Chapter 49. The Role of Ambient Gaseous Atmosphere in Thermal Diffusivity Transverse to the Fiber Plane
- 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
Hasselman, D. P. H., Venkateswaran, A., Yu, M. H. and Tawil, H. (1991) The Role of Ambient Gaseous Atmosphere in Thermal Diffusivity Transverse to the Fiber Plane, 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.ch49
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470375105
Online ISBN: 9780470313848
Thermal diffusivity transverse to the fiber plane of alumina and SiC 0/90 multilayer fiber-reinforced CVD-SiC matrix composites was found to decrease when heated to 1500°C. This effect was due to the fiber debonding and matrix cracking parallel to the fiber plane, attributed to the generation of internal stresses due to thermal expansion mismatch and anisotropy for these two composites, respectively, on heating to temperatures above the manufacturing temperature. Prior to heating to 1500°C, thermal diffusivity was found to be independent of the nature of the ambient atmosphere. However, following heating to 1500°C, the thermal diffusivity in vacuum was found to be less than in nitrogen or helium, indicative of the access of the external atmosphere to the debonded interfaces and matrix cracks.