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PET 기판 위에 SiO₂ 버퍼층 증착에 따른 ITO 박막의 부착 및 전기적 광학적 특성 연구
강자연(Ja-youn Kang),김동원(Dong-won Kim),조규일(Dong-won Kim),우병일(Byung-il Woo),윤환준(Hwan-jun Yun) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.1
Using an evaporation system, SiO₂ was deposited as a buffer layer between a PET substrate and a ITO layer and then ITO/SiO₂/PET layers were annealed for 1.5 hours at the temperature of 180℃. Adhesion and electro-optical properties of ITO films were studied with thickness variance of a SiO₂ buffer layer. As a result of introduction of the SiO₂ buffer layer, sheet resistance and resistivity increased and a ITO film with optimum sheet resistance ( 529.3 Ω/square) for an upper ITO film of resistive type touch panel could be obtained when SiO₂ of 50 A was deposited. And it was found that ITO films with SiO₂ buffer layer have higher transmittance of 88~90% at 550 ㎚ wavelength than ITO films with no buffer layers and the transmittance was enhanced as SiO₂ thickness increased from 50 A to 100 A. Adhesion property of ITO films with SiO₂ buffer layers became better than ITO films with no buffer layers and this property was independent of SiO₂ thickness variance (50~100 A). By depositing a SiO₂ buffer layer of 50 A on the PET substrate and sputtering a ITO thin film on the layer, a ITO film with enhanced adhesion, electro-optical properties could be obtained.
김동원(Dong-Won Kim),조규일(Kyu-Il Cho),김현근(Hyun-Keun Kim),강자연(Ja-Youn Kang),이원혁(Won-Hyuk Rhee),황금철(Keum-Cheol Hwang) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.5
The porous metal material is used for injection metal mold with a great deal of gas production because it makes plenty of gas exhausted through pores formed in the metal mold. A canning HIP method was conventionally used for manufacturing of porous metals, but because of difficulty of process control and high cost of production its application was limited. In this experiment, porous metal mold material was produced by an enhanced vacuum sintering method with simply controlled and economical process and porosities/mechanical properties with variation of sintering temperature and duration time during vacuum sintering were studied. As a result, quality goods were obtained at optimized conditions as follows: sintering temperature of 1230℃, duration time of 2 hr and showed superior properties in wear loss and thermal conductivity and the same properties in hardness, TRS (Transverse Rupture Strength), and thermal expansion coefficient in comparison with those under canning HIP.