Chapter 51. Effect of Fiber Coating on Mechanical Properties of Nicalon Fibers and Nicalon-Fiber/SiC Matrix Composites

  1. John B. Wachtman Jr.
  1. J. P. Singh1,
  2. D. Singh1 and
  3. R. A. Lowden2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch51

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

Singh, J. P., Singh, D. and Lowden, R. A. (1994) Effect of Fiber Coating on Mechanical Properties of Nicalon Fibers and Nicalon-Fiber/SiC Matrix Composites, 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.ch51

Author Information

  1. 1

    Energy Technology Division Argonne National Laboratory, Argonne, IL 60439

  2. 2

    Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge, Tennessee 37831

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:

  • fiber-coating;
  • in-situ;
  • noncatastrophic;
  • work-of-fracture;
  • load-displacement

Summary

The effect of fiber-coating thickness on retained in-situ fiber strength and the resulting mechanical properties of composites was investigated. Flexure tests in a four-point-bend mode were used to evaluate ultimate strength and work-of-fracture of the composites with various fiber-coating thicknesses. Retained in-situ fiber strength in the fractured composites was evaluated by fractographic techniques. Retained in-situ fiber strength, ultimate strength, and work-of-fracture of the composites increased with increasing fiber-coating thickness, reaching a peak value at a coating thickness of =0.3 μm. Further increases in coating thickness did not improve the mechanical properties of either the fibers or the composites. A direct correlation between retained in-situ fiber strength and mechanical properties of the composites suggests that retained in-situ fiber strength has a significant influence on the mechanical properties of composites.