Oxidation Kinetics of Pitch Based Carbon Fibers

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 9권 / 2호
ㆍ저자명 : Jae-Seung Roh

목차

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusion
References

한국어 초록

High modulus pitch based carbon fibers (HM) were exposed to isothermal oxidation using tube furnace in carbon dioxide gas to study the oxidation kinetics under the temperature of 800-1100oC. The kinetic equation f=1− exp(−atb) was introduced and the constant b was obtained in the range of 1.02 ~ 1.42. The oxidation kinetics were evaluated by the reaction-controlling
regime (RCR) depending upon the apparent activation energies with the conversion increasing from 0.2 to 0.8. The activation energies decrease from 24.7 to 21.0 kcal/mole with the conversion increasing from 0.2 to 0.8, respectively. According to the RCR, the reaction was limited by more diffusion controlling regime for the HM fibers with the conversion increasing.
Therefore, it seems that the oxidation which is under the diffusion controlling regime takes place continuously from the skin to the core of the fiber.

Keywords : Oxidation, Kinetics, Mechanism, High modulus carbon fiber.

영어 초록

High modulus pitch based carbon fibers (HM) were exposed to isothermal oxidation using tube furnace in carbon dioxide gas to study the oxidation kinetics under the temperature of 800-1100oC. The kinetic equation f=1− exp(−atb) was introduced and 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 activation energies decrease from 24.7 to 21.0 kcal/mole with the conversion increasing from 0.2 to 0.8, respectively. According to the RCR, the reaction was limited by more diffusion controlling regime for the HM fibers with the conversion increasing.Therefore, it seems that the oxidation which is under the diffusion controlling regime takes place continuously from the skin to the core of the fiber.Keywords : Oxidation, Kinetics, Mechanism, High modulus carbon fiber.

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