Effects of chemical composition of carbonaceous powder on morphology and thermal properties of graphite blocks
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 32권 / 3호
ㆍ저자명 : Jen‑Yung Hsu, Chun‑Jen Su, Yung‑Lin Yen, Che‑Yun Lee
ㆍ저자명 : Jen‑Yung Hsu, Chun‑Jen Su, Yung‑Lin Yen, Che‑Yun Lee
목차
Abstract1 Introduction
2 Materials and methods
2.1 Materials and fabrication of graphite blocks
2.2 Characterization of graphite blocks
3 Results and discussion
3.1 Characterization of MCMBs
3.2 Pore morphology of graphite blocks
3.3 Thermal conductivity coefficients of graphite blocks
4 Conclusions
Acknowledgements
References
영어 초록
Two kinds of mesocarbon microbeads (MCMBs) with different chemical composition have been synthesized. The MCMBs were molded and heat treated at temperatures above 2000 °C to obtain graphite blocks. The effects of chemical composition of MCMBs on the pore morphology, carbon texture and thermal properties of the derived graphite blocks have been explored. The pore morphology was investigated by small angle X-ray scattering technique and a graphitization-induced morphology transition was observed. When the graphitic crystallite size exceeded a threshold value, the association of crystallites and migration of randomly distributed pores took place extensively. For the graphite blocks made of MCMBs which had light components with higher aromaticity value, the growth of crystallites caused a significant enhancement in thermal conductivity for the specimens. However, for the other kind of MCMBs, their light components tended to form solid porous carbon texture after graphitization, and the thermal conductivity coefficients of their graphite blocks could only increase slightly as crystallites grew. It was suggested that the thermal resistance at the granule’s boundary became noticeable in the latter case and thus the growth of thermal conductivity coefficients was prominently hindered.참고 자료
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