Method for producing permanent magnet alloy particles for use in

Details Method for producing permanent magnet alloy particles for use in Method for producing permanent magnet alloy particles for use in

1989-05-05

1991-02-19

Morris, Theodore

Specialized metallurgical processes, compositions for use therei

Processes

Producing solid particulate free metal directly from liquid...

75349, 148101, 148105, H01F 1053, H01F 106

Patent

active

049941097

ABSTRACT:
A method for producing permanent magnet alloy particles suitable for use in producing bonded permanent magnets. A melt or molten mass of a permanent magnet alloy having at least one rare earth element, at least one transition element, preferably iron, and boron is produced. The melt is inert gas atomized to form spherical particles within the size range of 1 to 1000 microns. The particles are heat treated in a nonoxidizing atmosphere for a time at temperature to significantly increase the intrinsic coercivity of the particles without sintering the particles to substantially full density. Thereafter, the particles are separated to produce a discrete particle mass. The particles during heat treatment may be maintained in motion to prevent sintering thereof.

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