POWDER FOR DUST CORE, DUST CORE FORMED BY COMPACTING POWDER FOR DUST CORE, AND METHOD OF PRODUCING POWDER FOR DUST CORE

摘要

PROBLEM TO BE SOLVED: To provide powder for a dust core high in resistivity and formed by compacting the powder for the dust core, and a method of producing the powder for the dust core.;SOLUTION: In the powder 1 for the dust core having a silicon-concentrated silicon permeation layer 3 formed in a surface layer of soft magnetic metal powder 2, silicon dioxide powder 8 is diffused and bonded to a surface of the silicon permeation layer 3 in a state that a part of the silicon dioxide powder permeates the silicon permeation layer 3 to be diffused and the rest projects from a surface of the silicon permeation layer 3, and the silicon dioxide powder is consequently formed into a diffusion bonding body 4, and the diffusion bonding body 4 forms a gap S between the diffusion bonding body and the other powder 1 for the dust core during the powder compacting, thereby resistivity is increased.;COPYRIGHT: (C)2011,JPO&INPIT