复合制备Ni基合金涂层的组织结构及性能演变特征  

Evolution Characteristics of Microstructure of Ni-Based Alloy Coatings and Their Properties under Complex Process

作　　者：杨效田[1] 王鹏春 李霞[2] 路阳[1] 肖荣振[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州交通大学,甘肃兰州730070

出　　处：《稀有金属材料与工程》2017年第3期693-698,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(51165021);国家国际科技合作项目(2013DFR50790);省部共建有色金属先进加工与再利用国家重点实验室资助项目(兰州理工大学)(SKL1301);兰州理工大学博士基金

摘　　要：采用超音速等离子喷涂技术在45#钢基体上制备Ni60合金涂层,对预制的涂层分别进行高频感应重熔和感应重熔+强制冷却处理。借助OM、SEM、XRD、显微硬度计和销盘式摩擦磨损试验机对3种涂层的组织结构、显微硬度分布及摩擦磨损性能进行分析,研究Ni60合金涂层组织结构及其性能的演变特征。结果表明:3种涂层组织结构差异较大,单纯感应重熔涂层使喷涂涂层组织结构细密化,感应重熔+强制冷却的涂层形成了外延型生长的定向晶结构。喷涂涂层硬度自内向外呈明显下降趋势,而后续处理的2种涂层均表现为自内向外略为增加趋势,导致喷涂涂层尽管有较高的平均硬度,但表层硬度低于其他2种涂层。3种涂层均有很好的耐磨性能,但后续处理使涂层的摩擦系数明显增大,耐磨性能显著增强,尤其附加强制冷却的涂层表现出更加优异的耐磨性能,其平均磨损率分别低于喷涂涂层约8.5倍和单纯感应重熔涂层约2倍。Ni60 coatings were prepared by supersonic plasma spraying on 45 # steel substrate, and they were subsequently treated by induction remelting and induction remelting＋forced cooling, separately. The microstructure, microhardness distribution and friction-wear properties of the coatings were analyzed by OM, SEM, XRD, microhardness tester and pin-on-disk friction wear tester to investigate the evolution characteristic of microstructure of Ni60 alloy coatings and their properties. The results indicate that there are great differences in microstructure for the three kinds of coatings. The remelting treatment only by high-frequency induction refines the microstructures of the coating, while the coating remelted by induction remelting＋forced cooling forms directional crystal structure of epitaxial growth. The hardness of the sprayed coating exhibits a downward trend from inside to outside, and the hardness of the other two coatings slightly increases from inside to outside; therefore, despite the high average hardness of the sprayed coating, the surface hardness is lower than that of the other two coatings. The three coatings all have well wear resistance, but subsequent treatment increases the friction coefficient of the coating obviously, and wear-resisting performance is significantly enhanced. Particularly, the coating with forced cooling shows excellent wear resistance, and its average wear rate is lower about 8.5 times than that of the spraying coating and about 2 times than that of the induction remelting coating

关 键 词：感应重熔 强制冷却 NI60涂层 定向晶 摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]