typically obtain 85-92% reuse of
unfused ceramic powder when recycled post-process
while powder pressing techniques recover over 50%
more.
From Figure_4 Circular economic integration closed loop
AM system enables:
1.
Recycled Feedstock Integration:
Ceramic waste
can be crushed or powered and reintroduced in
photopolymer resin up to 30
–
40% without
affecting dimensional accuracy. [30]
2.
Component Refurbishment:
Nozzle life can be
extended by 2.3x compared to welding nozzle
repairs using laser assistance. [23]
3.
End-of-life material recovery:
Hydrothermal
dissolution can recover 98% of the Al2O3 from
spent AM components. [30].
The American Journal of Engineering and Technology
109
https://www.theamericanjournals.com/index.php/tajet
Figure 4: Ceramic AM circular economy model [18]
3.5.
Design for sustainability in AM Ceramics
Applying DfS principles (as mentioned previously) is one
of AM's principal sustainability advantages. The AM-
reported design of the nozzles would minimize pressure
drops and heat losses to ambient by optimizing fluid
flow paths, wall thickness, and thermal gradient
management, all of which could be optimized by
topology optimization and digital modelling. This would
yield an increase in energy efficiency in the glass
quenching system of 12%. [9]. Not only do these design
improvements
provide
benefits
in
terms
of
performance, but they also yield savings across an entire
system's energy consumption.
4.
Life Cycle Analysis (Conceptual Framework)
Life cycle assessment (LCA) is an extremely useful tool to
measure the impact of each stage of product life (from
raw material to end - of - life) on environment. A LCA
framework is necessary specifically for 3D printed
ceramic nozzles used in glass quenching to identify
environmental hot spots and improve the sustainability
of the process. The conceptual framework that follows
is agreed by ISO 14040/44 but also utilizes core
indicators from literature on ceramic additive
manufacturing (AM). [24], [30].
4.1.
Introduction to Life Cycle Assessment
The overall purpose of LCA is to quantify environmental
impact,
determine
where
"hotspots"
with
overwhelmingly higher burdens can be found, and
quantify useful insights to drive informed decision-
making for sustainable decisions. In the ever-evolving
field of additive manufacturing (AM), [14], LCA is a
powerful tool for objectively establishing if AM has any
meaningful environmental benefits relative to
traditional manufacturing processes. By methodically
identifying opportunities to optimize material and waste
efficiency, LCA can be a valuable help in transitioning
product's life to circular economy.
Adherence to international standards like ISO 14040 and
ISO 14044 are very crucial for life cycle assessment to be
considered as credible, coherent and equivalent
resources. Although both standards are guidance
documents for assessing life cycles (LCA) shown in
Figure_5 contain a description of the four main steps in
LCA which are goal and scope, life cycle inventory (LCI),
life cycle impact assessment (LCIA), and life cycle
interpretation, ISO 14044 contains a comprehensive set
of guidelines related to carrying out LCA in the real world
and is particularly useful in promoting transparency and
claiming comparable environmental performance. [20]
[22]
The American Journal of Engineering and Technology
110
https://www.theamericanjournals.com/index.php/tajet
Figure 5: Phases of LCA [28]
There has been widespread adoption of these ISO
standards for life cycle assessment across various
industries, including ceramic manufacturing via
traditional and additive methods, indicating that there is
a strong industry-wide commitment to measurable
sustainability metrics and a movement away from
qualitative 'green' marketing claims. Given the increased
market demand for environmental transparency and
external regulatory pressures, businesses are adopting
strong analytical techniques such as life cycle
assessment (LCA) in their business practices and
strategic planning. [20] [27] A developing industry
known for continuous ongoing improvement, and with
an increasing focus on measuring environmental
impacts, is already starting to utilize measurable
evidence of environmental performance which are often
concretized by the application of artificial intelligence
(AI) and machine learning (ML) with a view to processing
optimization and data analytical tasks in digital
manufacturing processes [20] [25].
4.2.
Methodological stages of LCA
LCA
methodologies
ensure
systematic
and
comprehensive evaluation of environmental impacts
and are categorized in four phases defined by ISO
14040/14044.
4.2.1.
Goal and Scope Definition
The primary goal of this life cycle assessment (LCA) is to
evaluate
the
environmental
sustainability
of
lithography-based alumina ceramic nozzles developed
through additive manufacturing, while also making a
functional comparison with concurrently manufactured
alumina nozzles. Goals of LCA can be specifically defined
into 2 stages of system boundaries and functional unit
(FU) becomes. [37].
4.2.1.1.
Functional Unit
In the case of a glass quenching line, the functional unit
of one alumina nozzle has a lifespan of 1000 operational
cycle. The functional unit is a way of measuring all the
system/not just the data point and comparing the
input/output and the environmental impacts in terms
quantify system efficiency that may impact the results
interpretation Depending on specific utilization and the
environment of application, ceramic AM parts might
have different functional units based on [38]:
•
Mass-based
: Mass-based method is most useful
when comparing all product types in different
production processes. The FU is often used to define
one kilograms of finished products that are ready to
sell to the final user for broad categories such as
ceramic sanitaryware. [26].
The American Journal of Engineering and Technology
111
https://www.theamericanjournals.com/index.php/tajet
•
Area-based
: The FU is typically 1 m² for porcelain
tiles in research examining building ceramic tiles.
This allows for the quantification of material inputs
(9.98 kg clay, 8.98 kg feldspar, 5.27 kWh electricity,
1.74 m³ natural gas per m²) and the resulting impact
on an area basis. [38]
•
Component-specific mass
: For complex materials,
such as ceramic matrix composites, where the
environmental relevance of the material is less
critical than the actual mechanical properties or
physical characteristics of the final product, the FU
might be 1 kilogram of SiC/SiC woven laminate. [38].
•
Service-based
: For reusable products, the FU may
include
the
idea
of
"break-even"
usage
considerations, --whereby, beyond the break-even
usage, reusable options have less total energy or
greenhouse gas emissions than single-use options.
•
Function-based
: The Fug of industrial components,
such as high alumina ceramic liners for coal nozzles
can be described in terms like "wear resistance
inside Coal Nozzle, increases service life with greater
than 2 folds."
4.2.1.2.
System Boundaries
These define the specific steps and activities covered by
the LCA and clearly define which are included and which
are not. Common definitions of system boundaries are
shown in Figure_6:
•
Cradle-to-grave:
This cradle-to-grave scope involves
manufacture, use, disposal, and raw materials.
Ceramics with a long life (>50 years) should usually
not need to be disposed of due to their low impact.
The system boundaries for Ceramic AM nozzles are:
[24], [37].
o
Materials
sources
(photosensitive
resin,
alumina nano powder)
o
Production (post-processing + AM fabrication)
o
Use-phase (systems to quench glass)
o
EoL (End-of-Life) (recycling, reuse, or landfilling)
•
Cradle-to-gate:
"Cradle-to-gate" relates to the time
phase from extraction of a raw material to the
product leaving the factory gate, without the use
and disposal phase. This is often used in LCAs as
concern with the environmental impacts of
components or material. [38].
Figure 6: LCA System Boundaries [10]
•
Specific to AM (Additive Manufacturing):
For an AM
system typical boundaries are defined to include the
extraction of raw materials, and the material
manufacture (for example, wire drawing and
The American Journal of Engineering and Technology
112
https://www.theamericanjournals.com/index.php/tajet
powder atomization), the product manufacture
phase (including 3D printing and post-processing
phases) and sometimes the post-manufacturing
phases like surface finishing. [23] [24]
•
Exclusions:
If the primary focus of the study is only
the environmental impacts on the production
process directly, certain phases like product
packaging or the consumed end-use phases,
purposely be excluded. [27].
4.2.2.
Inventory Analysis
All relevant material and energy inflows and outflows
are systematically inventoried and quantified during the
Life Cycle Inventory (LCI) step. [37]. Inputs include a
number of raw materials (ceramic powders, resins, and
binders), electricity, natural gas and water; outputs
include air, water and soil emissions; and process waste,
e.g., failed prints and support structures. [26] [38]. All
this is done for each process within the identified system
boundaries. For instance, in the ceramic production
process, robust LCI data also provides specific examples
of the composition of the ceramic dough and glaze as
well as specific inputs (i.e., 5.27 kWh/m² of electricity
and 1.74 m³/m² of natural gas). [39]. In the case of 3D
printing with ceramic with respect to the ceramic nozzle,
the ceramic LCI accounting will also take into account
the amount of material (resin or powder), energy used
by the printers and other systems, and the waste. The
caveat is the absence of robust, organized, and high-
quality industrial data does not permit the adoption of
this framework for the ceramic additive manufacturing
(AM) processes. [20]. It becomes very difficult to model
environmental impacts accurately, due to data
framework and LCA assumptions, often from weak
assumptions made that diminish the robustness of the
LCA findings. Therefore, due to the methodological
integrity of this LCI framework, strong and organized
data infrastructures are vital for the successful
application of this kind of LCI for the ceramic AM
processes.
Table_2 provide life cycle of ceramic nozzles in terms of
detailed material/ energy inputs and output of
environmental impact, while highlighting resources
consumption and emissions.
Table 2: LCI impacts on the environment. [14], [20], [26]
Stage
Material/Energy Input
Environmental Output
Feedstock composition
1.2 kg alumina slurry/nozzle
CO₂ from extraction and transport
AM Printing (DLP)
0.3 kWh electricity/ nozzle
VOCs (minimal), minor heat waste
Post-Processing (Debinding
+ Sintering)
4.5–6.0 kWh energy (~16–22 MJ)
1.5–2.5 kg CO₂-eq emissions
Use-Phase
Thermal wear-resistant nozzle
Prolonged lifespan reduces
replacements
End-of-Life
0.4 kg residual ceramic waste
Recyclable as filler or tile input
4.2.3.
Software used for LCA
The following software were used to conduct LCA for
Ceramic AM nozzles using methods like CML
–
IA 2012
(EN 15804 Complaint, EU standards), ReCiPe 2016 (H/A/I
versions), TRACI 2.1 (North American Standard) to
assess the cradle-to-grave or cradle-to-gate scenario
model [37]:
•
SimaPro:
It is an extraordinary LCA program that is
capable of compiling, analyzing and keeping track of
sustainability performance of products and services.
SimaPro assists in understanding the environmental
"hot spots" across an entire value chain from raw
material extraction to end-of-life disposal. It also
accommodates numerous impact assessment
methodologies and the ability to produce
transparent, scientifically based information to
support decision making.
•
GaBi:
It is a powerful LCA program that can be used
to perform an environmental assessment of various
goods, technologies and services, and the complete
life cycle. GaBi provides information about
materials, processes, and emissions to support
scenario modeling of eco-design projects, and
compliance with environmental legislation.
•
Umberto NXT
: It is a sophisticated LCA program that
is designed for an expert-level environmental and
climate impact assessment. It provides graphical
modeling of life cycle for products, allows for the
optimization of resource and energy efficiency, and
The American Journal of Engineering and Technology
113
https://www.theamericanjournals.com/index.php/tajet
cost
accounting
for
the
manufacture
of
environmentally preferred products. Umberto LCA+
provides traceability and comprehensive reporting
of conforming with existing standards.
4.2.4.
Impact Analysis
The Life Cycle Impact Assessment (LCIA) phase
takes Life Cycle Inventory (LCI) data and converts it into
quantifiable environmental impacts. [14]. Many
environmental and human health impacts for ceramics
in additive manufacturing (AM) - for example, the
emissions of resin and photo initiators - demonstrate
the importance of attending to local environmental and
human health impacts, rather than solely focusing on
the global implications of climate change. The
manufacturing of ceramic AM products will also require
new approaches to safer chemical formulations and
emissions control technology. For ceramic 3D printed
Nozzles, the comparison of midpoint indicators is as
follows:
•
Global Warming Potential (GWP):
GWP is usually
measured in Kilograms of Carbon dioxide equivalent
(Kg CO
2
eq) [40].
GWP =
∑
𝐴𝑐𝑡𝑖𝑣𝑖𝑡𝑦
𝑖
× 𝐸𝐹
𝐶𝑂
2 −𝑒𝑞,𝑖
𝑛
𝑖=1
[23]
o
AM Nozzle ≈ 5.2 Kg CO
2
eq/ unit
o
Traditional Nozzle ≈ 8.6 Kg CO
2
eq/ unit
o
Reduction ≈ (8.6 –
5.2) / 5.2 = 39.5 % reduction
•
Cumulative Energy Demand (CED):
Measures the
total cumulative amount of primary energy utilized
by a product throughout its life cycle.
CED =
∑
𝐸𝑛𝑒𝑟𝑔𝑦 𝐼𝑛𝑝𝑢𝑡
𝑗
× 𝐶𝑜𝑛𝑣𝑒𝑟𝑠𝑖𝑜𝑛 𝐹𝑎𝑐𝑡𝑜𝑟
𝑛
𝑗=1
[41]
(1kWh = 3.6 MJ)
o
AM Nozzle ≈ 6.8 –
8.2 kWh = 24.5
–
29.5 MJ
o
Traditional Nozzle ≈ 89.4 –
11.3 kWh = 33.8
–
40.7 MJ
o
Reduction ≈ (37.25 –
27) / 37.25 = 27.5 %
reduction
•
Material Efficiency:
Material Efficiency can be
defined as the percentage of usable materials out of
the total material.
Material Efficiency (%) =
𝑀𝑎𝑠𝑠
𝐹𝑖𝑛𝑎𝑙
𝑀𝑎𝑠𝑠
𝑖𝑛𝑝𝑢𝑡
x 100
o
AM Nozzle yield ≈ 97 %
o
Traditional Nozzle ≈ 85%
o
Reduction ≈ (97 –
85) / 85 = 14.11 % reduction
[42]
•
Ozone Depletion Potential (ODP):
Express
depletion of ozone layer from the environmental
impact in CFC
–
11 equivalent (Kg CFC-11 eq).
ODP =
∑ 𝐸𝑚𝑚𝑖𝑠𝑖𝑜𝑛
𝑖
× 𝑂𝐷𝑃
𝑓𝑎𝑐𝑡𝑜𝑟,𝑖
𝑖
[42]
o
AM Nozzle yield ≈ 3.1 x 10
-6
Kg CFC-11 eq
o
Traditional Nozzle ≈ 5.4 x 10
-6
Kg CFC-11 eq
o
Reduction ≈ (5.4 –
3.1) / 5.4 = 42.6 % reduction
•
Abiotic Depletion (Fossil + Elements):
Abiotic
Depletion helps to measure the non-renewable
resource consumption that includes fossil fuels and
other elements.
ADP =
∑ 𝑀𝑎𝑡𝑒𝑟𝑖𝑎𝑙
𝑖
× 𝐴𝐷𝑃
𝑓𝑎𝑐𝑡𝑜𝑟,𝑖
𝑖
[41]
Both Nozzle will use Fossil Fuel
o
AM Nozzle yield ≈ 3.1 x 10
-6
Kg CFC-11 eq
o
Traditional Nozzle ≈ 5.4 x 10
-6
Kg CFC-11 eq
o
Reduction ≈ (5.4 –
3.1) / 5.4 = 42.6 % reduction
•
Ecotoxicity:
It is a measurement of potential impact
of Process to ecosystem based on environment of
Marine Aquatic (MAETP), Freshwater aquatic
(FAETP) and Terrestrial (TEC).
o
MAETP (AM)(FDM) = 2000Kg 1,4-DCB eq
o
MAETP (AM)(Polyjet) = 4000Kg 1,4-DCB eq
o
MAETP (CNC) = 5000Kg 1,4-DCB eq
o
Reduction = (5000
–
2000) / 5000 = 60%
reduction
•
Human Health Impacts:
This encompasses
carcinogens, respiratory organics, respiratory
inorganics and radiation.
o
Respiratory Inorganics (AM) = 0.0023 Kg PM2.5
eq
o
Traditional = 0.0048 Kg PM2.5 eq
o
Reduction = (0.0048
–
0.0023) / 0.0048 = 52%
reduction
•
Acidification Potential:
Acidification is measured in
kilograms of sulfur dioxide equivalents (kg SO₂eq).
AP =
∑ 𝐸𝑚𝑖𝑠𝑠𝑖𝑜𝑛
𝑖
× 𝑆𝑂
2−𝑒𝑞 𝑓𝑎𝑐𝑡𝑜𝑟
𝑖
[41]
o
AM = 0.018 Kg SO
2
eq
o
Traditional = 0.031 Kg SO
2
eq
o
Reduction = (0.031-0.018) / 0.031 = 42%
reduction
The American Journal of Engineering and Technology
114
https://www.theamericanjournals.com/index.php/tajet
•
Photochemical Oxidation:
It is measured in
kilograms of ethylene equivalents (kg C₂H₄ eq) or
non-methane
volatile
organic
compound
equivalents (kg NMVOC).
o
AM Nozzle ≈ 0.0054 Kg C
2
H
4
eq
o
Traditional Nozzle ≈ 0.0098 Kg C
2
H
4
eq
o
Reduction ≈ (98
-54) / 98 = 45 % lower.
•
Water Scarcity:
It is measured in cubic meters of
water equivalents (m³eq).
WDP =
∑ 𝑊𝑎𝑡𝑒𝑟 𝐼𝑛𝑝𝑢𝑡
𝑖
× 𝑆𝑐𝑎𝑟𝑐𝑖𝑡𝑦 𝐼𝑛𝑑𝑒𝑥
𝑗
𝑖
[41]
o
AM Nozzle ≈ 0.17 m
3
eq
o
Traditional Nozzle ≈ 0.29 m
3
eq
o
Reduction ≈ (0.29 –
0.17) / 0.29 = 41 % lower.
4.2.5.
Interpretation
and
Hotspot
Identification
The final phase, Life Cycle Interpretation, systematically
compares the results obtained from the LCI and LCIA
phases to the goal and scope of the study. [37]. This
process continues to identify environmental hotspots
(for example, steps in nozzle production that are energy-
intensive), assesses the robustness of results with
sensitivity analysis, and offers an overall conclusion. The
LCA indicated that the most energy- and emission-
intensive stage is still sintering, as it accounts for greater
than 60% of the total energy use and approximately 70%
of GWP. However, this stage can be ameliorated
through optimized part shapes that utilize less bulk
while increasing thermal performance, which will
effectively prolong nozzle life, and reduce total
environmental impacts. [21].
For an example, in industrial setting, replacing 1,000
traditional nozzles with 3D-printed alumina nozzles that
are 30% longer in length could reduce output volume by
23% over a 5-year period, saving approximately 3.4 tons
of CO₂
-eq roughly and 2.1 MWh of energy.
4.3.
Application of LCA to Ceramic AM Nozzles
It is important to consider an industrial application of
LCA framework applied to 3D printed Ceramic nozzle to
reveal specific environmental impact. The study assists
in recognizing and assessing environmental loads
starting from raw material extraction to end-of-life care,
enabling data-Driven process design and optimization
(ISO 14044, 2006).
4.3.1.
Raw
Material
Acquisition
and
Preparation
This stage involves the extraction and preliminary
processing of ceramic powders as well as a binder/resin
for nozzle manufacturing. As per Figure_7, highly pure
Alumina (Al₂O₃), which is oxidized aluminum, is a
predominant raw material in ceramic additive
manufacturing. These raw materials are processed by
atomization or preparation of slurry, and they may also
use photo-reactive resins through processes like SLA or
DLP. [12]. Unlike more conventional approaches, AM
employs specialist rheological formulations, while it
inherits some upstream burdens and issues from the
traditional processing of ceramic materials. Production
of alumina (or zirconia, Zr
O₂) involves the extraction,
mining and grinding of ore, and Hall-Heroult smelting
technology which uses an estimated 15.37 kWh/kg
aluminum. [12]. The production of resins, most of which
originate from petrochemical feedstock, also has
environmental implications; promising movement has
been made to identify bio-based alternatives. In terms
of circularity and sustainability, there are examples of
recycling actions in this source stage such as using waste
from zirconia nozzles in tile production. [14]
The American Journal of Engineering and Technology
115
https://www.theamericanjournals.com/index.php/tajet
Figure 7: Raw Material acquisition Process [43]
Table_3 quantifies the impact of ceramic raw material
production on environment.
•
Energy Demand: ~150 MJ/ Kg Al
3
O
3
[14], [32].
•
Emission Factor: ~ 9.4 Kg CO
2-eq
/ Kg [14].
Table 3: Material flow and emission in AM ceramic [14]
Process
Energy (MJ/kg)
GWP
(kg CO₂-eq/unit)
Produce Alumina Powder
150
5.2
Resin / Formulation Additives
22
0.8
Packaging & Transport (est.)
10
0.6
Total (Raw Material Stage)
182
6.6
4.3.2.
Manufacturing Phase
The process of ceramic additive manufacturing (AM) has
two phases that begin with material deposition using the
process - digital light processing (DLP) and
stereolithography (SLA), and through a series of
unavoidable post-processing steps, debinding and
sintering. Table_4 and Table_5 depicts that while
printing is in and of itself relatively energy efficient, post-
processing accounting for the majority of energy
utilization and overall environmental impact from
ceramic AM. Sintering consumes energy at 1.8-2.5
MJ/cm³ and at an estimate the amount of energy used
from a typical 50 cm³ deposit nozzle is ~117.5 MJ. The
facility uses an energy-efficient range of technology such
as radiation-assisted sintering (RAS) that not only utilizes
the least amount of energy but also can change energy
consumption from 25 MJ to 1 MJ or an approximate of
96% energy reduction with RAS. [5]. With the use of AM
stagnant material waste is lower than subtractive
processes, as AM forms approximately 33% internal
waste especially when it comes to failures from prints
and hazardous uncured resins. The emissions from the
burning off of the resins and binders including those
emissions classified as VOCs (volatile organic
compounds), and CO₂ (carbon dioxide), have negative
The American Journal of Engineering and Technology
116
https://www.theamericanjournals.com/index.php/tajet
environmental and human health implications. [5]. In
this Additive manufacturing process, VOC emission can
alter by 4 mg/hr, while CO₂ emission can be estimated
to 100 PPM. The aforementioned problems define why
it is important to optimize processes and the use of
sustainable feedstock in the ceramic additive
manufacturing process.
•
E
AM
= E
+ E
Sinter
= (0.15 + 2.2) x 50 = 117.5 MJ
•
GWP
AM
= 117.5 MJ x 0.0115 KgCO
2-eq
/MJ ≈ 1.35
KgCO
2-eq
Table 4: Energy Usage vs GWP per unit [14], [24]
Step
Energy Use
(MJ/unit)
CO₂-eq
(kg/unit)
3D Printing
7.5
0.09
Debinding
10
0.12
Sintering
100
1.15
Total
117.5
1.36
Table 5: Alternate impact Estimation [23]
Process Step
Energy Use
(MJ)
GWP (kg CO₂-
eq)
Printing (DLP)
1.2
0.18
Debinding
2
0.3
Sintering (avg)
9
2.5
Total
12.2
2.98
Sintering efficiency:
o
Traditional sintering: 25 MJ @ 6.945 kWh
o
Radiation assisted: 1 MJ @ 0.2778 kWh
o
Reduction: 96 % lower
4.3.3.
Use
Phase
and
Operational
Performance
Longevity and Lifecycle: Industrial nozzles that
have a high alumina ceramic liner will have a lifetime
approximately two or three times longer than a steel
nozzle, decreasing the replacement rate (and the overall
environmental response). Hard-faced steel coal nozzles
could last 8 to 12 months before needing to be replaced,
but ceramic-lined nozzles vary from a one to two-year
lifespan. Figure_8
features Ruichang’s Patented AL
2
O
3
ceramic nozzles, which display improved hardness,
strength, and corrosion resistance.
The American Journal of Engineering and Technology
117
https://www.theamericanjournals.com/index.php/tajet
Figure 8: Ceramic Air Nozzle for FCCU by Ruichang [13]
Table_6 demonstrates improved Performance and
efficiency in 3D printed ceramic allows for a high number
of complex geometries and new nozzle designs that can
be optimized for enhanced performance. It also shows
78% longer service life from AM ceramics and about
11.6% less quench energy consumed. A smooth ceramic
liner for coal nozzles reduces wear while enhancing fuel
efficiency by decreasing friction and improving the coal
flow. [7]. Life cycle assessments indicate that coal
nozzles with high alumina ceramic liners will have
approximately 52% lower greenhouse gas (CO₂)
emissions primarily through an increase in fuel efficiency
and overall lifespan. Porous ceramics (such as AM silica
aerogel) have the potential to provide exceptionally low
heat conductivities (natural measurements (or near) of
0.031 W m⁻¹ K⁻¹) improving thermal insulating
performance for use in furnace liner applications. [7]
Table 6: Net Operational Energy Savings in AM [14], [23
]
Metric
Conventional
AM Nozzle
Improvement
Average service life
(shifts)
280
500
78%
Quench energy per shift
(MJ)
95
84
−11.6%
4.3.4.
End-of-Life Management
The end-of-life (EoL) for ceramic nozzles presents both
issues relating to sustainability as well as opportunities.
Traditional ceramic nozzles are often thrown away when
worn out because of their denser, sintered structures
and inability to be recycled in any manner. [17]. Additive
manufacturing (AM) of ceramics has provided the design
capability needed to develop not only ceramic nozzles
that can be made-to-last longer than original production
processes, but they often rely on an additive process and
hence are more conducive to re-use and recycling. AM
nozzles can often have up to 20% of mechanical re-use
ability through grinding, 15% thermal recovery based on
organic boards and approximately 25% overall
volumetric waste due to mass. [36]. Table_7 discusses
some basic End-of-life strategies, Landfill and
Downcycling in terms of material recovery and CO
2
equivalence.
•
GWP
EOL
= Mass x Emission
•
GWP
EOL
= 0.5 Kg x 0.12 KgCO
2-eq
/ Kg = 0.06 KgCO
2-eq
The American Journal of Engineering and Technology
118
https://www.theamericanjournals.com/index.php/tajet
Table 7: Decrease in Landfill reduction ratio [14], [23]
End-of-Life Strategy
Material Recovery
CO₂-eq
Landfill (baseline)
None
0.06
Downcycling
Partial
0.03
AM feedstocks such as high-
purity alumina (Al₂O₃) or
zirconia (ZrO₂) requires energy
-heavy mining, grinding,
and purifying processes; and this raw materials stage
can have a pronounced effect on the environmental
impacts of EoL, however these earlier stages can be
alleviated with incorporation of recycled materials
(zirconia materials for example could be incorporated as
remanufactured waste zirconia products into ceramic
tiles). [17] The use of photopolymers in SLA/DLP makes
recycling difficult because they cure irreversibly.
However, with various flexible bio-based resins and
recyclable photopolymers, they come closer to realize
near-closed-loop
systems.
While
multi-material
ceramics (i.e., organic polymer or inorganic minerals)
would be inherently complex, simple EoL options can
include, for example, re-use as a refractory filler, or
reuse as a road base aggregate. [17].
4.4.
Quantitative Insights and Comparative Analysis
This segment of study provides quantitative perception
of 3D printed ceramic nozzle production impact on
environment.
4.4.1.
Energy Footprint Comparison
•
General AM vs. Traditional:
While low production
volume and complex products offer opportunities
for
lower
energy
efficiencies
in
additive
manufacturing (AM) thanks to no tooling, it's worth
noting that while AM specific energy consumption
must be considered, it can be 10 - 100 times that of
conventional manufacturing (moulding, machining,
etc).
•
Ceramic Nozzle Specifics:
o
Printing Phase: Using ceramic slurry based
printing methods (DLP, SLA) can use 30 - 80
kWh/kg. [44]
o
Sintering Phase (critical for nozzles) Traditional
sintering of 3D-printed alumina ceramic currently
requires 25 MJ. Radiation-assisted sintering (RAS)
may be able to reduce sintering to only 1 MJ, as
compared to the original methods of sintering, or
reduce it by 96%. [44]
4.4.2.
Potential Material Waste Reduction
Regardless of how we calculate and evaluate waste and
waste streams in the overall design and manufacturing
process, it is clear that AM produces 70-90% less
production scrap than some, if not most, traditional
manufacturing processes. Despite this fact, surveys say
that roughly 33% of all 3D printing processes generate
waste, and the majority of that waste is the result of
unsuccessful printing and the need for support
structures. This is a measure of the internal waste
associated with AM. [45].
4.4.3.
Emission Profile for ceramic AM
nozzles
Resin-based AM processes - which are relevant for the
manufacture of ceramic nozzles - can emit > 4 mg/h total
Volatile Organic Compounds (VOCs) by means of
SLA/DLP methods, and personal exposure to total VOCs
(TVOCs) while performing the work of 3D printing can be
substantially higher -
as high as 2.18 x 10⁴ µg/m³. The
heat degradation of the organic binders during
debinding - an essential, and necessary step for
production of ceramic nozzles - generates CO2 of up to
about 100 ppm for alumina bodies.
4.5.
Overall Life Cycle Assessment Summary
Material Efficiency:
The primary drive of sustainability is
material efficiency. There is substantial difference of
material utilization and waste generation between
additive manufacturing and traditional manufacturing
for ceramic nozzles.
Table_8 compares lithography-based AM and CNC
machining method for material Utilization, waste per
nozzle, and reusability of scrap.
Table 8: Material Efficiency Comparison
Manufacturing Method
Material Utilization
(%)
Typical Waste per
150g Nozzle (g)
Scrap Reusability
The American Journal of Engineering and Technology
119
https://www.theamericanjournals.com/index.php/tajet
AM (Lithography-based)
>97
4.5
Yes (as slurry)
Traditional
(CNC
Machining)
≤85
22.5
Limited
Energy Consumption:
The table summarizes a critical
factor of energy requirement and consumption between
additive manufacturing and traditional manufacturing
for ceramic nozzles and also denotes potential ways of
savings.
Table_9 depicts energy consumption comparison
between Lithography AM and Traditional Machining in
relation to sintering, overall lifecycle and 10-year
operation.
Table 9: Energy Consumption and Savings
Stage/
Process
Energy
Consumption
(AM)
Energy Consumption
(Traditional)
Notes
Sintering
(per
cm³)
1.5–2.5 MJ
2.5–4.0 MJ
Depends
on
furnace/material
Sintering (per kg)
18–25 kWh
30–42 kWh
AM can reduce by ~40%
Overall Lifecycle
(per part)
15–25%
less
than
traditional
Baseline
Due to less raw material and
reduced post-processing
10-Year
Plant
Operation
ΔE = 1275 MWh savings
(15% of 850 MWh/year
over 10 years)
—
Lifecycle energy savings
Emission and Environmental Impact:
This Table_10
provides the environmental benefits of additive
manufacturing over traditional manufacturing in terms
of emissions, Ozone depletion emission and service life
of material.
Table 10: Emission and Environmental Impact comparison
Metric
AM
(Lithographic
Alumina)
Traditional
Manufacturing
Reduction/
Notes
GHG Emissions
(kg CO₂-eq/kg)
5.2
≥8.6
39.5% lower with AM
Ozone-Depleting
Emissions
(kg
CFC-11-eq/m²)
Negligible/
None
1.14×10⁻⁵
AM eliminates VOCs
from binder processes
Service
Life
Extension
+30–50%
Baseline
Longer
service
life
reduces environmental
impact
Recyclability and End-of-Life:
The final factor that is
important for sustainability in manufacturing is End-of-
Life and recyclability. The following Table_11 outlines
potential
for
circularity,
recycling
rates
and
refurbishment, recycling challenges, reusability.
Table 11: Recyclability and End-of-Life comparison
Aspect
AM Ceramics
Traditional Ceramics
Notes
Recycled
Feedstock
Integration
Up to 30–40% in resin
Rarely used
No loss in dimensional
accuracy
The American Journal of Engineering and Technology
120
https://www.theamericanjournals.com/index.php/tajet
Powder Reuse (Post-
process)
85–92%
~50%
Higher for AM
Component
Refurbishment
Nozzle life ×2.3 (laser-
assisted)
Lower
AM enables easier
refurbishment
End-of-Life
Material
Recovery
Up to 98% Al₂O₃
(hydrothermal)
Lower
Efficient
recovery
possible with AM
Recycling Challenges
Microstructure
changes complicate
Multi-phase
contamination
AM’s uniformity aids
recycling
5.
LCA driven - Design and process Optimization
Integrating Life Cycle Assessment (LCA) into ceramic
additive manufacturing (AM) is an important step
toward environmentally responsible manufacture. LCA
is a valuable analytical tool that can identify
environmental hotspots and environmental impact
throughout the product life cycle, from raw materials
extraction to end of life. When assessing alumina-based
nozzles employed in glass quenching systems, LCA can
help provide data driven decisions to optimize design
iterations, material consumption, and processing
efficiencies. By identifying trade-offs and sustainability
benefits, LCA provides engineers with the means to
optimize functionality of 3D printed ceramics while
maximizing sustainability.
This formalized approach helps improve the circularity
and resource-utilization of production, and in doing so
promotes the general sustainable production agenda. As
AM technology matures, the incorporation of LCA will
ensure that provincial innovations are aligned with
responsible environmental utilization and ecological
sustainability.
5.1.
Design Optimzation Guided by LCA
Additive Manufacturing (AM) offers an exceptional
freedom of design principle that is critical in achieving
environmental sustainability of ceramic nozzles that
have or will be used in high-impact applications, such as
glass quenching. Life Cycle Assessment (LCA) produces
information that enables freedom of design and reaches
high functional performance and lower environmental
loads.
5.1.1.
Topology Optimization
Topology optimizations can be applied as a unit process
of AM and are a method of optimally placing material
with the functional loads, to create a lightweight
ceramic nozzle that has adequate durability. The
mathematical approach reduces the use of raw material,
the material that is to be sintered, and also the energy
for sintering while retaining the performance of the
system. Additive manufacturing achieves sustainability
by reducing waste, and energy significantly dropping the
GWP and CED. [46].
Table 12: Scrap reduction from topology optimization [14].
Nozzle type
Volume (cm³)
Mass (g)
Scrap reduction (%)
Traditional Nozzle
75
180
—
AM Optimized Nozzle
42
100
44.40%
LCA clearly indicated that the greatest components of
environmental loads in the ceramics sector were the
material use and energy in the sintering process. Hence,
Table_12 suggests topological optimization can
potentially help lower the material utilization by 30-50%
even after maintaining functional structure and
resulting in reduction of environmental load. LCA
acknowledges design/value economies and combines
environmental design principles and objectives in a
single method, making it a key approach and ideal in the
manufacture of ceramic components. [23]. In case for a
100g Alumina part,
•
Δ m = 100g x 32.5% avg = 32.5g of mass reduction
•
Δ E = 32.5g x 18 kWh/kg = 0.585 kWh per part
reduction in sintering energy.
It is also observed that the thermal performance
reduces the use
–
phase energy demands by 10-15%.
The American Journal of Engineering and Technology
121
https://www.theamericanjournals.com/index.php/tajet
5.1.2.
Flow Geometry Refinement
LCA (Life Cycle Analysis) brings attention to aspects of
operational-phase impact with regard to ceramic
nozzles. Additive Manufacturing (AM) gives designers
precise authority over internal flow paths, wall
thickness, and temperature gradients in additively
manufactured ceramic nozzles. For example, the designs
can include Computational Fluid Dynamics (CFD) logic
geared toward lowering turbulence, reduced pressure
drops and better spray patterns, leading to increased
thermal quenching efficiency and reduced energy
requirements per square meter of heat-treated glass.
About 12 % enhancement in energy efficiency can be
accomplished through these improvements. [7].
AM will also produce porous ceramic constructs that
have incredibly low thermal conductivities, such as
0.031 W/m·K for silica aerogel, allowing for better
insulation and less heat loss in high temperature
environments. When these improvements are
successfully incorporated into the operational phase of
ceramic nozzles, they work to significantly reduce the
energy consumption of the operational phase.
5.2.
Process Parameter Optimization
5.2.1.
Sintering Energy Reduction
Sintering is the most energy- and emission-intensive
step in ceramic additive manufacturing because it uses
more than 70-80% of the total energy and produces
nearly 70% of the Global Warming Potential (GWP).
Traditional sintering of 3D printed alumina ceramics
requires 25 MJ of energy, while new processes such as
radiation-assisted sintering (RAS) are able to reduce
these energy inputs to just 1 MJ.
Total sintering Energy (E
S
):
•
E
S
= m x c
p
x ΔT + E
hold
Where,
m = 0.25 Kg
c
p
= 0.88 KJ/Kg\K
ΔT = 1200 K
•
E
S
= 0.25 x 0.88 x 1200 + 500kJ = 1.8 MJ
For industrial example, a batch of 100 nozzles:
•
E
Optimized
= (0.25 x 100) x 18kWh/Kg x 0.85 = 382.5
kWh
•
E
Traditional
= (0.25 x 100) x 22 kWh/Kg = 550 kWh
Saving almost 170 kWh per batch. This is an incredible
energy reduction of 96% in the sintering cycle. [26].
5.2.2.
Debinding Efficiency
Debinding is an energy-intensive stage in the
manufacture of ceramic nozzles, which is typically when
some of the greatest VOC and CO₂ emissions occurs, and
the Life Cycle Assessment (LCA) suggests a consider
impact on Particulate Matter Formation and Human
Toxicity Potential. [5]. Low binder loading, heating
increments, and photopolymerization without solvent
are all means of reducing emissions and defects.
Lithographic AM produces less waste during the
debinding stage than polymer processes do, with
estimated savings of 30% for debinding time, and
produces less that 0.1-0.5 kg/kg resin of VOC emissions.
[35]. Optimized burnout profiles can reduce cracking,
improve efficiency, and lessen environmental impact
during binder removal.
5.3.
Case Study: LCA
–
driven Redesign of alumina
nozzles
To illustrate a practical industrial example of the impact
of LCA-driven optimized nozzles on the environment,
let’s consider 150 g of alumina nozzle used in glass
quenching process. Table_13 provides a comparison
between conventional manufacturing and Additive
manufacturing leads to the following results based on
efficiency, waste, and environmental factor [14], [26]:
Table 13: GWP comparison for traditional vs AM [14]
Performance Metric
Unit
Traditional
AM
% Reduction
Finished good Mass
g
150
150
—
Scrap Weight
g
120
7.5
94%
Production Rate
%
55.6
95.2
71.30%
Sintering Energy
kWh/kg
36
18
50%
Total Sintering Energy
(150g)
kWh
5.4
2.7
50%
Use-Phase Energy (10
years)
MWh
8,500
7,225
15%
The American Journal of Engineering and Technology
122
https://www.theamericanjournals.com/index.php/tajet
Cradle-to-Grave CO₂
Emissions
kg CO₂-eq/kg
8.6
5.2
39.50%
Cradle-to-Grave CO₂
per Nozzle
kg CO₂-eq
1.29
0.78
39.50%
Surface
Thermal
Efficiency (avg.)
%
72.4
80.3
10.90%
5.4.
Circularity-loop material system
The principles of a circular economy are becoming more
important for sustainable manufacturing and additive
printing has unique opportunities for integrating circular
economy principles into the lifecycle of ceramic nozzles.
5.4.1.
Recycled Feedstock Integration
Mechanical grinding of sintered ceramic debris is
currently only able to reuse up to 20% of recycled
material that was created as feedstock, but this is often
limited due to contamination and flowability issues.
Lithography-based
additive
manufacturing
(AM)
techniques for alumina nozzles already reuse 85-92% of
unfused ceramic powder. The 1-3% scrap generally
produced during processing can usually be reintroduced
into slurry, which typically results in a better circularity
of material. As studies have shown that the commercial
photopolymer AM process can successfully incorporate
30-40% recycled material into resins without reducing
dimensional accuracy, these are viable and sustainable
long-term solutions to increasing the recycled content in
the manufacture of ceramic nozzles. [47]
5.4.2.
End-of-Life Recovery
Figure_9 shows that thermal recovery, reuse, and
aggregate recycling are some of the end-of-life
alternative methods to AM ceramic nozzles. AM makes
refurbishment easy to conduct which allows for the life
of the nozzle to be 2.3 times longer. In addition, AM
enables recycling if the AM process uses a process called
hydrothermal dissolution which could recover up to 98%
of the Al₂O₃. [30] Additionally, there are some new
biobased resins that are beneficial to a closed-loop
sustainability in additive manufacturing.
Figure 9: Ceramic AM lifecycle recovery [47]
The American Journal of Engineering and Technology
123
https://www.theamericanjournals.com/index.php/tajet
5.5.
Energy-Environment Trade-off Analysis
Additive manufacturing, which provides functional
optimization of materials, results in overall energy
consumption that is 15-25 % less per functional unit of
the finished product. Ceramic nozzles are lightweight
and high-performance, meaning that over 10 years they
could save a company 1275 MWh of energy (not
accounting for other savings) and CO₂ emissions could
decrease in specific applications by as much as 52%.
Even though the sintering process in additive
manufacturing consumption is 100x more energy than
traditional methods, the Lifecyle benefits outweigh
them. [23]
Graph 1: To show a tradeoff between sintering time and energy consumption, a sample of 30 nozzles can be
used and illustrate a realistic range based on literature and hypothesis.
6.
Technological Challenges and future research
directions
It is important to discuss the challenges and future scope
of this study as ceramic AM of nozzles do possess many
technological opportunities to improve even though
they are highly sustainable and precise in applications.
6.1.
Current technological Challenges in Ceramic AM
nozzle production
6.1.1.
Material
and
Geometry
Challenges
Ceramic slurry production is arguably the most
challenging aspect of lithography-based ceramic
additive manufacturing (AM) approaches such as Digital
Light Processing (DLP) or Stereolithography (SLA). The
finished product’s performance and print quality
depend on the right viscosity, high solid content, and
repeatable cured properties. However, as the solids
content increases, so does viscosity, thereby decreasing
fluidity and causing challenges in the printed part. Most
photopolymer resins used in ceramic AM are also
permanently cured, limiting the recyclability option and
closing the material cycle. Phase separation
complications further amplify complexity with multi-
material ceramics, which leads to complications in end-
of-life recycling. [48]
High-resolution ceramic nozzles require extreme
accuracy, with dimensional tolerances (± 20 µm) and
concentration tolerances (± 30 µm). Due to binder
burnout and unpredictability in shrinkage occurring
during the sintering stage, it is difficult to exercise
control in creating small channels (<500 µm) and
smooth surfaces (roughness <20 µm) when creating the
feedstock.
The common cause of defects in AM is disparity in
rheology or agglomeration lead by particle size or poor
viscosity, hence the quality of raw material is highly
important in AM. While high-purity and uniformly scaled
nanoscale powders are quite expensive and difficult to
work with, they are suitable for adding to projects with
the feedstock's specifications. AM allows 3D printing
complex designs, but most features that require thin
walls or overhanging features (less than 1 mm) end up
warping or partially sintering, yielding rejection rates of
0
5
10
15
20
25
30
15
15.2 15.3 15.5 15.7 15.9 16.1 16.3 16.6 16.8 17.1 17.4 17.7 18.1 18.4 18.8 19.2 19.5 19.9 20.3 20.8 21.2 21.8 22.2 22.9 23.5 24.2
25
26.5
28
Energy Consumption vs Sintering time
The American Journal of Engineering and Technology
124
https://www.theamericanjournals.com/index.php/tajet
10-12% for intricate nozzle geometries. Also, it is
important to ensure the CAD model is corrected
immediately to avoid dimensional errors in the final
product when shrinkage (to 15%
–
20%) occurs during the
sintering process.
6.1.2.
Process limitations and Quality
control.
Despite additive manufacturing's (AM) claim to avoid
waste, approximately 33% of processes still generated
an internal waste stream primarily from failed prints and
support structures. While there are still some benefits of
AM in terms of avoiding wasted material in traditional
processes, support structures are necessary for printing
complex geometries, and they contribute to printing
inefficiency, and require laborious post-processing. [37].
The potential for very small particles and volatile organic
compound (VOCs) emissions must be considered when
using the resin-based methods of AM processes (like
SLA/DLP) even for ceramic nozzles.
Health and Safety Hazard notes are provided as the SLA
emissions of VOC are more than 4mg/hr and exposure
levels are higher than 2.18 x 104 even though enough
mandatory air ventilation is provided. As a reminder,
and with respect to ceramic AM processes, the organic
binder decomposes during debinding with about 100
ppm CO₂ in the portions based on alumina, and while the
binder is burned off, gases can be released quite
violently depending on an AM process type (for example
furan binder systems). [37] As for sintering, traditional
powder metallurgy processes enable sintering in
different types of hybrid systems for example, spark
plasma, microwave-assisted sintering to reduce energy
consumption and improve product throughput and
performance. Nevertheless, given that ceramic AM is
inherently a slow process (2-5 mm/hr), producing a 100
mm nozzle would expect to take 20-50 hr. AM processes
can experience failures during the sintering process of 8-
12%, and very little is done in situ to monitor the
processes; materials testing and evaluation often occur
through post-process computed tomography (CT) or 3D
scans. [37]
6.1.3.
Post Processing Challenges.
Ceramic additive manufacturing (AM) post-processing
methods generate a significant amount of energy use,
sintering and debinding in particular, and negatively
impact the environment. When sintering at 1,600°C, up
to 85% of the processing energy is used in sintering
alone, providing more than 70% of the global warming
potential (GWP), using on average 18-25 kWh/kg. Each
cycle of the entire batch with a weight of 10 kg will
contribute 180-250 kWh. Debinding takes between 8-16
hours but can release 0.5 kg of volatile organic
compounds (VOCs) for every kg of resin, for polystyrene
debinding. When fixed with dense green bodies, the
physical mechanism of rapid binding evaporation can
lead to internal pressure build up and create cracks in
green bodies and particularly in strongly cross-linked
polymers. [17]. Even when precise adjustment is
required to negligence sintering shrinkage of 15% to
20%, dimensional errors still occur. The absence of in-
situ monitoring would inhibit process control and real-
time fault detection during debinding and sintering
periods where they occur. Modelling techniques also
regularly fail to reliably predict the sintering behavior of
complex geometries. The data restrictions mentioned
above mean that life cycle inventories (LCIs) do not exist
for some common AM processes and adverse factors
such as solvent toxicity and post processing waste
receiving little to no consideration. All these factors limit
life cycle assessments (LCAs) and their ability to properly
complete sustainability assessment. [29].
6.1.4.
Cost and Scalability
Like any other technology, scalability and cost are
common hurdles for Ceramic AM. Quality ceramic
powders range from $80 to $120 per kilogram, and
commercial AM printers range from $200,000 to
$500,000. [23]. Despite the waste reduction benefits of
AM, because of the slow build rates, expensive post-
processing, and inability to manufacture large parts
(>100 mm) due to equipment tolerances and heat stress
in build plates and tool heads, adoption has been
constrained. Batch size is limited by furnace capacity and
build area; thus, expensive parallelization must occur to
scale production to hundreds of nozzles monthly.
Supply-chain restrictions for advanced ceramics such as
zirconia also continue to inflate material costs. Thus, AM
can only be employed for high value applications. The
cost of AM operations and often inconsistent
throughput limits cheaper prices to provide lower
operating costs will most certainly influence economies
of scale. [49]. Additive manufacturing helps with
intricate design of provide and can add minute details
unlike traditional manufacturing, however, this
complexity leads to challenges in scalability caused by
post processing. Although ceramic AM provides true
value in terms of design-flexibility and material
efficiency, industrial embrace will remain limited to
niche industries unless it can be demonstrated as
effective in highlighting cost effectiveness and brand
reliability in the supply chain.
6.2.
Future Research Directions
Efforts must be made to develop future research
opportunities focusing mainly on overcoming current
limitations assessed through life cycle to achieve fully
optimized 3D printed ceramic nozzles.
6.2.1.
Advanced Material Development
Additional investigations are necessary to better
The American Journal of Engineering and Technology
125
https://www.theamericanjournals.com/index.php/tajet
understand the bio based and recyclable ceramic
feedstock and binders that retain capacity after
redistribution. Bio-sourced resins that reform to
monomers could allow for a closed-loop process;
furthermore, waste from an industry, for example the
repeatability of use when printing zirconia nozzles could
allow for repurposing for environmental reusable
feedstock. In using more recycled feedstock there will be
a need for improved printability mechanical durability,
which is achieved by further developing the slurry
formulas of the ceramic and recyclability while low-
energy requirements could be realized especially
improvements up to 30-40% energy reductions can be
reached in glass-phase sintering or lower than 600 °C
sintering with additions of nanoparticles. Volatile
organic chemical emissions can be reduced by up to 90
% with biodegradable binders. [44]. The advantages of
using nanostructured zirconia and or multi material AM
would have a potential for developing nozzles with
improve performance preliminary calculations indicated
potential improvements in robustness versatility
provide exploitable materials characterized for
sustainability improvement. [49].
6.2.2.
Process Optimization and Control
It is important to reduce energy used in ceramic
AM from a sustainability standpoint, especially during
sintering. Using Radiation assisted sintering, alumina
can potentially reduce energy consumption by 96%,
although this assumption requires full-scale research.
This research can tremendously benefit from the
inclusion of ways to minimize waste, defects and VOC
emissions by utilizing structure free printing and
optimized debinding process. Biodegradable binders
also have important implications. There is real time
monitoring technology including thermal imaging and
optical tomography technology that could be used to
reduce defects by approximately 50%, while also
utilizing AI algorithms to optimize each user's printing
parameters as a feedback loop to reduce both energy
cost and reduce defect manufacturing that may include
energy costs to recycle. [44]. Over time, page an
amortized rate of energy consumption per part, but
continuous
sintering
furnaces
build
triplicate
throughout, with a potential triplicate reduction in
energy consumption per part. Hybrid processes are
emerging and include processes such as microwave
assisted sintering as well as spark plasma sintering which
demonstrates densification benefits, while contributing
to a lower carbon footprint.
6.2.3.
Data-Driven Approaches (AI/ML)
Machine learning applications for predictive
maintenance can reduce equipment downtime on
average 20-30%. Warping and shrinkage can be
predicted using improved accuracy and reduce waste
from digital twin system in simulated process. AI-
enabled quality prediction can eliminate defects at the
source when the parameters are associated with the
part outcomes from the process variables. [23].
Algorithms are trained in real-time data using different
sensors that include acoustic and thermal signals that
can also help pinpoint early warnings of equipment
failure. Environmental modelling that is trustworthy
should find a way to circumvent the challenges related
to no high-quality life cycle inventory (LCI) data. AI and
ML are trying to facilitate light-weighting in a much
shorter timeframe and improve effective designs.
Predictive model development using sustainable
manufacturing processes, successful object with poor
data infrastructure in ceramic AM need to populate the
AI/ML pipelines. [29].
6.2.4.
Techno-Economic and Environmental Trade-
Off Modeling
Future LCA tradeoff modeling should include a
relation between lifespan benefits and energy usage
related to it [14], for example:
•
Net Present Environmental Cost (NPEC):
∑
𝐶
𝑒𝑛𝑣,𝑡
(1 + 𝑟)
𝑡
𝑇
𝑡=1
C
env, t
= annual environmental cost,
r = discounted rate
AM can have specific energy use that is 10-100 times
higher but allows design freedom to open up and that
can produce optimized geometries which offer 15-25%
reduced lifespan energy. An example of this is that AM
ceramic nozzles could save a total of approximately 1275
MWh energy abundance over a service of ten years.
Future planning could include performance vs. cost vs.
effect on the environment, into predictive modelling,
and be guided by scenario modelling, multi-criteria
analysis, based on longer-term techno-economic
considerations, related policy incentives, or R&D issues.
[49].
7.
Conclusion
The holistic life cycle assessment (LCA) of lithographic
additive manufacturing (AM) for alumina-based ceramic
nozzles used in glass quenching is discussed in this
paper,
illustrating
this
technology's
enormous
opportunity for long-term, high-performance industrial
applications. The 3D printing processes are more
material efficient than conventional alternatives,
achieving 97% materials-utilization rates and over 90%
avoidance of landfill waste. Although sintering process
still requires energy, AM has lower greenhouse gas
emissions by about 40% to 5.2 kg CO2-eq/kg, and lower
energy use by up to 40%. The improvements to
sustainability are further enhanced by longer nozzle
The American Journal of Engineering and Technology
126
https://www.theamericanjournals.com/index.php/tajet
service lives, increasing the time period before
maintenance/ repair/ downtime is required by as much
as 50%.
There are still challenges related to recycling and its
energy intensive processing and microstructural
changes. However, adding Industry 4.0 tools and digital
inventory control, predictive maintenance will assist
with improvements to efficiency and sustainability.
Overall, AM for ceramic nozzles provides are a model for
sustainable manufacturing for thermally demanding
industries that not only mitigate operating costs and
environmental impacts, but also significantly advances
the transition to greener circular production methods.
8.
Reference
[1]
Z. Chen
et al.
, “3D printing of ceramics: A review,”
Journal of the European Ceramic Society
, vol. 39, no.
4,
pp.
661
–
687,
Apr.
2019,
doi:
10.1016/j.jeurceramsoc.2018.11.013.
[2]
Admin, “What is a Ceramic Nozzle Used For?”
Kessencera,
Sep.
22,
2023.:
https://www.kessencera.com/blogs/what-is-a-
ceramic-nozzle-used-for
[3]
“What is a silicon carbide Nozzle | The benefits of
SIC
nozzles
for
industrial
applications-
csceramic.com,”
CS
Ceramic
Co.
Ltd.
:
[4]
W.-J. Miao
et al.
, “Additive Manufacturing of
Advanced Structural Ceramics for Tribological
Applications: Principles, Techniques, Microstructure
and Properties,”
Lubricants
, vol. 13, no. 3, p. 112,
Mar. 2025, doi: 10.3390/lubricants13030112.
[5]
E.
Schwarzer-Fischer
et
al.
,
“Study
on
CerAMfacturing of Novel Alumina Aerospike Nozzles
by
Lithography-Based
Ceramic
Vat
Photopolymerization (CerAM VPP),”
Materials
, vol.
15,
no.
9,
p.
3279,
May
2022,
doi:
[6]
C. L. Cramer
et al.
, “Additive manufacturing of
ceramic materials for energy applications: Road map
and opportunities,”
Journal of the European Ceramic
Society
, vol. 42, no. 7, pp. 3049
–
3088, Jul. 2022, doi:
10.1016/j.jeurceramsoc.2022.01.058.
[7]
Z. Guo, L. An, S. Lakshmanan, J. N. Armstrong, S. Ren,
and C. Zhou, “Additive Manufacturing of Porous
Ceramics With Foaming Agent,”
Journal of
Manufacturing Science and Engineering
, vol. 144,
no.
2,
p.
021010,
Feb.
2022,
doi:
[8]
J.-H. Sim, B.-K. Koo, M. Jung, and D.-
S. Kim, “Study
on debinding and sintering processes for ceramics
fabricated using Digital light processing (DLP) 3D
printing,”
Processes
, vol. 10, no. 11, p. 2467, Nov.
2022,
Available:
[9]
J. Klein
et al.
, “Additive Manufacturing of Optically
Transparent Glass,”
3D Printing and Additive
Manufacturing
, vol. 2, no. 3, pp. 92
–
105, Sep. 2015,
[10]
P. Vitale and U. Arena, “An attributional life
cycle assessment for an Italian residential
multifamily building,”
Environmental Technology
,
vol. 39, no. 23, pp. 3033
–
3045, Aug. 2017, Available:
https://doi.org/10.1080/09593330.2017.1371252
[11]
B. Singarapu, D. Galusek, A. Durán, and M. J.
Pascual, “Glass
-Ceramics Processed by Spark Plasma
Sintering (SPS) for Optical Applications,”
Applied
Sciences
, vol. 10, no. 8, p. 2791, Apr. 2020, doi:
[12]
W. D. Silveira
et al.
, “Crystallization Kinetics and
Structure Refinement of CaTiO3 Glass-Ceramics
Produced by Melt-
Quenching Technique,”
Mat.
Res.
, vol. 24, no. suppl 1, p. e20210027, 2021, doi:
10.1590/1980-5373-mr-2021-0027.
[13]
Ruichang Environmental, “Ceramic Air Grid
Nozzle for FCCU | Non-
Abrasive Ceramic Nozzles,”
RUICHANG
,
Aug.
24,
2022.
Available:
https://burnertec.com/fcc-equipments/rt-special-
compound-ceramic-wear-nozzle/
[14]
Villa, P. Gianchandani, and F. Baino,
“Sustainable
Approaches
for
the
Additive
Manufacturing of Ceramic Materials,”
Ceramics
, vol.
7, no. 1, pp. 291
–
309, Feb. 2024, doi:
10.3390/ceramics7010019. Faes, M., et al.
[15]
M. Mani, K. W. Lyons, and S. K. Gupta,
“Sustainability
Characterization
for
Additive
Manufacturing,”
J. RES. NATL. INST. STAN.
, vol. 119,
p. 419, Oct. 2014, doi: 10.6028/jres.119.016.
[16]
K. Pandey and R. Prakash, “Opportunities for
sustainability improvement in aluminum industry,”
Engineering Reports
, vol. 2, no. 5, p. e12160, May
2020, doi: 10.1002/eng2.12160.
[17]
Zahide Bayer Ozturk, Ugur Cengiz, Elif Ubay,
Yusuf Karaca, and Semra Kurama, “Utilizing waste
zirconia nozzles for eco-friendly ceramic tile
production,”
Journal of Ceramic Processing
Research
, vol. 26, no. 1, pp. 43
–
50, Feb. 2025, doi:
The American Journal of Engineering and Technology
127
https://www.theamericanjournals.com/index.php/tajet
[18]
Al Rashid and M. Koç, “Additive manufacturing
for sustainability and circular economy: needs,
challenges, and opportunities for 3D printing of
recycled polymeric waste,”
Materials Today
Sustainability
, vol. 24, p. 100529, Dec. 2023, doi:
[19]
K. Pandey and R. Prakash, “Opportunities for
sustainability improvement in aluminum industry,”
Engineering Reports
, vol. 2, no. 5, p. e12160, May
2020, doi: 10.1002/eng2.12160.
[20]
M. Rai, “Life cycle Assessment Stages: the four
stages of LCA,” Carbon Trail, Nov. 29, 2024.
Available:
https://carbontrail.net/blog/life-cycle-
assessment-stages-the-four-stages-of-lca/
[21]
J. M. Gomes, A. L. F. Salgado, and D. Hotza, “Life
Cycle Assessment of Ceramic Bricks,”
MSF
, vol. 727
–
728, pp. 815
–
820, Aug. 2012, doi:
[22]
“Understanding
LCA
Standards:
ISO
14040/14044 | Cove. Tool Help Center.” Available:
https://help.covetool.com/en/articles/8814594-
understanding-lca-standards-iso-14040-14044
[23]
S. Kokare, J. P. Oliveira, and R. Godina, “Life
cycle assessment of additive manufacturing
processes: A review,”
Journal of Manufacturing
Systems
, vol. 68, pp. 536
–
559, Jun. 2023, doi:
[24]
O. Ulkir, “Energy
-Consumption-Based Life Cycle
Assessment of Additive-Manufactured Product with
Different Types of Materials,”
Polymers
, vol. 15, no.
6,
p.
1466,
Mar.
2023,
doi:
[25]
R. Godina, I. Ribeiro, F. Matos, B. T. Ferreira, H.
Carvalho, and P. Peças, “Impact Assessment of
Additive Manufacturing on Sustainable Business
Models in Industry 4.0 Context,”
Sustainability
, vol.
12, no. 17, p. 7066, Aug. 2020, doi:
10.3390/su12177066.
[26]
M. P. Desole, L. Fedele, A. Gisario, and M.
Barletta, “Life Cycle Assessment (LCA) of ceramic
sanitaryware: focus on the production process and
analysis of scenario,”
Int. J. Environ. Sci. Technol.
,
vol. 21, no. 2, pp. 1649
–
1670, Jan. 2024, doi:
[27]
S.-S. Lee and T.-
W. Hong, “Life Cycle Assessment
for Proton Conducting Ceramics Synthesized by the
Sol-
Gel Process,”
Materials
, vol. 7, no. 9, pp. 6677
–
6685, Sep. 2014, doi: 10.3390/ma7096677.
[28]
Info, “Life Cycle Assessment: A Comprehensive
Approach Aligned with ISO 14040 and ISO 14044,”
Key Sustainability, Nov. 26, 2024. Available:
[29]
J. R. Gouveia
et al.
, “Life Cycle Assessment of a
Circularity
Case
Study
Using
Additive
Manufacturing,”
Sustainability
, vol. 14, no. 15, p.
9557, Aug. 2022, doi: 10.3390/su14159557.
[30]
“Ceramic Additive Manufacturing (LCM 3
-D
printing) explained,” Smartech Online, May 23,
2024.
Available:
https://smartechonline.com/resources/ceramic-
additive-manufacturing/
[31]
J. Deckers, J. Vleugels, and J.-
P. Kruth, “Additive
manufacturing of ceramics: A review,” Journal of
Ceramic Science and Technology, vol. 5, no. 4, pp.
245
–
260, Dec. 2014, doi: 10.4416/jcst2014-00032
[32]
O. Kerbrat, F. L. Bourhis, P. Mognol, and J. Y.
Hascoët, “Environmental performance modelling
for
additive
manufacturing
processes,”
International
Journal
of
Rapid
Manufacturing
, vol. 5, no. 3/4, Jan. 2015,
doi: 10.1504/ijrapidm.2015.074812
[33]
C. Cimpan
and H. Sauer, “Advantages of additive
manufacturing based on life cycle assessment,” in
Metal Microstructures and Additive Manufacturing,
Technical University of Denmark (DTU), 2024, pp.
133
–
139.
[34]
V. Annibaldi and M. Rotilio, “Energy
consumption consideration of 3D printing,” 2019 II
Workshop on Metrology for Industry 4.0 and IoT,
Jun. 2019, doi: 10.1109/metroi4.2019.8792856
[35]
M. Broca, “A comparative analysis of the
environmental impacts of ceramic plates and
biodegradable plates (made of corn starch) using
the Life Cycle Assessment tool,” Jun. 2008.
Available:
https://sustainability.tufts.edu/wp-
content/uploads/LifeCycleAnalysisPlasticPlatevsCer
amic.pdf
[36]
M. Maniraj and S. M. R. Kumar, “Additive
manufacturing for a circular economy,” in IGI Global
eBooks, 2025, pp. 55
–
78. doi: 10.4018/979-8-3373-
0533-2.ch003
[37]
S. Directory, “What is life cycle assessment for
3D printing? → Question,” Sustainability Directory,
Mar. 20, 2025. Available: https://sustainability-
directory.com/question/what-is-life-cycle-
assessment-for-3d-printing/
[38]
G. Karadimas, Y. A. Yuksek, and K. Salonitis,
“Environmental
Impact
Assessment
of
manufacturing of SIC/SIC composites,” in Lecture
The American Journal of Engineering and Technology
128
https://www.theamericanjournals.com/index.php/tajet
notes in mechanical engineering, 2025, pp. 223
–
231. doi: 10.1007/978-3-031-77429-4_25
[39]
Rojek, D. Mikołajewski, M. Kempiński, K. Galas,
and A. Piszcz, “Emerging applications of machine
learning in 3D printing,” Applied Sciences, vol. 15,
no.
4,
p.
1781,
Feb.
2025,
doi:
10.3390/app15041781
[40]
S. Jung and L. B. Kara, “Is additive manufacturing
an environmentally and economically preferred
alternative for mass production?” Environmental
Science & Technology, vol. 57, no. 16, pp. 6373
–
6386, Apr. 2023, doi: 10.1021/acs.est.2c04927
[41]
J. B. Guinée et al., Handbook on Life cycle
Assessment, Operational Guide to the ISO
Standards. KLUWER ACADEMIC PUBLISHERS, 2002.
Available: http://kluweronline.com
[42]
J. Bare, T. Gloria, and G. Norris, “Development
of the Method and U.S. Normalization Database for
Life Cycle Impact Assessment and Sustainability
Metrics,” Environmental Science & Technology, vol.
40, no. 16, Jul. 2006, doi: 10.1021/es052494b
[43]
K. Pandey and R. Prakash, “Opportunities for
sustainability improvement in aluminum industry,”
Engineering Reports, vol. 2, no. 5, Apr. 2020, doi:
10.1002/eng2.12160
[44]
ZoM, “Sintering Complex 3D
-Printed Ceramics in
minutes,” AZoM, Sep. 13, 2022. Available:
https://www.azom.com/news.aspx?newsID=59993
[45]
FormFutura and FormFutura, “Is recycling the
best solution for 3D printing scraps?” Formfutura,
Jan.
31,
2024.
Available:
https://formfutura.com/blog/reduce-reuse-
recycle/
[46]
S. Directory, “DFAM → Term,” Sustainability
Directory,
Apr.
27,
2025.
Available:
https://sustainability-directory.com/term/dfam/
[47]
Z. Naser and F. Defersha, “Toward Automated
Life Cycle Assessment for Additive Manufacturing: A
Systematic review of influential parameters and
framework design,” Sustainable Production and
Consumption,
vol.
41,
Aug.
2023,
doi:
10.1016/j.spc.2023.08.009
[48]
N. Kuang, M. Xiao, H. Qi, W. Zhao, and J. Wu,
“Optimization of resin composition for zirconia
ceramic
digital
light
processing
additive
manufacturing,” Polymers, vol. 17, no. 6, p. 797,
Mar. 2025, doi: 10.3390/polym17060797
[49]
N. Kuang, M. Xiao, and J. Wu, “Optimization of
resin composition for zirconia ceramic digital light
processing additive manufacturing,” Polymers, vol.
17, no. 6, Mar. 2025, doi: 10.3390/polym17060797
Geeetech, “Additive Manufacturing (3D Print) in
aerospace
|
Geeetech,”
Geeetech.
Available:
