Permanent magnet and the method for producing the same

Details Permanent magnet and the method for producing the same Permanent magnet and the method for producing the same

1991-08-26

1993-06-08

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 13, 419 29, 419 57, 419 60, H01F 102

Patent

active

052175413

ABSTRACT:
A permanent magnet essentially consisting of in weight percent, 60% to 68% at least one transition element by weight, 30% to 38% at least one rare earth element by weight, 0.1% to 1.5% nitrogen by weight, and 0.8% to 1.5% boron by weight is disclosed. A method for producing the permanent magnet containing at least one rear element, at least one rare earth element, nitrogen and boron includes melting, cooling, milling, magnetizing, and compacting the transition element, the rare earth element and boron to form a green compact, and then sintering the green compact in nitrogen atmosphere having a constant partial pressure for 1 to several hours to form the permanent magnet.

REFERENCES:
patent: 3970484 (1976-07-01), Doser
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4888512 (1989-12-01), Shimizu
patent: 4902357 (1990-02-01), Imaizumi

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