Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Correlation Between the Porosity and the Thermal Emissivity as a Function of Oxidation Degrees on Nuclear Graphite IG-11

원자로급 흑연 IG-11의 산화율에 따른 기공도와 열방사율과의 관계

  • Seo, Seung-Kuk (School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technolog) ;
  • Roh, Jae-Seung (School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technolog) ;
  • Kim, Gyeong-Hwa (School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technolog) ;
  • Chi, Se-Hwan (Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Eung-Seon (Korea Atomic Energy Research Institute (KAERI))
  • 서승국 (금오공과대학교 신소재시스템공학부) ;
  • 노재승 (금오공과대학교 신소재시스템공학부) ;
  • 김경화 (금오공과대학교 신소재시스템공학부) ;
  • 지세환 (한국원자력연구소) ;
  • 김응선 (한국원자력연구소)
  • Published : 2008.12.27
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Abstract

Graphite for the nuclear reactor is used to the moderator, reflector and supporter in which fuel rod inside of nuclear reactor. Recently, there are many researches has been performed on the various characteristics of nuclear graphite, however most of them are restricted to the structural and the mechanical properties. Therefore we focused on the thermal property of nuclear graphite. This study investigated the thermal emissivity following the oxidation degree of nuclear graphite with IG-11 used as a sample. IG-11 was oxidized to 6% and 11% in air at 5 l/min at $600^{\circ}C$. The porosity and thermal emissivity of the sample were measured using a mercury porosimeter and by an IR method, respectively. The thermal emissivity of an oxidized sample was measured at $100^{\circ}C$, $200^{\circ}C$, $300^{\circ}C$, $400^{\circ}C$ and $500^{\circ}C$. The porosity of the oxidized samples was found to increase as the oxidation degree increased. The thermal emissivity increased as the oxidation degree increased, and the thermal emissivity decreased as the measured temperature increased. It was confirmed that the thermal emissivity of oxidized IG-11 is correlated with the porosity of the sample.

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References

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