Journal
CARBON
Volume 40, Issue 12, Pages 2109-2116Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(02)00060-X
Keywords
carbon filaments; scanning electron microscopy; X-ray diffraction; Raman spectroscopy; transport properties
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Large diameter carbon fibres of 15-60 mum were produced from naphthalene-derived mesophase pitch. In the as-spun state, preferred orientation increases with fibre diameter, confirming a previous study. However, the sheath-core structure that develops during carbonisation of large diameter fibres results in a decrease in preferred orientation. As a consequence, the strength, modulus and electrical resistivity also decrease. The coarse optical texture of the partially relaxed core allows a higher degree of graphitisation. With extended stabilisation, the core can be eliminated and the mechanical properties improve whilst the electrical resistivity increases. (C) 2002 Elsevier Science Ltd. All rights reserved.
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