喷射成形Al22Si5Fe3Cu1Mg的高温耐磨机制

The effects of temperature on friction behavior and wear mechanism for high-silicon aluminum alloy were systematically studied by comparing two processes of conventional cast and spray-formed for manufacturing Al22Si5Fe3Cu1Mg alloy. The result shows that Al22Si5Fe3Cu1Mg alloy by spray-form process shows better abrasion and wear properties than that by conventional casting. The wear mechanism changes with temperature, which shows mixed wear of abrasive and adhesive at temperature lower than the critical temperature and shows delamination wear at temperature higher than the critical temperature. When explored at high temperature, the formation of oxidation improves the wear resistance for the Al22Si5Fe3Cu1Mg alloy due to the fast oxidation and there exiting a critical temperature when wear increases significantly. The wear mechanism of two materials changes into delamination wear with wear rate increasing dramatically by low wear. Notably, the Al22Si5Fe3Cu1Mg alloy by spray-formed process shows superior wear resistance than that from conventional cast both at high and low temperatures. Moreover, the Al22Si5Fe3Cu1Mg alloy by spray-formed process has higher critical temperature of wear mechanism than that by conventional cast.