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Hydrogen decrepitated anisotropic Nd-Fe-B powder: Hydrogen desorption and magnetic properties : 37th Annual conference on magnetism and magnetic materials (1993)

Meisner, G. P. ; Panchanathan, V.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 6482-6484

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The hydrogen decrepitation (HD) process easily pulverizes rapidly solidified, hot-deformed Nd-Fe-B (MQ3) magnets but degrades the magnetic properties. Recovery of high-performance magnetism in HD MQ3 powder has always required hydrogen desorption at temperatures above 600 °C. It is reported that desorption at the relatively low temperature of 240 °C restores magnetic coercivity Hci to above 10 kOe despite residual hydrogen in the material. Desorption between 240 and 580 °C significantly degrades Hci but not the intrinsic magnetic anisotropy. Hydrogen is reabsorbed when the desorbed powder is cooled from above 600 °C to room temperature in the presence of small amounts of residual hydrogen gas. This hydrogen reabsorption strongly degrades the coercivity but does not affect the intrinsic magnetic anisotropy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.352587

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