不同黏结剂下激光熔覆镍基碳化钨增强涂层组织与性能的研究  

Study on the Microstructure and Properties of Laser Cladding Nickel-based Tungsten Carbide Coating Under Different Binder

作　　者：陈妍[1] 曾媛 徐欢欢 林晨 Chen Yan;Zeng Yuan;Xu Huanhuan;Lin Chen(Wuxi Transportation Branch of Jiangsu United Vocational and Technical College,Wuxi,Jiangsu 214151,China;Shanghai Medical College of Health,Shanghai 201318,China;School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao,Shandong 266520,China)

机构地区：[1]江苏联合职业技术学院无锡交通分院,江苏无锡214151 [2]上海健康医学院,上海201318 [3]青岛理工大学机械与汽车工程学院,山东青岛266520

出　　处：《应用激光》2022年第6期20-28,共9页Applied Laser

摘　　要：利用激光熔覆技术在42CrMo钢基体表面制备镍基碳化钨增强涂层,通过添加松香酒精溶液、醋酸纤维素和丙酮的混合溶液以及水玻璃的水溶液三种不同的黏结剂,研究在不同黏结剂下激光熔覆镍基碳化钨增强涂层的显微组织、元素组成、物相组成、显微硬度及耐磨性能。试验结果表明:激光熔覆涂层的物相成分为γ-Ni(Fe)、Ni_(3)Fe、WC、Cr_(23)C_(6)、Cr_(7)C_(3);在以松香酒精溶液为黏结剂时,得到的涂层底部为胞晶和一些树枝状的枝晶,组织分布较致密、均匀,涂层中部多为一些树枝状的枝晶;平均硬度为739.4 HV,平均摩擦因数为0.53,平均磨损量为14.07×10^(-3)mm^(3),相较于基体分别减小了约13%和68.5%,磨损形式为轻微的磨粒磨损和疲劳磨损,提升了涂层的耐磨性能。Using laser cladding technology to prepare nickel-based tungsten carbide reinforced coating on the surface of 42 CrMo steel substrate,this paper studied the microstructure,element composition,phase composition,microhardness and wear resistance of the nickel-based tungsten carbide reinforced coating under three different binders that were prepared by adding rosin alcohol solution,a mixed solution of cellulose acetate and acetone,and an aqueous solution of water glass.Results show that the phase composition of the laser cladding coating isγ-Ni(Fe),Ni_(3)Fe,WC,Cr_(23)C_(6),Cr_(7)C_(3).When the rosin alcohol solution is used as the binder,the bottom of the coating obtained is cell crystals and some dendritic dendrites.Moreover,the structure distribution is dense and uniform,and the middle of the coating is mostly dendritic dendrites.The average hardness is 739.4 HV,and the average friction coefficient is 0.53.The average wear volume is 14.07×10^(-3)mm^(3),which are reduced by about 13%and 68.5%,respectively,compared to the matrix.The form of wear is slight abrasive wear and fatigue wear,which improves the wear resistance of the coating.

关 键 词：激光熔覆 黏结剂 显微组织 硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]