流れの数値解析と化学装置のモデリング　　ＳｉＣ被覆されたＣ／Ｃコンポジットのメタン‐空気予混合燃焼場中における耐酸化特性

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  • Computation Transport Phenomena in Chemical Engineering. Oxidation Resistance of C/C Composites Coated by SiC in Premixed Methane-Air Combustion.
  • SiC ヒフクサレタ CC コンポジット ノ メタン クウキ ヨコンゴウ ネン

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This paper describes the effects of SiC coating on the oxidation resistance of C/C composites in combusting fields, which are expected to be applied to high temperature structural materials at over 1770 K. The coating methods employed were CVD and pack cementation. The time changes in weight loss of the specimens were measured at temperatures of 1770 K and 1900 K under the equivalence ratio of 0.9 generated by methane-air combustion, and the surface of the specimens before and after the experiment was observed by SEM.<BR>Although the weight loss of the specimens coated by the CVD method was minimal, the coating layer was easily peeled off from the substrate.<BR>On the other hand, the layer of the specimens coated by the pack cementation method was stable and adhered to the substrate, but the substrate was degraded because of penetration of oxygen through the pores in the layer. To cover the pores, the specimens were additionally coated with glass materials comprised of metal-Si, B4C, SiC and ZrSi2. No weight loss occurred for the double-coated specimens, and this coating technique seems to be promising to enable C/C composites to resist oxidation in combusting fields.

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