采用真空烧结脱脂和热等静压工艺制备了ZrO2(3Y)含量不同的WC-20%Co复合材料,用X射线衍射仪定量分析计算摩擦磨损试验前后由四方结构(t)向单斜结构(m)转变(t→m)的相变量,在MM-200型摩擦磨损试验机上评价其耐磨性。利用扫描电子显微镜观察分析了试样的磨损表面形貌,并分析了磨损特性及机制。结果表明:在WC-20%Co中添加适量ZrO2(3Y)可以提高其耐磨性,其中ZrO2含量为4%～5%时,其耐磨性最佳,这是由于其表面摩擦压应力作用诱发t→m相变的结果。 WC-20% Co composites with different contents of ZrO2 (3Y) were prepared by vacuum sintering degreasing and hot isostatic pressing. Quantitative analysis of the WC-20% Co with tetragonal structure (t) m) transformation (t → m) of the phase change, in the MM-200 type friction and wear testing machine to evaluate the wear resistance. The wear surface morphology of the samples was analyzed by scanning electron microscopy, and the wear characteristics and mechanism were analyzed. The results show that adding ZrO2 (3Y) to WC-20% Co can improve the wear resistance of the WC-20% Co. The wear resistance of Zr-ZrO2 is best when the content of ZrO2 is 4% ~ 5% Induced t → m phase transition results.