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为提高Ti-6Al-4V钛合金的摩擦学性能,以金属陶瓷NiCr-Cr3C2和自润滑颗粒WS2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TiC和TiWC2为耐磨增强相、Ti2CS和CrS金属硫化物为自润滑相的高温自润滑耐磨复合涂层。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相及显微组织结构;分别在室温、300℃和600℃时利用Si3N4陶瓷球对磨来测试涂层和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1005HV0.2,约为基体(360HV0.2)的3倍,从室温到600℃,由于增强相TiC、TiWC2和自润滑相CrS、Ti2CS的综合效应,复合涂层的摩擦系数和磨损率相比基体均显著降低,具有良好的高温自润滑耐磨性能。
In order to improve the tribological properties of Ti-6Al-4V titanium alloy, the cermet NiCr-Cr3C2 and self-lubricating particles WS2 composite alloy powder were used as raw materials, and the surface of the titanium alloy was prepared by laser cladding technology with the hard TiC and TiWC2 as Wear enhanced phase, Ti2CS and CrS metal sulfide as a self-lubricating phase of high temperature self-lubricating wear-resistant composite coating. The phase and microstructure of the coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Si3N4 ceramic balls were used at room temperature, 300 ℃ and 600 ℃ Mill to test the dry sliding wear properties of the coating and matrix, and analyzed its wear mechanism. The results show that the average hardness of the composite coating is 1005HV0.2, which is about three times that of the matrix (360HV0.2). From room temperature to 600 ℃, due to the combined effects of TiC, TiWC2 and self-lubricating phases CrS and Ti2CS, The friction coefficient and wear rate of the coating are significantly lower than the matrix, with good high temperature self-lubricating wear resistance.