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Thermal Emissivity of a Nuclear Graphite as a Function of Its Oxidation Degree (2) - Effect of Surface Structural Changes -

  • Seo, Seung-Kuk (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology) ;
  • Roh, Jae-Seung (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology) ;
  • Kim, Eung-Seon (Korea Atomic Energy Research Institute (KAERI)) ;
  • Chi, Se-Hwan (Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Suk-Hwan (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology) ;
  • Lee, Sang-Woo (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology)
  • Received : 2009.07.13
  • Accepted : 2009.09.23
  • Published : 2009.12.30
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Abstract

Thermal emissivity of nuclear graphite was measured with its oxidation degree. Commercial nuclear graphites (IG-110, PECA, IG-430, and NBG-18) have been used as samples. Concave on graphites surface increased as its oxidation degree increased, and R value (Id/Ig) of the graphites decreased as the oxidation degree increased. The thermal emissivity increased depending on the decrease of the R (Id/Ig) value through Raman spectroscopy analysis. It was determined that the thermal emissivity was influenced by the crystallinity of the nuclear graphite.

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References

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