METHOD FOR MANUFACTURING INSULATING SOFT MAGNETIC METAL POWDER MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing an insulating soft magnetic metal powder molding having a small core loss and a large permeability.

SOLUTION: The method for obtaining an insulating soft magnetic metal powder molding by forming an organic insulating film on the surface of soft magnetic metal powder, compressing, molding and then heat-treating the powder includes the steps of magnetically annealing the compressed and molded powder in a nonoxidizing atmosphere such as a vacuum or an inert gas, at a high temperature not lower than the Curie temperature of the soft magnetic metal and not higher than such a temperature that the insulating film is not destroyed; and after the annealing step, heat treating the powder in an oxidizing atmosphere such as the atmosphere at a temperature not lower than 400°C not higher than 700°C.

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