Metal treatment – Stock – Magnetic
Patent
1996-05-06
1999-01-12
Sheehan, John
Metal treatment
Stock
Magnetic
420 83, 420121, H01F 1057
Patent
active
058581235
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: 4990307 (1991-02-01), Camp
patent: 5162064 (1992-11-01), Kim et al.
patent: 5431747 (1995-07-01), Takebuchi et al.
patent: 5489343 (1996-02-01), Uchida et al.
Takahashi Masahiro
Taniguchi Fumitake
Uchida Kimio
Hitachi Metals Ltd.
Sheehan John
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