钛合金具有比强度高、耐腐蚀性能好等优点, 但其硬度低、耐磨性能差, 限制了它在航空工程摩擦构件和生物医学工程上的应用。研究自行设计了3种预涂粉层的成分, 采用HL-5000型横流CO2激光加工机在TC4钛合金表面相应地制备了TiC+Ti、 TiC+Ti+ F102和TiC+ F102 3种熔覆层。通过SEM, EDAX, XRD, HXD-1000TMC型显微硬度计, HT-600型高温摩擦磨损试验机, 分析了熔覆层的显微组织、成分、物相, 测试了激光熔覆层的显微硬度和滑动摩擦磨损性能。结果表明: (TiC+Ti+ F102)和(TiC+ F102)熔覆层有可能用于航空结构材料；而(TiC+Ti)熔覆层有希望用于生物医学功能材料, 但仍需作进一步的研究。

Titanium alloy exhibits excellent mechanical property and good corrosion resistance, but its low hardness and poor wear resistance limits its wide application in air-crafter part and in biomedicine. In order to improve its performance, laser with 5.0 kW from continuous wave CO2 laser machine was deployed to prepare TiC+Ti, TiC + Ti +F102 and TiC +F102 cladded coating on the surface of TC4 titanium alloy. Their microstructure, composition, phase, micro-hardness and friction wear properties were investigated through SEM, EDAX, XRD, HXD-1000TMC Micro-hardness tester and HT-600 abrasion machine, respectively. Results indicate that the laser cladding coating of TiC+Ti+F102 and TiC +F102 can be used as structural materials for aerospace and the coating of TiC+Ti is desired in application as biomedicine function materials, and it needs further research.