超音速火焰喷涂微、纳米结构WC-10Co4Cr涂层及其性能  

Properties of micro and nano structured WC-10Co4Cr coatings by HVOF spray

作　　者：陈小明[1,2] 周夏凉[1,2] 吴燕明[1,2] 王莉容[3] 赵坚[3] 毛鹏展[3] 伏利 马红海 赵鹏[3] 

机构地区：[1]水利部产品质量标准研究所,浙江杭州310012 [2]水利机械及其再制造技术浙江省工程实验室,浙江杭州310012 [3]水利部杭州机械设计研究所,浙江杭州310012

出　　处：《金属热处理》2016年第5期52-56,共5页Heat Treatment of Metals

基　　金：水利部国家"948"项目(201218);浙江省科学计划项目(2014C31156);浙江省科学计划项目(2013C31044);杭州市科技发展计划项目(20120433B35)

摘　　要：采用超音速火焰(HVOF)喷涂技术在06Cr13Ni4Mo不锈钢基体上分别制备了微米和纳米结构WC-10Co4Cr涂层。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征和分析了不同结构WC-10Co4Cr涂层的物相组成、微观组织结构,并对涂层的显微硬度、孔隙率、结合强度、抗冲蚀性能进行了对比,探讨了涂层泥沙冲蚀机理。结果表明:HVOF制备的纳米结构WC-10Co4Cr涂层组织致密,孔隙率更低,涂层的显微硬度、结合强度高于微米涂层,冲蚀质量损失量也小于微米涂层;纳米结构细化了涂层晶粒,增强了涂层的显微硬度和韧性,提高了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。Micro and nano structured WC-10Co4Cr coatings were prepared on 06Crl3Ni4Mo stainless steel substrate by HVOF spray. Phase composition and microstructure of the coatings were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The microhardness, porosity, bond strength and erosion resistance of the coatings were compared. Erosion failure mechanism in the sandy stream was tested as well. The result indicates that the microstructure of the nano structured WC-10Co4Cr coating prepared by HOVF are dense with little porosity. Its microhardness and bond strength are higher than that of the micro structured coating. As well, it is found that the nano structured coating exhibits lower erosion mass loss than the micro structured coating. Nano structure refines the grains of the coating which enhances the microhardness and toughness, improves micro-cutting resistance and anti-fatigue spalling properties, and increases 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]