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민복기(Bokki Min),김재구(Jaegu Kim),조성학(Sunghak Cho),최두선(Doosun Choi),황경현(Kyunghyun Whang) 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
This paper presents the method to fabricate a roll mold with microstructure using DPSS(diode pumped solid-states) UV laser. DPSS laser ablation makes it possible to micromachine by controlled energy density and pulse repetition rate of laser. But, In case of metal ablation, molten debris is caused by thermal damage. Hence, We suggest the process of the ablation of a photoresist(PR) coated on roll mold. And we design a roll coater for laminating the photoresist onto the curby surface of a copper roll mold. The microstructure on roll mold is fabricated by controlled laser pulse energy, pulse repetition rate, rotation speed and rotation number of roll. We compare and analyze the quality of microstructure by the wet etching process with the quality by the direct write process.
Li₂CO₃ 첨가에 의한 BaSr(TiO₃)의 저온 소결과 가변유전 특성
김인성(Insung Kim),민복기(Bokki Min),정순종(Soonjong Jeong),송재성(Jaesung Song),전소현(Sohyun Jeon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
(BaSr)TiO₃ thick films were prepared by tape casting method using BaTiO₃ and SrTiO₃ powder slurry in order to investigate dielectric properties and low temperature sintering. Sintering density was 5.7 g/㎤ and the BST sample exhibited the maximum dielectric constant, tunability at temperatures near phase transition point. The dielectric constant was increased and curie temperature was shifted to higher temperature with increasing of annealing temperature.