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Fe - Al - Nb - B - (Cu)계 초미세결정합금의 자기적 특성
박진영(J. Y. Park),서수정(S. J. Suh),김규진(K. J. Kim),김광윤(K. Y. Kim),노태환(T. H. Noh) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
The magnetic properties and crystallization behaviors of Fe_(83-x)Al_xNb_5B₁₂(X=1~5 at%) alloys were investigated. The Fe_(80)Al₃Nb_5B₁₂ alloy was developed a very good soft magnetic material with ultra-fine grain structure in Fe-Al-Nb-B system alloys. When 1 at% of Cu was added in Fe-Al-Nb-B alloy, the soft magnetic properties were found to improve significantly through the reduction of the grain size upto about 6~7 ㎚ at 450 ℃. The magnetic properties of the Fe_(79)Al₃Nb_5B₁₂Cu₁ alloy were as follows ; μeff(1 ㎑)=26,000, B_(10)=1.45 T, Hc=25mOe, Pc(100 ㎑, 0.2 T)=55 W/kg, respectively.
극박형 Fe - Al - Nd - B - Cu계 초미세결정합금의 자기적 특성
박진영(J. Y. Park),서수정(S. J. Suh),김광윤(K. Y. Kim),노태환(T. H. Noh) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
The effects of Al addition to Fe-B-Nb-Cu alloy for improving the high-frequency magnetic properties and the magnetic properties of ultrathin Fe_(78)Al₄Nb_5B₁₂Cu₁ nanocrystalline alloy ribbons with the thickness less than 10 ㎛ were investigated. It was found that the effective permeability at frequencies over 100 ㎑ was very high and the core loss was very low for the composition Fe_(78)Al₄Nb_5B₁₂Cu₁ alloy. Moreover, the reduction of the ribbon thickness below 10 ㎛ was very effective in improving their permeability and the core loss characteristics up to the ㎒ frequency range. The values of effective permeability at 1 ㎒ and core loss at 0.2 T, 1 ㎒ were 5,000 and 1.4 ㎾/㎏, respectively. It was considered that these results were due to far refined α-Fe phase structure with grain size less than 10 ㎚ and domain structure modification.
3상 Single Stage 방식의 48V/100A급 고효율 고역률 직류 전원장치
박진영(J.Y. Park),김경환(K.H. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper presents a novel, single stage, isolated, three-phase switching rectifier capable of switching at high frequency. The circuit topology provides zero-voltage switching for all switches, output voltage regulation, unity input power factor, all in a single power conversion stage. Operating principle and experimental results in the 48V/100A DC power supply of three-phase single stage method are presented.
나노결정구조 Fe - Nb - B - N 박막의 미세구조 및 자기적 특성
박진영(J. Y. Park),서수정(S. J. Suh),노태환(T. H. Noh),김광윤(K. Y. Kim),김종열(J. Y. Kim),김희중(H. J. Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.5
The microstructure and magnetic properties of Fe-Nb-B-N thin film alloys, which produced by rf magnetron sputtering method in Ar + N₂ mixed gas atmosphere, were investigated. The Fe_(70)Nb₁₄B₁₁N_5 films, annealed at 590℃, exhibit soft magnetic properties: 4 πMs = 16.5 kG, Hc = 0.13 Oe and μ_(eff) (1~10 ㎒) =5,000. The frequency stability of the Fe-Nb-B-N films has also been found to be good up to 10 ㎒.<br/> The Fe-Nb-B-N thin film alloys annealed at 590℃ consist of three phase; fine crystalline α-Fe phase with grain size of about 5~10 ㎚, Nb-B rich amorphous phase and Nb-nitride precipitates with the size of less than 3 ㎚. Annealed Fe-Nb-B films have two phases; α-Fe grains with the size of about 10 ㎚ and NbB rich amorphous phase. The addition of N decreased α-Fe grain size due to the precipitation of NbN. The good magnetic properties of the Fe-Nb-B-N film alloys are due to fine α-Fe grains resulting from the precipitation of NbN.