Metal treatment – Stock – Magnetic
Patent
1998-02-03
2000-04-04
Mai, Ngoclan
Metal treatment
Stock
Magnetic
148303, 148105, 252 6251, 75348, H01F 1055
Patent
active
060456299
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, 1% or less of B, and the balance being Fe, or (b) from 35 to 60% of Nd, Dy and/or Pr, 1% or less of B, 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 total volume fraction of R.sub.2 Fe.sub.17 and R.sub.2 Fe.sub.14 B phases (Fe may be replaced with Cu, Co, Al or Ga) is 25% or more in the alloy. The average size of each of the R.sub.2 Fe.sub.17 and R.sub.2 Fe.sub.14 B phases 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: 5387291 (1995-02-01), Kaneko et al.
patent: 5447578 (1995-09-01), Ozaki et al.
patent: 5647886 (1997-07-01), Kitazawa et al.
patent: 5948179 (1999-09-01), Hasegawa et al.
patent: 5963774 (1999-10-01), Sasaki et al.
Fujito Shinya
Hasegawa Hiroshi
Hirose Yoichi
Sasaki Shiro
Yajima Koichi
Mai Ngoclan
Showa Denko K.K.
TDK Corporation
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