Journal of Powder Materials

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Investigation on Fe-Hf-B-Nb-P-C Soft Magnetic Powders Prepared by High-Pressure Gas Atomization: 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; J Korean Powder Metall Inst. 2016;23(5):391-396. Published online October 1, 2016; 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

Synthesis of Ni-based Metallic Glass Composite Fabricated by Spark Plasma Sintering: Song Yi Kim, Bo Kyeong Guem, Min Ha Lee, Bum Sung Kim; J Korean Powder Metall Inst. 2013;20(1):33-36.; DOI: https://doi.org/10.4150/KPMI.2013.20.1.033

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A bulk metallic glass-forming alloy, Ni_59Zr_20Ti_16Si_2Sn_3 metallic glass powders was used for good commercial availability and good formability in supercooled liquid region. In this study, the Ni-based metallic glass was synthesized using by high pressure gas atomized metallic glass powders. In order to create a bulk metallic glass sample, the Ni_59Zr_20Ti_16Si_2Sn_3 metallic glass powders with ball-milled Ni-based amorphous powder with 40%vol brass powder and Cu powder for 20 hours. The composite specimens were prepared by Spark Plasma Sintering for the precursor. The SPS was performed at supercooled liquid region of Ni-based metallic glass. The amorphous structure of the final sample was characterized by SEM, X-ray diffraction and DSC analysis.

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Machinability Evaluation of Hybrid Ti2Ceramic Composites with Conductivity in Micro Electrical Discharge Drilling Operation
Jae-Young Heo, Young-Keun Jeong, Myung-Chang Kang, Ahmed Busnaina
Journal of Korean Powder Metallurgy Institute.2013; 20(4): 285. CrossRef

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