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采用HL-5000型横流CO_2激光加工机,通过加入适量的稀土氧化物Y_2O_3在TC4钛合金表面制备了表面较平整、较细密、基本消除了裂纹与孔隙并与基体呈冶金结合的TiC复合涂层。研究了稀土氧化物Y_2O_3对激光熔覆层的显微组织、物相、显微硬度和滑动摩擦磨损性能的影响。结果表明:在本文所述的试验条件下,在熔覆层中添加稀土氧化物Y_2O_3的较佳重量百分比为0.6%,在TC4钛合金表面激光熔覆制备的TiC复合涂层中加入适量的稀土氧化物Y_2O_3,可有效改善熔覆层的组织和性能。
The cross-flow CO_2 laser processing machine HL-5000 was used to prepare the TiC composite coating on TC4 titanium alloy by adding the appropriate amount of rare earth oxide Y_2O_3 on the surface of TC4 titanium alloy. The TiC composite coating was more smooth, dense and basically eliminated the cracks and pores and metallurgically bonded with the substrate . The effects of rare earth oxide Y_2O_3 on the microstructure, phase, microhardness and sliding friction and wear properties of laser cladding layer were studied. The results show that the best weight percentage of rare earth oxide Y_2O_3 added in the cladding layer is 0.6% under the experimental conditions described in this article. Appropriate amounts of rare earths are added into the TiC composite coating prepared by laser cladding on the surface of TC4 titanium alloy Oxide Y_2O_3, can effectively improve the microstructure and properties of the cladding.