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...
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Veröffentlicht in: | IEEE transactions on magnetics 2021-02, Vol.57 (2), p.1-4 |
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Sprache: | eng |
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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. |
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ISSN: | 0018-9464 1941-0069 |
DOI: | 10.1109/TMAG.2020.3022739 |