MoSi2-IMPROVEDSiCCOATING TO PROTECT CARBON/CARBON COMPOSITES AGAINST OXIDATION

Qiangang Fu, Hui Xue, Hejun Li (), Kezhi Li and Xiaohong Shi
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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

Surface Review and Letters (SRL), 2007, vol. 14, issue 04, 795-799

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.

Keywords: Carbon/carbon composites; coating; oxidation (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010093

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