Chapter 11. Creep Behavior of Flexure Beam Specimens of Sic Whisker-Reinforced Composite and Monolithic Silicon Nitrides

  1. John B. Wachtman Jr.
  1. Sung R. Choi1,
  2. Jonathan A. Salem2 and
  3. William A. Sanders2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314180.ch11

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

How to Cite

Choi, S. R., Salem, J. A. and Sanders, W. A. (1993) Creep Behavior of Flexure Beam Specimens of Sic Whisker-Reinforced Composite and Monolithic Silicon Nitrides, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314180.ch11

Author Information

  1. 1

    Cleveland State University, Cleveland, OH 44115

  2. 2

    NASA Lewis Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375266

Online ISBN: 9780470314180

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Keywords:

  • monolithic;
  • microstructure;
  • polynomial;
  • extensometer;
  • morphology

Summary

The creep behavior of a SIC whisker-reinforced (30-vol %) silicon nitride and a similar monolithic silicon nitride was determined In flexure In air at 1250°C. The steady-state creep data were obtained as a function of applied stress from 200 to 370 Mpa. The composite material exhibited higher creep susceptibility as compared to the monolithic counterpart. The appropriateness of bend tests as a means of lifetime prediction methodology was evaluated from the conventional elastic solution based on the curvature measurements and from the neutral axis determinations. This result was also compared with the asymmetric creep behavior shown by other silicon nitride and with the symmetric creep behavior by a stainless steel.