Abstract
Abstract In this study, ZrO 2 (Y 2 O 3 )–Al 2 O 3 -graphite composite powder was prepared by a mechanical milling method and a direct powder doping milling method, and sintered in a microwave. Microstructure and tribological properties of the composites were investigated. The results showed that uniformly dispersed fine graphite flakes were obtained using the mechanical milling method. ZrC phase was generated in the composite ceramics. The tribological properties of ZrO 2 (Y 2 O 3 )–Al 2 O 3 - graphite composites prepared by the mechanical milling method were better than those of ZrO 2 (Y 2 O 3 )–Al 2 O 3 -graphite composites prepared by the direct powder doping milling method. The friction coefficient and specific wear rate of ZrO 2 (Y 2 O 3 )–Al 2 O 3 -graphite composites by the mechanical milling method were 0.147 and 6.2 × 10 −6 mm 3 /(N m), respectively. The wear mechanisms of ZrO 2 (Y 2 O 3 ) ceramic matrix composites were discussed.
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