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http://dx.doi.org/10.4150/KPMI.2016.23.5.391

Investigation on Fe-Hf-B-Nb-P-C Soft Magnetic Powders Prepared by High-Pressure Gas Atomization  

Jeong, Jae Won (Korea Institute of Materials Science)
Yang, Dong-Yeol (Korea Institute of Materials Science)
Kim, Ki Bong (Korea Institute of Materials Science)
Lee, Junhong (Korea Institute of Materials Science)
Kim, Young Ja (Korea Institute of Materials Science)
Lim, Tae-Soo (Korea Institute of Materials Science)
Yang, Sangsun (Korea Institute of Materials Science)
Lee, Min Ha (Korea Institute of Industrial Technology)
Kim, Hwi Jun (Korea Institute of Industrial Technology)
Kim, Yong-Jin (Korea Institute of Materials Science)
Publication Information
Journal of Powder Materials / v.23, no.5, 2016 , pp. 391-396 More about this Journal
Abstract
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 $N_2$ gas. The mean particle diameter of the obtained powders is $25.7{\mu}m$ and $42.1{\mu}m$ for He and $N_2$ gas, respectively. Their crystallographic structure is confirmed to be amorphous throughout the interior when the particle diameter is less than $45{\mu}m$. 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 ${\mu}_r$ 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.
Keywords
soft magnetic; amorphous powders; gas atomization; magnetic powders; Fe-based powders;
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