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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Ti C为增强相、γ-Ni Cr Al Ti固溶体为增韧相、Ca F2为自润滑相的γ-Ni Cr Al Ti/Ti C/Ca F2自润滑耐磨复合涂层。分别在室温、300℃和600℃时测试了复合涂层和Ti6Al4V合金基体的干滑动磨损性能,并且讨论了其与对磨球的磨损机理。结果表明:从室温到600℃,γ-Ni Cr Al Ti/Ti C/Ca F2自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,该复合涂层具有较好的自润滑耐磨性能;对偶件Si3N4陶瓷球的磨损也有一定程度的降低。600℃时,Ti6Al4V基体的磨损机理为氧化塑性变形,γ-Ni Cr Al Ti/Ti C/Ca F2磨损机理为润滑转移层的形成。
In order to improve the tribological properties of Ti6Al4V alloy, the laser cladding technique was used to prepare γ-Ni Cr Al with Ti C as reinforcing phase, γ-Ni Cr Al Ti as toughening phase and Ca F2 as self-lubricating phase on Ti6Al4V surface Ti / Ti C / Ca F2 self-lubricating wear-resistant composite coating. The dry sliding wear properties of the composite coating and the Ti6Al4V alloy substrate were tested at room temperature, 300 ℃ and 600 ℃, respectively. The wear mechanism of the composite was also discussed. The results show that the friction coefficient and the wear rate of γ-Ni Cr Al Ti / Ti C / Ca F2 self-lubricating wear-resistant composite coating decrease significantly from room temperature to 600 ℃ than that of Ti6Al4V alloy. The composite coating has good Self-lubricating wear resistance; dual wear Si3N4 ceramic balls have also been reduced to some extent. At 600 ℃, the wear mechanism of Ti6Al4V matrix is oxidative plastic deformation, and the wear mechanism of γ-Ni Cr Al Ti / Ti C / Ca F2 is the formation of lubrication transfer layer.