PREFERRED ORIENTATION OF HIGH-PERFORMANCE CARBON-FIBERS

被引:4
作者
HAMADA, T [1 ]
FURUYAMA, M [1 ]
TOMIOKA, T [1 ]
ENDO, M [1 ]
机构
[1] SHINSHU UNIV,FAC ENGN,NAGANO 380,JAPAN
关键词
D O I
10.1557/JMR.1992.2612
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The preferred orientation of polyacrylnitrile (PAN)-based carbon fibers, mesophase pitch-derived carbon fibers, and pitch precursor fibers was studied by using x-ray diffraction technique. The half width at half maximum (HWHM) intensity of the phi scan x-ray diffraction profiles of these fibers was a minimum at around 2-theta = 26-degrees. The result implies that a crystallite with a larger coherence length of crystallite size L(c)(002) is better aligned along the fiber axis than that with a smaller L(c)(002) in these fibers. Further, theta-2-theta scan profiles depending on phi showed that a better aligned crystallite possesses a larger L(c)(002) than a misaligned one. L(c)(002) of a significantly misoriented crystallite remained constant at about 2 nm even after heat-treatment, though L(c)(002) of a well-aligned crystallite was easily changed by heat-treatment for both PAN and pitch-based fibers. The pitch precursor fiber exhibited a clear peak at about 2-theta = 7-degrees in the theta-2-theta profile and unusual phi scan profiles for 2-theta around 7-degrees, which were explained by assuming columnar structures formed by molecule stacking along the c-axis with periodic arrangements of the columns perpendicular to the c-axis. The periodic column stacking structure observed in the pitch precursor fiber was also detected in pitch-based carbon fibers heat-treated at lower temperatures.
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页码:2612 / 2620
页数:9
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