Permanent magnet containing rare earth metal, boron and iron

Details Permanent magnet containing rare earth metal, boron and iron Permanent magnet containing rare earth metal, boron and iron

1995-07-27

1997-11-25

Sheehan, John

Metal treatment

Stock

Magnetic

148101, 148103, 419 12, 75244, H01F 1057

Patent

active

056907524

ABSTRACT:
A permanent magnet is obtained by pulverizing, molding and sintering a starting material containing an alloy ingot. The alloy ingot contains not less than 90% by volume of columnar crystals each having a columnar crystal grain size of 0.1 to 50 .mu.m along a short axis thereof and a columnar crystal grain size of larger than 100 .mu.m and not larger than 300 .mu.m along a long axis thereof, and is obtained by uniformly solidifying by a single roll method a molten alloy containing 25 to 31% by weight of a rare earth metal, 0.5 to 1.5% by weight of boron and iron under cooling conditions of a cooling rate of higher than 500.degree. C./sec. and not higher than 10,000.degree. C./sec. and a supercooling degree of 50.degree. to 500.degree. C.

REFERENCES:
patent: 4881986 (1989-11-01), Sato et al.
patent: 4898625 (1990-02-01), Otsuka et al.
patent: 4921551 (1990-05-01), Vernia
patent: 4966633 (1990-10-01), Brewer
patent: 5022939 (1991-06-01), Yajima et al.

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