核阀阀瓣激光熔覆层显微组织和耐高温磨损性能研究

Study on Microstructure and High Temperature Wear Resistance of Laser Cladded Nuclear Valve Clack

摘要: 应用 5kW横流CO2 激光器对核阀阀瓣密封面进行Co基合金的激光熔覆处理, 对激光熔覆层和等离子熔涂涂层进行了显微组织分析和抗高温冲击滑动磨损性能对比试验研究。结果表明 :激光熔覆层的组织细密均匀, 气孔、夹杂物少, 稀释率低, 其抗高温冲击滑动磨损性能明显高于等离子熔涂工艺。

Abstract: Laser cladding of Co base alloy on the nuclear valve sealing surface are performed with a 5 kW CO 2 transverse flowing laser. The microstructure and the high temperature impact slide wear resistance of the laser cladded coating and the plasma cladded coating are studied. The results show that the microstructure, the dilution rate and the high temperature impact slide wear resistance of the laser cladded coating have obvious advantages over the spurt cladding processing.