不同碳化钨含量对等离子弧熔覆镍基碳化钨涂层组织及性能的影响  

Effects of Different Tungsten Carbide Contents on Microstructure and Properties of Ni-based Tungsten Carbide Cladding Layer by Plasma Arc Cladding Technology

作　　者：吴磊[1] 浦娟[1] 吴铭方[1] 龙伟民[2] 钟素娟[2] 胡庆贤[1] 蓝阳 WU Lei;PU Juan;WU Mingfang;LONG Weimin;ZHONG Sujuan;HU Qingxian;LAN Yang(College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212000 [2]郑州机械研究所新型钎焊材料与技术国家重点实验室,郑州450001

出　　处：《材料导报》2021年第16期16111-16114,16119,共5页Materials Reports

基　　金：新型钎焊材料与技术国家重点实验室项目(SKLABFMT201905);江苏省自然科学基础面上项目(BK20191458);江苏科技大学本科生创新计划;江苏省研究生科研与实践创新计划(SJCX20-1457)。

摘　　要：采用等离子弧粉末熔覆技术在Q345钢表面熔覆镍基碳化钨涂层,研究了粉末中不同碳化钨含量对镍基碳化钨熔覆层组织及性能的影响。借助光学显微镜、扫描电镜及X射线衍射仪分析镍基碳化钨熔覆层的组织形貌,用显微硬度计和摩擦磨损实验机分别测量镍基碳化钨熔覆层的硬度和耐磨性。结果表明:镍基碳化钨熔覆层与基层之间呈冶金结合,涂层表面无气孔缺陷。镍基碳化钨涂层组织主要由碳化钨颗粒和镍基粘结相构成,碳化钨是WC和W_(2)C,镍基粘结相中包含SiC、Cr_(23) C_(6)、Ni 3Si、γ-Ni等物相。随着粉末中碳化钨含量从15%(质量分数,下同)增加至50%,熔覆涂层组织中硬质相数量增多,其硬度和耐磨性显著提高。当碳化钨含量为50%时,熔覆涂层硬度高达1024HV_(10)且耐磨性最好。Ni-based tungsten carbide cladding layer was fabricated on the surface of Q345 steel by plasma arc surfacing technology,the effects of diffe-rent tungsten carbides contents on the microstructure and property of Ni-based tungsten carbide cladding layer were investigated.The microstructure and morphology of the cladding layer were analyzed by using optical microscopy(OP),scanning electron microscopy(SEM),and X-ray diffractometer(XRD).The hardness and wear resistance of the cladding layer were tested with a microhardness tester and a friction-wear test machine.The results showed that there was a metallurgical bonding between the cladding layer and the base material,and no porosity existed on the surface of the cladding layer.The microstructure of the cladding layer was composed of the tungsten carbide particles in the form of WC and W_(2)C and Ni-based binders which contained SiC、Cr_(23) C_(6)、Ni 3Si、γ-Ni.When the content of tungsten carbide in the powder increased from 15%(mass fraction,the same below)to 50%,the number of hard phases in the microstructure of the cladding layer increased,which significantly improve the hardness and wear resistance of the cladding layer.When the content of tungsten carbide was 50wt%,the hardness of cladding layer was up to 1024HV_(10) and the wear resistance reached the optimum.

关 键 词：等离子弧粉末熔覆技术 镍基碳化钨粉末 组织 性能 

分 类 号：TG425[金属学及工艺—焊接]