H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 41/02 (2006.01) B22F 1/00 (2006.01) B22F 9/22 (2006.01) C22C 1/04 (2006.01) H01F 1/057 (2006.01)
Patent
CA 2133671
It is an object of the present invention to provide a method of producing sintered- or bond- rare earth element ? iron ? boron magnets obtainable easily and superior in magnetic properties with stable performance. The method of producing sintered rare earth element ? iron ? boron magnets according to the present invention is characterized by that it comprises steps of mixing in a scheduled ratio an acicular iron powder coated with a coating material, a rare earth element powder coated with a coating material and a boron powder coated with a coating material, and subjecting the mixture to compression molding followed by sintering of the molded mixture in the presence of a magnetic field. The method of producing bond rare earth element ? iron ? boron magnets according to the present invention is characterized by that it comprises steps of preparing a magnet powder by hydrogen-disintegration of the above-mentioned sintered magnet wherein a hydrogen-occluded sintered magnet resulted from heating the magnet under hydrogen at atmosphere is subjected to hydrogen emission under substantial vacuum to cause disintegration of the hydrogen-occluded sintered magnet, coating the magnet powder with a coating material, mixing the coated magnet powder with a binder, and compression molding the mixture under heating in the presence of a magnetic field.
Mccarthy Tetrault Llp
Takahashi Yasunori
LandOfFree
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