摘要
热障涂层作为航空发动机的关键技术,一旦在使用过程中失效将导致严重的后果。然而,热障涂层在使用过程中不可避免地会接触到钙镁铝硅酸盐(CMAS),引发涂层剥落,使高温合金直接暴露在高温燃气中,带来巨大的危险。因此,热障涂层的CMAS侵蚀及防护问题近年来得到了广泛关注。本文在介绍传统氧化钇稳定氧化锆(YSZ)涂层受CMAS侵蚀现状的基础上,明确了CMAS侵蚀YSZ的化学作用过程,阐明了YSZ涂层的失效机制,比较了不同种类CMAS的侵蚀效果,总结了目前热障涂层抵抗CMAS侵蚀的主要方法,并阐述了基于自损型防护原理开展的新型热障涂层材料的CMAS侵蚀行为研究进展,以期为未来航空发动机用热障涂层陶瓷材料的选择和CMAS防护提供有益参考。
b The failure of thermal barrier coatings （TBCs） can lead to serious consequences. Unfortunately, TBCs inevitably contact with calcium-magnesium-alumino silicates （CMAS） in use. The reaction beween TBCs and CMAS at high temperaure would cause the coating peel off and, as a result, the superalloy is directly exposed to the high temperature gas. Thereore, more and more attentions have been paid on the erosion and protection of CMAS for TBCs dueing the past years. Inthis paper, the CMAS corrosion process and the corrsion failure mechanism of traditional YSZ coating were summarized. The erosion effects of different types of CMAS were also compared. Then, the main protective methods for CMAS corrosion were outlined. Finally, CMAS erosion behavior of new TBCs developed based on the self-destructive protection principle was discussed. These newly developments concerning the CMAS corrosion behavior of TBCs would be helpful for the improvement of the corrosion resistance of TBCs and the seclection of new materials used as TBCs for aeroengine in the future.
出处
《现代技术陶瓷》
CAS
2017年第3期159-175,共17页
Advanced Ceramics
关键词
热障涂层
CMAS
涂层失效
稀土锆酸盐
Thermal barrier coatings
CMAS
Failure of coating
Rare-earth zirconates
