Chapter 44. Behavior of Sic-Fiber/Al2O3 Composite with Na-Based Salts in Dry and Moist Oxidizing Environments

  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.ch44

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) Behavior of Sic-Fiber/Al2O3 Composite with Na-Based Salts in Dry and Moist Oxidizing Environments, 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.ch44

Author Information

  1. Rensselaer Polytechnic Institute, Troy, NY 12180

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:

  • thermogravimetric;
  • oxidative;
  • atmospheres;
  • humidity;
  • mechanical properties

Summary

The current analysis focuses on thermogravimetric and mechanical properties of a SiC fiber-reinforced Al2O3 matrix composite during exposure to oxidative and corrosive environments. Results show a significant weight gain at temperatures above 1000°C in oxygen as well as dry and moist air for times up to 200 hours under stress-free conditions. Below 1000°C an initial weight loss is seen in dry and moist air with no return to the original weight; this behavior is also seen for 1200°C argon exposure. Experiments have also been performed on salt-coated samples (Na2SO4) exposed to similar temperatures and atmospheres. Under these conditions continuous weight loss is observed for times up to 200 hours. Mechanisms of degradation include SiC oxidation and surface spalling. Mechanical properties have been measured following exposure to the same conditions at temperatures below 1000°C. Short-term test results are independent of ambient composition or salt coating. Long-term tests show that static fatigue life is dependent on salt coating, temperature and relative humidity.