벌크흑연 제조를 위한 결합재로 이용되는 콜타르 핏치 및 페놀수지의 열처리에 의한 결정성 변화 = Crystallinity Changes Heat Treatment of Coal Tar Pitch and Phenol Resin used as a Binder for Bulk Graphite Manufacturing

국문 초록 (Abstract)

인조흑연 제조용 바인더로 주로 이용되는 콜타르 핏치와 페놀 레진은 soft carbon 및 hard carbon의 초기 탄소화합물구조에 차이가 있다. 따라서 탄화 온도에 따른 열분해 거동, 미세조직, 결정성의 변화 과정도 다를 것으로 예상할 수 있다. 본 연구에서는 콜타르 핏치 및 페놀 레진의 열분해 거동, 미세조직, 결정성 변화에 관하여 비교 분석하였다. 콜타르 핏치는 액상을 경유한 탄화 과정을 거치며, 탄화 온도가 증가함에 따라 미세조직이 점차 변화되는 것을 확인할 수 있었다. 탄화 온도가 증가함에 따라 콜타르 핏치 및 페놀 레진 모두 결정성은 증가하는 경향을 나타냈지만, 콜타르 핏치는 미세조직이 급변하는 500 및 600 ℃ 구간에서 결정성도 급격히 변화는 것을 확인할 수 있었다. 또한 미세조직과 결정성은 서로 밀접한 연관성이 있었다.

다국어 초록 (Multilingual Abstract)

The coal tar pitch and phenol resins are used as binders in artificial graphite manufacture, but there are differences in the initial carbon compound structure. According to the carbonization temperature, it can be expected that there are differences in thermal decomposition behavior, microstructure, and crystallinity change. These properties of the coal tar pitch and phenol resins were compared to each other. As the carbonization temperature of coal tar pitch and phenol resin increases, crystallinity tends to increase. The coal tar pitch went through the carbonization process through the liquid, and it was confirmed that the crystallinity changed rapidly in the temperature range of 500 and 600 ℃, where the microstructure changed quickly. These results confirmed the close correlation between microstructure and crystallinity.

참고문헌 (Reference)

1 양재연, "석탄계 및 석유계 피치가 함침된 탄소/탄소 복합재료 제조 및 특성" 한국공업화학회 26 (26): 406-412, 2015

2 김성수, "리튬이차전지용 음극 소재 기술 개발 동향" 한국전기화학회 11 (11): 211-222, 2008

3 이상혜, "X-ray diffraction analysis of the effect of ball milling time on crystallinity of milled polyacrylonitrile-based carbon fiber" 한국탄소학회 26 (26): 11-17, 2018

4 강동수, "X-ray diffraction analysis of the crystallinity of phenolic resin-derived carbon as a function of the heating rate during the carbonization process" 한국탄소학회 27 (27): 108-111, 2018

5 J. H. Chae, "The carbonization behaviors of coal tar pitch for mechanical seal" 2 : 182-191, 2001

6 X. Bourrat, "Structure of mesophase pitch fibers" 28 : 435-446, 1990

7 Y. D. Park, "Production technology of artificial graphite electrodes for are furnace" 8 : 155-162, 1997

8 A. Dang, "Preparation and pyrolysis behavior of modified coal tar pitch as C/C composites matrix precursor" 119 : 18-23, 2016

9 I. Mochida, "Oxygen distribution in the mesophase pitch fibre after oxidative stabilization" 24 : 389-394, 1989

10 S. Ōtani, "On the carbon fiber from the molten pyrolysis products" 3 : 31-34, 1965

11 K. Azami, "Kinetics of mesophase formation of petroleum pitch" 32 : 947-951, 1994

12 K. J. Hüttinger, "Kinetics of mesophase formation in a stirred tank reactor and properties of the products - II. Discontinuous reactor" 30 : 1-8, 1992

13 W. O. Souza, "Electrical behavior of carbon fiber/phenolic composite during pyrolysis" 18 : 1209-1216, 2015

14 J. M. Ripalda, "Correlation of x-ray absorption and x-ray photoemission spectroscopies in amorphous carbon nitride" 60 : R3705-R3708, 1999

15 A. Oberlin, "Carbonization and graphitization" 22 : 521-541, 1984

16 Y. Yamashita, "A study on carbonization of phenol-formaldehyde resin labelled with deuterium and 13C" 19 : 89-94, 1981

17 J. S. Roh, "A structural study of the oxidized high modulus pitch based carbon fibers by oxidation in carbon dioxide" 5 : 27-33, 2004