A MoSi2–SiC–Si/MoSi2 COATING TO PROTECT CARBON/CARBON COMPOSITES AGAINST OXIDATION AT 1700°C

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Qian-Gang Fu (fuqiangang@nwpu.edu.cn), He-Jun Li, Yong-Jie Wang, Ke-Zhi Li and Heng Wu
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Surface Review and Letters (SRL), 2009, vol. 16, issue 03, pages 437-440

Abstract: In order to protect carbon/carbon (C/C) composites from oxidation at 1700°C, a MoSi2–SiC–Si/MoSi2 coating was prepared on the surface of these composites by a simple and effective method. The MoSi2–SiC–Si inner layer was obtained by pack cementation, and the MoSi2 outer 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 protect C/C composites 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 the SiO2 film on the coating surface during oxidation.

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