H - Electricity – 01 – F
Patent
H - Electricity
01
F
148/5, 117/53
H01F 41/02 (2006.01) B22F 1/00 (2006.01) H01F 1/057 (2006.01) H01F 1/06 (2006.01)
Patent
CA 1317203
C-4017 METHOD FOR MAKING FLAKES OF RE-Fe-B TYPE MAGNETICALLY ALIGNED MATERIAL Abstract of the Disclosure A method and apparatus for producing rare earth (RE), iron, boron type anistropic magnetic material includes process steps of forming dense, substantially magnetically isotropic coarse powder particles of melt-spun alloy with a very fine grain RE2Fe14B 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 includes 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.
588755
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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