- Microstructure and Soft Magnetic Properties of Fe-6.5 wt.%Si Sheets Fabricated by Powder Hot Rolling
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Myung Shin Kim, Do Hun Kwon, Won Sik Hong, Hwi Jun Kim
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J Korean Powder Metall Inst. 2017;24(2):122-127. Published online April 1, 2017
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DOI: https://doi.org/10.4150/KPMI.2017.24.2.122
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Abstract
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Fe-6.5 wt.% Si alloys are widely known to have excellent soft magnetic properties such as high magnetic flux density, low coercivity, and low core loss at high frequency. In this work, disc-shaped preforms are prepared by spark plasma sintering at 1223 K after inert gas atomization of Fe-6.5 wt.% Si powders. Fe-6.5 wt.% Si sheets are rolled by a powder hot-rolling process without cracking, and their microstructure and soft magnetic properties are investigated. The microstructure and magnetic properties (saturation magnetization and core loss) of the hot-rolled Fe-6.5 wt.% Si sheets are examined by scanning electron microscopy, electron backscatter diffraction, vibration sample magnetometry, and AC B–H analysis. The Fe-6.5 wt.% Si sheet rolled at a total reduction ratio of 80% exhibits good soft magnetic properties such as a saturation magnetization of 1.74 T and core loss (W5/1000) of 30.7 W/kg. This result is caused by an increase in the electrical resistivity resulting from an increased particle boundary density and the oxide layers between the primary particle boundaries.
- Investigation on Fe-Hf-B-Nb-P-C Soft Magnetic Powders Prepared by High-Pressure Gas Atomization
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Jae Won Jeong, Dong-Yeol Yang, Ki Bong Kim, Junhong Lee, Young Ja Kim, Tae-Soo Lim, Sangsun Yang, Min Ha Lee, Hwi Jun Kim, Yong-Jin Kim
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J Korean Powder Metall Inst. 2016;23(5):391-396. Published online October 1, 2016
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DOI: https://doi.org/10.4150/KPMI.2016.23.5.391
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In this study, ultra-fine soft-magnetic micro-powders are prepared by high-pressure gas atomization of an Fe-based alloy, Fe-Hf-B-Nb-P-C. Spherical powders are successfully obtained by disintegration of the alloy melts under high-pressure He or N2 gas. The mean particle diameter of the obtained powders is 25.7 μm and 42.1 μm for He and N2 gas, respectively. Their crystallographic structure is confirmed to be amorphous throughout the interior when the particle diameter is less than 45 μm. The prepared powders show excellent soft magnetic properties with a saturation magnetization of 164.5 emu/g and a coercivity of 9.0 Oe. Finally, a toroidal core is fabricated for measuring the magnetic permeability, and a μr of up to 78.5 is obtained. It is strongly believed that soft magnetic powders prepared by gas atomization will be beneficial in the fabrication of high-performance devices, including inductors and motors.
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- Optimization of Densification Behavior of a Soft Magnetic Powder by Discrete Element Method and Machine Learning
Jungjoon Kim, Dongchan Min, Suwon Park, Junhyub Jeon, Seok-Jae Lee, Youngkyun Kim, Hwi-Jun Kim, Youngjin Kim, Hyunjoo Choi MATERIALS TRANSACTIONS.2022; 63(10): 1304. CrossRef - Optimizing the magnetic properties of Fe-based amorphous powder by adjusting atomic structures from vitrification at different temperatures
Song-Yi Kim, Hye-Ryeong Oh, Hyeon-Ah Kim, A-Young Lee, Hwi-Jun Kim, Sang-Sun Yang, Yong-Jin Kim, Hyun-Joo Choi, Il-Hyun Kim, Hyun-Gil Kim, Jürgen Eckert, Jong-Ryoul Kim, Min-Ha Lee Journal of Applied Physics.2019;[Epub] CrossRef - Soft magnetic properties of Fe-based amorphous/nanocrystalline hybrid materials
Yeonjoo Lee, Jonggyu Jeon, Seungjin Nam, Teasuk Jang, Hwijun Kim, Minwoo Lee, Yongjin Kim, Dongyeol Yang, Kyeongsik Min, Hyunjoo Choi Powder Technology.2018; 339: 440. CrossRef
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