Rare earth permanent magnet and a method for manufacture thereof

Details Rare earth permanent magnet and a method for manufacture thereof Rare earth permanent magnet and a method for manufacture thereof

1990-07-27

1991-10-15

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 419 29, 419 31, H01F 4102

Patent

active

050571656

ABSTRACT:
A rare earth permanent magnet of a composition, Ce(CO.sub.1-x-y-a Fe.sub.x Cu.sub.y M.sub.a).sub.z, where a, x, y, and z are: 0.005<1<0.10; 0.20<x<0.40; 0.10<y<0.30; 4.8<z<6.0; and M is zirconium, titanium, nickel, and/or manganese. A method for manufacturing the magnet is disclosed comprising the steps of: applying a first solid solution heat treatment to an alloy ingot having the above composition at temperatures from 900.degree. to 1100.degree. C. for 10 minutes to 100 hours; pulverizing the alloy ingot; obtaining a magnet body from this pulverized alloy by the powder metallurgy method; sintering the magnet body; applying a second solid solution heat treatment to the sintered magnet body at 900.degree.-100.degree. C. for 10 minutes to 100 hours; and applying aging heat treatment to the sintered magnet.

REFERENCES:
patent: 4322257 (1982-03-01), Menth et al.
patent: 4734131 (1988-03-01), Arai et al.

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