Process for producing ferromagnetic metal powder

Details Process for producing ferromagnetic metal powder Process for producing ferromagnetic metal powder

1985-02-27

1986-03-18

Stallard, Wayland

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, B22F 102, H01F 133

Patent

active

045766355

ABSTRACT:
A process for producing a ferromagnetic metal powder comprising treating acicular iron oxyhydroxide or an acicular metal oxyhydroxide composed mainly of iron with a silicon compound, dehydrating the treated material by heating the material in a non-reducing atmosphere to produce iron oxide particles or metal oxide particles composed mainly of iron, and reducing the resulting iron oxide particles or metal oxide particles composed mainly of iron by heating in a reducing atmosphere to produce iron powder or a metal powder composed mainly of iron, which is characterized in that the dehydration by heating in a non-reducing atmosphere is carried out at a temperature of from 300.degree. to 800.degree. C. and the iron oxide particles or the metal oxide particles composed mainly of iron are treated with a silicon compound prior to reduction by the heating in a reducing atmosphere.

REFERENCES:
patent: 4133677 (1979-01-01), Matsui et al.
patent: 4406694 (1983-09-01), Mishima et al.
patent: 4439231 (1984-03-01), Steck et al.
patent: 4456475 (1984-06-01), Hirai et al.
patent: 4514216 (1985-04-01), Mishima et al.

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