Chapter 4. Fully Reversed Bending Fatigue of Si3N4/SiCw and Si3N4 in Different Environments

  1. John B. Wachtman Jr.
  1. T. A. Mäntylä and
  2. P. T. Vuorinen

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch4

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

Mäntylä, T. A. and Vuorinen, P. T. (1994) Fully Reversed Bending Fatigue of Si3N4/SiCw and Si3N4 in Different Environments, 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.ch4

Author Information

  1. Tampere University of Technology, Institute of Materials Science, P.O. Box 589, FIN-33101 Tampere, Finland

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:

  • non-aqueous;
  • microstructures;
  • tension-compression;
  • hot-pressing;
  • degradation

Summary

The fatigue of a silicon nitride and silicon carbide whisker reinforced silicon nitride (10vol% of SiCW) was studied in three different environments; in water, in air and in non-aqueous liquid, cyclohexane. Testing was made with natural flaw distribution. Fatigue mode was sinusoidal fully reversed bending tension-compression with R=-1. These materials showed high fatigue resistance and no clear cyclic fatigue effects could be found, especially in non-aqueous environment. The fatigue of the composite showed slight dependency on the environment indicating that the environment induced growth of the surface flaws may cause the fatigue. This environmental effect was not so clear in the silicon nitride without whiskers.