Chapter 45. Improved Interface Coatings for SiC Fibers in Ceramic Composites

  1. John B. Wachtman Jr
  1. A. W. Moore1,
  2. H. Sayir1,
  3. S. C. Fanner2 and
  4. G. N. Morscher2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch45

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., Sayir, H., Fanner, S. C. and Morscher, G. N. (1995) Improved Interface Coatings for SiC Fibers in Ceramic Composites, 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.ch45

Author Information

  1. 1

    Advanced Ceramics Corp., Cleveland, OH 44101

  2. 2

    NASA Lewis Research Center, Cleveland, OH 44135

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:

  • monofilaments;
  • diffraction;
  • pyrolytic;
  • protective;
  • silicon

Summary

Pyrolytic boron nitride with silicon additions, PB(Si)N, was deposited on Textron SCS-0 SiC monofilaments and on Hi-Nicalon11 SiC tow at 1400°C. The PB(Si)N showed 1-3 orders of magnitude greater oxidation resistance than pure PBN at 1200–1500°C and was more resistant to reaction with moisture. X-ray diffraction and EDX showed that the PB(Si)N was glassy and that the silicon and boron were uniformly distributed. The coatings exhibited low thermal expansion, close to that of pure PBN, and showed good debonding characteristics like those of PBN. Tests on single fibers of Hi-Nicalon yarn which were continuously coated with PB(Si)N showed less than 5% strength loss compared with the as-received fibers.