Hydrogen absorption of NdDyFeCoNbCuB sintered magnets

Jianjun Luo (1) , Patricia de Rango (2) , Daniel Fruchart (3) , Jinna Mei (4) , Rui Hu (1) , Jinshan Li (1) , Lian Zhou (1)

1 State Key Laboratory of Solidification Processing
2 NEEL - MRS - Matériaux, Rayonnements, Structure
3 NEEL - MNM - Micro et NanoMagnétisme
4 CRETA - Consortium de Recherches pour l'Emergence des Technologies Avancées

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 degrees C, hydrogenation of the tetragonal (Phi) phase in the temperature range of 185-220 degrees C, as well as the disproportionation of the (D phase that occurred in a broad temperature range from around 500 to 800 degrees C. The hydrogenation kinetics measurements indicated that hydrogen absorption of the bulk magnets at 50 degrees C absorbed more hydrogen than at 150 degrees C, although this procedure was slower at 50 degrees C than at 150 degrees C. This phenomenon was discussed by means of pressure-concentration-temperature (p-c-T) diagrams.

Mots clés: rare earths; hydrogen absorption; hydrogen desorption; sintered NdDyFeCoNbCuB magnets

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Jianjun Luo, Patricia de Rango, Daniel Fruchart, Jinna Mei, Rui Hu, et al.. Hydrogen absorption of NdDyFeCoNbCuB sintered magnets. Journal of Rare Earths, 2009, 27 (3), pp.520-524. ⟨10.1016/S1002-0721(08)60281-1⟩. ⟨hal-00716439⟩