Rare earth permanent magnet and method for producing the same

Details Rare earth permanent magnet and method for producing the same Rare earth permanent magnet and method for producing the same

1998-10-02

2000-06-27

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, H01F 1057

Patent

active

060802456

ABSTRACT:
A rare earth permanent magnet consisting essentially, by weight, of 27.0-31.0 % of at least one rare earth element including Y, 0.5-2.0 % of B, 0.02-0.15 % of N, 0.25 % or less of O, 0.15 % or less of C, at least one optional element selected from the group consisting of 0.1-2.0 % of Nb, 0.02-2.0 % of Al, 0.3-5.0 % of Co, 0.01-0.5 % of Ga and 0.01-1.0 % of Cu, and a balance of Fe, and a production method thereof. The contents of rare earth element, oxygen, carbon and oxygen in the magnet are regulated within the specific ranges.

REFERENCES:
patent: 4533408 (1985-08-01), Koon
patent: 4990307 (1991-02-01), Camp
patent: 5162064 (1992-11-01), Kim et al.
patent: 5314548 (1994-05-01), Panchanathan et al.
patent: 5405455 (1995-04-01), Kunsunoki et al.
patent: 5431747 (1995-07-01), Takebuchi et al.
patent: 5489343 (1996-02-01), Uchida et al.

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