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OXIDATION RESISTANT(Mo,W)Si2COATING FORSiC-COATED CARBON/CARBON COMPOSITES BYIN SITUFORMATION METHOD

Author

Listed:
  • QIAN-GANG FU

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

  • HE-JUN LI

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

  • KE-ZHI LI

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

  • KE TONG

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

  • XI-YUAN YAO

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

Abstract

In order to protect carbon/carbon (C/C) composites against oxidation, a(Mo,W)Si2coating was prepared on the surface ofSiC-coatedC/Ccomposites by a simplein situinformation method usingSi,MoandWas starting materials. The microstructures and oxidation protective ability of the as-received coating were investigated. The results show that the(Mo,W)Si2outer layer coating containing freeSihas a good bonding withSiCinner layer. The as-preparedSiC/(Mo,W)Si2coating can protectC/Ccomposites from oxidation in air at 1773 K for 252 h with a weight gain of 1.56 wt.%. The excellent oxidation resistant property of the double-layer coating is attributed to its dense microstructure and the formation of the stable glassySiO2film on the(Mo,W)Si2coating surface during its exposure to air at high temperatures.

Suggested Citation

  • Qian-Gang Fu & He-Jun Li & Ke-Zhi Li & Ke Tong & Xi-Yuan Yao, 2009. "OXIDATION RESISTANT(Mo,W)Si2COATING FORSiC-COATED CARBON/CARBON COMPOSITES BYIN SITUFORMATION METHOD," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 16(02), pages 309-313.
    • Handle: RePEc:wsi:srlxxx:v:16:y:2009:i:02:n:s0218625x09012640
    DOI: 10.1142/S0218625X09012640
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