以Ni-Si-Nb-C混合粉末作为预置合金,采用横流CO₂激光器进行激光熔覆处理,在高温合金表面制备原位合成NbC颗粒增强Ni3Si复合材料涂层。结果表明,采用合适的激光熔覆工艺参数,可获得NbC颗粒增强的以Ni3Si金属间化合物及γ-Ni固溶体为主要组成相的复合涂层。尺寸约在2-4 μm的NbC颗粒弥散分布,与复合材料基体润湿良好,熔覆层致密,组织细小,与基材呈良好的冶金结合。晶体结构及动力学生长过程决定了NbC以不同的生长形态出现。

Intermetallic matrix composite (IMC) surface layer has been formed on Ni-based alloy surface by laser cladding via CO₂ laser. The Ni3Si composite coating of NbC particles reinforced was prepared by in situ contact reaction with preplaced powder mixtures of Ni-Si-Nb-C. It was found that compound material cladding coating mainly consists of NbC particles,Ni3Si intermetallic and Ni solid solution. An excellent bonding between the coating and the substrate was ensured by the strong metallurgical interface and good wettability between the reinforced NbC and the coating matrix. The NbC particles were about 2-4 μm in size and dispersed in the coating. The crystal structure of NbC and the growth kinetics of laser cladding play an important role in controlling the growth morphology of carbide.