摘要
硅基非氧化物陶瓷SiC、Si3N4是最有可能取代镍基高温合金作为在更高温度下发动机热端部件中使用的高温结构材料,制约其应用的重要因素是其在发动机工作环境中的表面稳定性不足,硅基非氧化物陶瓷能够和水蒸汽等反应生成挥发性的产物造成陶瓷表面结构退化、尺寸减小。解决这一问题的方法是在硅基非氧化物陶瓷表面涂敷或沉积环境障涂层,通过涂层阻止腐蚀性气氛和陶瓷基体的接触,提高陶瓷基体的表面稳定性。本文回顾了环境障涂层的发展历史,并重点对多种先后发展起来的环境障涂层体系的性能进行了介绍和评价。
Non-oxide silicon-based ceramics （NOSBC） such as silicon nitride （Si3N4 ） or silicon carbide （SiC） are the leading candidates to displace Ni-based superalloys for high temperature structural components in the next generation gas turbine engines. One key stumble block for such an application is NOSBC＇s deficiency in environmental durability. The protective silica scale on the NOSBC＇s surface can react with water vapor, which lead to the formation of a gas state Si（OH） 4 specie. The environmental barrier coatings （EBCs） outside the NOSBC can prevent the substrate from the vapor and improve the substrate＇s environmental durability greatly. In this paper the process of EBCs development was reviewed and the advantages and disadvantages of several EBCs were discussed.
出处
《失效分析与预防》
2007年第1期59-64,共6页
Failure Analysis and Prevention
关键词
环境障涂层
硅基结构陶瓷
高温结构材料
environmental barrier coatings
Si-based ceramics
high temperature structural material
