Sawatzki, Simon ; Dirba, Imants ; Schultz, Ludwig ; Gutfleisch, Oliver (2013)
Electrical and magnetic properties of hot-deformed Nd-Fe-B magnets with different DyF3 additions.
In: Journal of Applied Physics, 114 (13)
doi: 10.1063/1.4822026
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The effect of deformation and DyF3 additions on the electrical resistivity and the magnetic performance has been studied in hot-deformed Nd-Fe-B melt-spun ribbons and correlated with respective microstructures. Despite the nanocrystallinity of hot-compacted magnets, the specific electrical resistivity measured by four-point-method was shown to be comparable with that of sintered magnets. Die-upsetting reduces electrical resistivity within the magnetically hard plane because of an enhanced shape anisotropy of the grains. The addition of DyF3 overcompensates this reduction due to the presence of electrically insulating Dy-F rich inclusions and thus reduces eddy current losses within the magnet. Magnetic measurements reveal an increase in coercivity without a change in remanence for die-upset magnets with a total height reduction of 63% and 1.2 wt. % Dy (1.6 wt. %DyF3). Both properties, remanence and coercivity, demonstrate an effective reduction in heavy rare earth Dy for Nd-Fe-B magnets.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Sawatzki, Simon ; Dirba, Imants ; Schultz, Ludwig ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Electrical and magnetic properties of hot-deformed Nd-Fe-B magnets with different DyF3 additions |
| Sprache: | Englisch |
| Publikationsjahr: | 2013 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 114 |
| (Heft-)Nummer: | 13 |
| DOI: | 10.1063/1.4822026 |
| Kurzbeschreibung (Abstract): | The effect of deformation and DyF3 additions on the electrical resistivity and the magnetic performance has been studied in hot-deformed Nd-Fe-B melt-spun ribbons and correlated with respective microstructures. Despite the nanocrystallinity of hot-compacted magnets, the specific electrical resistivity measured by four-point-method was shown to be comparable with that of sintered magnets. Die-upsetting reduces electrical resistivity within the magnetically hard plane because of an enhanced shape anisotropy of the grains. The addition of DyF3 overcompensates this reduction due to the presence of electrically insulating Dy-F rich inclusions and thus reduces eddy current losses within the magnet. Magnetic measurements reveal an increase in coercivity without a change in remanence for die-upset magnets with a total height reduction of 63% and 1.2 wt. % Dy (1.6 wt. %DyF3). Both properties, remanence and coercivity, demonstrate an effective reduction in heavy rare earth Dy for Nd-Fe-B magnets. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Mär 2014 09:56 |
| Letzte Änderung: | 10 Mär 2014 09:56 |
| PPN: | |
| Sponsoren: | We thank the BMWi (Bundesministerium f. Wirtschaft und Technologie) via IGF (Industrielle Gemeinschaftsforschung), AiF (Allianz Industrie Forschung), and FVA (Forschungsvereinigung Antriebstechnik e.V.) , as well as the DBU (Deutsche Bundesstifung Umwelt) for financial support. |
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