Chapter 16. Oxygen Diffusion and Reaction Kinetics in Continuous Fiber Ceramic Matrix Composites

  1. Don Bray
  1. Michael C. Halbig1,
  2. Andrew J. Eckel2 and
  3. James D. Cawley3

Published Online: 23 MAR 2010

DOI: 10.1002/9780470294499.ch16

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

How to Cite

Halbig, M. C., Eckel, A. J. and Cawley, J. D. (1998) Oxygen Diffusion and Reaction Kinetics in Continuous Fiber Ceramic Matrix Composites, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294499.ch16

Author Information

  1. 1

    Army Research Laboratory. Vehicle Technology Center, 21000 Brookpark Rd., Cleveland, OH 44135

  2. 2

    NASA Lewis Research Center, 21000 Brookpark Rd., Cleveland, OH 44135

  3. 3

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

Publication History

  1. Published Online: 23 MAR 2010
  2. Published Print: 1 JAN 1998

ISBN Information

Print ISBN: 9780470375594

Online ISBN: 9780470294499

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Keywords:

  • algorithm;
  • tonnage conditions;
  • variation;
  • transient;
  • parameters

Summary

Previous stressed oxidation tests of C/SiC composites at elevated temperatures (350°C to 1500°C) and sustained stresses (69 MPa and 172 MPa) have led to the development of a finite difference cracked matrix model. The times to failure in the experimentally tested samples suggest oxidation kinetics occurred in two regimes defined by tlie rate controlling mechanism (i.e. diffusion controlled and reaction controlled kinetics). Microstructural analysis revealed preferential oxidation along as-fabricated, matrix microcracks and also suggested two regimes of oxidation kinetics dependent on the oxidation temperature. Based on experimental results, observation and theory, a finite difference model was developed. The model simulates the diffusion of oxygen into a matrix crack bridged by carbon fibers. The model facilitates the study of the relative importance temperature, the reaction rate constant. and the diffusion coefficient have on the overall oxidation kinetics.