Chapter 26. Gelcast Reaction Bonded Silicon Nitride Composites
- John B. Wachtman Jr
Published Online: 28 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
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
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375099
Online ISBN: 9780470313831
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.