Chapter 17. The Effect of Ceramic Fiber Coatings on the Room Temperature Mechanical Behavior of Ceramic-Fiber Composites

  1. William Smothers
  1. R. W. Rice,
  2. J. R. Spann,
  3. D. Lewis and
  4. W. Coblenz

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320228.ch17

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

How to Cite

Rice, R. W., Spann, J. R., Lewis, D. and Coblenz, W. (1984) The Effect of Ceramic Fiber Coatings on the Room Temperature Mechanical Behavior of Ceramic-Fiber Composites, in Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320228.ch17

Author Information

  1. Naval Research Laboratory Washington, D.C. 20375

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1984

ISBN Information

Print ISBN: 9780470374139

Online ISBN: 9780470320228

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Keywords:

  • ceramic-fiber composites;
  • scanning electron microscopy;
  • polymer pyrolysis;
  • fiber coating;
  • fiber-matrix bonding

Summary

The effect of a thin (typically 0.1–0.2 m̈m) coating on different fibers was investigated in various composites using different matrices and processes. The coating was selected to limit fiber-matrix bonding. Beneficial results were found on both strength and toughness as a result of coating SiC and Al2O3 fibers in various matrices. Generally, the stronger the fiber-matrix bonding without the coating, the greater its benefit on mechanical behavior; e.g., use of coated SiC fibers in a SiO2 matrix resulted in a four-fold increase in strength and changed the failure from brittle to tough (about a 100-fold increase in toughness base as indicated by areas under the load-deflection curves). Use of the coating resulted in retaining somewhat better mechanical properties after high temperature e.g., 1000°C) oxidation exposure of some composites.