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

Qian-Gang Fu (), He-Jun Li, Ke-Zhi Li, Ke Tong and Xi-Yuan Yao
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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

Surface Review and Letters (SRL), 2009, vol. 16, issue 02, 309-313

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.

Keywords: Carbon/carbon composites; coating; oxidation (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012640

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