铈掺杂镍基碳化钨激光熔覆层的耐磨性能

Wear resistance of Ce doped Ni based-WC coating prepared by laser cladding

使用激光熔覆法制备了铈掺杂镍基碳化钨涂层,使用X射线衍射仪和扫描电镜观察了涂层的相组成与微观结构,使用摩擦磨损和冲蚀磨损试验测定了室温、400℃和800℃下涂层的耐磨性能。结果表明,微量的CeO2可以抑制WC在高温下的分解反应,细化碳化物晶粒,减少裂纹的产生和扩展。CeO2添加量为0.5wt%时,涂层的显微硬度最高,在不同温度下的耐磨性能最好。

Ni based-WC coating with Ce doped was prepared by laser cladding.The microstructure of laser clad coating was investigated by means of XRD and SEM.Wear resistance of the coating was tested by sliding wear and impact abrasion wear tests at room temperature,400℃and 800℃,respectively.The results showed that the coating with a small amount of CeO2 can inhibit the decomposition reaction of WC at high temperature,refine the grains sizes of carbides and reduce the formation and propagation of cracks.The coating with 0.5wt%CeO2 presents the highest microhardness and the best wear resistance at different temperatures.