Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet
| Autor: | Michael S. Kesler, Michael A. McGuire, Ikenna C. Nlebedim, Xubo Liu, Matthew F. Besser, Matthew J. Kramer |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Hydrogen Isotropy chemistry.chemical_element Coercivity 01 natural sciences Electronic Optical and Magnetic Materials Crystal chemistry Magnet Phase (matter) 0103 physical sciences Texture (crystalline) Electrical and Electronic Engineering Anisotropy |
| Zdroj: | IEEE Transactions on Magnetics. 57:1-4 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2020.3022739 |
| Popis: | 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 Nd2Fe14B 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. |
| Databáze: | OpenAIRE |
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