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

1990-01-12

1991-10-01

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75343, C21C 1500, B22F 900

Patent

active

050530755

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: 3532490 (1970-10-01), Burkin
patent: 3623859 (1971-11-01), Aldridge
patent: 4378240 (1983-03-01), Siegle

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