Chapter 28. Oxidation Protection of Carbon-Carbon Composites by (B+Si)N Coatings

  1. John B. Wachtman Jr
  1. A. W. Moore1,
  2. M. B. Dowell1,
  3. E. R. Stover2 and
  4. L.D. Bentsen2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch28

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Moore, A. W., Dowell, M. B., Stover, E. R. and Bentsen, L.D. (1995) Oxidation Protection of Carbon-Carbon Composites by (B+Si)N Coatings, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch28

Author Information

  1. 1

    Advanced Ceramics Corp., Cleveland, OH 44101

  2. 2

    BFGoodrich Aerospace, Brecksville, OH 44141

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • aerospace;
  • expansion;
  • nitride;
  • reactor;
  • coaxially

Summary

Dense, crack-free coatings of CVD (B + Si)N protect carbon-carbon composites from static air oxidation at 1S00C for more than 100 hours, and limit carbon losses after more than 80 NASP cycles to 2600F (1427C) to '2 wt. %. Coatings which contain 2 to 35 wt. % Si exhibit thermal expansions <0.32% to 1S00C, and remain well bonded to the substrates, which show expansions 0.18-0.22% to 1800C. Rates of oxidative weight loss of the coating decrease with increasing Si content, but increase with time. Oxidative weight loss rates are decreased 2.5-fold by prior exposure to N2 at 1500C for one hour.