Chapter 16. Microstructural and Strength Stability of CVD SiC Fibers in Argon Environments

  1. John B. Wachtman Jr
  1. Ramakrishna T. Bhatt1 and
  2. David R. Hull2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch16

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

How to Cite

Bhatt, R. T. and Hull, D. R. (1991) Microstructural and Strength Stability of CVD SiC Fibers in Argon Environments, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313848.ch16

Author Information

  1. 1

    Propulsion Directorate U.S. Army Aviation Research and Technology Activity—AVSCOM Lewis Research Center Cleveland, OH 44135

  2. 2

    NASA Lewis Research Center Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375105

Online ISBN: 9780470313848

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Keywords:

  • stoichwmetric;
  • mechanisms;
  • composites;
  • environments;
  • diameter

Summary

The room temperature tensile strength and microstructure of three types of commercially available chemically vapor deposited silicon carbide fibers were measured after 1, 10 and 100 h heat treatments under argon pressures of 0.1-310 MPa at temperatures to 2100ď. Two types of fiber had carbon-rich surface coatings and the other contained no coating. All three fiber types showed strength degradation beyond 1400ď. Time and temperature of exposure had greater influence on strength degradation than argon pressure. Recrystallization and growth of near-stoichiometric SiC grains appear to be the dominant mechanisms for the strength degradation.