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通过在镍基合金中添加MoS2固体自润滑相,利用激光熔覆技术在20CrMo钢基材表面制备MoS2/Ni基复合涂层,获得与基体冶金结合且无气孔、裂纹等缺陷的熔覆层。使用光学显微镜、扫描电镜(SEM)、能谱仪(EDS)对激光熔覆层组织、成分进行表征,用MMG-10型高温高速摩擦磨损试验机对MoS2/Ni基涂层的摩擦性能进行测试。研究结果表明,在试验温度20~800℃范围内,复合自润滑涂层的摩擦系数比Ni基合金涂层显著降低,随MoS2含量增加,摩擦系数呈降低趋势;在MoS2同含量的复合材料中,其摩擦系数随试验温度升高呈先降后升的趋势,含8%MoS2复合自润滑涂层的摩擦系数,在600℃时达到最小值0.2。
By adding MoS2 solid self-lubricating phase to the Ni-based alloy, the MoS2 / Ni-based composite coating was prepared on the surface of the 20CrMo steel by laser cladding technology to obtain a cladding layer metallurgically bonded with the substrate without defects such as pores and cracks. The microstructure and composition of laser cladding layer were characterized by optical microscope, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The tribological properties of MoS2 / Ni-based coating were tested by MMG-10 high temperature and high speed friction and wear tester . The results show that the friction coefficient of the composite self-lubricating coating decreases significantly compared with the Ni-based alloy coating at the temperature range of 20 ~ 800 ℃. The friction coefficient decreases with the increase of MoS2 content. In the composite with the same content of MoS2 , The coefficient of friction first and then increase with the increase of the test temperature, and the coefficient of friction of 8% MoS2 composite self-lubricating coating reaches the minimum of 0.2 at 600 ℃.