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为提高Ti6Al4V合金的摩擦学性能,采用激光熔覆技术在Ti6Al4V表面制备出以TiC为增强相、γ-NiCrAlTi固溶体为增韧相、CaF2为自润滑相的γ-NiCrAlTi/TiC/CaF2自润滑耐磨复合涂层。分别在轻载(2、3N)、中等载荷(5、6N)和重载(11、12N)时测试了复合涂层和Ti6Al4V合金基体的干滑动磨损性能。结果表明该复合涂层的摩擦系数及磨损率都随着载荷的增大呈现先减小后略增大的趋势;在中等载荷(5N)下,磨损表面光滑平整,涂层中的润滑颗粒被挤压出磨损表面形成润滑膜,γ-NiCrAlTi/TiC/CaF2润滑耐磨复合涂层的摩擦系数和磨损率均比Ti6Al4V合金基体显著降低,该复合涂层在中等载荷(5N)具有较好的自润滑耐磨性能。
In order to improve the tribological properties of Ti6Al4V alloy, the γ-NiCrAlTi / TiC / CaF2 self-lubricating coatings with TiC as reinforcing phase, γ-NiCrAlTi as toughening phase and CaF2 as self-lubricating phase were prepared by laser cladding on the surface of Ti6Al4V Grinding composite coating. The dry sliding wear properties of composite coatings and Ti6Al4V alloy substrates were tested at light loads (2,3N), medium loads (5,6N) and heavy loads (11,12N) respectively. The results show that the friction coefficient and the wear rate of the composite coating decrease first and then increase slightly with the increase of the load. At the medium load (5N), the wear surface is smooth and the lubricating particles in the coating are The friction coefficient and the wear rate of γ-NiCrAlTi / TiC / CaF2 lubricating wear-resistant composite coating are all significantly lower than that of Ti6Al4V alloy base. The composite coating has a good Self-lubricating wear resistance.