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MoSi2-IMPROVEDSiCCOATING TO PROTECT CARBON/CARBON COMPOSITES AGAINST OXIDATION

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  • QIANGANG FU

    (C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an, 710072, P. R. China)

  • HUI XUE

    (C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an, 710072, P. R. China)

  • HEJUN LI

    (C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an, 710072, P. R. China)

  • KEZHI LI

    (C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an, 710072, P. R. China)

  • XIAOHONG SHI

    (C/C Composites Research Center, Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi'an, 710072, P. R. China)

Abstract

To improve the oxidation protective ability ofSiCcoating for carbon/carbon (C/C) composites,MoSi2was introduced in theSiCcoating by infiltration technique. XRD and SEM analysis show that theSiCcoating obtained by pack cementation is a porous structure with a thickness of about 60–100 μm. After infiltration treatment,MoSi2was filled in the holes of the porousSiC-coating, and the as-received coating becomes dense without through-thickness crack. Oxidation test shows that, the weight loss of theSiC-coatedC/Cis up to 9.23% after 53 h oxidation in air at 1773 K, while the weight loss of theMoSi2-improvedSiC-coatedC/Ccomposites is only 0.73% after oxidation for 265 h. The oxidation ofC/Ccomposites is primarily due to the formation of the penetration cracks and the holes on the glass layer.

Suggested Citation

  • Qiangang Fu & Hui Xue & Hejun Li & Kezhi Li & Xiaohong Shi, 2007. "MoSi2-IMPROVEDSiCCOATING TO PROTECT CARBON/CARBON COMPOSITES AGAINST OXIDATION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 14(04), pages 795-799.
    • Handle: RePEc:wsi:srlxxx:v:14:y:2007:i:04:n:s0218625x07010093
    DOI: 10.1142/S0218625X07010093
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