HVOF喷涂纳米结构WC-12Co涂层的组织结构分析  

Microstructural Analysis of Nanostructured WC-12Co Coatings Sprayed by HVOF

作　　者：赵辉[1] 王群[2] 丁彰雄[1] 张云乾[1] 

机构地区：[1]武汉理工大学能源与动力工程学院,湖北武汉430063 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《表面技术》2007年第4期1-3,14,共4页Surface Technology

基　　金：国家自然科学基金资助项目(50479016)

摘　　要：纳米结构WC-12Co涂层的研究目前已受到了广泛重视,对其组织结构及影响因素的研究有利于提高涂层性能。采用HVOF工艺制备了纳米结构、多峰结构及普通微米结构3种WC-12Co金属陶瓷复合涂层,并采用SEM、XRD等对粉末及涂层的显微形貌、组织结构进行了分析;探讨了粉末在喷涂过程中的氧化脱碳机理,并指出了与之相关的影响因素。结果表明:纳米结构WC-12Co涂层结构致密,孔隙率低,与基体结合状态良好;纳米粉末在喷涂过程中比微米粉末氧化失碳严重,并发生了不同的纳米晶粒的长大;纳米粉末在喷涂过程中的氧化脱碳程度不仅与喷涂工艺有关,还在很大程度上取决于粉末本身的结构特性。Research on nanostructured WC-12Co coatings has been emphasized nowadays, and study on coating microstructure and the influencing factors is beneficial to enhance the coating properties. Nanostructured, multimodal and conventional WC-12Co ceramic coatings were deposited by high velocity oxy-fuel spray （ HVOF） and the structures of the coatings such as microstructures and phase compositions were analyzed by SEM and XRD. Finally the mechanisms and factors of decarburization of WC particles in spraying were explored. Research results show that microstructures of nanostructural and multimodal WC-12Co coatings deposited by HVOF are dense, better adhesive strength and little porosity than conventional one. As well, it is found that although obvious decarburization of WC and crystal size growth occurred during spraying multimodal and nanostructured WC-12Co powders in comparison with conventional coating, the decarburization of WC for the nanostructured powder is more severe because of the increasement in nano size WC amount, and the decarburization degree of nanostructured WC-Co is not only influenced by spray parameters, but also depended on the powder structure characteristics.

关 键 词：HVOF 纳米结构涂层 陶瓷涂层 WC-12CO 组织结构 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG174.453[金属学及工艺—金属学]