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采用钨极氩弧熔覆,在碳钢基体表面采用不同工艺方法制备了含有SiC粉末和铁的涂层。利用扫描SEM、洛氏硬度计、摩擦磨损试验机分别对不同涂层的微观形貌、洛氏硬度和摩擦磨损特性进行了分析。结果表明:Si的含量由表向里逐渐减少,氩弧熔覆过程中SiC颗粒发生分解,形成了碳化物。由于碳化物的存在,熔覆层硬度达到45.8 HRC以上,比基体硬度提高一倍以上;摩擦系数较基体有所提高,磨损体积比基体小,具有良好的耐磨性。
Using tungsten argon arc cladding, a coating containing SiC powder and iron was prepared on the surface of a carbon steel substrate using different processes. The microstructure, Rockwell hardness and friction and wear characteristics of different coatings were analyzed by scanning SEM, Rockwell hardness tester and friction and wear tester respectively. The results show that the content of Si decreases gradually from the surface to the surface and the SiC particles decompose during the process of argon arc cladding to form carbides. Due to the presence of carbides, the hardness of the cladding layer is above 45.8 HRC, which is more than double the hardness of the matrix; the friction coefficient is higher than that of the matrix, and the wear volume is smaller than that of the matrix, and has good abrasion resistance.