Hydrogen absorption of NdDyFeCoNbCuB sintered magnets

Hydrogen absorption and desorption characteristics for high coercivity NdDyFeCoNbCuB sintered bulk magnets were studied, by differential scanning calorimetry （DSC） measurement and hydrogenation kinetics measurement. The DSC measurements showed that hydrogenation of Nd-rich phase occurred in the temp...

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Bibliographic Details
Published in:Journal of rare earths 2009-06, Vol.27 (3), p.520-524
Main Author: 罗建军 De Rango P Fruchart D 梅金娜 胡锐 李金山 周廉
Format: Article
Language:English
Subjects:
Condensed Matter
DSC
hydrogen absorption
hydrogen desorption
Materials Science
Physics
rare earths
sintered NdDyFeCoNbCuB magnets
加氢动力学
动力学测量
吸收比
差示扫描量热
温度范围
烧结磁体
解吸特性
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Summary:Hydrogen absorption and desorption characteristics for high coercivity NdDyFeCoNbCuB sintered bulk magnets were studied, by differential scanning calorimetry （DSC） measurement and hydrogenation kinetics measurement. The DSC measurements showed that hydrogenation of Nd-rich phase occurred in the temperature range of 40-185 ℃, hydrogenation of the tetragonal （Ф） phase in the temperature range of 185-220 ℃, as well as the disproportionation of the Ф phase that occurred in a broad temperature range from around 500 to 800 ℃. The hydrogenation kinetics measurements indicated that hydrogen absorption of the bulk magnets at 50 ℃ absorbed more hydrogen than at 150 ℃, although this procedure was slower at 50 ℃ than at 150℃. This phenomenon was discussed by means of pressure-concentration-temperature （p-c-T） diagrams.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(08)60281-1