Chapter 22. Failure Characteristics of Low Dielectic Constant Ceramic Composites Reinforced with BN-Coated Fibers

  1. John B. Wachtman Jr.
  1. Jay E. Lane and
  2. Alfred R. Pebler

Published Online: 28 MAR 2008

DOI: 10.1002/9780470310588.ch22

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10

How to Cite

Lane, J. E. and Pebler, A. R. (1989) Failure Characteristics of Low Dielectic Constant Ceramic Composites Reinforced with BN-Coated Fibers, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310588.ch22

Author Information

  1. Westinghouse Research and Development Center 1310 Beulah Road Pittsburgh, PA

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374870

Online ISBN: 9780470310588

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Keywords:

  • thermal shock behavior;
  • ceramic composites;
  • microcracking;
  • heat treatments;
  • thermal protection system

Summary

Composites having low dielectric constant were prepared using a cordierite-based matrix reinforced with Al2O Si-N-C-O, or boron aluminosilicate fibers. Previous experience has shown that these fibers react with the oxide matrix during composite consolidation which leads to brittle composite failure. To prevent this fiber I matrix interaction and to promote non-brittle behavior, a boron nitride coating was applied to the fibers to act as a barrier/debonding layer. The coating was applied via a low temperature borazine decomposition process. BN-coated Al2O3 fiberreinforced composites displayed non-brittle behavior after 4-point tests, whereas BN-coated Si-N-C-O and BN-coated boron aluminosilicate fiber-reinforced composites exhibited brittle behavior.