Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated with the formation of c -axis crystal texture of Nd 2...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:IEEE transactions on magnetics 2021-02, Vol.57 (2), p.1-4
Hauptverfasser: Liu, X. B., Kesler, M. S., Besser, M. F., Kramer, M. J., McGuire, M. A., Nlebedim, I. C.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated with the formation of c -axis crystal texture of Nd 2 Fe 14 B phase. There exists a critical hydrogen pressure, P_{\mathrm {crit}} , during hydrogen-disproportionation stage, that promotes the formation of c -axis crystal texture. When processing hydrogen pressure is higher than P_{\mathrm {crit}} , the formation of c -axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of P_{\mathrm {crit}} is ascribed to the thermodynamics and kinetics origin during HDDR process.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2020.3022739