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采用Ti-C-Al体系激光点火自蔓延合成TiC/Al材料的同时,在Ti6Al4V钛合金表面形成均匀厚度的涂层。实验所用设备为2kWNd:YAG脉冲固体激光器;原料中钛碳原子比1:1,铝含量范围10%~40%(质量分数)。原料中的铝含量对原位合成的TiC颗粒形态和大小影响较大,通过实验确定了原料中合适的铝含量。利用扫描电镜对涂层与基体结合界面微观结构进行表征,测试涂层的显微硬度和耐磨性。结果表明,涂层和基体有良好的冶金结合;TiC颗粒在涂层表面处主要以树枝晶状存在,而在涂层与基体连接处主要为近球状晶粒;涂层显微硬度可达到8000MPa(HV0.5),约为基材的2~3倍。
Ti-C-Al system by laser ignition of self-propagating TiC / Al material while forming a uniform thickness of Ti6Al4V titanium alloy coating. Experimental equipment used for 2kWNd: YAG pulsed solid-state laser; raw material titanium carbon atomic ratio of 1: 1, aluminum content range of 10% to 40% (mass fraction). The content of aluminum in the raw material has a great influence on the morphology and size of TiC particles synthesized in-situ, and the proper aluminum content in the raw material is determined experimentally. The microstructure of the interface between the coating and the substrate was characterized by scanning electron microscopy to test the microhardness and wear resistance of the coating. The results show that there is a good metallurgical bond between the coating and the substrate. TiC particles mainly exist as dendrites at the coating surface, while near the globular grains at the interface between the coating and the substrate. The microhardness of the coating can reach 8000MPa (HV0.5), about 2 to 3 times the substrate.