Acicular iron-magnet pigments having an adjustable coercive fiel

Details Acicular iron-magnet pigments having an adjustable coercive fiel Acicular iron-magnet pigments having an adjustable coercive fiel

1992-05-18

1993-08-31

Rosenberg, Peter D.

Metal treatment

Stock

Magnetic

B22F 100

Patent

active

052405150

ABSTRACT:
Disclosed is a process for preparing acicular non-sintered iron metal pigments for magnetic signal recording, having a high storage density, high saturation magnetization and remanence, the coercive field strength of which at a given crystallite size of the starting material is low and is increased as desired by subsequent annealing. The preparation of said iron metal pigments is effected by reduction of iron oxide compounds with metal hydrides of metals of the Groups I or II of the Periodic Table of Elements in organic solvents, with the metal hydrides being solvatized with a carrier in the form of a carrier complex.

REFERENCES:
patent: 4447264 (1984-05-01), Suzuki
Fumio Watari, "Effect of Crystalline Properties on Coercive Force in Iron Acicular Fine Particles," Apr., 1988, pp. 1260-1264, in Journal of Materials Science 23.

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