Chapter 42. Failure Mechanisms of 3-D Woven Sic/Sic Composites Under Tensile and Flexural Loading at Room and Elevated Temperatures
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramic Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8
How to Cite
Chulya, A., Gyekenyesi, J. Z. and Gyekenyesi, J. P. (1994) Failure Mechanisms of 3-D Woven Sic/Sic Composites Under Tensile and Flexural Loading at Room and Elevated Temperatures, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313954.ch42
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375174
Online ISBN: 9780470313954
Nicalon silicon carbide 3D yam with silicon carbide matrix composites made through a chemical vapor infiltration (CVI) process were investigated under tensile and flexural loading at 23, 1200 and 1550°C in air. The effectiveness of a chemical vapor deposition (CVD) SiC surface coating was also evaluated in severe oxidizing environment. Acoustic emission sensors and in-situ optical microscopy were used at room temperature to monitor the failure mechanisms. It is shown that the level of tensile stress at which nonlinear behavior begins is not drastically reduced at 1200 and 1550°C when composites were protected by a SiC surface coating. Extensive fiber pull-out was observed only in the 1550°C specimen. Similar behaviors were also found in flexural specimens.