METAL MAGNETIC POWDER, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a metal magnetic powder capable of preventing aggregation among particles even if the particles are made small, and to provide a method for producing the metal magnetic powder.

SOLUTION: The method for producing the metal magnetic powder comprises: a metal magnetic powder producing stage where raw material powder admixed with nonmagnetic components for shape holding and sintering prevention is fired and is thereafter reduced, so as to produce metal magnetic powder essentially consisting of iron or iron and cobalt and comprising the nonmetallic components admixed for shape holding and sintering prevention; a solution treatment stage where the nonmagnetic components in the surface layer part of the metal magnetic powder are eluted away; an organic matter treatment stage where an organic matter is stuck to the surface of the metal magnetic powder after the nonmagnetic components in the surface layer part are eluted away; an oxidation treatment stage where an oxide film is formed on the surface of the metal magnetic powder to which the organic matter has been stuck; and a rereduction-stabilization treatment stage where the metal magnetic powder on which the oxide film has been formed is subjected to reduction treatment, and is thereafter subjected to oxidation treatment.

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