Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Pore Structure and Characteristics of Hollow Spherical Carbon Foam According to Carbonization Temperature and Re-immersion Treatment

탄화온도 및 재담금 처리에 따른 중공형 탄소다공체의 기공구조 및 특성

  • Yi, Eunju (Advanced Characterization & Analysis Department, Korea Institute of Materials Science(KIMS)) ;
  • Lee, Changwoo (Advanced Characterization & Analysis Department, Korea Institute of Materials Science(KIMS)) ;
  • Kim, Yangdo (Department of Materials Science and Engineering, Pusan National University) ;
  • Rhyim, Youngmok (Advanced Characterization & Analysis Department, Korea Institute of Materials Science(KIMS))
  • 이은주 (한국기계연구원 부설 재료연구소 재료물성연구실) ;
  • 이창우 (한국기계연구원 부설 재료연구소 재료물성연구실) ;
  • 김양도 (부산대학교 재료공학과) ;
  • 임영목 (한국기계연구원 부설 재료연구소 재료물성연구실)
  • Received : 2012.10.16
  • Accepted : 2012.11.20
  • Published : 2013.01.27
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Abstract

Today, the modification of carbon foam for high performance remains a major issue in the environment and energy industries. One promising way to solve this problem is the optimization of the pore structure for desired properties as well as for efficient performance. In this study, using a sol-gel process followed by carbonization in an inert atmosphere, hollow spherical carbon foam was prepared using resorcinol and formaldehyde precursors catalyzed by 4-aminobenzoic acid; the effect of carbonization temperature and re-immersion treatment on the pore structure and characteristics of the hollow spherical carbon foam was investigated. As the carbonization temperature increased, the porosity and average pore diameter were found to decrease but the compression strength and electrical conductivity dramatically increased in the temperature range of this study ($700^{\circ}C$ to $850^{\circ}C$). The significant differences of X-ray diffraction patterns obtained from the carbon foams carbonized under different temperatures implied that the degree of crystallinity greatly affects the characteristics of the carbon form. Also, the number of re-impregnations of carbon form in the resorcinol-formaldehyde resin was varied from 1 to 10 times, followed by re-carbonization at $800^{\circ}C$ for 2 hours under argon gas flow. As the number of re-immersion treatments increased, the porosity decreased while the compression strength improved by about four times when re-impregnation was repeated 10 times. These results imply the possibility of customizing the characteristics of carbon foam by controlling the carbonization and re-immersion conditions.

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References

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