Original Article
  • Mechanical Properties of C-And Hollow Shaped Pitch-Based Carbon Fibers
  • Young-Seak Lee, Seung-Gon Ryu, Bo-sung Rhee, N. Popovska
  • C형 및 중공형 핏치계 탄소섬유의 기계적 특성
  • 이영석(충남대학교 화학공학과), 유승곤(충남대학교 화학공학과), 이보성(충남대학교 화학공학과), N. Popovska(Erlangen-Nurnberg University)
Abstract
C-and hollow shaped carbon fibers were prepared from heat-treated isotropic pitches through C-and hollow nozzles, respectively. The tensile strength and torsional rigidity of these fibers were studied with variation of shape factor, oxidation time, and CVD time. Tensile strength of the C-and hollow carbon fiber was affected by the oxidation time and the thickness of carbon fiber. The thinner the wall thickness of C-and hollow carbon fiber, the larger the tensile strength. On the other hand, the tensile strength of SiC-coated C-and hollow carbon fibers is decreased with increasing the CVD time, for the adhesion between fiber and coated layer become weak. The torsional rigidities of the C-and hollow carbon fibers were affected by the shape factor of carbon fiber, and the torsional regidities of the hollow shaped carbon fibers were higher than those of the C-shaped carbon fibers in the same shape factor. The torsional rigidity increased with increasing the CVD time, since the frequence of rotating shaft having SiC coated carbon fiber is increased.

C-and hollow shaped carbon fibers were prepared from heat-treated isotropic pitches through C-and hollow nozzles, respectively. The tensile strength and torsional rigidity of these fibers were studied with variation of shape factor, oxidation time, and CVD time. Tensile strength of the C-and hollow carbon fiber was affected by the oxidation time and the thickness of carbon fiber. The thinner the wall thickness of C-and hollow carbon fiber, the larger the tensile strength. On the other hand, the tensile strength of SiC-coated C-and hollow carbon fibers is decreased with increasing the CVD time, for the adhesion between fiber and coated layer become weak. The torsional rigidities of the C-and hollow carbon fibers were affected by the shape factor of carbon fiber, and the torsional regidities of the hollow shaped carbon fibers were higher than those of the C-shaped carbon fibers in the same shape factor. The torsional rigidity increased with increasing the CVD time, since the frequence of rotating shaft having SiC coated carbon fiber is increased.

This Article

  • 1994; 7(3): 43-50

    Published on Jun 30, 1994