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가스분무법으로 제조한 MPP 분말코어의 자기적 특성에 미치는 열처리 효과
김구현(G. H. Kim),노태환(T. H. Noh),김광윤(K. Y. Kim),정인범(I. B. Jeong),최광보(G. B. Choi) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.4
The effects of heat-treatment with magnetic or non-magnetic field on magnetic properties of gas-atomized MPP dust cores subjected to various cooling processes after annealing were investigated. Upon magnetic-field annealing, ac permeability and core loss decreased with the increase of cooling rate, which were attributed to the generation of inhomogeneous internal stress and anomalous eddy current loss, respectively. It was not observed the formation of ordered phase and the related change in magnetic properties at the cooling stage for MPP dust cores. In MPP alloys, magnetic anisotropy was easily induced through the directional order, and permeability and core loss were changed under the conditions of low cooling rate and magnetic annealing.
가스 분무법으로 제조된 NixFe100-x(x=40~50) 퍼멀로이 분말 및 압분 코아의 자기적 특성
노태환(T. H. Noh),김구현(G. H. Kim),최광보(G. B. Choi),김광윤(K. Y. Kim) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.6
We investigated the magnetic properties of High Flux-type Ni_xFe_(100-x)(x=40~50, wt.%) permalloy powders and dust cores. The powder was prepared by conventional gas atomization in mass production scale. At the composition of Ni_(45)Fe_(55), saturation magnetization was maximum. In case of lower Ni content than X=45, the Ms decreased largely with the decrease in Ni content, which is due to the invar effect. The permeability of compressed powder cores increased with the decrease in Ni content, which was considered to be due to the decrease in the magnetostriction. In addition, the dust core with Ni=45% showed the lowest core loss because of the increase in electrical resistivity leading to the low eddy current loss. From the better frequency dependence of permeability, larger Q value and superior DC bias characteristics of Ni=45 % than those of Ni=50% core, it was confirmed that the 45%Ni-55%Fe powder alloy was better material for the dust core than commercial High Flux core materials.