HVOF制备纳米WC-10Co4Cr涂层的微观组织及抗冲蚀性能  

Microstructure and erosion resistance of nanostructured WC-10Co4Cr coating sprayed by HVOF

作　　者：周夏凉[1,2,3] 陈小明 吴燕明[1,2] 赵坚 刘伟[1,4] 毛鹏展 王莉容[1,3] ZHOU Xialiang;CHEN Xiaoming;WU Yanming;ZHAO Jian;LIU Wei;MAO Pengzhan;WANG Lirong(Standard&Quality Control Research Institute,Ministry of Water Resources,Hangzhou 310012,China;Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province,Hangzhou 310012,China;Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province,Hangzhou 310012,China;Hangzhou Mechanical Design Research Institute,Ministry of Water Resources,Hangzhou 310012,China)

机构地区：[1]水利部产品质量标准研究所,杭州310012 [2]浙江省水利水电装备表面工程技术研究重点实验室,杭州310012 [3]水利机械及其再制造技术浙江省工程实验室,杭州310012 [4]水利部杭州机械设计研究所,杭州310012

出　　处：《粉末冶金材料科学与工程》2018年第2期124-129,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：浙江省科技计划项目(2017C37048;2016C37091);杭州市科技发展计划项目(20162231E10)

摘　　要：为提高水轮机表面抗泥沙冲蚀性能,本实验采用超音速火焰喷涂技术(HVOF)在不锈钢(0Cr13Ni5Mo)基体上分别制备微米和纳米结构的WC-10Co4Cr涂层。通过扫描电子显微镜(SEM)分析不同结构WC-10Co4Cr粉末和涂层的微观组织结构,并对涂层的显微硬度、结合强度和抗冲蚀性能进行对比,探讨涂层泥沙冲蚀机理。结果表明:HVOF制备的纳米结构WC-10Co4Cr涂层组织致密,涂层的显微硬度、结合强度高于微米涂层,冲蚀质量损失远小于微米涂层;纳米结构可细化涂层晶粒,增强涂层的显微硬度和韧性,提高涂层的抗微切削和抗疲劳剥落性能,有利于涂层的抗泥沙冲蚀性能。To improve the slurry erosion resistance of turbine surface,nano-structured and micro-structured WC-10Co4Cr coatings were prepared on stainless steel(0Cr13Ni4Mo)surface by HVOF.Microstructure of powders and coatings with different structure were characterized by scanning electron microscopy(SEM).The micro-hardness,bonding strength and erosion resistance were compared.Erosion failure mechanism in the sandy stream was analyzed as well.The results show that the microstructure of nano-structured WC-10Co4Cr coating prepared by HOVF is dense.Its microhardness and bond strength are higher than that of conventional coating.As well,it is found that nano-structured coating exhibits lower erosion mass loss than that of micro-structure coating.Nano-structure coating has finer grains,higher microhardness and toughness,and better micro-cutting resistance and anti-fatigue spalling properties,and can enhance the slurry erosion resistance of the coating.

关 键 词：超音速火焰喷涂 WC-10Co4Cr 微米结构涂层 纳米结构涂层 泥沙冲蚀 

分 类 号：TG174.442[金属学及工艺—金属表面处理]