Kinetics and mechanisms of oxidation of 2D woven C/SiC composites; 2: Theoretical approach
- UMR 47, Pessac (France). Lab. des Composites Thermostructuraux
- Societe Europeenne de Propulsion, Saint Medard-en-Jalles (France)
A model for the oxidation kinetics of SiC-coated 2D C/SiC composites is developed on the basis of mechanisms derived from TGA data (between 700 and 1,500 C in dry oxygen or air, P = 100 kPa). Carbon/oxygen reaction, gas phase diffusion through microcracks present in the external SiC coating, and silica growth are the main phenomena taken into account in the modeling. A morphological characterization of the microcracks network based on a compression test and SEM observations has been developed. The differential equations of the model are solved according to an iterative procedure. The mass variations of the composite during an oxidation test, as derived from the model, are in good agreement with the experimental data. The model is then used to predict the oxidation rate variations when (i) the oxygen partial pressure is decreased, and (ii) the state of damage of the external SiC coating is increased by mechanical loading.
- OSTI ID:
- 6987777
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:8; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360604* -- Materials-- Corrosion
Erosion
& Degradation
CARBIDES
CARBON COMPOUNDS
CARBON FIBERS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COATINGS
COMPOSITE MATERIALS
FIBERS
KINETICS
MATERIALS
MATHEMATICAL MODELS
MORPHOLOGY
OXIDATION
PROTECTIVE COATINGS
REACTION KINETICS
SILICON CARBIDES
SILICON COMPOUNDS