采用微尺度浆料磨料磨损试验机和钢轮湿磨料磨损试验机 ,对比考察了不同晶粒尺寸和硬度的 WC/ Co硬质合金在钢轮湿磨料磨损试验和微尺度浆料磨料磨损试验条件下的磨料磨损性能 ;同时采用扫描电子显微镜观察分析合金磨损表面形貌 ,以探讨其磨损机理 .结果表明 :随着硬质合金试样硬度的增加 ,其在钢轮湿磨料磨损试验条件下的抗磨能力明显增强 ;而在微尺度浆料磨料磨损试验条件下 ,即 WC晶粒粒度与磨料相对尺寸相近时 ,合金的磨损体积损失与其硬度之间无明显相关性 ,此时 WC晶粒尺寸是影响硬质合金磨料磨损性能的主要因素 ,WC/ Co硬质合金的主要磨损机理为 WC晶粒的断裂和剥落 Using micro-scale slurry abrasive wear tester and steel wet abrasive wear tester, the WC / Co cemented carbide with different grain size and hardness was compared in the wet-wear test of steel wheel and microscale abrasive wear test conditions Under the condition of wet abrasive wear test of steel wheel, the wear behavior of the alloy was studied by scanning electron microscope (SEM) The wear resistance of the alloy is obviously enhanced. However, there is no significant correlation between the wear volume loss and the hardness of the alloy when the WC grain size is similar to the relative size of the abrasive in the microscale slurry abrasive wear test condition. At this time, the WC grain size Is the main factor affecting the wear performance of cemented carbide abrasives. The main wear mechanism of WC / Co cemented carbide is the fracture and spalling of WC grains