Chapter 49. Influence of Fiber Content on Mechanical Performance of SiC-Fiber-Reinforced Reaction-Bonded Silicon Nitride Composites

  1. John B. Wachtman Jr
  1. D. Singh1,
  2. J. P. Singh1 and
  3. R. T. Bhatt2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch49

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Singh, D., Singh, J. P. and Bhatt, R. T. (1995) Influence of Fiber Content on Mechanical Performance of SiC-Fiber-Reinforced Reaction-Bonded Silicon Nitride Composites, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch49

Author Information

  1. 1

    Energy Technology Division Argonne National Laboratory, Argonne, IL 60439

  2. 2

    U.S. Army Propulsion Directorate NASA Lewis Research Center Cleveland, OH 44035

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • work-of-fracture;
  • (Sic)-fiber-reinforced;
  • degraded;
  • noncatastrophic;
  • dissipation

Summary

The effect of fiber content on the resulting mechanical properties (first matrix cracking stress, ultimate strength, and work-of-fracture) of silicon carbide (SiC)-fiber-reinforced reaction-bonded silicon nitride (RBSN) matrix composites was investigated. Flexure tests were used to evaluate mechanical properties of composites containing various fiber contents. The first matrix cracking stress, ultimate strength, and work-of-fracture of the composites increased with increasing fiber content, reaching a peak value at a fiber content of =16 vol.%. Further increases in fiber content degraded the mechanical properties of the composites. The variations in mechanical properties with fiber contents were correlated to the residual stresses in the matrix phase, processing related flaws, and failure modes observed in these composites.