双丝电弧喷涂Fe(WC)/Ni(WC)复合涂层显微组织及性能  

Microstructure and performance of Fe(WC)/Ni(WC) composite coating prepared by twin wire arc spraying

作　　者：邱明坤 张树玲[1] 陈炜晔 于永川 田宇[1] 郜雪楠 卞东伟 朱学军[1,3] Javad Mostaghimi QIU Mingkun;ZHANG Shuling;CHEN Weiye;YU Yongchuan;TIAN Yu;GAO Xuenan;BIAN Dongwei;ZHU Xuejun;JAVAD Mostaghimi(School of Mechanical Engineering,Ningxia University,Yinchuan 750021,China;School of Material Science and Engineering,North Minzu University,Yinchuan 750021,China;Key Laboratory of Ningxia Intelligent Equipment CAE,Yinchuan 750021,China;Centre for Advanced Coating Technologies (CACT),University of Toronto,Toronto M5S 3G8,Canada)

机构地区：[1]宁夏大学机械工程学院,银川750021 [2]北方民族大学材料科学与工程学院,银川750021 [3]宁夏智能装备CAE重点实验室,银川750021 [4]多伦多大学先进涂层技术中心(CACT)

出　　处：《功能材料》2019年第4期4098-4103,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51604159;51861031);宁夏自然科学基金资助项目(2018AAC03056)

摘　　要：借助双丝电弧喷涂技术在316L不锈钢基体表面成功制备了高硬度、高强度的FeNi(WC)复合涂层,并对涂层显微组织结构及性能进行了分析研究。利用扫描电子显微镜(SEM)观察涂层截面显微组织形貌,并用其配置的X射线能谱(EDS)对涂层不同区域进行能谱分析,确定涂层中元素组成及分布情况,通过X射线衍射仪(XRD)对涂层进行相组成分析,并使用ImageJ图像处理软件测定涂层的孔隙率,采用维氏显微硬度计分别测定了基体和涂层显微硬度。实验结果表明,双丝电弧喷涂技术所制备的FeNi(WC)复合涂层与基体结合良好,组织均匀致密,涂层中含有部分孔洞和裂纹,但对基体的整体性能影响不大。FeNi(WC)复合涂层中主要物相为Fe和Ni组成的金属固溶体化合物FeNi、Fe_3Ni_2和硬质相WC、W_2C。基体平均显微硬度为213 Hv_(0.1),涂层平均显微硬度高达714 Hv_(0.1),约为基体硬度的3～4倍。涂层EDS面扫描得出涂层中元素均匀混合分布,C和W均匀分布在Fe和Ni元素之间,O元素的存在是喷涂过程中氧化所致。FeNi(WC)复合涂层是由Fe、Ni、C和W等主要元素组成的粘结相和硬质相交叉分布形成的典型层状结构,粘结相中弥散分布的硬质相使得涂层的硬度及整体性能得到明显提高。The work aims to prepare composite coatings with high-hardness and high-strength on the surface of stainless steel substrate by twin wire arc spraying and to study its microstructure and properties.The cross-sectional microstructural images of coating were observed and analyzed by scanning electron microscopy(SEM),and the energy spectrum in different regions was analyzed by SEM with EDS to determine the composition and distribution of each element in the coating.The phase composition of coating was analyzed by X-ray diffractometer(XRD),and the porosity of coating was determined by using the ImageJ image pressing software.At the same time,the microhardness of the substrate and the coating was measured by Vickers microhardness tester.The experimental results show that FeNi(WC)composite coating prepared by twin wire arc spraying had good bonding with the substrate and the structure was uniform and compact.The coating contained some pores and cracks,but had little effect on the overall performance of the substrate.The main phase of the FeNi(WC)composite coating were FeNi and Fe 3Ni 2 composed of Fe and Ni,and the hard phases WC and W 2C.The average microhardness of the substrate was 213 Hv 0.1,and the average microhardness of coating could reach 714 Hv 0.1,which was 3-4 times as high as that of the substrate.The EDS plane scanning of the coating showed a uniform distribution of the elements in the coating.C and W were evenly distributed between the Fe and Ni elements,and the presence of the O element was caused by oxidation during the spraying process.The FeNi(WC)composite coating consisted of a typical layered structure formed by the cross-distribution of the binder phase and the hard phase composed of main elements such as Fe,Ni,C and W.The hard phase dispersed in the binder phase made the hardness and overall performance of the coating increase dramatically.

关 键 词：双丝电弧喷涂(TWAS) 粉芯丝材 复合涂层 组织结构 显微硬度 孔隙率 相组成 

分 类 号：TG174.4[金属学及工艺—金属表面处理]