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침전법을 활용한 Co-Ni 전극의 제조와 용융탄산염 연료전지의 그 적용
김시열(Kim, S.Y.),류보현(Ryu, B.H.),함형철(Hahm, H.C.),한종희(Han, J.),윤성필(Yoon, S.P.),남석우(Nam, S.W.),임태훈(Lim, T.H.),이호인(Lee, H.I.) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.1
In-situ lithiated NiO has been manufactured as a conventional cathode material of molten carbonate fuel cell (MCFC), however this material has a weakness for commercialization of MCFC because NiO is spontaneously dissolved into the electrolyte under MCFC operating conditions, resulting in short circuit between cathode and anode. In this research, therefore, Co(OH)₂-coated Ni powder was prepared by precipitation method with controlling pH at low temperature and atmospheric pressure. Modified cathode was fabricated by a conventional tape casting method and sintered at 700?C in a H₂/N₂ atmosphere, Based on characterization result, Pore size distribution and porosity was suitable for the cathode of MCFC. According to the result of dissolution, Ni solubility of modified cathode was 33% lower than that of conventional cathode. In addition, modified electrode showed a good performance from the single cell operation.
공유식(Y. S. Kong),윤성필(S. P. Yoon),김선진(S. J. Kim) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In this study, the dissimilar friction weldings: were produced using 20mm diameter solid bar in forgineg steel (KS SF45) to carbon steel (KS SM45C) in order to investigate their mechanical properties and the relationship between the weld parameters and the nondestructive coefficients. The optimal friction welding parameters were selected to ensure good quality welds on the basis of visual examination, tensile test, micro-Virkers hardness surveys of the bond of area and microstructure investigations. The specimens were tested for as-welded (AW). And also, the relationships between the weld parameters and nondestructive coefficients, such as AE counts and ultrasonic attenuation coefficient were investigated.