火焰喷涂镍基复合涂层的干摩擦磨损性能  

Dry Sliding Friction and Wear Behavior of Flame Sprayed Nickel-Based Composite Coatings

作　　者：田雪梅[1] 乔红斌[1] 古绪鹏[1] 杨建国[1] 陈国昌[1] 伊廷锋[1] 

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243002

出　　处：《材料保护》2013年第6期30-32,63,共4页Materials Protection

基　　金：国家自然科学基金(50902001);安徽省高校省级科学研究项目(KJ2013Z016)资助

摘　　要：针对轴套表面耐磨强化需求，为了进一步提高镍基涂层的耐磨性，采用火焰喷涂技术在球磨铸铁表面制备了含不同耐磨添加剂[SiC，WS2，六方BN（h-BN），立方BN（C-Bn），石墨，铜粉]的镍基复合涂层。利用盘-销式磨损试验机测试了基体与复合涂层的干摩擦磨损性能，采用数码显微镜观察了复合涂层表面磨损形貌，并讨论了磨损机制。结果表明：在高载荷下，基体磨损严重，填充耐磨添加剂后，镍基复合涂层在高栽荷下显示出较优的耐磨性能；载荷为20～100N时，涂层磨损量随添加剂类型和添加量显著变化；50N载荷下，含8％Cu，C-BN的镍基复合涂层的耐磨性能较其他复合涂层的更优，其中含c-BN镍基复合涂层的磨损量仅为0．0039mg／（N·m）；100N载荷下，含5％WS2，Cu，h-BN的镍基复合涂层的耐磨性较其他复合涂层的更优；基体的磨损机制主要为疲劳和黏着磨损，镍基复合涂层表现出一定的塑性变形，主要为疲劳磨损。Nickel-based alloy coatings containing wear-resistant additives were prepared on the surface of nodular cast iron by flame spraying.The friction and wear behavior of the nodular cast iron substrate and the Ni-based coatings was examined with a pin-on-disk friction and wear tester.The morphology of worn surfaces was observed with a digital microscope,and the wear mechanism of the Ni-based coatings was discussed.Results indicated that,under heavy load condition,the nodular cast iron substrate was liable to severe wear,and the Ni-based coatings doped with wear-resistant additives showed good wear resistance.In the meantime,the wear mass loss of the Ni-based coatings under a load of 20~100 N significantly varied with varying type and dosage of the additives.Moreover,under dry sliding condition,the nodular cast iron substrate was mainly dominated by fatigue and adhesion wear,and the Ni-based coatings were dominated by fatigue wear,accompanied by a certain degree of plastic deformation.

关 键 词：镍基复合涂层 摩擦磨损 耐磨添加剂 火焰喷涂 磨损机制 

分 类 号：TG174.44[金属学及工艺—金属表面处理]