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为了改进TC4钛合金的耐磨性能,开发具有热应力缓和功能的梯度涂层,在对梯度涂层优化设计的基础上,采用激光熔覆的方法在TC4钛合金的表面上制备耐磨钛基功能梯度(Ti-FGM)复合涂层,观察了微观组织,测量了Ti-FGM涂层和基材在大气环境室温下的摩擦磨损性能和显微硬度。结果表明:原位自生的增强相TiC颗粒均匀分布在梯度功能耐磨熔覆层中,微观组织沿熔覆方向呈现粗大树枝晶到颗粒状晶体的变化。复合涂层硬度呈现梯度上升趋势且涂层顶部表现出较优异的耐磨性能。
In order to improve the wear resistance of TC4 titanium alloy, a gradient coating with thermal stress relaxation function was developed. Based on the optimized design of gradient coating, a laser cladding method was used to prepare a wear-resistant titanium base on the surface of TC4 titanium alloy (Ti-FGM) composite coating. The microstructure was observed. The tribological properties and microhardness of the Ti-FGM coating and the substrate were measured at room temperature. The results show that the in-situ TiC particles are uniformly distributed in the graded wear-resistant coating and the microstructure changes from coarse dendrites to granular crystals along the cladding direction. The hardness of the composite coating showed a gradient upward trend and the top of the coating showed more excellent wear resistance.