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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.
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.
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.
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.
티타늄 메쉬상에 전석회화된 TiO₂ 나노튜브층의 구조 및 생체활성
송재주(Jae-Joo Song),박형호(Hyeoung-Ho Park) 대한치과재료학회 2011 대한치과재료학회지 Vol.38 No.2
Various surface modification techniques are being used to improve the interfacial properties between human cells and the Ti-based implant surface. Titanium mesh is used in supporting the membrane, providing the necessary space for bone regeneration. This study was performed to investigate the bioactivity of anodized and precalcified titanium mesh. Mesh plate of Ti was anodized at 20 V for 60 minutes in a glycerol solution containing 1wt% NH₄F and 20 wt% deionized water. Heat treatment was achieved in a furnace heated to 500℃ for 2 hours. Precalcification treatment was carried out by soaking in NaH₂PO₄ solution at 80℃ for 30 minutes and saturated Ca(OH)₂ solution at 100℃ for 30 minutes. Results of MMT assay, nanotubular TiO₂ layer showed the highly ordered dense structure and cell viavility by interposing small diameter nanotubes between large ones, the shape of nanotubes was enlarged as going down. Therefore, the cell viability of anodized titanium mesh plate was more improved by precalcification treatment in 0.5 M Na₂HPO₄ and saturated Ca(OH)₂ solution. therefor, The bioactivity of titanium mesh plate was enhanced by anodic oxidation and precalcification treatment.
Capacitor용 Ta분말 제조공정 Waste Ta를 이용한 TaC분말 제조
박제신,서창열,윤재식,배인성,박형호,Park Je-Shin,Suh Chang-Youl,Yaon Jae-Sik,Bae In-Sung,Park Hyeoung-Ho 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.4
케퍼시터용 Ta 분말제조공정에서 발생하는 waste 분말을 이용하여 TaC 분말을 자전고온합성법에 의하여 합성하였다. waste TA는 합성반응의 활성 및 산화방지를 위하여 전처리공정에서 미분쇄 및 탈산처리가 필요하였다. 합성반응에서는 TaC 단일상은 6∼7wt.%C의 조성범위에서 얻을 수 있었다. 또한 반응온도는 시료의 압축력에 영향을 받으며, 압축력 1600psi에서 최고반응온도를 나타냈다. Using the wastes of Ta powder fabrication process for capacitor, TaC powder was synthesized by SHS method. In previous to synthesis, the waste Ta was needed of milling and deoxidization treatments for active reaction and prevention of oxidation. In SHS reaction, it was found that the TaC single phase was obtained in composition of 5~6wt.%C. The reaction temperature was affected by the compaction pressure of the specimens, exhibiting the maximum values at 1600psi, respectively.
배인성(In Seong Bae),박형호(Hyeoung Ho Park),김병일(Byung Il Kim) 한국열처리공학회 2002 熱處理工學會誌 Vol.15 No.1
N/A In conventional metallothermic reduction(MR) for obtaining tantalum powder in batch-type operation, it is difficult to control morphology and location of deposits because the reaction occurs by direct physical contact between reductants and feed materials. On the other hand, a electronically mediated reaction(EMR) is capable to overcome these difficulties through the reaction by electron transfer and have a merit of continuous process. In this study an MR and EMR method has been applied to the production of a tantalum powder by sodium reduction of K_2TaF_7. As the reduction temperature increases, the particle size and yield of tantalum powder obtained by MR and EMR method is increased.