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RISS 인기검색어
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- 저자 : 이규택 ( Hyeoung Ho Park (검색결과 6 건)
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용융염 전해질에서 용융탄산염 연료전지 분리재의 고온 특성
박형호,이규택,후등정치 (後藤政治) ( Hyeoung Ho Park,Kyu Taek Lee,Shoji Goto ) 한국공업화학회 1995 공업화학 Vol.6 No.2
본 연구에서는 분리재로 오스테나이트계 스테인레스강 중 310S, 316강을 사용하여 전해질 분위기하에서 분리재의 내식성, 부식거동, 부식산물 형성과정 및 합금원소들의 영향 등을 SEM-EPMA와 X-RD분석을 통해 조사하였다. 내식성은 316강에 비해 310S강이 우수하였으며, 부식 진행과정은 부식산물 형성단계와 부식 억제단계 및 부식 진행단계의 3단계 과정을 경유하였다. 원소들의 거동은 부식산물 형성영역에서는 Fe가, 부식 방어영역에서는 Cr이, 그리고 Ni은 Cr고갈영역과 기지 안쪽에서 부하게 형성되었으며, Mo은 Cr과 같은 거동을 보였다. 부식산물의 형성과정은 부식초기 단계에서는 LiFe_5O_8과 LiFeO₂였으나 최종 안정 부식산물은 LiFeO₂였다. 310S, 316 among the austenitic stainless steel were used as separator material in this study. Corrosion resistance, corrosion behavior, the formation of corrosion products and the effects of alloying elements were examined by the SEM-EPMA and XRD on the separator material at the electrolyte condition. Corrosion resistance of the 310S was higher than that of the 316. Corrosion proceeded via three steps; a formation step of corrosion products, a protection step against corrosion and a advance step of corrosion. From the standpoint of the behavior of the elements in the specimen, Fe, and Cr, Ni were formed richly in the region of corrosion product, in the region of corrosion protection, and at the Cr-depleted zone respectively. Mo showed the same behavior as Cr. With respect to the formation of corrosion products, LiFe_5O_8 and LiFeO₂were the corrosion products at the corrosion initial stage, but LiFeO₂was the final corrosion product.
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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.
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이규택,박영호 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
The study has been made to determine of impurities effect on copper electrorefining. All deposits were made at the temperature of 50℃ on an aluminium cathode. During the electrorefining of copper, various current densities have been used. The deposits were analyzed by SEM(Scanning Electron Microscope) and determined morphology and crystal orientation by X-ray diffraction. And induction coupled plasma emission spectrophotometer has determined the grade and the impurities of cathoed deposits. The results from this study were summarized follow : 1. Impurities of cathode deposits such as As, Sb were eliminated by chloried ion 2. The higher the chloride ion concentration goes, the higher the current efficiency goes. 3. The higher the current density goes, to the contrary, the lower the grade of cathode copper goes. But at the same current density, the grade of cathode copper increased as the chloried ion concentration goes up. 4. The rough of cathode surface(in the absent of chloride ion at high current density) was improved by addition of chloride ion 5. Crystal orientation of the cathode deposit was effected by chloride ion concentration and current density.
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용융탄산염 연료전지용 Ni, NiO (Li) cathode 의 소결특성 및 용해거동
박형호,이규택 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.4
In-situ Ni and ex-situ NiO(Li) cathodes were fabricated by cold pressing using Ni powder and Li₂CO₃(in case of ex-situ cathode) with paraffin wax as a binder. The characteristics of in-situ and ex-situ cathodes according to the sintering temperature were examined. Also the behavior of the in-situ and ex-situ cathodes under the MCFC operation condition were investigated in this study. The optimum sintering temperature was 800℃ of neck growth step leading to the porosity of about 70% and strength of about 350MPa. To obtain reasonably high electric conductivity in ex-situ cathode, the sintering temperature was chosen to be below 950℃ to maintain the cation fraction of L^+ in the range of 0.02∼0.06. In terms of the Ni-dissolution rate, ex-situ cathode was more efficient than in-situ cathode in the long-term operation except the initial 24hr. Corrosion product was Li₂NiO_(10) at the in-situ and ex-situ cathodes.
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김혁,박형호,이규택 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1
Aluminum and chromium were simultaneously co-deposited on the austenitic stainless steel substrates by pack cementation process. The effects of various combinations(masteralloy-activator-diffusion process) on the characteristics of coating layer on 310S and 316 were investigated. The most important factor controlling the simultaneous Cr-Al coating was composition of the masteralloy. The 80Cr-20Al(wt%) masteralloy exhibited better coating characteristics than the 95Cr-5Al(wt%) masteralloy. The 2-step coating cycle showed more desirable coating layer than the 1-step coating cycle. The coating morphology of each specimen consisted of two distinct layers, an outer layer of a brittle and continuous β-NiAl intermetallic phase and an underlying diffusion zone. In the same coating cycle with the same masteralloy composition, the more uniform coated layer was formed on 316 than on 310S due to the austenite stabilization of the substrate.
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