Modeling the Oxidation Kinetics of Continuous Carbon Fibers in a Ceramic Matrix

A finite difference model has been developed and was used to study the oxidation kinetics of carbon fibers exposed by the presence of a through-thickness matrix crack in a ceramic matrix composite. Air was the environment of interest so that the model could be compared to experimental testing. The l...

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Bibliographic Details
Main Authors: Halbig, Michael C, Cawley, James D
Format: Report
Language:English
Subjects:
CARBON FIBERS
CERAMIC MATRIX COMPOSITES
DIFFUSION COEFFICIENT
FINITE DIFFERENCE THEORY
Laminates and Composite Materials
OXIDATION KINETICS
OXIDATION REDUCTION REACTIONS
PE61102A
Physical Chemistry
REACTION KINETICS
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Summary:A finite difference model has been developed and was used to study the oxidation kinetics of carbon fibers exposed by the presence of a through-thickness matrix crack in a ceramic matrix composite. Air was the environment of interest so that the model could be compared to experimental testing. The limiting steps of diffusion controlled and reaction controlled kinetics were investigated by changing the value of the simulated temperature which, in turn corresponds to a change in the diffusion coefficient and reaction rate constant. The reaction rates for the oxidation of carbon fibers were compared to theoretical values and oxidation trends predicted by the model were compared to experimental trends. Prepared in collaboration with Case Western Reserve Univ., Cleveland, OH. Presented at 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures at Cocoa Beach, FL., on 25-29 Jan 99.