Abstract
The disadvantage of antifriction Al–Sn alloys with high tin content is their low bearing capacity. To improve this property, the aluminum matrix of the alloys was alloyed with zinc. The powder of Al–10Zn alloy was blended with the powder of pure tin in the proportion of 40/60 (wt.%). The resulting mixture of the powders was compacted in briquettes and sintered in a vacuum furnace. The sintered briquettes were subjected to subsequent pressing in the closed press mold at an elevated temperature. After this processing, the yield strength of the sintered (Al–10Zn)–40Sn composite was 1.6 times higher than that of the two-phase Al–40Sn one. The tribological tests of the composites were carried out according to the pin-on-disk scheme without lubrication at pressures of 1–5 MPa. It was established that the (Al–10Zn)–40Sn composite has higher wear resistance compared with the Al–40Sn one. However, this advantage becomes insignificant with an increase in the pressure. It was found that the main wear mechanism of the investigated composites under the dry friction process is a delamination of their highly deformed matrix grains.
Highlights
Increasing the service life of friction units in machines and mechanisms is one of the most important problems of modern materials science and engineering [1,2,3]
The strength of the Al–Sn alloys should be increased by alloying of the alloys with hard particles or some materials that form a solid solution with Al [10,11,12]
The structure of sintered (Al–10Zn)–40Sn and Al–40Sn composite material (CM) consists of an Al matrix with uniformly distributed tin inclusions (Figure 4)
Summary
Increasing the service life of friction units in machines and mechanisms is one of the most important problems of modern materials science and engineering [1,2,3]. Such multilayer inserts should be replaced by monometallic ones if it is possible For this purpose, the strength of the Al–Sn alloys should be increased by alloying of the alloys with hard particles or some materials that form a solid solution with Al [10,11,12]. It is necessary to avoid dissolution of these strengthening additives in Sn inclusions in order to maintain a high level of ductility and lubricating ability of the soft phase. For this reason, the list of the additives is limited [13,14]
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