Chapter 65. Effects of Varying PO2 on Subcritical Crack Growth in Continuous-Fiber Reinforced Ceramic Composites

  1. John B. Wachtman Jr.
  1. C. H. Henager Jr. and
  2. R. H. Jones

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314180.ch65

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

Henager, C. H. and Jones, R. H. (1993) Effects of Varying PO2 on Subcritical Crack Growth in Continuous-Fiber Reinforced Ceramic Composites, 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.ch65

Author Information

  1. Pacific Northwest Laboratory, Battelle Blvd., Richland, WA 99352

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:

  • ceramic matrix;
  • CMC;
  • ceramic composite materials;
  • phenomenon;
  • reinforcements

Summary

Time-dependent crack growth measurements of ceramic composites in varying PO2 environments were conducted on materials consisting of chemical vapor infiltration (CVI) SiC reinforced with Nicalon fibers having C-interfaces. Crack velocities are determined as a function of applied stress intensity and time for varying O2 levels. Results are presented for crack velocity-stress intensity relationships in pure Ar and in Ar plus 2000-, 5000-, 10,000-, and 20,000-ppm O2 atmospheres at 1100°C. A 2D micromechanics model is used to represent the time-dependence of observed crack bridging events and is able to rationalize the observed phenomena.