铜表面激光熔覆镍基合金的显微组织与硬度  

Microstructure and Hardness of the Laser Cladding Ni-based Alloy Coating on the Surface of Cu

作　　者：陈志坤[1,2] 刘敏[2] 曾德长[1] 马文有[2] 李福海[2] 邓畅光[2] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]广州有色金属研究院,广东广州510650

出　　处：《机械工程材料》2009年第1期51-54,共4页Materials For Mechanical Engineering

基　　金：广州市科技计划项目资助(2006Z3-D0281)

摘　　要：用超音速火焰喷涂方法在铜基体表面预置一层镍基合金涂层后,再用高功率密度的激光进行熔覆;用OM、SEM、XRD、显微硬度计对熔覆层进行了表征。结果表明:熔覆层组织致密、无裂纹,气孔、夹杂等缺陷明显减少;在熔覆层底部形成了高熔点、高密度钨相带,其显微硬度明显升高;熔覆层与基体的界面处有铜、镍互渗的冶金结合层形成,其厚度约为13μm;熔覆层的显微硬度是铜基体硬度的8倍以上。A Ni-based alloy coating was formed by high velocity air fuel （HVAF） spaying first on the surface of Cu-substrate and then irradiated by high power density laser. The cladding layer was characterized by OM, SEM, XRD and microhardness tester. The results show that an excellent laser cladding coating was obtained by HVAF with dense microstructure, crackfree and obviously reduced pores and inclusions. It was found that a W phase layer with high melting point and high density was formed at the bottom of the laser cladding coating, which increased the microhardness obviously. The metallurgical bonding layer with about 13μm in thickness was found due to the Cu and Ni diffusion into each other between the coating and the substrate. The average microhardness of cladding layer was more than eight times to that of the Cu substrate.

关 键 词：激光熔覆 超音速火焰喷涂 镍基合金 钨相带 

分 类 号：TG113.1[金属学及工艺—物理冶金]