Chapter 43. Synthesis, Characterization, and Tensile Strength of CVI SiC/BN/SiC Composites
- John B. Wachtman Jr
Published Online: 26 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375105
Online ISBN: 9780470313848
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.