METHOD OF MANUFACTURING MAGNETITE-COATED COATING IRON POWDER

摘要

PROBLEM TO BE SOLVED: To provide a method of coating magnetite to the surface of an iron powder capable of obtaining an iron powder coated with magnetite with easy control for the film thickness and at a uniform thickness. SOLUTION: The method of coating the magnetite to the surface of the iron powder includes: a step of putting the iron powder into a reaction liquid containing iron pentacarbonyl and heating the same in an oxidizing atmosphere; a step of heating the reaction liquid containing the iron pentacarbonyl in a reducing atmosphere thereby precipitating the iron particles; and a step of heating the reaction liquid in which the iron particles are precipitated in the oxidizing atmosphere and coating the magnetite to the precipitated iron particles. COPYRIGHT: (C)2009,JPO&INPIT