Carbon letters

  • Volume 21
  • /
  • Pages.51-60
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  • 2017
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  • 1976-4251(pISSN)
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  • 2233-4998(eISSN)
Korean Carbon Society (한국탄소학회)
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Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber

  • Kim, Jung Dam (Department of Chemical Engineering, Myongji University) ;
  • Roh, Jae-Seung (School of Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Kim, Myung-Soo (Department of Chemical Engineering, Myongji University)
  • Received : 2016.09.01
  • Accepted : 2016.10.01
  • Published : 2017.01.31
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Abstract

Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to $1600^{\circ}C$ to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size ($L_a$) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800 S/cm. However, the variation in the $d_{002}$ spacing and stacking height of the crystallite ($L_c$) showed that the structural order perpendicular to the graphene planes got worse in carbonization temperatures from 800 to $1200^{\circ}C$ probably due to randomization through the process of gas evolution; however, structural ordering eventually occurred at around $1400^{\circ}C$. For the carbonized pitch powder without stabilization, structural ordering perpendicular to the graphene planes occurred at around $800-900^{\circ}C$ indicating that oxygen was inserted during the stabilization process. Additionally, the shear stress that occurred during the melt-blowing process might interfere with the crystallization of the CPF.

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