利用激光熔覆技术在0Cr18Ni9不锈钢基体上制备NiCr/Cr3C2耐磨涂层与NiCr/Cr3 C2-30％ WS2耐磨自润滑涂层,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相组成及显微组织.在室温、300℃和600℃下分别测试了上述涂层的干滑动摩擦学性能,并讨论其磨损机理.实验结果表明:添加WS2的熔覆涂层主要有Cr7C3、(Cr,W)C碳化物增强相、r(Fe,Ni)/Cr7C3共晶增韧相、WS2及CrS润滑相.两种涂层都随温度的升高,摩擦因数降低,而磨损率增大.在室温及300℃时,添加WS2涂层由于润滑相的作用拥有较好的减摩耐磨性能.在600℃时,由于涂层中碳化物硬质相的强度降低,两种涂层的磨损率显著增大.
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