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Fabrication and Water―vapor Corrosion Resistance of Ba0.25Sr0.75Al2Si2O8 Environmental Barrier Coating

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Author(s): LU Lin-Jing, CHENG Lai-Fei, HONG Zhi-Liang, WANG Yi-Guang, ZHANG Li-Tong

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 701;
Date: 2011;
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Keywords: environmental barrier coating; slurry; BSAS; water vapor corrosion

ABSTRACT
Ba0.25Sr0.75Al2Si2O8 (BSAS) as environmental barrier coating (EBC) was coated on the 2D Cf/SiC substrate using slurry―brushing process. The water―vapor corrosion resistance of Cf/SiC and Cf/SiC―BSAS were studied in 50%H2O―50%O2 water vapor under atmospheric pressure and static atmosphere at 1250¡æ, respectively. The results show that the dense BSAS coating with free cracks can be prepared by slurry―brushing method followed by heat―treatment at 1350¡æ in high purity argon. The coating thickness approximate to 15μm after pasted once, and can reach 50μm after pasted for three times. The weight and flexural strength of Cf/SiC―SiC decreases greatly, while the weight of Cf/SiC―BSAS has no obvious change and the flexural strength retention is over 90% after corroded for 100 h.

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