Method for preparing ferromagnetic metal particles

Details Method for preparing ferromagnetic metal particles Method for preparing ferromagnetic metal particles

1983-11-01

1984-12-11

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, B22F 922

Patent

active

044876270

ABSTRACT:
A method for preparing ferromagnetic metal particles is disclosed. The method involves dehydrating oxyhydroxide particles comprised mainly of iron in a nonreducing gas under heating at a temperature of not more than 500.degree. C. to form oxide particles, providing silicon compounds on the surface of oxide particles, and reducing the oxide particles in a reducing gas under heating. The ferromagnetic metal particles provided have good acicular shape and a large specific surface area.

REFERENCES:
patent: 3598568 (1971-08-01), Klomp et al.
patent: 3607219 (1971-09-01), Vander Giessen et al.
patent: 3607220 (1971-09-01), Vander Giessen et al.
patent: 3634063 (1972-01-01), Hwang
patent: 3702270 (1972-11-01), Kawasaki et al.
patent: 4347291 (1982-08-01), Tokuoka
patent: 4406694 (1983-09-01), Mishima et al.

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