Chapter 43. Effect of Salt Corrosion on Mechanical Properties of a Sic-Sic Composite in Dry and Moist High-Temperature Environment

  1. J. P. Singh
  1. P. Lipetzky,
  2. M. Lieblich,
  3. W. Hillig and
  4. D. Duquette

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch43

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Lipetzky, P., Lieblich, M., Hillig, W. and Duquette, D. (2008) Effect of Salt Corrosion on Mechanical Properties of a Sic-Sic Composite in Dry and Moist High-Temperature Environment, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch43

Author Information

  1. Rensselaer Polytechnic Institute, Troy, NY 12180; 518-276-8374

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • mechanical;
  • oxidizing;
  • detrimental;
  • degradation;
  • investigation

Summary

Oxidation and hot-corrosion effects on the mechanical and physical properties of SiC fiber-reinforced SiC have been studied under both short- and long-term exposure to dry air, argon, oxygen and water vapor up to temperatures of 1200°C. Results in all ambients show a rapid initial weight loss followed by various degrees of weight gain for times up to 20 hours. Hot corrosion studies utilize thin surface coatings of Na2SO4 and NaCl. Samples exhibit a steady weight loss under these conditions which surpasses the weight loss observed during similar oxidation tests. Salt-coated samples were also exposed to moist ambients; water vapor was seen to rapidly accelerate weight loss. Mechanical properties are also reported from static fatigue tests in oxidizing and corrosive environments. It is seen that the conditions which promote weight loss are not necessarily detrimental to specimen life due to the protective coating. Finally, it is seen that minor loss or cracking of the protective surface layer can significantly shorten the life.