论文部分内容阅读
为了提高钛合金的摩擦学性能,采用激光熔覆技术在Ti-6Al-4V合金基体表面制备了以“原位”生成TiB2、CrB、TiC等为增强相、γ-Ni基固溶体为增韧相及h-BN为润滑相的γ-Ni基高温自润滑复合涂层。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相和显微组织,在球-盘式高温摩擦磨损试验机上测试了不同温度下(室温、300、600℃)复合涂层的摩擦学性能。结果表明:激光熔覆制备的复合涂层与基体呈冶金结合,该复合涂层的摩擦系数和磨损率都远低于Ti-6Al-4V基体;在高温600℃时,复合涂层的磨损率和平均摩擦系数为5.13×10-5 mm3/Nm和0.184,相对于钛合金基体分别降低了81.8%、38%,表现出良好的高温自润滑耐磨性能。
In order to improve the tribological properties of titanium alloys, TiB2, CrB, TiC and so on were prepared on the surface of Ti-6Al-4V alloy by using laser cladding technology as reinforcing phase and γ-Ni-based solid solution as Tough phase and h-BN as the lubricating phase of γ-Ni-based high-temperature self-lubricating composite coating. The phase and microstructure of the coating were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The microstructure of the coating was tested at different temperatures Room temperature, 300,600 ℃) composite coating tribological properties. The results show that the composite coating prepared by laser cladding is metallurgically bonded to the substrate. The friction coefficient and wear rate of the composite coating are much lower than that of Ti-6Al-4V substrate. At 600 ℃, the wear rate And the average friction coefficient of 5.13 × 10-5 mm3 / Nm and 0.184, respectively, relative to the titanium alloy substrate decreased by 81.8%, 38%, showing good high temperature self-lubricating wear resistance.