Chapter 51. “Inert” Strengths of Silicon Nitride Ceramics at Elevated Temperatures

  1. John B. Wachtman Jr.
  1. Sung R. Choi and
  2. Jonathan A. Salem

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch51

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Choi, S. R. and Salem, J. A. (1996) “Inert” Strengths of Silicon Nitride Ceramics at Elevated Temperatures, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch51

Author Information

  1. Cleveland State University, Cleveland, OH 44115

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • stressing;
  • ceramic material;
  • determination;
  • normalized;
  • analytical solution

Summary

An attempt to determine high temperature “inert” strengths of several silicon nitride ceramics was made by using dynamic fatigue testing at the very high stressing rate of 2 × 10 MPa/min. The fatigue strengths of all the silicon nitride materials exhibited a well-defined convergence to the corresponding room-temperature inert strengths as stressing rate was increased. The result showed that the high temperature “inert” strength of a ceramic material can be obtained by using sufficiently high stressing rates (⩾ 2 × 106 MPa/min) at which fatigue strength converges to a specific value. The specific value can be close to the room-temperature strength of the material.