Chapter 52. High Temperature Behavior of Salt Coated Nicalon Fiber Reinforced Calcium Aluminosilicate Composite
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4
How to Cite
Wang, S.-W., Kowalik, R. W. and Sands, R. (1994) High Temperature Behavior of Salt Coated Nicalon Fiber Reinforced Calcium Aluminosilicate Composite, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch52
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375327
Online ISBN: 9780470314500
- matrix cracking;
- clip-on extensometer
The effects of molten salt (sodium sulfate) on the high temperature mechanical behavior of Nicalon SiC fiber reinforced calcium aluminosilicate are investigated in this study. Tensile specimens were coated with sodium sulfate and exposed at 900°C for 100 hours and then tested at 900°C. It has been shown that the strength of the composite was reduced due to salt induced oxidation embrittlement. The synergistic effect of matrix cracking and hot corrosion was also investigated. Strength was dramatically decreased in specimens which were preloaded and then exposed at elevated temperature. However, specimens which were preloaded prior to the hot corrosion exposure retained more of their strength than the specimens which experienced the same preload and heat-treatment with no salt. Possible degradation mechanisms of these specimens are discussed.