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이온선 혼합에 의한 Al / Pd계의 상형성 및 전이에 관한 열역학적 연구
최정동(Jeong Dong Choi),홍진석(Jin Seok Hong),곽준섭(Joon Seop Kwak),지응준(Eung Joon Chi),박상욱(Sang Wook Park),백홍구(Hong Koo Baik),채근화(Keun Hwa Chae),정성문(Sung Mun Jung),황정남(Chung Nam Whang) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.2
Al/Pd 계에서 이온선 혼합에 의한 초기 상형성 및 상전이를 연구하기 위하여 Al(500 Å)/Pd (200 Å)/glass 이중박막을 제작하여 여러가지 이온선량으로 80 keV의 에너지를 가진 Ar^+을 주입시켰다. RBS, TEM 등을 이용하여 이온선에 의한 혼합양상 및 상분석을 행하였다. 상온에서 이온선 혼합법에 의해 초기에 형성된 Al₃Pd₂는 이온선량이 증가함에 따라 Al₃Pd₂ 뿐만 아니라 AlPd상이 형성됨을 알 수 있었다. 유효생성열 (ΔH') 개념을 이온선 혼합에 의한 상형성 및 전이에 도입하여 초기 Al₃Pd₂ 형성 및 AlPd상으로서 상전이를 예측하였으며, 이러한 예측은 실험결과와 매우 일치함을 알 수 있었다. 금속/금속계 뿐만 아니라 금속/실리콘계에 대해서 이온선 혼합에 의한 초기 상형성 및 상전이에 관한 연구 및 실험이 현재 진행 중에 있다. Evaporated Al/Pd thin films were irradiated with various doses to produce intermetallic compounds. In order to study the first phase formation and phase sequence, RBS and TEM studies have been used. It was found that the initial phase formed by irradiation of 5×10^(15)Ar^+/㎠ was Al₃Pd₂, while 1.5×10^(16)Ar+/㎠ gave the subsequent phase of AlPd. This phenomenon was analysed using effective heat of formation (ΔH') model. The experimental results agree with that predicted by effective heat of formation model. This model has been extended to predict the first phase formation and phase sequence by ion beam mixing in metal/Si systems as well as metal/metal systems.
엄태호(Tae-Ho Eom),김준모(Jun-Mo Kim),이정(Jeong Lee),정성문(Sung-Mun Jeong),신민호(Min-Ho Shin),이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.7
In order to compensate a loss from the dynamic, a hydrogen fuel cell supplies the hydrogen more than 10% to its rated capacity. It brings the issue that a utilization rate of fuel cell degrades to 10%, therefore, the method is applied which recirculating the emitted hydrogen after their reaction. When their hydrogen recirculating, it results in emitting not the pure hydrogen but impurity, as a result it enables the electric energy to unstable. When a load requires certain power, a membrane of fuel cell has damaged due to voltage drop. In order to develop the charger which charging the energy into battery in fuel cell and battery hybrid system, it requires protection operation according to fuel cell output characteristic results from hydrogen recirculation. In fuel cell charger, selecting the level of protection operation voltage and current through experiment brings significant problem that damage of costly fuel cell. In this paper, we explain the design and control method of the fuel cell simulator which has output characteristic according to current density, temperature of fuel cell including hydrogen recirculation function and verify the validity through simulation and experiment.