Chapter 30. Effects of Mullite/ Ysz Coatings on the Performance of Sic/ Sic Composite Combustion Liners

  1. Todd Jessen and
  2. Ersan Ustundag
  1. L. C. Russell1,
  2. J. Sankar1,
  3. R. A. Miller2,
  4. D. Zhu2 and
  5. A. Calomino2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch30

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

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

Author Information

  1. 1

    NSF- Center for Advanced Materials & Smart Structures North Carolina A&T State University Greensboro. NC 27411

  2. 2

    NASA Glenn Research Center Cleveland, OH 44135

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

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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.