Chapter 50. Evaluation of Sic/Sic Composites for Heat Exchanger Applications

  1. John B. Wachtman Jr.
  1. V. Parthasarathy1,
  2. B. Harkins1,
  3. W. Beyennann2,
  4. J. Keiser3,
  5. W. Elliot Jr.3 and
  6. M. Ferber3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313954.ch50

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8

How to Cite

Parthasarathy, V., Harkins, B., Beyennann, W., Keiser, J., Elliot, W. and Ferber, M. (1994) Evaluation of Sic/Sic Composites for Heat Exchanger Applications, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313954.ch50

Author Information

  1. 1

    Solar Turbines Incorporated

  2. 2

    Amercom

  3. 3

    Oak Ridge National Laboratories

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375174

Online ISBN: 9780470313954

SEARCH

Keywords:

  • composite;
  • microprobe;
  • carbon;
  • electron;
  • fiber

Summary

Solar Turbines, high pressure heat exchanger (HIPHES) design includes the option of a ceramic fiber composite header. One of the composites under consideration, AMERCOM's SiC - SiC composite was evaluated to see if it would meet design requirements. Composite specimens with and without a protective coating were C-ring strength tested at temperatures ranging from room temperature to 1000°C. The protective coating prevented oxidation of the carbon coating at the fiber-matrix interface. However under a load, that resulted in microcracking the strengths were reduced considerably at temperatures 500°C. The C-ring strength at temperatures 500°C was reduced to almost one/third of it's room temperature strength. At the elevated temperatures, the effects of varying crosshead speeds were very noticeable. Auger microprobe and electron microprobe analyses revealed an absence of carbon at elevated temperatures which appears to cause degradation in the strength of the composites.