Résumé

In this work was prepared a-Al2O3 alloys from laboratory aluminum oxide powder that
was milled for different periods of time and sintered at a temperature of 1450 C. The difference
between the prepared samples was studied using several experimental measurement techniques,
including X-ray diffraction, scanning electron microscopy and measurement of physical and
mechanical properties. Moreover, the effect of milling time on the formation and sintering of
alpha-alumina, by milling the mixture at different times using high energy crushing technique
was studied. An influence of milling time on density, open spaces and microstructure of the samples
was analyzed. The obtained results showed that longer milling duration led to alloys with higher
hardness (H) and modulus of elasticity (E). This improvement is due to lower porosity and corresponding
higher density at high temperatures. A noticeable decrease in the size of the particles with
the increase of the milling time led to an increase in the lattice parameter accompanied by a decrease
in defects and ionic voids. The percentage of pores reached 0.04 % within 24 h of grinding after it
was approximately 0.20 %, while the density reached 96 % after the same highest grinding time.
Tests showed that the value of friction coefficient decreases, while it increases with the increase
in the applied pressure force and this was confirmed by SEM images of the samples. the main factor
to reduce friction is the increase in grinding time, regardless of the value of the applied load. The
results showed that the Al2O3 alloy applied to it with a load of 2 N and milled for 24 h had a minimum
value of 1.94 mm3 wear volumes and a wear rate of 1.33 (mm3∙N
1∙mm
1). The sample milled
for 24 h showed the best result, characterized by the lowest wear size, specific wear rate and the
highest hardness with extraordinary density of 96 %, which is important in the field of biomaterials
applications.

Information

Item Type:	Journal
Divisions:
ePrint ID:	4409
Date Deposited:	2023-09-13
Further Information:	Google Scholar
URI:	https://www.univ-soukahras.dz/fr/publication/article/4409

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