Chapter 36. High Temperature Fracture Mechanisms in Alkoxide-Derived Mullite/ZrO2/SiC-Whisker Composites
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10
How to Cite
Xu, Y., Zangvil, A. and Ruh, R. (1993) High Temperature Fracture Mechanisms in Alkoxide-Derived Mullite/ZrO2/SiC-Whisker Composites, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch36
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
- electron microscopy;
Room and high temperature (1250°C) mechanical properties of a series of hot-pressed alkoxide-derived mullite-based composites with partially stabilized ZrO2(PSZ) and SiC whiskers (SiCw) have been measured. The morphology of fracture surfaces as well as near-fracture surface microstructures of these materials has been characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The SiCw aided the high temperature strength considerably, but the addition of a MgO or Y2O3stabilizer caused a transition from transcrystalline to intercrystalline fracture at 1250°C and a slow crack growth at low stress levels, resulting in poor high-temperature strength.