Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Inward Diffusion of Tb Ions and the Magnetic Properties of the Nd-Fe-B Magnets

열처리 조건에 따른 Tb이온의 확산 및 Nd-Fe-B 자석의 자기적 특성

  • Oh, Seong-Uk (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Kim, Dong-Whan (Stargroupind. Co.) ;
  • Gong, Gun-Seung (Stargroupind. Co.) ;
  • Heo, Young-Woo (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Kim, Jeong-Joo (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Lee, Joon-Hyung (School of the Materials Science and Engineering, Kyungpook National University)
  • Received : 2016.08.30
  • Accepted : 2016.11.04
  • Published : 2017.01.01

Abstract

In this study, the effect of Tb inward diffusion on the magnetic properties of the Nd-Fe-B sintered magnets was studied. After sintering of the magnets, $TbF_3$ slurries were dip-coated on the surface of the samples, then heat-treatment was followed for $TbF_3$ diffusion. The element distribution in the magnets and the diffusion profiles of Tb ions were analyzed by an EPMA (electron probe micro-analyzer). Prolonged heat treatment resulted in a deeper diffusion length of Tb ions. Coercivity of the $1^{st}$ heat-treated sample showed 21.86 kOe, while that of the $1^{st}$, $2^{nd}$ heat-treated and annealed sample revealed 34 kOe.

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Acknowledgement

Supported by : Ministry of Trade, Industry & Energy (MOTIE, Korea)

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