陶瓷基复合材料环境障涂层研究进展

Research Progress of Environmental Barrier Coatings for Ceramic Matrix Composites

本文阐述了用于陶瓷基复合材料表面防护的环境障涂层的工作机理及选材关键,列举了多种类型环境障涂层的抗氧化性能、高温水氧腐蚀性能、抗CMAS侵蚀性能的测试数据,得出以稀土硅酸盐作为面层的环境障涂层代表了未来环境障涂层发展的方向,稀土硅酸盐热膨胀系数差异造成的环境障涂层内残余应力的产生以及粘结层的氧化是导致涂层过早剥落失效的主要原因等结论,并论述了当前国内EBC涂层的研究发展,以期为未来航空发动机用环境障涂层材料的选择和高温水氧腐蚀的防护提供有益参考。

This paper describes the working principle and material selection of environmental barrier coatings for surface protection of ceramic matrix composites,lists the test data of oxidation resistance,high temperature water oxygen corrosion resistance and CMAS corrosion resistance of various types of environmental barrier coatings,and concludes that the environmental barrier coatings with rare earth silicate as the surface layer represent the development direction of environmental barrier coatings in the future,the residual stress in the environmental barrier coatings caused by the difference of thermal expansion of rare earth silicate and the oxidation of the adhesive layer are the main reasons for the premature spalling failure of the coating.The current research and development of domestic EBCs are discussed,in order to provide a useful reference for the selection of environmental barrier coating materials and the protection of high temperature water oxygen corrosion for the future of aero-engine.