Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Investigation on Fe-Hf-B-Nb-P-C Soft Magnetic Powders Prepared by High-Pressure Gas Atomization

고압 가스 분무법을 이용한 Fe-Hf-B-Nb-P-C 연자성 분말 제조 및 특성 평가

  • 정재원 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 양동열 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 김기봉 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 이준홍 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 김영자 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 임태수 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 양상선 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) ;
  • 이민하 (한국생산기술연구원, 뿌리산업연구부문) ;
  • 김휘준 (한국생산기술연구원, 뿌리산업연구부문) ;
  • 김용진 (한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부)
  • Received : 2016.09.20
  • Accepted : 2016.10.20
  • Published : 2016.10.28
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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

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