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Journal of the Korean Physical Society

, Volume 72, Issue 6, pp 716–725 | Cite as

Coercivity Recovery Effect of Sm-Fe-Cu-Al Alloy on Sm2Fe17N3 Magnet

  • Kohei Otogawa
  • Toru Asahi
  • Miho Jinno
  • Wataru Yamaguchi
  • Kenta Takagi
  • Hansang Kwon
Article
  • 40 Downloads

Abstract

The potential of a Sm-Fe-Cu-Al binder for improvement of the magnetic properties of Sm2Fe17N3 was examined. Transmission electron microscope (TEM) observation of a Sm-Fe-Cu-Al alloy-bonded Sm2Fe17N3 magnet which showed high coercivity revealed that the Sm-Fe-Cu-Al alloy had an effect of removing the surface oxide layer of the Sm2 Fe17N3 grains. However, the Sm-Fe-Cu-Al binder was contaminated by carbon and nitrogen, which originated from the organic solvent used as the milling medium during pulverization. To prevent carbon and nitrogen contamination, the Sm-Fe- Cu-Al alloy was added directly on the surface of the Sm2Fe17N3 grains by sputtering. Comparing the recovered coercivity per unit amount of the added binder the uncontaminated binder-coated sample had a higher coercivity recovery effect than the milled binder-added sample. These results suggested that sufficient addition of the contamination-free Sm-Fe-Cu-Al binder has the possibility to reduce the amount of binder necessary to produce a high coercive Sm2Fe17N3 magnet.

Keywords

Sm2Fe17N3 magnet Sputter coating Quaternary eutectic alloy 

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Copyright information

© The Korean Physical Society 2018

Authors and Affiliations

  • Kohei Otogawa
    • 1
  • Toru Asahi
    • 1
  • Miho Jinno
    • 2
  • Wataru Yamaguchi
    • 2
  • Kenta Takagi
    • 2
  • Hansang Kwon
    • 3
  1. 1.Department of Advanced Science and Engineering, Graduate School of Advanced Science and EngineeringWaseda UniversityTokyoJapan
  2. 2.Magnetic Powder Metallurgy Research CenterNational Institute of Advanced Industrial Science and Technology (AIST)NagoyaJapan
  3. 3.Department of Materials System EngineeringPukyong National UniversityBusanKorea

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