等离子熔—喷WC-17Co涂层的组织结构II  

Microstructures of W-17Co coating produced by plasma melt sprayingⅡ

作　　者：郭面焕[1] 刘爱国[1] 赵敏海[1] 齐海群[1] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点试验室,哈尔滨150001

出　　处：《焊接学报》2006年第6期5-8,共4页Transactions of The China Welding Institution

基　　金：国家863高技术研究发展计划资助项目(2002AA331080);哈尔滨工业大学现代焊接生产技术国家重点试验室基金资助项目

摘　　要：采用等离子熔—喷技术,在Q235钢表面制作了具有冶金结合的WC-17Co金属陶瓷涂层。采用光学显微镜、SEM、TEM、及EDS等方法,对熔—喷层的组织形貌、相结构及成分进行了分析研究。结果表明,熔—喷涂层组织结构比较复杂,而且有规律地分布在涂层中的不同区域,表层主要由十字花状Fe3W3C初晶、鱼骨状γ-Fe+Fe3W3C共晶、鱼骨状共晶周围的“黑边”和基体组成。中部主要由粗大的树枝状Fe3W3C初晶和枝晶间γ-Fe+Fe3W3C(FeW3C)共晶组成。底部组织比较细密,主要由碳化物WC、Fe3W3C初晶和γ-Fe+Fe3W3C(FeW3C)共晶组成。W-17Co metallic ceramic coating was produced by plasma melt spraying (PMS) on low carbon steel Q235. Metallurgical bonded coating had been obtained. Microstructures, phases and compositions of the coating were analyzed with optical microscope, scanning electron microscope, transmission electron microscope , and energy dispersive spectroscope. The results showed that microstructures of PMS coating were very complicated, and distributed in different regions in the coating. The surface layer consisted mainly of cross-shaped primary carbide Fe_3W_3C, herring bone structure(γ-Fe+Fe_3W_3C), black belt around the herring bone structure, and the matrix. The middle layer consisted mainly of coarsened primary carbide dendrite Fe_3W_3C and interdendrite eutectoid (γ-Fe+Fe_3W_3C or FeW_3C). And structures in the bottom layer were fine, and consisted mainly of WC, primary Fe_3W_3C carbide and eutectoid (γ-Fe+Fe_3W_3C or FeW_3C).

关 键 词：等离子熔—喷 WC-17Co涂层 涂层组织结构 

分 类 号：TG148[一般工业技术—材料科学与工程]