METHOD OF MANUFACTURING DUST CORE

摘要

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a dust core with which the dust core having relatively high electric resistivity and large magnetic permeability is obtained without performing press machining and a heat treatment simultaneously and therefore obtained at low cost while the consumption of soft magnetic metal particles each having an insulating oxide film is reduced. Ž<P>SOLUTION: The method is provided for manufacturing the dust core characterized in that the heat treatment is carried out after press-forming a magnetic material, which is obtained by mixing the soft magnetic metal particles having the insulating oxide films and soft metal particles having no insulating oxide film. The magnetic material is made at a ratio of the soft metal particles with the insulating oxide films to the soft magnetic metal particles with no insulating oxide film, which varies from the lowest mixing ratio to the lowest mixing ratio×1.1 such that when the soft metal particles with the insulating oxide films and the soft magnetic metal particles with no insulating oxide film are mixed uniformly, the soft magnetic metal particles with no insulating oxide film are surrounded with the soft metal particles with the insulating oxide films substantially not to come into contact with one another. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž