纯铜表面激光熔覆WC-Co涂层研究
tudy on WC-Co Coating on Pure Copper Surface by Laser Cladding
李养良1,2, 杜大明1,2, 张汪年1,2
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作者单位：1. 九江学院 机械与工程学院, 江西 九江 332005; 2. 九江市绿色再制造重点实验室, 江西 九江 332005
中文关键字：激光熔覆； 纯铜； 显微组织； 硬度
英文关键字：laser cladding; pure copper; microstructure; microhardness
中文摘要：利用超音速火焰喷涂和激光重熔技术在纯铜基体上制备WC-Co涂层。利用维氏硬度计测试了其显微硬度，用扫描电镜分析了激光熔覆层的微观形貌。结果表明：所制得熔覆层组织致密、无裂纹，与基体形成了良好的冶金结合。熔覆区表层的WC颗粒均匀分布，颗粒较小，形成了一层硬度很高的耐磨层，在熔化区中下部，组织为基体Cu和Co、W等组成的固溶体以及呈散落状分布着一些未熔化的大小不一的WC颗粒。激光熔覆区的显微硬度约为基体的10倍。
英文摘要：WC-Co coating on pure copper surface was prepared by high velocity air fuel and laser cladding. The microhardness of the cladding layer was measured by microhardness tester, and its microstructure was observed by SEM. The results show that the cladding layer has compact and flawless microstructure and has been metallurgically integrated with pure copper substrate. The WC particles of the cladding surface layer are homogeneous distribution and smaller, which form a layer of wearing layer. Some WC particles as the base for the copper is unmelted and asymmetry state in the cladding area. The microhardness of the cladding zone is 10 times of the substrate.