한국분말재료학회지 (Journal of Powder Materials)

  • 제23권6호
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  • Pages.447-452
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  • 2016
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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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분말입도에 따른 Nd-Fe-B 소결자석의 미세조직 변화 및 자기적 특성

Microstructure and Magnetic Properties of Nd-Fe-B Sintered Magnet with the Variation of Particle Size

  • 신동원 (인천대학교 신소재공학과) ;
  • 김동환 (성림산업(주) R&D 연구소) ;
  • 박영철 (성림산업(주) R&D 연구소) ;
  • 김정곤 (인천대학교 신소재공학과)
  • Shin, Dongwon (Advanced Materials Science Engineering, Incheon National University) ;
  • Kim, Dong-Hwan (R&D Research center, STARGROUPIND. CO., LTD) ;
  • Park, Young-Cheol (R&D Research center, STARGROUPIND. CO., LTD) ;
  • Kim, Jeong-Gon (Advanced Materials Science Engineering, Incheon National University)
  • 투고 : 2016.08.16
  • 심사 : 2016.11.15
  • 발행 : 2016.12.28
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초록

Neodymium-iron-boron (Nd-Fe-B) sintered magnets have excellent magnetic properties such as the remanence, coercive force, and the maximum energy product compared to other hard magnetic materials. The coercive force of Nd-Fe-B sintered magnets is improved by the addition of heavy rare earth elements such as dysprosium and terbium instead of neodymium. Then, the magnetocrystalline anisotropy of Nd-Fe-B sintered magnets increases. However, additional elements have increased the production cost of Nd-Fe-B sintered magnets. Hence, a study on the control of the microstructure of Nd-Fe-B magnets is being conducted. As the coercive force of magnets improves, the grain size of the $Nd_2Fe_{14}B$ grain is close to 300 nm because they are nucleation-type magnets. In this study, fine particles of Nd-Fe-B are prepared with various grinding energies in the pulverization process used for preparing sintered magnets, and the microstructure and magnetic properties of the magnets are investigated.

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참고문헌

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