Chapter 20. Effect of Test Temperature, Oxygen Attack, Thermal Transients, and Protective Coatings on Tensile Strength of Silicon Carbide Matrix Composites

  1. John B. Wachtman Jr.
  1. D. A. Woodford1,
  2. D. R. van Steele1,
  3. J. Brehm1 and
  4. J. E. Palko2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313978.ch20

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

How to Cite

Woodford, D. A., van Steele, D. R., Brehm, J. and Palko, J. E. (1994) Effect of Test Temperature, Oxygen Attack, Thermal Transients, and Protective Coatings on Tensile Strength of Silicon Carbide Matrix Composites, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch20

Author Information

  1. 1

    Rensselaer Polytechnic Institute Materials Engineering Department Troy, New York 12180–3590

  2. 2

    General Electric Company Materials and Processes Engineering Schenectady, New York 12345

Publication History

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

ISBN Information

Print ISBN: 9780470375198

Online ISBN: 9780470313978

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Keywords:

  • compositions;
  • fracture energy;
  • dispersion;
  • characterized;
  • conventional

Summary

Tensile strength and elongation are reported for SiC/SiC and SiC/C composites from RT to 1200°C in air. Both composites show reduced fracture resistance at temperatures in excess of 600°C. The SiC/SiC composite is resistant to environmental attack during isothermal and cyclic exposures to 1000°C. However, the SiC/C composite is severely attacked and the C fibers may fully oxidize leading to very low fracture resistance. Protective coatings have no significant effect on SiC/SiC but provide substantial protection for SiC/C. There are indications that the latter system may crack readily as a result of thermal expansion mismatch because even the coated samples degrade on thermal cycling. No correlations were discerned between degree of fiber pullout and fracture resistance.