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《Materials for Mechanical Engineering》 2009-01
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Microstructure and Hardness of the Laser Cladding Ni-based Alloy Coating on the Surface of Cu

CHEN Zhi-kun1,2,LIU Min2,ZENG De-chang1,MA Wen-you2,LI Fu-hai2,DENG Chang-guang2(1.South China University of Technology,Guangzhou 510640,China;2.Guangzhou Research Institute of Non-ferrous Metals,Guangzhou 510650,China)  
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 13 μm 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.
【Fund】: 广州市科技计划项目资助(2006Z3-D0281)
【CateGory Index】: TG174.44
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