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.

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This Article

  • 1994; 7(3): 43-50

    Published on Jun 30, 1994

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