OXIDATION RESISTANT (Mo,W)Si2 COATING FOR SiC-COATED CARBON/CARBON COMPOSITES BY IN SITU FORMATION METHOD

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Qian-Gang Fu (fuqiangang@nwpu.edu.cn), He-Jun Li, Ke-Zhi Li, Ke Tong and Xi-Yuan Yao
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Surface Review and Letters (SRL), 2009, vol. 16, issue 02, pages 309-313

Abstract: In order to protect carbon/carbon (C/C) composites against oxidation, a (Mo,W)Si2 coating was prepared on the surface of SiC-coated C/C composites by a simple in situ information method using Si, Mo and W as starting materials. The microstructures and oxidation protective ability of the as-received coating were investigated. The results show that the (Mo,W)Si2 outer layer coating containing free Si has a good bonding with SiC inner layer. The as-prepared SiC/(Mo,W)Si2 coating can protect C/C composites 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 glassy SiO2 film on the (Mo,W)Si2 coating 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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