Hydrogenation of Nd-Fe-B magnet powder under a high pressure of hydrogen
Y. Kataoka, Y. Kawamoto, T. Ono, M. Tsubota, J. Kitagawa
TL;DR
This study explores the high-pressure hydrogenation process of Nd2Fe14B magnet powder, revealing nearly complete decomposition into NdH2+x and alpha-Fe at 600°C, with implications for magnetic material processing.
Contribution
First investigation of Nd2Fe14B hydrogenation under high hydrogen pressure, demonstrating effective decomposition at elevated temperature.
Findings
Almost complete decomposition into NdH2+x and alpha-Fe at 600°C
Hydrogen desorption does not occur during furnace cooling
Long heat-treatment time is required for sufficient hydrogenation
Abstract
The hydrogenation of Nd2Fe14B under a high pressure of hydrogen has been investigated for the first time. At the heat-treatment temperature of 600 degree C, the almost complete decomposition of Nd2Fe14B into NdH2+x and alpha-Fe is observed, although a rather long heat-treatment time is necessary to achieve the sufficient hydrogenation. The desorption of hydrogen from NdH2+x does not occur in the furnace-cooling process.
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Taxonomy
TopicsMagnetic Properties of Alloys · Superconducting Materials and Applications · Hydrogen Storage and Materials