Chapter 34. Layered BN-Coated / As-Received Unidirectional Fiber CFCCs with Enhanced Mechanical Performance

  1. John B. Wachtman Jr.
  1. Todd L. Jessen and
  2. Barry A. Bender

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch34

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

How to Cite

Jessen, T. L. and Bender, B. A. (1994) Layered BN-Coated / As-Received Unidirectional Fiber CFCCs with Enhanced Mechanical Performance, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch34

Author Information

  1. U.S. Naval Research Laboratory Washington, D.C. 20375-5343

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375327

Online ISBN: 9780470314500

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Keywords:

  • work-of-fracture;
  • non-catastrophic;
  • distinguishable;
  • BN-coated;
  • lengthwise

Summary

Unidirectional fiber composites were prepared which contained distinct regions of both uncoated and BN-coated Nicalon fibers. Ultimate strength results show that composites with only 20% of their fiber content having a BN debond coating had equivalent results to composites with 100% BN-coated fibers. Work-of-fracture results varied with respect to BN-coated fiber location in the composite but some arrangements had a 70% improvement, when compared with the 100% BN-coated fiber control group. Properties and fracture mechanisms were found to be dependent on whether crack initiation or crack propagation occurred in the BN-coated fiber segment of the composite.