철기(Fe Based) 나노결정질 합금 분말코어의 코팅제 및 입도가 연자기적 특성에 미치는 영향

다국어 초록 (Multilingual Abstract)

This is a basic research for improving soft magnetic property of Fe based nano crystalline alloy powder core. The main study is done around characteristics of permeability, core loss, and DC bias depending on amount of insulation coating agent and particle size. First, Fe<SUB>73.5</SUB>Si<SUB>13.5</SUB>B<SUB>9</SUB>Nb₃Cu₁ amorphous alloy ribbon was fabricated by using the planar flow casting (PFC) device. Then, heat treatment and ball milling were done to obtain alloy powder. The amount of polyether imide (PEI) added to it was varied by 0.5, 1.0, 2.0, 2.5 wt% to have compression molding into 16 ton/㎠. After going through crystalline heat treatment, the made toroidal nano crystalline powder core (OD12.7 mm*ID7.62 mm*H4.75 mm) had smaller permeability as amount of insulation coating agent decreases. However, it was found out that core loss and DC bias characteristics have been improved. The reason for this results were expected to be because green density of power core decreases as amorphous alloy powder particles become smaller as amount of alloy powder insulation coating agent increases, it was determined that 1 wt% of insulation coating agent is appropriate. Also, for powder core made based on alloy powder size with amount of insulation coating agent fixed at 1 wt%, effective permeability and core loss were outstanding as particle size became bigger. However, characteristics of DC bias became worse as applied DC field increases. This is expected to be due to insulation effect, residual pores, or molding density of powder core resulting from thickness of coating on surface of alloy powder.

참고문헌 (Reference)

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3 K. B. Choi, Yonsei University 2004

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7 김휘준, "고에너지효율 연자성 복합 분말 소재의 연구개발 동향" 한국자기학회 21 (21): 77-82, 2011

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9 노태환, "Fe73.5Cu1Nb3Si15.5B7 나노 결정립 합금 분말 코아의 자기적 특성" 한국자기학회 14 (14): 7-12, 2004