Acicular iron-magnet pigments having an adjustable coercive...

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

C - Chemistry, Metallurgy

21

B

148/5, 260/593,

C21B 15/00 (2006.01) C07F 5/02 (2006.01) G11B 5/706 (2006.01) H01F 1/06 (2006.01)

Patent

CA 2007408

ACICULAR IRON-MAGNET PIGMENTS HAVING AN ADJUSTABLE COERCIVE FIELD STRENGTH AND PROCESS FOR PRODUCING SAME Fe Metal Pigments for Magnetic Signal Recording Having an Adjustable Coercive Field Strength Abstract of the Disclosure Disclosed is a process for preparing acicular non-sintered iron metal pigments for magnetic signal recording, having a high storage density, high saturat- ion 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.

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