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采用激光熔覆技术在TC4钛合金表面制备以反应合成TiB2和TiC颗粒为增强相的Ni基复合涂层,利用УТИТВ-100型销-盘摩擦磨损试验机研究了激光熔覆层在真空(10-5Pa)中的干滑动摩擦磨损性能,利用光学显微镜和扫描电子显微镜观察了摩擦偶件的磨损表面形貌,讨论了激光熔覆层的磨损机制。结果表明,激光熔覆层的摩擦系数在0.25～0.5之间,明显低于TC4合金的摩擦系数(0.45～0.8),磨损体积约为TC4合金的40%。随法向载荷和滑动速度的增加,激光熔覆层的磨损体积增加,激光熔覆层的磨损机制主要为粘着磨损和粘附转移物引起的磨粒磨损。
Laser cladding technology was used to prepare Ni-based composite coatings with TiB2 and TiC particles as reinforcing phases on the surface of TC4 titanium alloy. The effects of laser cladding on the surface of TC4 titanium alloy under vacuum (10 -5Pa). The wear surface morphology of the friction couple was observed by optical microscope and scanning electron microscope, and the wear mechanism of the laser cladding layer was discussed. The results show that the friction coefficient of laser cladding is between 0.25 and 0.5, which is obviously lower than that of TC4 alloy (0.45 ~ 0.8). The wear volume is about 40% of that of TC4 alloy. With the increase of normal load and sliding speed, the wear volume of laser cladding layer increases. The wear mechanism of laser cladding layer is mainly abrasive wear of adhesion and adhesion transfer.