高铌TiAl合金表面硅化物涂层的组织结构及其宽温域摩擦学性能  

Microstructure and wide-temperature range tribological properties of silicide coatings on high niobium TiAl alloy

作　　者：李涌泉 郝清锐 王存喜 刘广君 高阳 李轩 LI Yongquan;HAO Qingrui;WANG Cunxi;LIU Guangjun;GAO Yang;LI Xuan(College of Mechatronic Engineering,North Minzu University,Yinchuan 750021,China;School of Material Science&Engineering,North Minzu University,Yinchuan 750021,China;College of Mechanical Engineering,Sichuan University of Science and Engineering,Zigong 643000,China)

机构地区：[1]北方民族大学机电工程学院,银川750021 [2]北方民族大学材料科学与工程学院,银川750021 [3]四川轻化工大学机械工程学院,自贡643000

出　　处：《复合材料学报》2024年第11期6242-6250,共9页Acta Materiae Compositae Sinica

基　　金：北方民族大学中央高校基本科研业务费(2023ZRLG04);国家自然科学基金(52161009);过程装备与控制工程四川省高校重点实验室项目(GK202309);宁夏复合制造系统工程技术研究中心(2023GCJS008)。

摘　　要：为了改善TiAlNb金属间化合物抗氧化耐磨损性能不足的问题,通过扩散渗法在TiAlNb9合金表面制备了双稀土改性的硅化物涂层,并对其微观结构与相组成进行了分析表征,对比研究了TiAlNb9基体和Si-Ce-Y共渗层与WC球在宽温域下的摩擦磨损行为。结果表明:不同催化剂NaF、NH_(4)Cl、AlCl_(3)·6H_(2)O所制备的渗层均具有多层结构,从外到内依次为(Ti,Nb)Si_(2)、(Ti,Nb)_(5)Si_(4)和(Ti,Nb)_(5)Si_(3)外层,(Ti,Nb)_(5)Si_(4)及(Ti,Nb)_(5)Si_(3)中间层,TiAl_(2)内层,催化剂类型对渗层的致密性有显著影响。在实验条件下,Si-Ce-Y共渗层的抗摩擦磨损性能明显优于TiAlNb9基体,TiAlNb9基体在20℃的磨损机制为磨粒磨损和犁削磨损,在600℃下的磨损机制主要为氧化磨损、犁削磨损、磨粒磨损;Si-Ce-Y共渗层在20℃及600℃下的磨损机制相似,均为削层磨损和磨粒磨损。In order to improve the deficient oxidation and wear resistance of TiAlNb intermetallics,a dual rareearth modified silicide coating was prepared on a TiAlNb9 alloy using the pack cementation process.The microstructure and phase composition of the coating were analyzed and characterized,and the friction and wear behavior of the TiAlNb9 substrate and the Si-Ce-Y co-diffused coating against WC balls has been comparatively investigated across a broad temperature range.The results show that the coatings prepared with different activators,including NaF,NH_(4)Cl,and AlCl_(3)·6H_(2)O,have multi-layer structures:From the surface to the interior,the coatings are composed of outer layers of(Ti,Nb)Si_(2),(Ti,Nb)5Si4 and(Ti,Nb)_(5)Si_(3),middle layers of(Ti,Nb)5Si4 and(Ti,Nb)_(5)Si_(3),and the inner layers of TiAl_(2).The activators have imposed a significant impact on the density of the co-diffusion coatings.Under experimental conditions,the friction and wear resistance of the Si-Ce-Y co-diffusion coating are significantly better than those of the TiAlNb9 substrate.The wear mechanisms of the TiAlNb9 substrate at 20℃are abrasive wear and plowing wear,while at 600℃,the main wear mechanisms are oxidational wear,plowing wear,and abrasive wear.The wear mechanisms of the Si-Ce-Y co-diffusion layer at 20℃and 600℃are similar,mainly including delamination wear and abrasive wear.

关 键 词：TiAlNb9合金 Si-Ce-Y共渗 微观组织 磨损率 磨损机制 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TB331[金属学及工艺—金属学]