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Preferred orientation of pitch precursor fibers and carbon fibers prepared from isotropic pitch

Published online by Cambridge University Press:  31 January 2011

T. Hamada ,
M. Furuyama ,
T. Tomioka  and
M. Endo
T. Hamada
Affiliation:
Advanced Materials and Technology Research Laboratories, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
M. Furuyama
Affiliation:
Three-D Composites Research Corporation, 2-1-6 Sengen, Tsukuba 305, Japan
T. Tomioka
Affiliation:
Advanced Materials and Technology Research Laboratories, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki 211, Japan
M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan
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Abstract

The preferred orientation of pitch precursor fibers and carbon fibers from an isotropic pitch was studied using x-ray diffraction techniques. The φ scan profile of a pitch precursor fiber was divided into two parts: φ scan-dependent (anisotropic) and φ scan-independent (isotropic) profiles. The half width at half maximum (HWHM) intensity of the anisotropic part became smaller as the pitch viscosity increased during spinning and as the filament diameter decreased. The area ratio of the anisotropic part to the total area increased when spinning at higher pitch viscosities and when making the diameter thinner; no preferred orientation existed for pitch precursor fibers with very large diameters. A thermodynamic model is proposed for the preferred orientation formation when spinning an isotropic pitch. The carbon fiber exhibited no skin-core difference in preferred orientation. A crystallite with a larger crystallite size Lc(002) in the carbon fiber was shown to be better aligned along the fiber axis than that with a smaller Lc(002). Furthermore, a well-aligned crystallite possessed a larger Lc(002) than one that was misaligned. The pitch precursor fiber also exhibited such a correlation between Lc(002) and the preferred orientation, but the correlation was weak.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 5 , May 1992 , pp. 1178 - 1188
Copyright
Copyright © Materials Research Society 1992

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