Method of producing sintered--or bond-rare earth element-iron-bo

Details Method of producing sintered--or bond-rare earth element-iron-bo Method of producing sintered--or bond-rare earth element-iron-bo

1995-09-25

1997-07-22

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148103, 252 6254, 419 12, H01F 1057

Patent

active

056500211

ABSTRACT:
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 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.

REFERENCES:
patent: 4541877 (1985-09-01), Stadelmaier et al.
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4844751 (1989-07-01), Schultz

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