Functionally gradient ceramic coating for carbon–carbon antioxidation protection

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• 作者：Cairo ; C.A.A. ; Gra&ccedil ; a ; M.L.A. ; Silva ; C.R.M. ; Bressiani ; J.C.
• 关键词：Carbon ; Composites ; Corrosion ; Oxidation protection ; SiC coatings
• 刊名：Journal of the European Ceramic Society
• 出版年：2001
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：March, 2001
• 卷：21
• 期：3
• 页码：325-329
• 文件大小：661 K

摘要

Functionally gradient ceramic coating provides an effective antioxidant protection to carbon/carbon composites at intermediate temperatures (below 1000°C) by the formation of a B₂O₃ glass from the oxidation of boron phases. The glass flows and seals the cracks to prevent further oxygen penetration. A protection layer based on SiC, B₄C and Al₈B₄C₇ phases was obtained by carbon conversion of the composite using a pack cementation process with a powder mixture of the ZrB₂–SiC–Al₂O₃ system.