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

노재승; J.S. Roh

Korean Journal of Materials Research, Vol.13, No.12, 831-838, December, 2003

DOI10.3740/MRSK.2003.13.12.831 Export Citation

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

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

노재승 ^†

금오공과대학교 신소재시스템공학부

J.S. Roh^†

School of Advanced Materials and Systems Engineering, Kumoh National University of Technology, Kumi 730-701, Korea

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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 ? C , and in CO 2 was about 55.2 Kcal/mole in the temperature range of 950∼1200 ? 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 ? C ) with developing the large pores, and the small pores are developed on the fiber surface at low temperature( 900 ? C ). In conclusion, the oxidation of the AMCFs is progressed through the imperfection.

Keywords:oxidation;SEM;anisotropic;mesophase;carbon fiber

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Lu GQ, Do DD, Carbon, 30, 21 (1992)
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Ismail MK, Hurley WC, Carbon, 30, 419 (1992)
Lafdi K, Bonnamy S, Oberlin A, Carbon, 30, 533 (1992)
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Lu S, Blanco C, Rand B, Carbon, 40, 2109 (2002)
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Roh JS, Korea J. Materials Research, in press (2003) (2003)
Li T, Zheng X, Carbon, 33, 469 (1995)
Tanabe Y, Utasunomiya M, Ishibashi M, Kyotani T, Kaburagi Y, Yasuda E, Carbon, 40, 1 (2002)
Matsumura Y, Xu X, Antal MJ Jr., Carbon, 35, 819 (1997)
Tomlinson JB, Freeman JJ, Sing KSW, Theocharis CR, Carbon, 33, 789 (1995)

[Related Articles]

[1] Lu GQ, Do DD, Carbon, 30, 21 (1992)

[2] Kinoshita K, Carbon, 174 (1988)

[3] Ismail MK, Hurley WC, Carbon, 30, 419 (1992)

[4] Lafdi K, Bonnamy S, Oberlin A, Carbon, 30, 533 (1992)

[5] Walker PL, Jr, Rusinko F, Jr, Austine LG, Advanced in Catalysis, 11, 133, Ed. by Eley EE, Selwood PE, Weisz PB, Academic press, New York (1959) (1959)

[6] Dami TL, Manocha LM, Bahl OP, Carbon, 29, 51 (1991)

[7] Ismail MK, Carbon, 29, 777 (1991)

[8] Lu S, Blanco C, Rand B, Carbon, 40, 2109 (2002)

[9] Hong SH, Korai Y, Mochida I, Carbon, 34, 86 (1996)

[10] Hong SH, Korai Y, Mochida I, Carbon, 38, 805 (2000)

[11] Roh JS, Suhr DS, Korean J. Materials Research, 7, 121 (1997)

[12] Donnet JB, Bansal RC, Carbon Fibers, 2nd ed., 84, Marcel Decker, inc. (1990) (1990)

[13] Endo M, J. Mater. Sci., 23, 598 (1988)

[14] Roh JS, Korea J. Materials Research, in press (2003) (2003)

[15] Li T, Zheng X, Carbon, 33, 469 (1995)

[16] Tanabe Y, Utasunomiya M, Ishibashi M, Kyotani T, Kaburagi Y, Yasuda E, Carbon, 40, 1 (2002)

[17] Matsumura Y, Xu X, Antal MJ Jr., Carbon, 35, 819 (1997)

[18] Tomlinson JB, Freeman JJ, Sing KSW, Theocharis CR, Carbon, 33, 789 (1995)