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

Authors

  • Yiguang Wang,

    Corresponding author
    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
      †Author to whom correspondence should be addressed. e-mail: wangyiguang@nwpu.edu.cn
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    • *Member, The American Ceramic Society.

  • Yahui Wu,

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
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  • Laifei Cheng,

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
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  • Litong Zhang

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
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  • J. Smialek—contributing editor

†Author to whom correspondence should be addressed. e-mail: wangyiguang@nwpu.edu.cn

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.

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