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

doi:10.3724/SP.J.1077.2011.00701

Abstract

Abstract: Ba_0.25Sr_0.75Al₂Si₂O₈ (BSAS) as environmental barrier coating (EBC) was coated on the 2D C_f/SiC substrate using slurry-brushing process. The water-vapor corrosion resistance of C_f/SiC and C_f/SiC-BSAS were studied in 50%H₂O-50%O₂ water vapor under atmospheric pressure and static atmosphere at 1250℃, 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℃ 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 C_f/SiC-SiC decreases greatly, while the weight of C_f/SiC-BSAS has no obvious change and the flexural strength retention is over 90% after corroded for 100 h.

Key words: environmental barrier coating, slurry, BSAS, water vapor corrosion

CLC Number:

TB323

LU Lin-Jing, CHENG Lai-Fei, HONG Zhi-Liang, WANG Yi-Guang, ZHANG Li-Tong. Fabrication and Water-vapor Corrosion Resistance of Ba_0.25Sr_0.75Al₂Si₂O₈ Environmental Barrier Coating[J]. Journal of Inorganic Materials, 2011, 26(7): 701-706.

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Fabrication and Water-vapor Corrosion Resistance of Ba_0.25Sr_0.75Al₂Si₂O₈ Environmental Barrier Coating

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