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광화학증착법에 의한 직접패턴 PZT 박막의 제조 및 특성
박형호,박형호,김태송,Park, Hyeong-Ho,Park, Hyung-Ho,Kim, Tae-Song,Hill, Ross-H. 한국재료학회 2008 한국재료학회지 Vol.18 No.2
The ferroelectric properties of UV irradiated and non-irradiated PZT films prepared via photochemical metal-organic deposition using photosensitive precursors were characterized. Fourier transform infrared spectroscopy showed that complete removal of organic groups was possible through UV exposure of the spin-coated PZT precursor films at room temperature. The measured remnant polarization values of UV-irradiated and non-irradiated PZT films after annealing at $650^{\circ}C$ were 29 and $23\;{\mu}C/cm^2$, respectively. The UV irradiation was found to be effective for the enhancement of the <111> growth orientation and ferroelectric property of PZT film and in the direct patterning in the fabrication of micro-patterned systems without dry etching.
저온 저압성형 융융탄산염 연료전지용 전해질판의 제조 및 특성
박형호,권오성,이규택 ( Hyeoung Ho Park,Oh Sung Kwon,Kyu Taek Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.6
용융탄산염 연료전지에 유용한 저온 저압성형 전해질 matrix를 제조하기 위해 결합제로서 polyethylene을 사용하여 성형온도, 압력, 전해질 조성 및 결합제의 양의 변화가 전해질 matrix 특성에 미치는 영향을 조사하였다. 전해질 matrix의 상온 제조시 최적 성형압력은 150㎏/㎠였으며, 160℃에서는 150㎏/㎠이상의 성형 압력하에서 발생되는 전해질 matrix내 polyethylene의 응집현상과 열응력으로 인해 최적 성형압력은 100㎏/㎠였다. 160℃에서 제조된 전해질 matrix의 강도는 결합제로 첨가된 polyethylene의 영향을 받아 상온 제조시보다 높았다. 또한 상온에서 전해질 matrix의 특성에 가장 큰 영향을 미치는 인자는 전해질 함량이었으며, 160℃에서는 polyethylene의 함량이었다. The electrolyte matrix for MCFC was fabricated by using a polyethylene as a binder under low-temperature and low-pressure. The effects of compaction temperature, pressure, composition of electrolyte matrix and amount of binder on characteristics of electrolyte matrix were investigated in this study. The optimum compaction pressure was 150㎏/㎠ at 25℃, 100㎏/㎠ at 160℃ because of the cluster of polyethylene and thermal stress beyond 150㎏/㎠, respectively. The strength of electrolyte matrix fabricated at 160℃ was higher than that of electrolyte matrix fabricated at 25℃ due to the effect of polyethylene. The most important factor effecting on the characteristics of electrolyte matrix was the amount of electrolyte at 25℃, amount of polyethylene at 160℃ respectively.
MR-EMR 복합제조공정에서 환원제 위치가 탄탈륨 분말 특성에 미치는 영향
박형호,윤재식,배인성,김양수,윤동주,원대희,김병일,Park, Hyeoung-Ho,Yoon, Jae-Sik,Bae, In-Sung,Kim, Yang-Soo,Yoon, Dong-Ju,Won, Dae-Hee,Kim, Byung-Il 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3
A process known as the MR and EMR combination process is able to overcome the shortcomings of the MR (metallothermic reduction) and EMR (electronically mediated reaction) process. The effects of $K_2TaF_7$ as the raw material, sodium as the reducing agent and KCl/KF as the diluent on the characteristics of tantalum powder are investigated. In this study, a MR-EMR combination process has been employed to tantalum powder on the location of reductant. The excess of reductant were varied from 25, 50 to 75 wt%. The total charge and external circuit decreases as the amount of reductant increases. The average particle size increases with increasing the amount of reductant.
박형호,윤재식,배인성,김양수,윤동주,원대희,김병일,Park, Hyeoung-Ho,Yoon, Jae-Sik,Bae, In-Sung,Kim, Yang-Soo,Yoon, Dong-Ju,Won, Dae-Hee,Kim, Byung-Il 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3
In the metallothermic reduction (MR) process used to obtain tantalum powder in one batch, it is difficult to control the morphology and location of the tantalum deposits. On the other hand, an electronically mediated reaction (EMR) process is capable of overcoming this difficulty. The effect of using $K_2TaF_7$ as the raw material and sodium as the reducting agent on the characteristics of tantalum powder are investigated. As the temperature of the reduction varied from 1023K to 1223K, the powder particles obtained with MR were relatively large $({\sim}34{\mu}m)$, while those prepared via EMR were of uniform $(13{\mu}m)$. In the MR process, the Ta powder recovery rate increased from 37% to 83% at 1123K in constrat with EMR process.