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복사에너지를 이용한 TIM소재의 방열 특성 향상을 위한 연구
황명원,김도형,정우창,정원섭,Hwang, Myungwon,Kim, Dohyung,Jung, Uoo-Chang,Chung, Wonsub 한국표면공학회 2019 한국표면공학회지 Vol.52 No.2
The aim of this study is to quantitatively demonstrate the possibility of heat transfer by thermal radiation by comparing heat transfer by conventional heat transfer and radiation by radiation. 1) The heat transfer was measured by using filler of TIM material with low thermal conductivity (CuS). As a result, heat transfer was easier than ceramic with high thermal conductivity ($Al_2O_3$ and $Si_3N_4$). 2) The reason for this is thought to be that the infrared wave due to radiation of the air diaphragm has moved easily. 3) From the above results, the heat dissipation of the TIM material indicates the possibility of heat transfer by thermal radiation.
수명을 향상시키기 위해 Al 메탈 코팅과 양극산화처리된 Steel 도가니의 파괴 거동
차태민(Taemin Cha),신병현(Byung-Hyun Shin),황명원(Myungwon Hwang),김도형(Do-Hyung Kim),정원섭(Won-Sub Chung) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.1
Steel crucible used for molten Al has a problem of very limited lifetime because of the interaction between Fe and molten Al. This study was performed to improve the lifetime of steel crucible for molten Al by coating metallic Al and by further anodizing treatment to form thick and uniform anodic oxide films. The lifetime of the steel crucible was improved slightly by Al coating from 30 to 40 hours by metallic Al coating and largely to 120 hours by coating the surface with anodic oxide film. The improved lifetime was attributed to blocking of the reaction between Fe and molten Al with the help of anodic oxide layer with more than 20 um thickness on the crucible surface. The failure of the steel crucible arises from the formation of intermetallic compounds and pores at the steel/Al interface.