The effects of ultrafine WC content on the microstructure, mechanical properties and wear resistance of regenerated coarse grained WC-10Co cemented carbides have been investigated by SEM, mechanical property tests and wear test. The results show that with the increase of ultrafine WC content, the average grain size of the regenerated cemented carbides increases first and then decreases. When the ultrafine WC content is 10%, the average grain size of the regenerated cemented carbides is the maximum (4.06 μm). Meanwhile, the irregular shape grain decreases and the growth of grain is improved. When the ultrafine WC content is 10%, the regenerated cemented carbides have the highest density (99.84%), which could alleviate the negative impact of coarse grains on hardness. The transverse rupture strength and fracture toughness of regenerated cemented carbides increases on account of crack deflection, crack branching, crack bridging, the increase of transgranular fracture of WC and dimple fracture of Co phase (TRS: 2520 MPa, K_IC: 20.28 MPa·m^1/2). Therefore, when the ultrafine WC content is 10%, the regenerated cemented carbides have more optimal mechanical properties. The addition of ultrafine WC particles balances the hardness and fracture toughness of the regenerated cemented carbides in the sliding wear experiment, which is found that the friction coefficient, wear rate, wear scar width and depth of regenerated cemented carbides are the smallest when the content of ultrafine WC is 15%.

通过SEM，力学性能测试和磨损测试，研究了超细WC含量对再生粗晶粒WC-10Co硬质合金组织，力学性能和耐磨性的影响。结果表明，随着超细碳化钨含量的增加，再生硬质合金的平均晶粒尺寸先增大然后减小。当超细WC含量为10％时，再生硬质合金的平均晶粒尺寸最大（4.06μm）。同时，不规则形状的晶粒减少并且晶粒的生长得到改善。当超细碳化钨含量为10％时，再生硬质合金的密度最高（99.84％），这可以减轻粗晶粒对硬度的负面影响。_IC：20.28MPa·m ^1/2。因此，当超细WC含量为10％时，再生硬质合金具有更好的机械性能。碳化钨超细颗粒的添加在滑动磨损实验中平衡了再生硬质合金的硬度和断裂韧性，发现当硬质合金含量为时，摩擦系数，磨损率，磨损痕迹宽度和再生硬质合金的深度最小。超细WC为15％。