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

Kohei Otogawa, Toru Asahi, Miho Jinno, Wataru Yamaguchi, Kenta Takagi, Hansang Kwon

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    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.

    Original languageEnglish
    Pages (from-to)716-725
    Number of pages10
    JournalJournal of the Korean Physical Society
    Volume72
    Issue number6
    DOIs
    Publication statusPublished - 2018 Mar 1

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    Keywords

    • Quaternary eutectic alloy
    • SmFeN magnet
    • Sputter coating

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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