Oxidation of Carbon/Carbon through Coating Cracks | Zendy

Nathan Jacobson | Zendy; Don J. Roth | Zendy; Richard W. Rauser | Zendy; James D. Cawley | Zendy; Donald M. Curry | Zendy

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Oxidation of Carbon/Carbon through Coating Cracks

Author(s) -

Nathan Jacobson,

Don J. Roth,

Richard W. Rauser,

James D. Cawley,

Donald M. Curry

Publication year - 2009

Publication title -

ecs transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.235

H-Index - 52

eISSN - 1938-6737

pISSN - 1938-5862

DOI - 10.1149/1.3224749

Subject(s) - carbon fibers , reinforced carbon–carbon , materials science , coating , composite material , pyrolytic carbon , diffusion , pyrolysis , chemical engineering , composite number , thermodynamics , physics , engineering

Reinforced carbon/carbon (RCC) is used to protect the wing leading edge and nose cap of the Space Shuttle Orbiter on re-entry. It is composed of a lay-up of carbon/carbon fabric protected by a SiC conversion coating. Due to the thermal expansion mismatch of the carbon/carbon and the SiC, the SiC cracks on cool-down from the processing temperature. The cracks act as pathways for oxidation of the carbon/carbon. A model for the diffusion controlled oxidation of carbon/carbon through machined slots and cracks is developed and compared to laboratory experiments. A symmetric cylindrical oxidation cavity develops under the slots, confirming diffusion control. Comparison of cross sectional dimensions as a function of oxidation time shows good agreement with the model. A second set of oxidation experiments was done with samples with only the natural craze cracks, using weight loss as an index of oxidation. The agreement of these rates with the model is quite reasonab

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