Microstructureandhigh-temperatureoxidationbehaviorofplasma-sprayedSi/Yb2SiO5environmentalbarriercoatings

被引：0

作者：

Jie XIAO ^{[1
,2
]}

Qiaomu LIU ^{[3
]}

Jingchen LI ^{[1
]}

Hongbo GUO ^{[1
,2
]}

Huibin XU ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Beihang University

[2] Key Laboratory of High-Temperature Structure Materials and Protective Coatings (Ministry of Industry and Information Technology), Beihang University

[3] AEEC Sichuan Gas Turbine Establishment

来源：

Chinese Journal of Aeronautics | 2019年 / 32卷 / 08期

关键词：

Ceramic matrix composite(CMC); Environmental barrier coatings(EBCs); High-temperature oxidation; Plasma spray; Ytterbium silicate;

D O I：

暂无

中图分类号：

V231 [发动机原理]; V258.3 [];

学科分类号：

082502 ; 0805 ; 080502 ;

摘要：

An environmental barrier coating（EBC） consisting of a silicon bond coat and an Yb2-SiO5 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 ℃ and its high-temperature oxidation behavior at 1350 ℃ 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.

引用

页码：1994 / 1999

页数：6

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