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利用激光熔覆技术在在0Cr18Ni9奥氏体不锈钢表面制备了Ni Cr/Cr_3C_2-MoS_2-BaF_2复合材料耐磨自润滑涂层,采用X衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了熔覆层的物相组成及显微组织,采用显微硬度计测试了涂层沿层深方向的显微硬度分布,并在室温环境下对涂层进行干滑动摩擦磨损试验。结果表明:涂层主要由γ-(Ni,Fe)共晶化合物、碳化物硬质Cr_7C_3、CrS以及少量的Mo S2润滑相和少量BaF_2组成,熔覆层的显微硬度平均值约为783 HV0.2,是基体的2.44倍,熔覆层总体摩擦因数和磨损率明显低于基体,磨损率约为基体的1/5。磨损过程中产生的润滑氧化膜有利于提高其耐磨损性能。
The Ni Cr / Cr 3 Cr 2 MoS 2 -BFF 2 composite wear-resistant and self-lubricating coating was prepared by laser cladding on the surface of 0Cr18Ni9 austenitic stainless steel. The wear-resistance and self-lubricating coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) (EDS) was used to analyze the phase composition and microstructure of the coating. The microhardness distribution along the depth of the coating was measured by microhardness tester. The dry sliding friction and wear test of the coating at room temperature . The results show that the coating mainly consists of γ- (Ni, Fe) eutectic compound, carbide hard Cr_7C_3, CrS, a small amount of Mo S2 lubricating phase and a small amount of BaF_2. The average microhardness of the coating is about 783 HV0 .2, which is 2.44 times that of the matrix, the overall friction coefficient and wear rate of the cladding layer is significantly lower than that of the matrix, and the wear rate is about 1/5 of that of the matrix. Lubricating the oxide film produced during wear helps to improve its wear resistance.