Chapter 43. Synthesis, Characterization, and Tensile Strength of CVI SiC/BN/SiC Composites

  1. John B. Wachtman Jr
  1. Michael A. Kmetz,
  2. John M. Laliberte,
  3. William S. Willis,
  4. Steven L. Suib and
  5. Francis S. Galasso

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch43

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

How to Cite

Kmetz, M. A., Laliberte, J. M., Willis, W. S., Suib, S. L. and Galasso, F. S. (1991) Synthesis, Characterization, and Tensile Strength of CVI SiC/BN/SiC Composites, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313848.ch43

Author Information

  1. Department of Chemistry and Institute of Materials Science University of Connecticut Storrs, CT 06268

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375105

Online ISBN: 9780470313848

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Keywords:

  • composites;
  • ceramic;
  • nitride;
  • homogeneous;
  • methyltrichlorosilane

Summary

Tows of NicalonÅ yarn were first precoated by CVD with amorphous BN, then infiltrated with SiC by CVD to form single strand composites. Two different methods for the preparation of BN were investigated. The first involved the formation of a BCl3.NH3 adduct; the second consisted of the direct reaction of the gases in the hot zone. Tensile strength measurements made on the composites were about 277 MPa (40 ksi) and displayed a considerable amount of fiber pull-out and crack bridging. In order to establish their thermal stability, the ends of the composites were cut exposing the fiber and interface and annealed in air to 1100°C for 70 h. This annealing process did not result in a decrease in tensile strength. The composites were characterized by AES, SEM, and X-ray diffraction analysis.