Process for producing rare earth-cobalt permanent magnet

Details Process for producing rare earth-cobalt permanent magnet Process for producing rare earth-cobalt permanent magnet

1988-02-02

1989-10-24

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148102, 148104, 419 25, 419 29, H01F 102

Patent

active

048759465

ABSTRACT:
A heat-treatment process for producing rare earth-cobalt permanent magnets having relatively high and reproducible magnetic properties wherein one or more controlled cooling rates are applied in temperatures ranging from a sintering temperature and the isothermal annealing temperature. The controlled cooling rates are preferably divided into two steps. In the first step, the cooling rate is preferably greater than 10.degree. C./min. In the second step, the cooling rate is preferably less than 10.degree. C./min. and is ideally in the range of 2.degree.-4.degree. C./min. By the heat-treatment process of this invention, a permanent magnet having a high intrinsic coercivity of more than 20 kOe, a maximum energy product of greater than 19 MGOe, and a coercivity of greater than 8.1 kOe can be reproducibly obtained.

REFERENCES:
patent: 3982971 (1976-09-01), Yamanaka et al.
patent: 4221613 (1980-09-01), Imaizumi et al.

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