Volume 03 Issue 11-2023
226
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
ABSTRACT
The article shows the method of preparation of research samples based on aluminum powder and particle size of raw
powder, as well as the effect of heating temperature on the mechanical properties of samples on the basis of
experimental results. The results of research on the preparation of a mixture based on aluminum powder, the heating
of briquettes prepared for research from the obtained powder mixtures in a vacuum furnace and the study of the
mechanical properties of the prepared samples are presented.
KEYWORDS
aluminum powder, powder mixture, powder particle, press mold, press briquette, research sample, vacuum furnace,
heating, mechanical properties of the sample.
INTRODUCTION
The technological process of production of structural
parts is determined by how the part works under the
influence of loads. As the loading rate on a part
increases, its production technology becomes more
complex, for example, small-loaded parts are
subjected to one-way pressing and heating, while
medium- and heavy-duty parts are subjected to double-
pressing and hot-pressing or simultaneous pressing.
undergoes a heating process [1].
Research Article
PREPARATION OF ALUMINUM POWDER BASIC RESEARCH SAMPLES
AND EFFECT OF POWDER PARTICLE SIZE AND COOKING TEMPERATURE
ON THE MECHANICAL PROPERTIES OF SAMPLES
Submission Date:
November 20, 2023,
Accepted Date:
November 25, 2023,
Published Date:
November 30, 2023
Crossref doi:
https://doi.org/10.37547/ajsshr/Volume03Issue11-24
Jasurbek Usmonov
Doctor Philosophy (Phd), Andijan Economics And Construction Institute, Uzbekistan
Journal
Website:
https://theusajournals.
com/index.php/ajsshr
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 03 Issue 11-2023
227
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
In the manufacture of aluminum powder-based parts,
first a powder mixture (slag) with the required
composition is prepared, then the slag is made of sheet
metal with the required shape and size by means of
press molds, and then the sheet is processed by hot
baking [2].
In order to achieve high physical and mechanical
properties in the production of structural parts based
on aluminum powder, aluminum powder can be added
to various other powder components in the amount of
0.1 .... 10%. In this case, the quality of mixing the
powders with each other depends on the method of
mixing, speed and duration [1].
Methods
According to the analysis of the literature on methods
and technologies of powder mixing, when mixing
aluminum powder obtained in a ball mill with powders
of other metals, the addition of "white" alcohol (GOST
1204-95) in the amount of 1 ... 1.5% by weight of the
powder especially with Cu, Zn, Sr and Ni powders. The
technological procedure developed by us for mixing
powder components based on the analysis of the
literature on the technology of production of
aluminum powder-based parts and the equipment
selected for its implementation are given in Table 1.
Table 1
Technological procedure for mixing powder components in a humid environment
Device name
Mass of
powder, kg
Alcohol
content, l
Rotation
speed, rpm
Mixing time,
hours
Ambient
temperature,
o
S
Drunk barrel
mixer
25
1
50
6
22
After confirming the complete mixing of the components in the charge, in order to expel the "white" alcohol from it,
we dried the charge in a hermetically sealed cabinet at a temperature of 50 ... 70oS.
From the mixture of aluminum slag powder we obtained blanks with the required shape and size for research, by
pressing at different pressures using the P-250 model hydropress in press molds for each shape and size. We used the
following formula to determine the amount of powder mixture in the press mold [3]:
2
1
)
100
1
(
К
К
П
c
Vd
М
−
=
(1)
Volume 03 Issue 11-2023
228
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
in this, V
–
the size of the sample blank, sm3;
dC
–
zagatovka density, g/sm2;
П –
the planned porosity in the sample, %;
К1 –
coefficient-
factor, which takes into account the reduction of powder in the formation, for aluminum powder (К1
= 1,1);
К2 –
a coefficient that t
akes into account the reduction of powder in baking, for aluminum (К2 = 1,15).
Preparation of blanks of research samples from slag
powder was carried out by double-pressing methods.
Samples of the prepared research are shown in Figure
1.
In order to prevent the aluminum powder from sticking
to the surface of the mold parts (sternum and die)
during the pressing process of the ingot, before
pressing the ingot, we applied a special emulsion oil
"Elitol E13M1" to the surface of the press die, punch
and stem. As a result, the problem of sticking
aluminum powder to the surface of the mold is
eliminated.
The process of heating is the final technological stage,
in which the press blank, consisting of individual
different powder particles, turns into a whole solid
with complete physical and mechanical properties [4].
The process of heating aluminum powder-based press
blanks consists of heating, keeping at this temperature
and cooling to room temperature from 5400 S to
6400S, depending on the chemical composition of the
blanks [3, 5].
1 - rectangular cut; 2 - circle cut; 3 - cylindrical.
Volume 03 Issue 11-2023
229
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
Figure 1. Press blanks of aluminum powder based research samples.
In order to qualitatively carry out the process of baking aluminum powder-based materials, the slag mixture contains
1 ... 3% of NaCl, NaF or ZnCl2. These substances dissolve Al2O3-oxide membranes on the surface of aluminum powder
particles during the heating process of pressed blanks [6,7].
We used a laboratory furnace operating in a vacuum or gaseous environment with an operating temperature of 800
0S to carry out the process of heating and baking aluminum powder-based press blanks. The location of the furnace
and sample blanks in it is shown in Figure 2.
a - vacuum oven; b - Place the samples in the oven chamber.
Figure 2. Preheat oven.
In order to ensure the quality of the heating process, we added 3% ZnCl2 to the slag, the mass of the slag. During the
heating process, it reacts chemically with the oxide film on the surface of the aluminum particle as follows:
Al
2
O
3
+ ZnCl = Zn + AlCl
2
(2)
Volume 03 Issue 11-2023
230
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
The products of Zn and AlCl2 formed as a result of
chemical (2) reaction are in the vapor state and are
absorbed into the aluminum base [8].
RESULTS AND DISCUSSION
Determination of the effect of the particle size of the
raw powder and the heating temperature on the
mechanical properties of the samples. In order to
determine the dAl-particle size of aluminum powder
used as a raw material and the effect of heating
temperature on the mechanical properties of the
sample, we prepared research samples based on
aluminum powder with a cross section of 6.5x5.2 mm
and a length of 35 mm. Table 2 shows the particle size
of powder dAl in the preparation of samples and the
technological
parameters
determined
in
the
preparation of samples from them.
Table 2
Defined technological parameters for the preparation of samples
№
d
Al
,
mk
m
Al
2
O
3
,
%
ZnCl
2
,
%
Р,
t/sm
2
Heating cooking process
temperature,
0
S
time,
minutes
environ
ment
1
10
3,5
3
3
560 580
610
620
60
High
vacuum
1,33·10
-
4
Pа
2
30
560 580
610
620
3
50
560 580
610
620
4
70
560 580
610
620
We determined the mechanical properties of the
material samples obtained on the basis of aluminum
powder in the order of experimental research. The raw
material used dAl - the limit of compressive strength,
relative elongation, impact viscosity and hardness of
the samples depending on the particle size is shown
graphically in Figure 3.
According to the experimental results obtained, the
bending strength of the samples varied depending on
the particle size of the raw powder dAl - and the
heating temperature of the heating. The powder used
in the preparation of the sample dAl - a decrease in
particle size and an increase in the heating
temperature from 560 0S to 610 0S had a positive
effect on the bending strength of the samples (Fig. 3,
a, 1, 2, 3). However, an increase in temperature from
610 0S to 620 0S resulted in a decrease in strength (3, a
- Fig. 4). Test results on the samples show that the
mechanical properties of the samples are fully
Volume 03 Issue 11-2023
231
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
consistent with the theory of strength and plasticity of
metals and alloys.
In our opinion, the decrease in the strength of the
samples as a result of raising the heating temperature
of samples made of powder with a particle size of 10
microns dAl to 620 0S was due to the enlargement of
the powder with a particle size of 10 microns. The
larger the particle size of the raw powder dAl - particle,
the greater the effect of temperature on the particle
size.
a-is the limit of bending strength; b-is the relative elongation; v - hardness;
g - impact viscosity (1 - 560 0S; 2 - 580 0S; 3 - 610 0S; 4 - 620 0S).
Volume 03 Issue 11-2023
232
American Journal Of Social Sciences And Humanity Research
(ISSN
–
2771-2141)
VOLUME
03
ISSUE
11
P
AGES
:
226-232
SJIF
I
MPACT
FACTOR
(2021:
5.
993
)
(2022:
6.
015
)
(2023:
7.
164
)
OCLC
–
1121105677
Publisher:
Oscar Publishing Services
Servi
Figure 3. Raw material powder dAl - change in particle size and mechanical properties of samples by heating
cooking temperature.
CONCLUSION
As a result of the analysis, we came to the following
conclusions: in order to achieve high mechanical
properties, it is necessary to choose aluminum powder
with a particle size of 10 μm or less as a raw material,
with a heating temperature of 610 0S and holding time
at this temperature for 60 minutes. Increasing the
firing temperature of aluminum powder-based
samples by vacuum to 620 0S leads to an increase in
the bending strength of the powder and a decrease in
the bending strength of the sample from 150 mPa to
120 mPa, but an increase in plasticity properties.
REFERENCES
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Гопиенко В.Г., Смагоринский М.Е., Григорьев
А.А. Спеченные материалы из алюминиевых
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М.: Металлургия, 2013. –
320 с.
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Гиршов В.Л., Котов С.А., Цеменко В.Н.
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Ласковнёв А.П. Композиционные материалы
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Usmonov J.М., Shakirov Sh.М., Ubaydullayev
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