摘要
为了改善硬质膜层的抗冲蚀性能,采用辉光离子扩渗及等离子增强电弧离子镀技术,在TC4合金表面制备了具有梯度渗碳及TiN(Ti)膜层的复合渗镀层,并分析了结构对于复合渗镀层性能的影响。结果表明,相对于未强化的TC4基体表面单层TiN及12周期复合Ti/TiN膜层,复合渗镀层的显微硬度及膜/基结合强度均得到了提高。冲蚀试验表明,TC4基体未渗碳前,表面单层TiN膜层呈现出脆性冲蚀开裂机制,12层复合Ti/TiN膜层由于多层复合结构的增韧效应,呈现出层状剥落及"冲蚀窝"损伤形貌。渗碳后,复合渗镀层的抗冲击韧性得到提高,单层TiN膜层在冲蚀条件下的膜/基界面脆性开裂明显被抑制。渗碳复合12周期Ti/TiN的复合渗镀层具有最佳的抗固体颗粒冲蚀性能,表现出明显的韧性损伤机制,冲蚀失重率降低了十余倍。抗冲蚀性能的提高可归结于复合渗镀层较高的表面硬度、界面强度和强韧性匹配。
In order to improve the hard coatings’ solid particle erosion(SPE) resistance, combining the plasma ion diffusion and arc ion plating technology, a series of composite coatings with gradient carburized layer and TiN(Ti) coating were synthesized on TC4 alloy. And the influence of structure on composite coating’s properties was studied. The results show that the hardness and bonding strength of composite coatings are enhanced remarkably, compared with those of the monolayer TiN and 12 periods of Ti/TiN hard coatings deposited on TC4 alloy without plasma carburization. The monolayer TiN shows a mechanism of brittle cracking after sand erosion, and the 12 periods of Ti/TiN coating presents morphologies of flaking and erosion pit due to the multilayer toughening effect. After carburization, the coating’s impact toughness is enhanced. The interface fracture of monolayer TiN is restrained. And the composite coating with gradient carburized layer and 12 periods of Ti/TiN coating possesses the best SPE resistance with erosion mass loss rate decreasing by more than ten times and shows a mechanism of tough damage, which can be attributed to its higher interface strength and better match of hardness and toughness.
作者
王彦峰
李争显
杜继红
张长伟
Wang Yanfeng;Li Zhengxian;Du Jihong;Zhang Changwei(Northwest Institute for Nonferrous Metal Research, Xi’an 710016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第6期1878-1883,共6页
Rare Metal Materials and Engineering
基金
科技部中乌国际合作项目(2014DFR50450)
关键词
等离子渗碳
Ti/TiN膜层
固体颗粒冲蚀
多层结构
韧性
plasma carburization
Ti/TiN coating
solid particle erosion
multilayered structure
toughness
