Chapter 16. Structure and Properties of Sylramic™ Silicon Carbide Fiber—A Polycrystalline, Stoichiometric β-Sic Composition

  1. J. P. Singh
  1. J. Lipowitz1,
  2. J. A. Rabe1,
  3. A. Zangvil2 and
  4. Y. Xu2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch16

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Lipowitz, J., Rabe, J. A., Zangvil, A. and Xu, Y. (1997) Structure and Properties of Sylramic™ Silicon Carbide Fiber—A Polycrystalline, Stoichiometric β-Sic Composition, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch16

Author Information

  1. 1

    Dow Corning Corporation Midland, MI 48686

  2. 2

    Materials Research Laboratory, University of Illinois at Urbana-Champaign Urbana, IL 61801

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • polycrystalline fiber;
  • crystallites;
  • crystalline structure;
  • oxidation kinetics;
  • higher temperature capability

Summary

Silicon carbide fiber is a stoichiometric, submicrometer polycrystalline β-SiC fiber in tow form, which also contains 3 wt% crystalline titanium diboride. The ∼0.05 m̈m TiB2 crystallites are found primarily at triple points of the 0.1 to 0.5 m̈m β-SiC crystallites. The latter contain considerable twinning and stacking faults, leading to an apparent β-SiC crystallite size of 40–60 nm by Scherrer X-ray line broadening. The β-SiC crystallites appear to be free of intergranular phases. Because of its crystalline structure, the 10 m̈m diameter fiber exhibits low creep, high modulus and high thermal and oxidative resistance as well as high strength. The presence of Ti does not adversely affect parabolic oxidation kinetics at 1200°C in air (kp=1.6×10−18m2/s) since a boron-sintered, α-SiC monolithic material shows similar oxidation kinetics.

Properties of this fiber are compared to HI-NICALON™, another small diameter, commercially-available, high performance SiC ceramic product. The SYLRAMIC fiber is found to have a higher temperature capability (∼1400°C) than HI-NICALON ceramic fiber (∼1200°C). SYLRAMIC fiber is available on spools in tow form and as a 5 HS woven cloth.