类表面织构化镍基复合涂层的摩擦磨损性能  

Wear Resistance of a Texture-like Nickel-based Composite Coating

作　　者：张玉福[1,2] 杨贵荣[1] 黄超鹏[1] 宋文明[1,2] 李健[3] 吕晋军[4] 郝远[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,兰州730050 [2]甘肃蓝科高新石化装备股份有限公司,兰州730070 [3]武汉材料保护研究所,武汉430030 [4]西北大学化学与材料科学学院,西安710069

出　　处：《材料研究学报》2015年第9期679-685,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金51205178;甘肃省自然科学基金1208RJZA189资助项目~~

摘　　要：在低碳钢表面添加质量分数为20%的WC和6%的石墨颗粒,采用真空熔覆方法制备出具有类织构切面形貌的镍基合金(Ni0)复合涂层,研究了复合涂层的显微组织形貌及形成机理、相组成以及干摩擦条件下的摩擦磨损性能,并与镍基合金(Ni0)、碳化钨增强镍基合金(Ni0+20%WC)、石墨改性镍基合金(Ni0+6%石墨)三种涂层进行了比较。结果表明,WC呈不连续的三维网状分布在镍基合金基体中,镍基合金主要由基体相γ-Ni,铬化物硬质相CrB、Cr7C3、Cr23C6和共晶相Ni3B、Ni3Si构成;WC和石墨的单独加入都能提高复合涂层的摩擦磨损性能,类织构组织复合熔覆层的摩擦磨损性能优于相同组成的硬质颗粒单独弥散分布的复合熔覆层;在WC和镍基合金基体组成的类织构形貌结构和石墨润滑相的共同影响下,复合涂层比单一镍基合金涂层的耐磨性提高大约9.6倍。A nickel-based （Ni0） composite coating, which was reinforced with 20%WC and 6% graphite particles and has a texture-like section morphology, was fabricated on steel substrate by vacuum cladding technology. Then its microstructure and tribological property under dry friction condition were characterized in comparison with other three coatings （Ni0, Ni0＋20%WC and Ni0＋6% graphite）. The results show that the WC particles evenly distributed in the nickel-based （Ni0） alloy coatings and formed a special 3D reticular microstructure. The Ni-based alloy coating is mainly composed of y-Ni solid solution, hard phases （Cr7C3, Cr23C6, CrB） and eutectic phases （Ni3Si, Ni3B）. The cladd composite coating consisted of Ni0 with WC and graphite particles exhibits the highest wear resistance among the test coatings. The combination of texture-like structure （which was composed of WC particles and nickel base alloy） and graphite lubricant promoted the abrasion resistance of the composite coating by about 9.6 times in comparison to the pure Ni0coating.

关 键 词：材料失效与保护 镍基复合涂层 真空熔覆 类织构 WC 

分 类 号：TH117[机械工程—机械设计及理论]