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Thermal Emissivity of Nuclear Graphite as a Function of Its Oxidation Degree (1) -Effects of Density, Porosity, and Microstructure-

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2009, 10(3), pp.225-229
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

서승국 1 Eung-Seon Kim 2 Se-Hwan Chi 3 Suk Hwan Kim 4 Sang-Woo Lee 4 Roh, Jae-Seung 1

1금오공과대학교
2Korea Atomic Energy Research Institute (KAERI)
3Korea Atomic Energy Research Institute (KAERI),
4Kumoh National Institute of Technology

Candidate

ABSTRACT

Thermal emissivity of commercial nuclear graphites (IG-110, PCEA, IG-430 and NBG-18) following changes in oxidation degrees were examined. Specimens were oxidized to 0%, 5%, and 10% in air flow of 5l/min at 600oC using a furnace, and the thermal emissivities were measured using an infrared spectrum analyzer. The measuring temperatures for the thermal emissivity were 100oC, 200oC, 300oC, 400oC and 500oC. Also density and porosity of the specimens were observed to compare with thermal emissivity. Results showed that emissivity increased with oxidation, and the 10% oxidized NBG-18 showed the highest emissivity (0.890) which value is larger for 24% than the value of as-received specimen. Investigation of factors affecting the emissivity revealed that increases in the surface roughness and porosity due to oxidation were responsible for the increase in emissivity after oxidation.

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