Chapter 60. Stressed Oxidation of C/SiC Composites

  1. J. P. Singh
  1. Michael C. Halbig1,
  2. David N. Brewer1,
  3. Andrew J. Eckel2 and
  4. James D. Cawley3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch60

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

Halbig, M. C., Brewer, D. N., Eckel, A. J. and Cawley, J. D. (1997) Stressed Oxidation of C/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.ch60

Author Information

  1. 1

    ARL Vehicle Technology Center, 21000 Brookpark RD., Cleveland, OH 44135

  2. 2

    NASA Lewis Research Center, MS 106–1, 21000 Brookpark Rd., Cleveland, OH 44135

  3. 3

    Case Western Reserve University, 10900 Euclid Ave., 500 White Bldg., Cleveland, OH 44106

Publication History

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

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

SEARCH

Keywords:

  • cross-sectional fibers;
  • oxidation testing;
  • room temperature;
  • stressed oxidation;
  • ceramic matrix composites

Summary

Constant load, stressed oxidation testing was performed on T-300 C/SiC composites with a SiC seal coat. Test conditions included temperatures ranging from 350°C to 1500°C at stresses of 69 MPa and 172 MPa (10 and 25 ksi). The coupon subjected to stressed oxidation at 550°C/69 MPa for 25 hours had a room temperature residual strength one-half that of the as-received coupons. The coupon tested at the higher stress and all coupons tested at higher temperatures failed in less than 25 hr. Microstructural analysis of the fracture surfaces, using SEM (scanning electron microscopy), revealed the formation of reduced cross-sectional fibers with pointed tips. Analysis of composite cross-sections show pathways for oxygen ingress. The discussion will focus on fiber/matrix interphase oxidation and debonding as well as the formation and implications of the fiber tip morphology.