AMoSi2–SiC–Si/MoSi2COATING TO PROTECT CARBON/CARBON COMPOSITES AGAINST OXIDATION AT 1700°C

Qian-Gang Fu (), He-Jun Li, Yong-Jie Wang, Ke-Zhi Li and Heng Wu
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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
Yong-Jie Wang: 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
Heng Wu: 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 03, 437-440

Abstract: In order to protect carbon/carbon(C/C)composites from oxidation at 1700°C, aMoSi2–SiC–Si/MoSi2coating was prepared on the surface of these composites by a simple and effective method. TheMoSi2–SiC–Siinner layer was obtained by pack cementation, and theMoSi2outer layer was prepared by slurry coating using silicon-sol as the caking agent. The microstructures of the as-prepared coating were examined by X-ray diffraction and scanning electron microscope. Oxidation test shows that, the as-received coating can protectC/Ccomposites from oxidation for more than 107 h at 1700°C in air. The excellent anti-oxidation ability of this coating is attributed to its dense structure and the formation of theSiO2film on the coating surface during oxidation.

Keywords: Carbon/carbon composites; coating; oxidation (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012822

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