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Hot Corrosion Behavior of Barium Aluminosilicate‐Coated C/SiC Composites at 900°C
Author(s) -
Wang Yiguang,
Wu Yahui,
Cheng Laifei,
Zhang Litong
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03339.x
Subject(s) - materials science , silicon carbide , aluminosilicate , corrosion , composite material , coating , barium , water vapor , carbide , metallurgy , catalysis , chemistry , biochemistry , organic chemistry
Barium aluminosilicates (BAS) were coated on the carbon fiber‐reinforced silicon carbide composites (C/SiC) as environmental barriers. The hot corrosion behavior of the coated composites was studied at 900°C in dry air and water vapor, respectively. The molten Na 2 SO 4 was used as the corrosion reactant. The results indicate that the BAS coatings can effectively block the attack of molten Na 2 SO 4 to C/SiC composites in dry air. However, the coated composites degrade rapidly when exposed to molten Na 2 SO 4 coupled with water vapor. It is found that the BAS is corroded by Na 2 SO 4 melt with the formation of BaSO 4 , resulting in the destruction of BAS structure, which makes the coating lose its protection to the C/SiC composites in water vapor.