Chapter 30. Effects of Mullite/ Ysz Coatings on the Performance of Sic/ Sic Composite Combustion Liners
- Todd Jessen,
- Ersan Ustundag
Published Online: 28 MAR 2008
DOI: 10.1002/9780470294635.ch30
Copyright © 2000 The American Ceramic Society
Book Title
24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4
Additional Information
How to Cite
Russell, L. C., Sankar, J., Miller, R. A., Zhu, D. and Calomino, A. (2008) Effects of Mullite/ Ysz Coatings on the Performance of Sic/ Sic Composite Combustion Liners, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch30
Publication History
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 2000
Book Series:
ISBN Information
Print ISBN: 9780470375693
Online ISBN: 9780470294635
- Summary
- Chapter
- References
Keywords:
- thermal barrier;
- hygrothermal soaking;
- coating system;
- coefficient of thermal expansion (CTE);
- ceramic composites
Summary
Silicon carbide/ Silicon carbide (SiC/ SiC) woven composites were covered with plasma- sprayed mullite/ ZrO2- 8 wt % Y2O3 coatings. Isothermal soaking in an oxidative environment was used to simulate a combustion environment to determine the feasibility of the corrosive/ thermal barrier coating system and its effects on the flexural behavior of SiC/ SiC 5-harness satin weave composites. The experimental investigation consists of studying the load- displacement behavior of virgin to thermally soaked to coated materials, and understanding the failure mechanisms of SiC/ SiC composites during four- point bend testing. The specimens experienced both high temperature gradients and hygrothermal soaking. The load- displacement data from the laser four- point flexural test demonstrates that the coating ratio 1.5:1 combination outperforms the 0.6:l coating ratio in the mechanical behavior of the composite specimens. The scanning electron microscope micrographs demonstrate that hygrothermal soaking degrades the material, causing a reduction in mechanical strength.