Tribological Behavior of Unlubricated Sliding Test with Sialon, Al_2O_3 and SiC

Friction and wear behaviors were studied for Sialon, Al2O3 and SiC unlubricated sliding against themselves with block-ring apparatus at 5ON normal load and 0.9m/s sliding velocity. All materich and worn surfaces as well as debris were extensively characterized by means of SEM, TEM and XPS. The results obtained indicated that: Wear of Sialon is interpreted in terms of delamination. In the processing, the oxidation and its formation appeared. Mixed surface film of SiO2 and Al2O3 improved the wear of Sialon. Wear of Al2O3 is explained in terms of the grain fracture. Wear of SiC is caused by the formation of powders and loose wear debris which was due to the oxidation of SiC.