Chapter 32. Thermodynamics of Hot Corrosion of SiC/CAS Composite

  1. John B. Wachtman Jr.
  1. R. W. Kowalik1,
  2. S-W. Wang1,
  3. P. D. Ownby2,
  4. D. M. Thompson3 and
  5. W. T. Thompson4

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch32

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Kowalik, R. W., Wang, S.-W., Ownby, P. D., Thompson, D. M. and Thompson, W. T. (1995) Thermodynamics of Hot Corrosion of SiC/CAS Composite, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch32

Author Information

  1. 1

    Naval Air Warfare Center, Warminster, PA

  2. 2

    University of Missouri-Rolla, Rolla, MO

  3. 3

    Queens University, Kingston, Ontario, Canada

  4. 4

    Royal Military College of Canada, Kingston, Ontario

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • methodology;
  • contamination;
  • laboratory-scale separations;
  • magnetic force;
  • minerals processors

Summary

An investigation was undertaken to determine the potential benefits of utilizing a thermodynamic data base as a tool in characterizing the hot corrosion process of a ceramic matrix composite (CMC). The most stable products were determined by an iterative process which calculated the Gibbs free energy of the system. The computations considered all of the elements and potential compounds which pertained to the hot corrosion of a calcium aluminosilicate (CAS) system. Calcium Aluminosilicate was examined both as a monolithic and as a composite material with silicon carbide (SiC) reinforcement. The hot corrosion exposure consisted of a sodium sulfate (Na2SO4) coated specimen at 900°C in air for varying lengths of time. The results from the experimental study were compared to thermodynamic predictions for the system. Both the theoretical model and experimental results supported similar findings when comparing the monolithic material. However, the complexity of the hot corrosion process is enhanced with the introduction of SiC fibers, and the thermodynamic computations did not accurately predict the product phases after exposure.