Chapter 26. Gelcast Reaction Bonded Silicon Nitride Composites

  1. John B. Wachtman Jr
  1. O. O. Omatete,
  2. T. N. Tiegs and
  3. A. C. Young

Published Online: 28 MAR 2008

DOI: 10.1002/9780470313831.ch26

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8

How to Cite

Omatete, O. O., Tiegs, T. N. and Young, A. C. (1991) Gelcast Reaction Bonded Silicon Nitride Composites, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313831.ch26

Author Information

  1. Oak Ridge National Laboratory Oak Ridge, TN 37831

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375099

Online ISBN: 9780470313831

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Keywords:

  • microwave;
  • ceramic;
  • polymer;
  • monolithic;
  • nitrogen

Summary

Nicalon fiber-reinforced, reaction bonded silicon nitride (RBSN) composites were made by gelcasting green bodies of Si and fibers and nitriding the composites in a 2.45 GHz microwave furnace. The bodies were prepared by casting a 48 vol% slurry of silicon into a mold containing unidirectional fibers cut to the length of the mold. The extent of nitridation and the properties of the reaction bonded silicon nitride composites were measured. Fracture surfaces of the composites processed at 1250°C for 8 h showed significant fiber pull-out; however, those nitrided at 1350°C for 4 h exhibited only limited fiber pull-out indicating possibly some degree of fiber degradation and strong matrix-fiber bonding.