| THE STRUCTURES OF SOME MESOPHASE PITCH-BASED CARBON FIBRES |
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| 作者姓名： | M.G.Dobb 郭红 D.J.Johnson |
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| 作者单位： | Textile Physics Laboratory Department of Textile Industries，University of Leeds，LS2 9JT，UK，Textile Physics Laboratory，Department of Textile Industries，University of Leeds，LS2 9JT，UK，Textile Physics Laboratory，Department of Textile Industries，University of Leeds，LS2 9JT，UK |
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| 摘 要： | The macro-and micro-structure of two groups(high modulus and high thermalconductivity)of MP-based carbon fibres were studied using X-ray diffraction,and both scanningand transmission electron microscopy.The dominant macrostructure in cross section is of foldedpseudo-radial layers which have a tendency to form a quasi-uniform domain as the fibre modulusincreases.It is found that high thermal conductivity fibres have both missimg sector and circularcross sections(possessed predominantly by the high modulus fibre group).The microstructuralstudy indicates that apart from the fibre C700,which has a three-dimensional graphite structure,these two groups of carbon fibres all exhibit a turbostratic stacking order.Furthermore it is foundthat the turbostratic stacking thickness as determined from dark-field measurement is much largerthan the classical crystallite thickness L_c as measured from X-ray diffraction.
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THE STRUCTURES OF SOME MESOPHASE PITCH-BASED CARBON FIBRES |
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| M.G.Dobb Guo Hong D.J.Johnson.THE STRUCTURES OF SOME MESOPHASE PITCH-BASED CARBON FIBRES[J].Journal of Donghua University,1993(4). |
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| Authors: | MGDobb Guo Hong DJJohnson |
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| Abstract: | The macro-and micro-structure of two groups(high modulus and high thermal conductivity)of MP-based carbon fibres were studied using X-ray diffraction,and both scanning and transmission electron microscopy.The dominant macrostructure in cross section is of folded pseudo-radial layers which have a tendency to form a quasi-uniform domain as the fibre modulus increases.It is found that high thermal conductivity fibres have both missimg sector and circular cross sections(possessed predominantly by the high modulus fibre group).The microstructural study indicates that apart from the fibre C700,which has a three-dimensional graphite structure, these two groups of carbon fibres all exhibit a turbostratic stacking order.Furthermore it is found that the turbostratic stacking thickness as determined from dark-field measurement is much larger than the classical crystallite thickness L_c as measured from X-ray diffraction. |
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| Keywords: | Mesophase pitch carbon fibre macrostructur microstructurc |
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