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동향자료
저자정보
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)
저널정보
한국탄소학회 Carbon letters Carbon letters 제10권 제3호
발행연도
2009.1
수록면
225 - 229 (5page)

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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 $600^{\circ}C$ using a furnace, and the thermal emissivities were measured using an infrared spectrum analyzer. The measuring temperatures for the thermal emissivity were $100^{\circ}C$, $200^{\circ}C$, $300^{\circ}C$, $400^{\circ}C$ $500^{\circ}C$. 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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