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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.
The Ni-based WC composite coating was prepared by flame spraying and remelting method, and the wear resistance of the composite coating was studied. The surface morphology of the coating after wear was observed by scanning electron microscopy. The WC volume fraction, particle distribution uniformity, The results show that the hardness and wear resistance of the coating increase with the increase of the volume fraction of WC, while when the volume fraction of WC is too high, the densification of the coating is reduced. The hardness and wear resistance But the grinding performance decreased. The distribution of WC particles in PEG400 + PEG2000 + ethanol mixture was the most uniform, which reduced the coating wear. The addition of submicron WC with the same volume fraction The wear resistance of the layer is better than that of the coating prepared by the micron-scale WC.