Method for making flakes of RE-Fe-B type magnetically aligned ma

Details Method for making flakes of RE-Fe-B type magnetically aligned ma Method for making flakes of RE-Fe-B type magnetically aligned ma

1988-04-28

1989-09-19

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 148120, H01F 106

Patent

active

048678090

ABSTRACT:
A method and apparatus for producing rare earth (RE), iron, boron type anisotropic magnetic material includes process steps of forming dense substantially magnetically isotropic coarse powder particles of melt spun alloy with a very fine grain RE.sub.2 Fe.sub.14 B phase; heating such particles (e.g. by plasma spraying) and directing them against hot working rolls at the entrance thereof; and hot deforming the particles while in a plastic state between surfaces of the hot working rolls so as to cause crystallites in the particles to be oriented along a crystallographically preferred magnetic axis. The particles are cooled and ejected from the rolls as individual anisotropic permanently magnetic flakes. Apparatus including a feed hopper with a carrier tube pressurized to direct isotropic particles to the arc of a plasma spray torch. The torch softens the particles and sprays them in a spatter pattern. The apparatus further includes a pair of counter-rotating rollers with a gap therebetween to receive the spatter pattern and to shape individual plastic particles into flake form.

REFERENCES:
patent: 4496395 (1985-01-01), Croat
patent: 4597938 (1986-01-01), Matsuura et al.
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4684406 (1987-08-01), Matsuura et al.
patent: 4756775 (1988-07-01), Croat
Lee, R. W., "Hot-Pressed Neodymium-Iron-Boron Magnets," Applied Physics Letters, 46, (8), Apr. 15, 1985.

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