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Polymer-Derived SiOC–barium–strontium aluminosilicate Coatings as an Environmental Barrier for C/SiC Composites

Authors

  • Jia Liu,

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

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China
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  • Qiaomu Liu,

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

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China
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  • Yiguang Wang

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


  • R. Riedel—contributing editor

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

Abstract

Polysiloxanes polymer coatings were formed on carbon fiber-reinforced silicon carbide (C/SiC) composites at 100°C in air with barium–strontium aluminosilicate (BSAS) as fillers. After the polymeric coatings were pyrolyzed at 1350°C under argon, a dense SiOC–BSAS-coated C/SiC composite was obtained. The oxidation test in dry air and the corrosion test in water vapor were carried out on the coated composites at 1250°C, respectively. The results indicated that the polymer-derived SiOC–BSAS coatings could protect the C/SiC composites well both in dry air and water vapor. Even after corroded for 200 h in water vapor, the coated C/SiC composites showed little weight loss and high residual flexural strength.

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