| Title |
Effects of Surface Roughness on the Thermal Emissivity of IG-11 Graphite for Nuclear Reactor |
| Authors |
노재승(Jae Seung Roh); 서승국(Seung Kuk Seo); 김석환(Suk Hwan Kim); 지세환(Se Hwan Chi); 김응선(Eung Seon Kim); 김혜성(Hye Sung Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2011.49.7.557 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
carbon and graphite; scanning electron microscopy; SEM; thermal emissivity; surface roughness; isotropic nuclear graphite |
| 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. |