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Vol.49, No.7, 557 ~ 565, 2011
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| Title |
| Effects of Surface Roughness on the Thermal Emissivity of IG-11 Graphite for Nuclear Reactor |
| 노재승 Jae Seung Roh , 서승국 Seung Kuk Seo , 김석환 Suk Hwan Kim , 지세환 Se Hwan Chi , 김응선 Eung Seon Kim , 김혜성 Hye Sung Kim |
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| Abstract |
| This paper reports the relationship between the surface roughness and thermal emissivity of graphite (IG-11) in nuclear reactors. The roughness was controlled by changing the oxidization time, resulting in 0, 6, and 11% losses of mass. The levels of roughness were 0.40, 0.72 and 1.09㎛ for the weight loss of 0, 6 and 11%, respectively. The binders and graphite fillers were found to have sequentially oxidized with a higher thermal emission for the highly oxidized sample, but with a lower emission when measured at a higher temperature. Our study suggests a method for predicting the thermal emission rate of graphite in a nuclear reactor based on roughness measurement. |
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| Key Words |
| carbon and graphite, scanning electron microscopy, SEM, thermal emissivity, surface roughness, isotropic nuclear graphite |
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