Patent ID: 6303096
Filing Date: 2001-10-16
Classification: D01F

Abstract:
A pitch based carbon fiber in which the spread La of graphite crystallites which constitute the fiber in the direction of the layer plane is 1000 angstroms or less, the orientation angle .PSI. (in degrees) in the direction of the fiber axis is 10.degree. or less, and the following relationships (3) and (4) are satisfied:0.70La-46.PSI.>120 (3)0.55La-76.PSI.<350 (4),wherein, when a tow is formed by pitch based carbon fibers, the proportion of fibers having cracks in a cross-sectional surface of fibers is 20% or less, and wherein the tensile strength is 330 kg/mm.sup.2 or more, and the compression strength is 33 kg/mm.sup.2 or more.