Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Structural Changes during Oxidation Process of Anisotopic Mesophase Carbon Fibers(II)-Surface Texture Observation by Scanning Electron Microscopy

산화반응에 의한 이방성 메조페이스 탄소섬유의 구조 변화(II)-주사전자현미경을 이용한 표면구조 관찰

  • Roh, J.S. (School of Advanced Materials and Systems Engineering, Kumoh National University of Technology)
  • 노재승 (금오공과대학교 신소재시스템공학부)
  • Published : 2003.12.01
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Abstract

Anisotropic mesophase carbon fiber(AMCFs) was exposed to isothermal oxidation in air and $CO_2$atmosphere, and burn-off rates have measured by TGA. The microstructure changes of oxidized carbon fibers, were observed by SEM. It was observed that oxidation rate in the air is over 100 times faster than that in $CO_2$atmosphere. The activation energy obtained in air was about 43.4 Kcal/mole in the temperature range of $600∼800^{\circ}C$, and in $CO_2$was about 55.2 Kcal/mole in the temperature range of $950∼1200^{\circ}C$. Therefore, the oxidation reaction in both atmospheres was under chemical reaction regime in the above temperature ranges. It was shown that the oxidation of the AMCFs is initiated at the end of fibers at high temperature($1100^{\circ}C$) with developing the large pores, and the small pores are developed on the fiber surface at low temperature($900^{\circ}C$). In conclusion, the oxidation of the AMCFs is progressed through the imperfection.

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