0626703-A2 cites 4 patents.

A method of forming a magnetically anisotropic powder includes the steps of forming a substantially spherical powder having a major magnetic phase and an average particle size of less than about 200 microns, diffusing hydrogen into the spherical powder at elevated temperatures in an amount sufficient to disproportionate the major magnetic phase, and desorbing the hydrogen by heating the disproportionated powder under vacuum. The magnetic material from which the spherical powder is formed may be a rare earth-transition metal-boron alloy including at least one element from the iron group, at least one rare earth element, and boron.; A method of forming a bonded magnet containing magnetically anisotropic particles further includes the steps of mixing the dehydrogenated powder with a binder to form a mixture, and aligning and magnetizing the powder particles in the mixture in a magnetic field. Bonded magnets containing spherical, magnetically anisotropic particles of the invention have intrinsic coercivities in excess of 7kOe.

Title
Magnetically anisotropic spherical powder.
Application Number
EP19940303386 19940511
Publication Number
0626703 (A2)
Application Date
May 11, 1994
Publication Date
November 30, 1994
Inventor
Liang Yu Lan
US
Liu Wan Li
US
Ma Bao Min
US
Assignee
Rhone Poulenc Spec Chim
US
IPC
H01F 01/053
H01F 01/032
B22F 01/00
H01F 01/06
H01F 01/057
B22F 01/00
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