Chapter 9. Polymer-Derived SiC-Based Fibers with High Tensile Strength and Improved Creep Resistance

  1. Don Bray
  1. Michael D. Sacks1,
  2. Gary W. Scheiffele1,
  3. Lan Zhang1,
  4. Yunpeng Yang1 and
  5. John J. Brennan2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294482.ch9

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

How to Cite

Sacks, M. D., Scheiffele, G. W., Zhang, L., Yang, Y. and Brennan, J. J. (1988) Polymer-Derived SiC-Based Fibers with High Tensile Strength and Improved Creep Resistance, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294482.ch9

Author Information

  1. 1

    University of Florida, Gainesville, FL 32611

  2. 2

    United Technologies Research Center, East Hartford, CT 06108

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470375587

Online ISBN: 9780470294482

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Keywords:

  • stoichiometric;
  • temperatures;
  • thermomechanical;
  • polydimethylsilane;
  • hexagonal

Summary

Fine-diameter (∼10–15 μm), polymer-derived, SiC-based fibers with carbon-rich and near-stoichiometric compositions were prepared and characterized. Tensile strengths and creep resistance were evaluated for as-fabricated fibers and for fibers given heat treatments at temperatures up to 1950°C. The creep resistance was assessed using the bend stress relaxation (BSR) method developed by Morscher and DiCarlo. Fibers showed excellent strength retention after heat treatments in argon (for 1 h) at temperatures up to 1700°C for the carbon-rich (“UF”) fibers and up to 1800°C for the near-stoichiometric (“UF-HM”) fibers. Creep resistance of the as-fabricated fibers was greatly improved by high temperature annealing treatments. Heat-treated UF fibers could be prepared with ∼3 GPa tensile strengths and BSR creep behavior which was similar to that reported for Hi-Nicalon™ Type S fibers. Heat-treated UF-HM fibers were also prepared with ∼3 GPa tensile strengths, while BSR results showed that the creep resistance was significantly better than that reported for Hi-Nicalon™ Type S fibers. It was also shown that the UF-HM fibers could be coated with hexagonal BN using an in-situ processing method.