When ceramics are used as a slider material, both the wear resistance of ceramics themselves and no damage to the pair material are required. In high speed sliding, Y
2O
3-doped partially stabilized ZrO
2 adheres to pair materials and protects them, but ZrO
2 wears easily as compared with other ceramics. In this study, using Al
2O
3-ZrO
2 composites, we investigated the optimum condition to improve the wear resistance of ZrO
2 while protecting the pair materials. As results, in the combination with Si
3N
4, the optimum content of Al
2O
3 at which wear decreased to one-hundredths was detected. In this content, ZrO
2 and Al
2O
3 grain dispersed excellently with the grain size in the order of 0.1μm. It was confirmed that the microstructure and density of ceramics affected the wear properties. Furthermore, to consider the mechanism of wear resistance, the sliding surface observed by SEM and optical microscopy. It was estimated that the sliding mechanism differed from that of Al
2O
3 and ZrO
2 ceramics in the ZrO
2-Al
2O
3 composites.
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