Method of producing polar anisotropic rare earth magnet

Details Method of producing polar anisotropic rare earth magnet Method of producing polar anisotropic rare earth magnet

1989-11-17

1991-02-05

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 12, 419 30, 419 38, 419 39, 75244, B22F 324

Patent

active

049903063

ABSTRACT:
The invention relates to a method of producing a sintered Nd-Fe-B magnet which has a cylindrical or annular shape and is magnetized in radial directions with polar anisotropic orientation. In a cylindrical mold cavity filled with a Nd-Fe-B magnetic alloy powder a pulse of magnetic field is produced so as to cause polar anisotropic orientation of the magnetic powder with at least six poles distributed around the circumference, and a pulse-like pressure is applied to the powder in the mold cavity to compact the powder into a cylindrically shaped body while the pulse of magnetic field is lasting. The shaped body is sintered, and subsequently the side surface of the sintered body is abraded to remove projecting regions, which are attributed to anisotropic shrinkage during sintering, until the surface becomes accurately cylindrical.

REFERENCES:
patent: 4600555 (1986-07-01), Shimizu
patent: 4678364 (1987-04-01), Charonnat et al.
patent: 4836868 (1989-06-01), Yajima et al.
patent: 4888506 (1989-12-01), Umehava
patent: 4888512 (1989-12-01), Shimizu

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