Microstructure and high-temperature oxidation behavior of plasma-sprayed Si/Yb2SiO5 environmental barrier coatings

被引：33
作者：
Xiao, Jie [1 ,2 ]
Liu, Qiaomu [3 ]
Li, Jingchen [1 ]
Guo, Hongbo [1 ,2 ]
Xu, Huibin [1 ,2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Beihang Univ, Minist Ind & Informat Technol, Key Lab High Temp Struct Mat & Protect Coatings, Beijing 100083, Peoples R China
[3] AEEC Sichuan Gas Turbine Estab, Chengdu 610500, Sichuan, Peoples R China
来源：
CHINESE JOURNAL OF AERONAUTICS | 2019年 / 32卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Ceramic matrix composite (CMC); Environmental barrier coatings (EBCs); High-temperature oxidation; Plasma spray; Ytterbium silicate; RARE-EARTH DISILICATES; MULLITE; COMPOSITES; THERMODYNAMICS; DURABILITY; RESISTANCE; CORROSION; C/C;
D O I：
10.1016/j.cja.2018.09.004
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
An environmental barrier coating (EBC) consisting of a silicon bond coat and an Yb2SiO5 top-coat was sprayed on a carbon fibers reinforced SiC ceramic matrix composite (CMC) by atmospheric plasma spray (APS). The microstructure of the coating annealed at 1300 degrees C and its high-temperature oxidation behavior at 1350 degrees C were investigated. The significant mass loss of silica during the plasma spray process led to the formation of Yb2SiO5 and Yb2O3 binary phases in the top-coat. Eutectics of Yb2SiO5 and Yb2O3 were precipitated in the top-coat, and channel cracks were formed in the top-coat after 20 h annealing because of the mismatch between the coefficients of thermal expansion (CTEs) of Yb2SiO5 and the SiC substrate. The EBC effectively improved the oxidation resistance of the CMC substrate. The channel cracks in the Yb2SiO5 top-coat provided inward diffusion channels for oxygen and led to the formation of oxidation delamination cracks in the bond coat, finally resulting in spallation failure of the coating after 80 h oxidation. (C) 2018 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd.
引用
收藏
页码：1994 / 1999
页数：6
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