Process for preparing ferromagnetic particles comprising metalli

Details Process for preparing ferromagnetic particles comprising metalli Process for preparing ferromagnetic particles comprising metalli

1981-06-11

1983-06-28

Lewis, Michael L.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, 428403, 428404, 428405, B22F 100, A01F 102

Patent

active

043903614

ABSTRACT:
A process for preparing ferromagnetic iron particles comprising metallic iron as the major component by reduction of particles of an iron oxide under heating, characterized in that the iron oxide particles are provided with a first coating layer containing at least one metal compound chosen from compounds of aluminum, zinc and alkaline earth metals at the surfaces and a second coating layer containing at least one silicon compound thereon before the reduction, whereby the coated particles are prevented from sintering and breaking upon reduction so as to give ferromagnetic particles of metallic iron having excellent magnetic characteristics.

REFERENCES:
patent: 3520676 (1970-07-01), Stahr
patent: 3748119 (1973-07-01), Hwang et al.
patent: 3846118 (1974-11-01), Ehrreich et al.
patent: 4133677 (1979-01-01), Matsui et al.
patent: 4207092 (1980-06-01), Berry
patent: 4274865 (1981-06-01), Suzuki et al.
patent: 4290799 (1981-09-01), Schroeder et al.

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