Chapter 20. Speculation on the Creep Behavior of Silicon Carbide Whisker-Reinforced Alumina

  1. John B. Wachtman Jr.
  1. Kimberly Yates Donaldson1,
  2. Anuradha Venkateswaran1,
  3. D. P. H. Hasselman1 and
  4. J. F. Rhodes2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470310588.ch20

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

Donaldson, K. Y., Venkateswaran, A., Hasselman, D. P. H. and Rhodes, J. F. (1989) Speculation on the Creep Behavior of Silicon Carbide Whisker-Reinforced Alumina, 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.ch20

Author Information

  1. 1

    Department of Materials Engineering Virginia Polytechnic Institute and State University Blacksburg, VA

  2. 2

    Advanced Composite Materials Corporation Greer, SC

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:

  • composites;
  • dielectric constant;
  • carbon coatings;
  • boron nitride;
  • crack deflection

Summary

The creep behavior of SiC whisker-reinforced alumina at 1500°C was investigated. The creep strain vs time exhibited typical primary, secondary, and tertiary creep. The initial creep rate in the primary regime exhibited a stress exponent of 1.59, which is typical for single-phase polycrystalline alumina. The apparent stress exponent for secondary (steady-state) creep was found to have a value of 2.88, well in excess of the expected value for creep of the alumina matrix. The presence of the whiskers appeared to suppress cavitation or other damage, thereby eliminating any contribution from elastic creep by crack growth or crack-enhanced creep to the total creep deformation.