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열전도성 고분자 복합소재/금속 소재 하이브리드 구조의 방열기구 설계 및 방열특성에 관한 연구
유영은,김덕종,윤재성,박시환,Yoo, Yeong-Eun,Kim, Duck Jong,Yoon, Jae Sung,Park, Si-Hwan 한국금형공학회 2016 한국금형공학회지 Vol.10 No.3
Thermally or electrically conductive filler reinforced polymer composites are extensively being developed as the demand for light weight material increases rapidly in industiral applications need good conductivity such as heat sink of the electronics or light. Carbon or ceramic materials like graphite, carbon nanotube or boron nitride are typical conductive fillers with good thermal or electical conductivity. Using these conductive fillers, the polymer composites in the market show wide range of thermal conductivity from approximately 1 W/mK to 20 W/mK, which is quite enhanced considering the thermal conductivity lower than 0.5 W/mK for most polymeric materials. The practical use of these composites, however, is yet limited to specific applications because most composites are still not conductive enough or too difficult to process, too brittle, too expensive for higher conductivity. For practical use of conductive composite, the thermal conductivity required depending on the heat releasing mode are studied first for simplified unit cooling geometry to propose thermal conductivities of the composites for reasonable cooling performance comparing with the metal heat sink as a reference. Also, as a practical design for heat sink based on polymer composite, composite and metal sheet hybrid structures are investigated for LED lamp heat sink and audio amplication module housing to find that this hybrid structure can be a good solution considering all of the cooling performance, manufacturing, mechanical performance, cost and weight.
유영은(Yeong-Eun Yoo),서영호(Young Ho Seo),최두선(Doo-Sun Choi),이준형(Jun Hyung Lee),제태진(Tae Jin Che),황경현(Kyung Hyun Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A new method is proposed to fabricate a reusable qualtz master with order of 100 nm dot pattern on its surface. Some fabrication conditions such as dose are investigated to find optimal condition. This reusable qualtz master is used directly as a stamper to injection mold the dot patterns. Polycarbonate and Polyoxymethylene are used as molding materials and the effect of the mold temperature is also investigated to see the moldabilty of the injection molding for very fine dot features.
유영은(Yeong-Eun Yoo),김태훈(Tae-Hoon Kim),서영호(Young-Ho Seo),최두선(Doo-Sun Choi),이학주(Hak Joo Lee),김완두(Wan-Doo Kim),황경현(Kyunghyun WHang),조길원(Kil-Won Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Some nano hair systems in the nature are found to show excellent adhesive characteristic, which is called dry adhesive. To develop a practical synthetic dry adhesive system, we mold nano hairs on plastic substrates using thermoplstic materials including COC, PP, PC and PMMA. and estimate the moldability and the adhesive characteristic. As a template for molding nano hairs, AAO membrane is first adopted, which is 60㎛ thick and 13㎜ in diameter. This membrane has about billions of through-holes of which diameter is around 200㎚. This AAO membrane and the pellet of materials are stacked in the mold and pressed to mold after heating up to be melted. The AAO membrane is removed using KOH to obtain the molded nano hairs. The molded nano hair substrates is estimated to show much better adhesive characteristic than a substrate without nano hairs.