钢基底表面钨极氩弧熔覆SiC涂层制备工艺及耐磨性能的研究
The research of processing technology and wearing resistance of SiC coating enhanced by Tungsten arc welding on steel substrate
焦少彬
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作者单位：湖南省湘潭大学机械工程学院
中文关键字：钨极氩弧熔覆，SiC涂层，微观组织，耐磨性能
英文关键字：Tungsten arc welding，SiC coating，Microstructure，wearing resistance property
中文摘要：摘要：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一定比例的SiC粉末和铁的涂层。利用扫描电镜（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，熔覆层洛氏硬度达到了HRC45.8以上，比基体硬度提高了一倍以上；摩擦系数较基体都有所提高，磨损体积比基体要小，具有良好的耐磨性能。
英文摘要：Abstract：The in-situ SiC particle reinforced composites coating layer had been produced by Tungsten arc welding with different processing parameters on steel. Microstructure of these coatings were analyzed by Scanning Electron Microscopy（SEM）. Rockwell hardness and anti-wearing properties were measured using Vickers Rockwell-hardness tester and wearing testing machine，respectively. The results show that carbides are formed due to decomposition of SiC particles. The Si content of the coating reduces from the surface to inside. The composite coating layer has higher surface rigidity of exceeding HRC45.8 and better abrasion resistance property. The friction coefficient of the SiC coating is a little higher and its abrasion loss is smaller than those of the steel substrate, respectively.