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January 27th, 2010

Hot Corrosion Behavior of Barium Aluminosilicate-Coated C/SiC Composites at 900°C

Published on January 27th, 2010 | By: pwray@ceramics.org

Volume 93 Issue 1, Pages 204 – 208

 

Yiguang Wang, Yahui Wu, Laifei Cheng, Litong Zhang
Published Online:
Oct 20 2009 1:45PM

DOI: 10.1111/j.1551-2916.2009.03339.x

 

ABSTRACT
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 Na2SO4  was used as the corrosion reactant. The results indicate that the BAS coatings can effectively block the attack of molten Na2SO4  to C/SiC composites in dry air. However, the coated composites degrade rapidly when exposed to molten Na2SO4  coupled with water vapor. It is found that the BAS is corroded by Na2SO4  melt with the formation of BaSO4, resulting in the destruction of BAS structure, which makes the coating lose its protection to the C/SiC composites in water vapor.

Volume 93 Issue 1, Pages 204 – 208

 

Online Access to Journal of the American Ceramic Society


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