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엄운용,노재승,안재상,강동수,서승국,김석환,Eom, Woon-Yong,Roh, Jae-Seung,Seo, Seung-Kuk,Ahn, Jai-Sang,Kang, Dong-Su,Kim, Suk-Hwan 한국재료학회 2010 한국재료학회지 Vol.20 No.4
Recent high efficiency electronic devices have been found to have heat emission problems. As for LEDs, an excessive increase in the device temperature causes a drop of the luminous efficiency and circuit lifetime. Therefore, heat release in the limited space of such electronic parts is very important. This is a study of the possibility of using a coating of carbon materials as a solution for the thermal emission problem of electronic devices. Powdered carbon materials, cokes, carbon blacks, amorphous graphite, and natural flakes were coated with an organic binder on an aluminum sheet and the subsequent thermal emissivity was measured with an FT-IR spectrometer and was found to be in the range of $5{\sim}20\;{\mu}m$ at $50^{\circ}C$. The emissivity of the carbon materials coated on the aluminum sheet was shown to be over 0.8 and varied according to carbon type. The maximum thermal emissivity on the carbon black coated-aluminum surface was shown to be 0.877. The emissivity of the anodized aluminum sheets that were used as heat releasing materials of the electronic parts was reported to be in the range of 0.7~0.8. Therefore, the use of a coating of carbon material can be a potential solution that facillitates heat dissipation for electronic parts.
노재승(Jae-Seung Roh),안재상(Jai-Sang Ahn),김범준(Beom-Jun Kim),전호연(Ho-Yeon Jeon),서승국(Seung-Kuk Seo),김석환(Suk Hwan Kim),이상우(Sang-Woo Lee) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.2
This study is the research on the thermal emissivity depending on the bulk graphite’s alignment degree. Bulk graphites were manufactured by uni-axial pressing and subsequent heat treatment of natural graphite flakes with organic binder. The samples were prepared to be 0° (relative to the 002 c-face), 45°, and 90° (relative to the 100 a-face) for measuring alignment degree. The alignment degree of the sample was measured by XRD. The thermal emissivity was measured by infrared thermal image camera at 100oC and compared with the value obtained by Infrared spectroscopy. The alignment degree and thermal emissivity of 0° sample were measured to be 0 and 0.70 respectively. And those of 90° sample were 0.73 and 0.80 respectively. The emissivity value was correlated with obtained by IR spectroscopy. Therefore it was considered that the thermal emissivity of the bulk graphite is correlated with the alignment degree.