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Oxidation Kinetics of Pitch Based Carbon Fibers

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2008, 9(2), pp.121-126
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

Jae-Seung Roh 1

1Kumoh National Institute of Technology

Candidate

ABSTRACT

High modulus pitch based carbon fibers (HM) were exposed to isothermal oxidation using tube furnace in carbon dioxideoC. The kinetic equation f=1exp(atb) was introducedand the constant b was obtained in the range of 1.02~1.42. The oxidation kinetics were evaluated by the reaction-controllingregime (RCR) depending upon the apparent activation energies with the conversion increasing from 0.2 to 0.8. The activationenergies decrease from 24.7 to 21.0 kcal/mole with the conversion increasing from 0.2 to 0.8, respectively. According to theRCR, the reaction was limited by more difusion controlling regime for the HM fibers with the conversion increasing.to the core of the fiber.

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