WC含量对WC增强镍基复合涂层界面组织的影响  

Effect of WC content on the interface microstructure of nickel/tungsten carbide composite brazing coating

作　　者：王星星[1] 田家豪 武胜金 康克家 凌自成 杜全斌 温国栋[3] WANG Xingxing;TIAN Jiahao;WU Shengjin;KANG Kejia;LING Zicheng;DU Quanbin;WEN Guodong(North China University of Water Resources and Electric Power,Zhengzhou,450045,China;Henan Mechanical and Electrical Vocational College,Zhengzhou,451191,China;Xi’an University of Science and Technology,Xi’an,710054,China)

机构地区：[1]华北水利水电大学,郑州450045 [2]河南机电职业学院,郑州451191 [3]西安科技大学,西安710054

出　　处：《焊接学报》2024年第1期40-46,I0005,I0006,共9页Transactions of The China Welding Institution

基　　金：国家自然科学基金项目(52071165,51705151);河南省高校科技创新人才支持计划(22HASTIT026);河南省高层次人才特殊支持“中原英才计划-中原青年拔尖人才”计划;河南省超硬材料智能制造装备集成重点实验室开放课题(JDKJ2022-02);龙门实验室开放课题(LMQYTSKT016)。

摘　　要：WC(碳化钨)增强镍基复合涂层具有高耐磨、耐腐蚀、高硬度特点,在盾构部件、旋耕刀具、石油钻探等领域广泛应用.为提高水力机械过流部件服役寿命,以WC颗粒和镍基粉状钎料为涂层材料,采用真空炉中热辐射钎涂方法在奥氏体不锈钢表面成功制备WC增强镍基复合钎涂层,借助扫描电镜、X射线衍射仪等对钎涂层显微组织和界面行为进行系统分析.结果表明,硬质相WC与镍基钎料界面结合存在机械咬合与冶金结合双重作用;钎涂层与钢基体之间存在一定程度的成分扩散,其较狭窄扩散区宽度约100μm;当WC含量低于25%时,复合钎涂层对不锈钢基体润湿性较好,可制备出最低孔隙率1.08%的复合钎涂层.Nickel/tungsten carbide composite coating has high wear resistance,corrosion resistance,and high hardness characteristics.It is widely used in shield machine parts,rotary blade,and other fields.In order to improve the lifespan of the hydraulic machinery overflow components,the nickel/tungsten carbide composite brazing coating was successfully prepared.It was combined with the surface of austenitic stainless steel by brazing coating method with thermal radiation in vacuum furnace.In the joint,WC particles and nickel-based powder brazing alloys were used as coating materials.The microstructure and interfacial behavior of the brazing coating were analyzed with the scanning electron microscopy,X-ray diffractometer,and metallographic microscopy.The results show that the interface between WC hard-phase and nickel-based brazing alloy achieved mechanical and metallurgical bonding.There is cer-tain component diffusion between the brazing coating and steel substrate.And the thickness of narrowest diffusion area is about 100μm.When the WC content is lower than 25wt.%,the brazing coating has better wettability on the steel substrate.The internal denseness of the coating stays in high level.Meanwhile,the minimum porosity in the composite coating can be kept at 1.08%.

关 键 词：钎焊 复合涂层 WC增强镍基钎料 界面组织 润湿性 

分 类 号：TG454[金属学及工艺—焊接]