Chapter 5. Fluid-Assisted Fatigue Crack Growth in Si3N4

  1. John B. Wachtman Jr.
  1. Daping Yao and
  2. J. K. Shang

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Yao, D. and Shang, J. K. (1994) Fluid-Assisted Fatigue Crack Growth in Si3N4, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch5

Author Information

  1. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • fluorinated oil;
  • growth kinetics;
  • surface cracks;
  • cyclic loading condition;
  • fatigue crack growth

Summary

Effect of a fluorinated oil on the growth kinetics of surface cracks was examined in a Si3N4 ceramic under cyclic loading condition. Fatigue crack growth in the oil was found to be faster than in humid air. Comparison of fatigue crack surfaces and profiles in the oil and air indicates that the oil has caused the dissolution of Y-containing grain boundary phase. The dissolution reduced the number of bridging grains behind the crack tip, resulting in a higher fatigue crack growth rate in the oil.