Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Coercivity Enhancement of (Nd,Dy)-Fe-B Sintered Magnet by Microstructure Control

미세구조 제어를 통한 (Nd,Dy)-Fe-B 소결자석의 보자력 증가

  • Kim, Jin-Woo (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Se-Hoon (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Young-Do (Department of Materials Science and Engineering, Hanyang University)
  • Received : 2011.01.03
  • Accepted : 2011.01.28
  • Published : 2011.02.28
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Abstract

Sintered Nd-Fe-B magnets are widely used in many fields such as motors, generators, actuators, microwaves and so on due to their excellent magnetic properties. Many researchers have shown that the Nd-rich phase was essentially important for high magnet properties. In this study, we focused on controlling of the Nd-rich phase to enhance magnetic properties by the cyclic sintering process. Nd-Fe-B based sintered magnets were prepared by isothermal sintering and cyclic sintering processes. Magnetic properties and microstructure of the magnets were investigated. The coercivity was enhanced from 21.2 kOe to 23.27 kOe after 10 cycles of the sintering. The Nd-rich phase was effectively penetrated into the grain boundary between the $Nd_2Fe_{14}B$ grains by the cyclic sintering.

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