WC-CoCr涂层热震及高温抗氧化性能  

Thermal Shock and High Temperature Oxidation Resistance Properties of WC-CoCr Coating

作　　者：陈江涛 孙万昌[2] 岳江峰 董储蓄 张磊[3] 梅良灿 刘雄博 

机构地区：[1]芜湖新兴铸管有限责任公司,安徽芜湖241002 [2]西安科技大学材料学院,陕西西安710054 [3]中国船舶重工集团公司第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2016年第22期141-144,共4页Hot Working Technology

基　　金：国家自然科学基金(51072162);陕西省科技攻关项目(2014k08-09);陕西省教育厅科研计划项目(12JK0785)

摘　　要：采用超音速火焰喷涂技术在45钢表面制备了WC-CoCr涂层,在空气环境中对涂层进行高温氧化试验和热震试验,借助SEM、XRD和电子天平分别分析了涂层表面的微观形貌、氧化前后产物相组成及涂层增重。结果表明:HVOF制备的WC-CoCr金属涂层的组织致密、孔隙率低。该涂层经600℃静态空气氧化后,在涂层表面生成了CoWO_4、WO_3、Cr_2O_3等氧化产物,这些氧化物可阻止氧化的进一步发展,提高了涂层的抗氧化能力,涂层没有发生剥落。WC-CoCr涂层具有优异的抗氧化和热震性能。WC-CoCr coatings were prepared on 45 steel by HVOF, and the high temperature oxidation test and thermal shock test of the coating in air atmosphere were carried out. The microstrueture, phase of the coating before and after oxidation test and the mass gain of the coating were examined by SEM, XRD and electro balance. The results show that the microstructure of the coating prepared by HVOF is dense and the porosity is low. The surface of the coating after oxidation at 600 ℃ in static air generates the oxidation production of CoWO4,WOa,Cr203. The oxidation product can furtherly hinder the oxidation of the coating, and then, the oxidation resistance properties of the coating improve. The coating does not peel off. WC-CoCr coatings have good oxidation resistance and thermal shock performance.

关 键 词：超音速火焰喷涂 WC-CoCr涂层 抗氧化性能 热震 

分 类 号：TG174.44[金属学及工艺—金属表面处理]