Oxidation Inhibition Mechanisms in Coated Carbon–Carbon Composites |
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| Authors: | Thomas D. Nixon James D. Cawley |
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| Affiliation: | Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 |
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| Abstract: | The mechanism of oxidation resistance in SiC-coated carbon-carbon composites containing boron-based inhibitors has been investigated using thermodynamic calculations, thermogravimetric analysis, and electron microscopy. A model is developed based on the formation of a volatile B2O2 sub-oxide in the interior of the composite which condenses to B2O3 upon encountering a locally high oxygen partial pressure in coating cracks. The active-to-passive transition for the oxidation of elemental boron has been determined. |
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| Keywords: | inhibition oxidation models carbon-carbon composites coatings |
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