Dry sliding tribological characteristics of particle-reinforced aluminum composites against semi-metallic frictional material

摘要

The dry sliding tribological characteristics were investigated on self-made block-disk tester using ceramics (SiCp, Al2O3) particle-reinforced aluminum composites against semi-metallic frictional materials. The experimetnal results indicate that tribological properties of SiCp reinforced aluminum composites are superior to that of Al_2O_3 reinforced composites. The increase in SiCp particle size or volume fraction makes the increase in wear resistnace and the decrease in frictional coefficient. On the other hand, the increases in silicon content of matrix aluminum alloys caused the wear resistance of composites to increase and frictional coefficient to decrease. The wear rates of SiCp particle reinforced composites are much less (about ninth of gray cast iron) than that of gray cast iron which are commonly used to make brake disk, while which frictional coefficient is about the same. Based on the experiemtnal results, the authors suggest that particle-reinforced composite be one of hte suitable materials for making vehicle-braking components.