Production of anisotropic Sm-Fe-N magnet sheets by modified powder rolling

•Anisotropic Sm-Fe-N sheets were produced by a newly modified powder rolling.•The process can be a continuous process and suitable for mass production.•No bonding medium was used unlike the many works on consolidation of Sm-Fe-N magnets.•A moderate (BH)max value of 123 kJ/m3 was obtained.•Demonstrat...

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Veröffentlicht in:Materials letters 2021-07, Vol.294, p.129815, Article 129815
Hauptverfasser: Hosokawa, Akihide, Yoneyama, Natsuki, Nakanowatari, Isao, Eguchi, Haruki, Takagi, Kenta
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Sprache:eng
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Zusammenfassung:•Anisotropic Sm-Fe-N sheets were produced by a newly modified powder rolling.•The process can be a continuous process and suitable for mass production.•No bonding medium was used unlike the many works on consolidation of Sm-Fe-N magnets.•A moderate (BH)max value of 123 kJ/m3 was obtained.•Demonstrated that alignment of the powder compact remains after severe deformation of rolling. We developed a modified powder rolling technique wherein encapsulating Sm-Fe-N powders inside metallic sheaths made it possible to consolidate the aligned monocrystalline Sm-Fe-N fine particles into a form of sheet at elevated temperatures under nitrogen atmosphere. No bonding medium was used in this method. This paper demonstrates the successful cases of production of anisotropic Sm-Fe-N magnets by this new technique. In a good case, the Sm-Fe-N magnet sheet exhibited a maximum energy product of 123 kJ/m3 which is comparable with the reported highest values in the literature but still not strong as practical permanent magnets. A possible strategy to improve magnet performance further is briefly discussed.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.129815