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 |
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Format: | Artikel |
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. |
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ISSN: | 0167-577X 1873-4979 |
DOI: | 10.1016/j.matlet.2021.129815 |