Chapter 12. New High-Temperature Oxide Composite Reinforcement Material: Chrysoberyl
- 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
Whslen, P. J., Narasimhan, D., Gasdaska, C. G., O'Dell, E. W. and Morris, R. C. (1991) New High-Temperature Oxide Composite Reinforcement Material: Chrysoberyl, 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.ch12
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375105
Online ISBN: 9780470313848
The physical and mechanical properties of chrysoberyl, BeAl2O4, have been evaluated to determine its potential as a single crystal reinforcement material for ceramic matrix composites. Chrysoberyl has a lower density, 3.71 g/cm3, and higher stiffness, 469 GPa, than the other leading candidate single crystal oxide materials, sapphire and yttrium aluminum garnet, while having similar thermal properties (thermal expansion and conductivity). The compression creep rates of oriented single crystals of chrysoberyl were measured in a constant load apparatus in the temperature range of 1520°-1820°C. Crystals oriented such that the loading direction was parallel to  did not show any detectable creep after 10 h (detectability limit ∼6.5 × 10−9 s+1) at 1820°C and 280 MPa. Sigmoidal type creep was observed for crystals oriented such that the (100)  slip system would be activated.