Ferromagnetic particles with stable magnetic characteristics and

Details Ferromagnetic particles with stable magnetic characteristics and Ferromagnetic particles with stable magnetic characteristics and

1985-08-30

1986-08-26

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148105, C23C 814

Patent

active

046080937

ABSTRACT:
Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.

REFERENCES:
patent: 4318735 (1982-03-01), Mishima
patent: 4456415 (1984-05-01), Hirai
patent: 4497654 (1985-02-01), Takano
patent: 4554089 (1985-11-01), Umemura

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