爆炸喷涂法制备亚微米WC-12%Co涂层的研究  

Study of sub-micron WC-12%Co coating deposited by detonation gun spraying

作　　者：刘金炎[1] 张敬国[1] 蒋显亮[1] 

机构地区：[1]中南大学表面与涂层技术研究所,湖南长沙410083

出　　处：《功能材料》2008年第7期1177-1180,共4页Journal of Functional Materials

摘　　要：采用爆炸喷涂法制备了含12%(质量分数)Co亚微米WC涂层,研究了涂层的表面形貌、组织结构、相组成,并与大气等离子体喷涂法制备的涂层进行了比较。研究结果表明,爆炸喷涂法制备的WC-12%Co涂层组织均匀,涂层截面层状结构不明显,粘结相Co发生了熔化,但WC粒子并没有熔化;与传统微米级WC涂层相比,亚微米WC涂层脱碳程度较重,涂层中含有WC相、W2C相、Co相、Co3W3C相以及少量W相,主相仍为WC相。与大气等离子体喷涂法制备的涂层相比,爆炸喷涂法制备的涂层脱碳程度较轻。In this paper sub-micron WC-12%Co coating was deposited by detonation gun spraying. The phase constituent and the microstructure of the coating were studied. The coatings deposited by detonation gun spraying and by air plasma spraying were compared. The experimental results are as follows. The sub-micron WC- 12~Co coating has no obvious layer. WC particles are not melted while Co binder is melted. Compared to the decarburization of conventional coating made from micron-size WC particles, the decarburization of the coating made from submieron-size WC particles is more serious. The constituent phases in the detonation gun sprayedcoating are WC, W2C, Co, Co3W3C and W. The major phase is WC and the minor phase is W. When the two techniques of detonation gun spraying and plasma spraying are compared, detonation gun spraying is favor for reducing decarburization.

关 键 词：WC晶粒大小 爆炸喷涂 脱碳 耐磨涂层 

分 类 号：TG174[金属学及工艺—金属表面处理]