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为提高钛合金的摩擦学性能,以金属陶瓷Ni60和固体润滑剂h-BN复合合金粉末为原料,采用激光熔覆技术在钛合金表面制备出了以硬质Ti C、Ti B2、Cr B等为耐磨增强相、以h-BN为固体润滑相的自润滑耐磨复合涂层.采用X射线衍射(XRD)、扫描电镜(SEM)和能谱仪(EDS)分析了涂层的显微组织结构及物相;在室温条件下分别在不同载荷(2、5和8 N)下以Si3N4陶瓷球为对偶件测试了复合涂层与基体的干滑动磨损性能,并分析了其磨损机理.结果表明:复合涂层的平均硬度为HV0.21 013.75,约是基体(HV0.2360)的3倍,在所有试验载荷下,复合涂层的摩擦系数和磨损率均比基体的低.随着载荷的增加,涂层的摩擦系数和磨损率均先减小后升高,说明涂层在5 N载荷下显示出最好的自润滑和耐磨性能.
In order to improve the tribological properties of titanium alloy, the hard metal TiC, TiB2, CrB, etc. were prepared on the surface of titanium alloy by using the laser cladding technology with the cermet Ni60 and the solid lubricant h-BN composite alloy powder as raw materials Wear-resistant reinforced phase and h-BN as solid lubricating phase.The microstructures of coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) The microstructure and phase of the composite coating were investigated at room temperature with Si3N4 ceramic balls under different loads (2, 5 and 8 N) respectively. The wear mechanism was also analyzed. The results show that the average hardness of the composite coating is HV0.21 013.75, which is about 3 times higher than that of the HV0.2360, and the friction coefficient and wear rate of the composite coating are lower than those of the matrix under all experimental loads The increase of the load, the friction coefficient and the wear rate of the coating both decrease and then increase, indicating that the coating shows the best self-lubrication and wear resistance under 5 N load.