한국분말재료학회지 (Journal of Powder Materials)

  • 제15권6호
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  • Pages.471-476
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  • 2008
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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반복 열처리한 Nd-Fe-B 소결 자석의 미세구조 제어 및 자성특성 평가

Microstructure Control and Magnetic Property of Nd-Fe-B Sintered Magnets After Cyclic Heat Treatment

  • 김세훈 (한양대학교 신소재공학과) ;
  • 김훈섭 (한양대학교 신소재공학과) ;
  • 김동환 (한국기계연구원부설 재료연구소) ;
  • 김영도 (한양대학교 신소재공학과)
  • Kim, Se-Hoon (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Hoon-Sup (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Dong-Hwan (Korea Institute of Materials Science) ;
  • Kim, Young-Do (Division of Materials Science and Engineering, Hanyang University)
  • 발행 : 2008.12.28
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초록

Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially for driving motors of hybrid and electric vehicles. The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity. Therefore, a post-sintering process like heat-treatment is required for improving the magnetic properties of Nd-Fe-B sintered magnets. In this study, cyclic heat treatment was performed at temperatures between $350^{\circ}C$ and $450^{\circ}C$ up to 16 cycles in order to control microstructures such as size and shape of the Nd-rich phase without grain growth of the $Nd_{2}Fe_{14}B$ phase. The 2 cycles specimen at this temperature range showed more homogeneous microstructure which leads to higher coercivity of 35 kOe than as-sintered one.

키워드

참고문헌

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피인용 문헌

  1. Magnetic Properties and Sintering Behavior of (Nd,Dy)-Fe-B Permanent Magnet by Spark Plasma Sintering vol.19, pp.2, 2012, https://doi.org/10.4150/KPMI.2012.19.2.105