核阀零件激光熔履层耐磨性的研究

Study on Sliding Wear Resistance of Laser Cladded Nuclear Valve Parts

应用 5k W横流 CO2 激光器在核阀阀瓣密封面上熔覆 Co基自熔合金 ,采用预置粉末法进行多道扫描。研究了激光熔覆和等离子喷焊 2种工艺形成的涂层对抗擦伤磨损性能的影响。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 ,其抗擦伤磨损性能明显高于等离子喷焊和堆焊工艺 ,随着载荷增大 ,这种耐损性的差距将进一步拉开。图 1表 3参

Laser cladding of Co base alloy on the nuclear valve sealing surface has been performed with a 5kW CO 2 flow transverse laser. The effect of the laser cladded coating and the plasma spurt welded coating on the sliding wear resistance has been studied. The results showed that the microstructure, the dilution rate, the sliding wear resistance of the laser cladded coating have obvious advantages over the spurt welding and the bead welding processing. Fig 1, tables 3 and refs 7.