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采用HL-5000型横流CO2激光加工机,在TC4钛合金表面制备了表面平整、细密、消除了裂纹与孔隙的TiC复合涂层。通过SEM、EDAX、XRD、HXD-1000TMC型显微硬度计和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,激光熔覆制备的TiC复合涂层与基体呈冶金结合,涂层中有大量小块状、针状TiC颗粒和TiC树枝晶,熔覆层的显微硬度达880~1087 HV0.1,耐磨性能比TC4钛合金显著提高。
The HL-5000 cross-flow CO2 laser processing machine was used to prepare a TiC composite coating with smooth surface and fine cracks and pores on TC4 titanium alloy. The microstructure, composition and phase of the cladding layer were analyzed by SEM, EDAX, XRD, HXD-1000TMC and HT-600 high temperature friction and wear tester. The microstructure of the laser cladding layer Hardness and sliding friction wear properties. The results show that the TiC coating prepared by laser cladding is metallurgically bonded to the substrate. The coating contains a large number of small, needle-shaped TiC particles and TiC dendrites. The microhardness of the coating is 880-1087 HV0.1 , Wear resistance than TC4 titanium alloy significantly improved.