Water vapor corrosion behavior and failure mechanism of air sprayed bi-layer Yb2Si2O7/SiC and tri-layer Yb2Si2O7/ (SiCw-Mullite)/SiC environmental barrier coating

Pengju Chen; Peng Xiao; Zhuan Li; Yichen Wang; Xian Tang; Yang Li

Advanced Powder Materials (Jan 2023)

Water vapor corrosion behavior and failure mechanism of air sprayed bi-layer Yb2Si2O7/SiC and tri-layer Yb2Si2O7/ (SiCw-Mullite)/SiC environmental barrier coating

Pengju Chen,
Peng Xiao,
Zhuan Li,
Yichen Wang,
Xian Tang,
Yang Li

Affiliations

Pengju Chen: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Peng Xiao: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Zhuan Li: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Corresponding author. Powder Metallurgy Research Institute, Central South University, No.932 Lushan South road, Changsha 410083, China.
Yichen Wang: School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
Xian Tang: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Yang Li: National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China; Corresponding author. Powder Metallurgy Research Institute, Central South University, No.932 Lushan South road, Changsha 410083, China.

Journal volume & issue: Vol. 2, no. 1
p. 100064

Abstract

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To improve the corrosion resistance of Cf/SiC composites in a water vapor oxygen coupled environment, the bi-layer Yb2Si2O7/SiC and tri-layer Yb2Si2O7/(SiCw-Mullite, SM)/SiC environment barrier coatings were designed and prepared on the surface of Cf/SiC composites by chemical vapor deposition and sol-gel method united with air spraying. Results show that the mass loss of bi-layer Yb2Si2O7/SiC coating coated samples was 17.24 × 10−3 g cm−2 after 200 h oxidation at 1673 K, and the average compression strength retention rate was only 79.44% due to the formation of wide penetrating cracks. Comparatively, SiC whiskers in SM middle coating can not only increase the crack propagation resistance of mullite middle coating, but also alleviate the difference of coefficient of thermal expansion between Yb2Si2O7 outer coating and mullite middle coating. Therefore, the mass loss of tri-layer Yb2Si2O7/SM/SiC coating coated samples was only 2.93 × 10−3 g cm−2 after 200 h oxidation at 1673 K, and the average compression strength retention rate was up to 98.79%.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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