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Oxygen diffusion and reaction kinetics in continuous fiber ceramic matrix composites / Michael C. Halbig, Andrew J. Eckel, James D. Cawley.
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- Book
- Conference/Event
- Government document
- Author/Creator:
- Halbig, Michael C., 1969-
- Conference Name:
- Conference on Composites, Advanced Ceramic Materials, and Structures (22nd : 1998 : Cocoa Beach, Fla)
- Series:
- NASA technical memorandum ; 1999-208911.
- ARL-TR (Aberdeen Proving Ground, Md.) ; 1692.
- NASA/TM ; 1999-208911
- ARL-TR ; 1692
- Language:
- English
- Subjects (All):
- Carbon fibers.
- Ceramic-matrix composites.
- Mathematical models.
- Diffusion.
- Oxidation.
- mathematical models.
- diffusion.
- Physical Description:
- 1 online resource (8 pages) : illustrations
- Place of Publication:
- [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, [1999]
- Summary:
- Previous stressed oxidation tests of C/SiC composites at elevated temperatures (350 deg C to 1500 deg 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 samples suggest oxidation occurred in two kinetic regimes defined by the rate controlling mechanisms (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 of temperature, the reaction rate constant, and the diffusion coefficient on the overall oxidation kinetics.
- Notes:
- Title from title screen (viewed on May 2, 2012).
- "February 1999."
- "Prepared for the 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures sponsored by the American Ceramics Society, Cocoa Beach, Florida, January 17-21, 1998."
- Includes bibliographical references (page 8).
- Other Format:
- Microfiche: Halbig, Michael C. Oxygen diffusion and reaction kinetics in continuous fiber ceramic matrix composites
- OCLC:
- 227913302
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