等离子熔覆添加碳化钨的铁基合金涂层的研究  

Study on the Coating by Plasma Cladding Fe-based Alloy Added WC

作　　者：卢金斌[1] 弓金霞[1] 彭竹琴[1] 张瑞杰[1] 毋新房[2] 

机构地区：[1]中原工学院材料与化工学院,河南郑州450007 [2]水利部水工金属质量检验测试中心,河南郑州450007

出　　处：《表面技术》2009年第4期4-6,共3页Surface Technology

基　　金：河南省基础与前沿技术研究(072300440020)

摘　　要：为了提高钢铁材料表面的硬度和耐磨性，采用等离子弧在Q235钢基体上熔覆添加50％镍包WC的Fe—Cr-B—Si合金粉末，制备了具有冶金结合的复合涂层。采用SEM、EDS、XRD等研究了涂层的组织，利用显微硬度计测试了涂层的显微硬度分布。结果表明：Q235钢表面经等离子熔覆形成的复合涂层中，WC颗粒部分溶解于铁基合金，WC颗粒与涂层界面形成厚达数微米的反应层，有效提高了涂层与WC的界面结合强度。涂层由基体组织γ-Fe枝晶，颗粒状WC、Fe，W3C、Fe6W6C、W2C等相组成，其显微硬度可达560～820HV0.2。To improve the hardness and wear resistance of steel, a composite coating metallurgically bonded to substrate was prepared by plasma cladding Fe-based alloy added 50% WC on Q235 steel. The microstructure of the coating was investigated by SEM, EDS and XRD, and the microhardness distribution of the coating was tested by microhard- ness tester. The interface between WC particle and steel matrix was examined. The results show that the WC particles in the composites are partly melted into the steel matrix, and the reaction layer of several microns is formed at the interface between WC and Fe-based alloy, which enhances the bonding strength of interface effectively. The microstructure of coating is mainly consisted of γ-Fe, WC, Fe3W3C, Fe6W6C and W2C. The microhardness of the coating reaches 560 - 820 HV0.2.

关 键 词：等离子熔覆 铁基合金 显微硬度 WC 

分 类 号：TG174.442[金属学及工艺—金属表面处理]