WC-氧化石墨烯/Ni复合熔覆层的制备及形成机制  

Fabrication and formation mechanism of vacuum cladding WC-graphene oxide/Ni composite coating

作　　者：杨贵荣[1] 王宁[1] 宋文明[2] 李亚敏[1] 马颖[1] YANG Guirong;WANG Ning;SONG Wenming;LI Yamin;MA Ying(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Lanpec Technologies Co.Ltd.,Lanzhou 730070,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]甘肃蓝科石化高新装备股份有限公司,兰州730070

出　　处：《复合材料学报》2020年第10期2489-2500,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51765035,51205178)。

摘　　要：采用真空熔覆技术制备了WC-氧化石墨烯(GO)/Ni复合熔覆层,运用扫描电镜、能谱仪、X射线衍射仪观察并分析在不同温度下熔覆层内显微形貌的变化与物相组成。结果表明:在ZG45表面制备了组织致密、与基体形成良好冶金熔合的WC-GO/Ni复合熔覆层;熔覆层的微观结构组成从表面至基体依次是约1.5 mm厚的复合层、360μm左右的过渡层、50μm左右的扩散熔合层和100μm左右的扩散影响层,其主要组成相有Cr7C3、FeNi3、WC、Cr23C6、Ni3Si、C、Fe7W6、γ-Ni固溶体等,FeNi3、Fe7W6分散在冶金熔合带,扩散影响区主要组织为珠光体;复合区的物相尺寸小于界面区的物相尺寸,熔覆层形成过程中复合区的金属颗粒变化先于界面区,凝固时熔化不完全的颗粒表面长出团簇物(Cr7C3/Cr23C6),随着保温长大逐渐变成针状物镶嵌在Ni基固溶体中。WC-graphene oxide(GO)/Ni composite coating was fabricated by vacuum cladding technique.The microstructural change and phase composition of the coating at different temperatures were observed and analyzed by scanning electron microscopy,energy dispersive spectroscopy and X-ray diffractometer.The results show that the WC-GO/Ni composite coating with dense microstructure and good metallurgical fusion with the matrix was successfully fabricated on the ZG45 substrate.There are four sub-layers from the coating surface to substrate,they are composite layer with about 1.5 mm thickness,transition layer with about 360μm thickness,diffusion fusion layer with about 50μm thickness and diffusion affected layer with 100μm thickness.The main phases of WC-GO/Ni composite coating are Cr7C3,FeNi3,WC,Cr23C6,Ni3Si,C,Fe7W6,γ-Ni solid solution.FeNi3 and Fe7W6 are dispersed in the metallurgical fusion zone,and the main phase of the diffusion affected zone is pearlite.The phase size of the composite zone is smaller than that of the interface zone.The changing of metal particles at composite area precedes that at the interface area.The clusters(Cr7C3/Cr23C6)formed on the incompletely melted metal particles surface and grew into needle shape.The needle carbides are embedded in the Ni-based solid solution among the coating.

关 键 词：真空熔覆 复合熔覆层 形成机制 镍基合金 WC 氧化石墨烯(GO) 

分 类 号：TB331[一般工业技术—材料科学与工程]