Alloy used for production of a rare-earth magnet and method for

Details Alloy used for production of a rare-earth magnet and method for Alloy used for production of a rare-earth magnet and method for

1997-11-12

1999-09-07

Sheehan, John

Metal treatment

Stock

Magnetic

148442, 148303, 420581, H01F 1055

Patent

active

059481790

ABSTRACT:
An alloy used for the production of a rare-earth magnet alloy, particularly the boundary-phase alloy in the two-alloy method is provided to improve the crushability.
The Alloy consists of (a) from 35 to 60% of Nd, Dy and/or Pr, and the balance being Fe, or (b) from 35 to 60% of Nd, Dy and/or Pr, and at least one element selected from the group consisting of 35% by weight or less of Co, 4% by weight or less of Cu, 3% by weight or less of Al and 3% by weight or less of Ga, and the balance being Fe. The volume fraction of R.sub.2 Fe.sub.17 phase (Fe may be replaced with Cu, Co, Al or Ga) is 25% or more in the alloy and the average size of an R.sub.2 Fe.sub.17 phase is 20 .mu.m or less. The alloy can be produced by a centrifugal casting at an average accumulating rate of melt at 0.1 cm/second or less.

REFERENCES:
patent: 4289549 (1981-09-01), Kasai
patent: 4971637 (1990-11-01), Ohashi et al.
patent: 5011552 (1991-04-01), Otsuka et al.
patent: 5447578 (1995-09-01), Ozaki et al.
patent: 5482572 (1996-01-01), Eggert et al.
patent: 5647886 (1997-07-01), Kitazawa et al.

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