DENG Jianxin, AI Xing, DING Zeliang

(Shandong University of Technology)

Abstract: Effect of whisker orientation on the wear resistance of Al₂O₃／TiB₂/SiC_w ceramic composite against cemented car­bide(YGS)both in air or in N₂ atmosphere at temperatures ranging from 200℃ to 800℃ has been studied. The wear rate were examined. Results showed that substantial improvement in wear resistance can be obtained when sliding in N₂ atmosphere at high temperature. The mechanism responsible for the improvement was determined to be the pre­vention of oxidation of SiC whiskers. The wear resistance of this composite decreased with decreasing e when sliding in air atmosphere at high temperature, this was found to be caused by the oxidation of SiC whiskers and whisker pullout.

Keywords: SiC whisker, TiB₂, ceramic composite, friction and wear, high temperature