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고압 가스 분무법을 이용한 Fe-Hf-B-Nb-P-C 연자성 분말 제조 및 특성 평가
정재원,양동열,김기봉,이준홍,김영자,임태수,양상선,이민하,김휘준,김용진,Jeong, Jae Won,Yang, Dong-Yeol,Kim, Ki Bong,Lee, Junhong,Kim, Young Ja,Lim, Tae-Soo,Yang, Sangsun,Lee, Min Ha,Kim, Hwi Jun,Kim, Yong-Jin 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.5
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.