Preferential distribution and oxidation inhibiting/catalytic effects of boron in carbon fiber reinforced carbon (CFRC) composites |
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Authors: | Young-Jae Lee Hyeok-Jong Joo |
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Affiliation: | a Fuel Science Program, Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA b Department of Polymer Science and Engineering, Chungnam National University, Taejon 305-764, South Korea |
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Abstract: | Two different batches of CFRC composites were prepared in the absence/presence of B with the expectation of increasing oxidation stability and improving the processing compatibility of CFRC composites in commercial applications. The composites were examined to reveal the nature of substitutional B in oxidation, crystallinity and distribution preference in the composites. Substitutional B acts both a catalyst and an inhibitor in carbon oxidation, depending on the content and the extent of carbon burn-off reaction. Crystallinity increases with the incorporation of B, as expected; d002 decreases, and Lc and La increase. Boron prefers to be distributed in the less ordered structure; non-graphitizable PAN-based carbon fibers have higher B contents than graphitizable coal-tar pitch, but processing conditions can change this preference. The incorporation of B in CFRC composites seems to be beneficial for improving the potential ability of the composites in applications by increasing crystallinity and oxidation stability. |
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Keywords: | A. Carbon/carbon composites B. Doping Heat treatment C. Thermal analysis D. Reactivity |
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