Chapter 2. Characterization of Polymer-Derived Silicon Carbide Fibers with Low Oxygen Content. Near-Stoichiometric Composition. and Improved Thermomechanical Stability

  1. John B. Wachtman Jr
  1. M. D. Sacks,
  2. A. A. Morrone,
  3. G. W. Scheiffele and
  4. M. Saleem

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch2

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

Sacks, M. D., Morrone, A. A., Scheiffele, G. W. and Saleem, M. (1995) Characterization of Polymer-Derived Silicon Carbide Fibers with Low Oxygen Content. Near-Stoichiometric Composition. and Improved Thermomechanical Stability, 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.ch2

Author Information

  1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611

Publication History

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

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

SEARCH

Keywords:

  • polymer-derived;
  • diffraction;
  • demonstrate;
  • thermomechanical;
  • carbon-rich

Summary

Polymer-derived SiC fibers with fine diameters (-10-15 μm), high average tensile strengths (∼300-500 ksi), and near-stoichiometric compositions (∼67-70 wt% Si/ ∼30-33 wt% C) were characterized by transmission electron microscopy. Fibers had fine grain sizes (mostly ∼0.1-0.2μm), high densities (∼3.1-3.2 g/cm3), and small residual pore sizes (mostly ∼0.1 μm). SiC grains had a high concentration of stacking faults and twins. Initial observations by high resolution transmission electron microscopy (HRTEM) showed “clean” SiC-SiC grain boundaries. Electron diffraction analyses showed that fibers were primarily cubic beta SiC, with a minor amount of the hexagonal alpha phase. A small amount of graphitic carbon was also detected in some samples using HRTEM. The fibers retained - 93% of their initial strength after heat treatment in argon at 1800°C.