Chapter 5. Structure and Properties of Polymer-Derived Stoichiometric SiC Fiber

  1. John B. Wachtman Jr
  1. J. Lipowitz,
  2. J. A. Rabe,
  3. K. T. Nguyen,
  4. L. D. Orr and
  5. R. R. Androl

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch5

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

Lipowitz, J., Rabe, J. A., Nguyen, K. T., Orr, L. D. and Androl, R. R. (1995) Structure and Properties of Polymer-Derived Stoichiometric SiC Fiber, 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.ch5

Author Information

  1. Dow Corning Corporation, Midland, MI 48686

Publication History

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

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

SEARCH

Keywords:

  • beta-silicon;
  • weavable;
  • retention;
  • microstructural;
  • reinforcement

Summary

Beta-silicon carbide fiber is now being prepared in kilogram quantities as long (⩾ 400m) continuous lengths of multifilament tow on spools (⩾500 filaments/tow). This fine diameter (10μm), stoichiometric fiber is highly flexible and weavable, as desired for reinforcement of ceramic matrix composites. The C/Si ratio by elemental analysis is 0.99 ± 0.03. The density of ± 3.1 g/cm3 is more than 96% of theoretical. Average tensile strength and elastic modulus of typical fiber are 2.8 GPa (at 25.4 mm gage length) and 400 GPa, respectively. Average β-SiC crystallite size by Scherrer X-ray line broadening is 60-90 nm, though crystallites up to 500 nm in size are seen by SEM. Strength retention at room temperature after aging at 1550°C in argon for 10 hours is 96%. Fast fracture strength at 1400°C in air is 1.55 GPa (25.4 mm hot zone). Additional microstructural and thermomechanical data is included.