Magnetically anisotropic spherical powder and method of making s

Details Magnetically anisotropic spherical powder and method of making s Magnetically anisotropic spherical powder and method of making s

1993-05-28

1995-12-12

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 148105, H01F 106

Patent

active

054746230

ABSTRACT:
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 7 kOe.

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I. R. Harris and P. J. McGuinness, "Hydrogen: its use in the processing of NdFeB-type magnets and in the characterization of NdFeB-type alloys and magnets," Proceedings of the Eleventh International Workshop on Rare Earth Magnets and their Applications, Oct. 1990, Carnegie Mellon University Press, Pittsburgh, Pa., pp. 29-48.
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