火焰喷涂重熔Ni基WC复合涂层的耐磨性能试验研究

利用火焰喷涂重熔方法制备了Ni基WC复合涂层，并进行了耐磨性能试验研究.通过扫描电子显微镜观察涂层磨损后的表面形貌，分析了WC体积分数、颗粒分布均匀性、包裹粉颗粒尺寸对涂层耐磨性的影响.结果表明:涂层硬度和耐磨性随着WC体积分数增加而提高，当WC体积分数过高时，降低了涂层致密性，其硬度和耐磨性反而有所下降；聚乙二醇(PEG)400+PEG2000+无水乙醇混粉方式的WC颗粒分布最均匀，降低了涂层磨损量；加入相同体积分数的亚微米级WC所制备的涂层耐磨性较微米级WC所制备的涂层耐磨性好.关键词：火焰喷涂显微组织颗粒尺寸耐磨性能

Experimental study of wear resistance of nickel based WC composite coating prepared by flame spraying and remelting

Nickel based WC composite coating was prepared by the method of flame spraying and remelting, and its wear resistance was researched. The surface morphology of the coating after wear test was observed with scanning electric microscope, and the effects of WC volume fraction, the homogeneity of grain distribution, and the size of the packed powder grain on the wear were analyzed. The results showed that the hardness and wear resistance of the coating improve with WC volume fraction increasing, but the coating density lowers when WC volume fraction is too high, and the hardness and wear resistance decrease as a reaults. The distribution of WC grain with the blending method of polyethylene glycol (PEG) 400+ PEG2000+ethanol is most even, which decreases the degree of wear. Wear resistance of coating containing the same volume fraction of sub-micron WC powders is better than that of WC powders of micron size.