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通过激光熔化沉积TA15+30%TiC(体积分数)混合粉末,在TA15钛合金表面制备出钛基复合材料涂层,分析了涂层的组织、硬度及界面结合强度。结果表明,激光熔化沉积过程中原始TiC颗粒发生溶解,并在凝固过程中重新析出细小的TiC,TiC有等轴状及枝晶两种形态,涂层中存在部分未熔的TiC颗粒;涂层硬度达HRC60;涂层与基体界面为完全冶金结合,涂层的界面结合强度大于310MPa,抗剪切强度为330MPa;经弯曲及热震试验后,涂层未出现剥落现象,表明涂层与基体具有很好的相容性。
The titanium-based composite coating was prepared on the surface of TA15 titanium alloy by laser melting deposition TA15 + 30% TiC (volume fraction) mixed powder, and the microstructure, hardness and interface bonding strength of the coating were analyzed. The results show that the original TiC particles dissolve during the process of laser melting deposition and fine TiC is re-precipitated during the solidification process. There are two forms of equiaxed and dendritic TiC. There are some unmelted TiC particles in the coating. Hardness up to HRC60; coating and the substrate interface is completely metallurgical bonding, the interface bonding strength of the coating is greater than 310MPa, shear strength of 330MPa; after bending and thermal shock test, the coating does not appear spalling, indicating that the coating and the substrate Has good compatibility.