Chapter 73. Creep Behavior of Compositionally Varied Si/SiC Composites

  1. J. P. Singh
  1. Hong Zhou,
  2. James E. Webb and
  3. Raj N. Singh

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch73

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Zhou, H., Webb, J. E. and Singh, R. N. (1997) Creep Behavior of Compositionally Varied Si/SiC Composites, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch73

Author Information

  1. Department of Materials Science and Engineering University of Cincinnati Cincinnati, OH 45221–0012

Publication History

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

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • composites;
  • creep deformation;
  • gas turbine engines;
  • mechanical properties;
  • stress exponents

Summary

The creep behavior of Si/SiC composites containing 10 to 45 vol% Si was investigated. These composites were fabricated using reactive infiltration of molten Si into porous preforms consisting of carbon whiskers and particles as well as SiC particles. Creep deformation was measured using four-point bend tests at temperatures from 1250 to 1550°C and stresses from 60 to 400 MPa. The creep rate was observed to increase with increasing Si content. This increase was particularly sharp in the composites where Si formed a continuous network. Si/SiC composites containing 20 vol% Si and less exhibit excellent creep resistance up to 1550°C. Creep rates as low as 10−10 to 10−9/s were obtained at stresses of 40 to 75% of strengths.