超高速激光熔覆WC/Co合金和Co基合金涂层表面性能对比研究  

A Comparative Study on the Surface Properties of WC/Co Alloy Coating and Co-based Alloy Coating by Ultra-high Speed Laser Cladding

作　　者：付福兴 陈晓明 刘晨 FU Fuxing;CHEN Xiaoming;LIU Chen(School of Mechanical and Material Engineering,Shaanxi Province Key Laboratory of Surface Engineering and Remanufacturing,Xi’an University,Xi’an 710065,China)

机构地区：[1]西安文理学院机械与材料工程学院陕西省表面工程与再制造重点实验室,西安710065

出　　处：《西安文理学院学报(自然科学版)》2024年第3期85-90,共6页Journal of Xi’an University(Natural Science Edition)

基　　金：西安市科技计划创新基金:西安文理学院三年行动计划项目(2021XDJH02,21XJZZ0001-2)

摘　　要：采用超高速激光熔覆技术在304不锈钢基体表面分别制备WC/Co合金涂层与Co基合金涂层,对比分析两种涂层的微观组织、显微硬度、摩擦系数以及耐腐蚀性能.研究结果表明:两种合金涂层的组织均无微观裂纹与气孔缺陷,从界面到涂层表面,凝固组织由柱状晶转变为等轴枝晶,涂层与基体之间形成了良好的冶金结合,且WC/Co合金涂层整体组织相对于Co基合金涂层更加均匀细密;WC/Co合金涂层的显微硬度明显高于Co基合金涂层,且摩擦系数低于Co基合金涂层的摩擦系数,表明WC/Co合金涂层的耐磨性能优于Co基合金涂层;Co基合金涂层的电化学腐蚀电位高于WC/Co合金涂层腐蚀电位,但腐蚀电流密度低于WC/Co合金涂层腐蚀电流密度,表明Co基合金涂层的耐腐蚀性能要优于WC/Co合金涂层.WC/Co alloy coating and Co-based alloy coating were prepared on the surface of 304 stainless steel substrate by ultra-high-speed laser cladding technology.The microstructure,micro-hardness,friction coefficient and corrosion resistance of the two coatings were compared and analyzed.The results of research show that the microstructure of the two coatings have no microscopic cracks and porosity defects,the solidification microstructure changes from columnar crystal to equiaxial dendrites structure from the interface to the coating surface,a good metallurgical bond is formed between the coating and the substrate,and the overall microstructure of WC/Co alloy coating is more uniform and finer than that of Co-based alloy coating;The microhardness of WC/Co alloy coating is significantly higher than that of Co-based alloy coating,and the friction coefficient is lower than that of Co-based alloy coating,indicating that the wear resistance of WC/Co alloy coating is better than that of Co-based alloy coating.The electrochemical corrosion potential of Co-based alloy coating is higher than that of the WC/Co alloy coating,but the corrosion current density is lower than that of WC/Co alloy coating.Therefore,the corrosion resistance of Co-based alloy coating is better than that of the WC/Co alloy coating.

关 键 词：超高速激光熔覆 WC/Co合金涂层 耐磨性能 耐腐蚀性能 

分 类 号：TG172[金属学及工艺—金属表面处理] O432.1[金属学及工艺—金属学]