公开(公告)号：US10811176B2

公开(公告)日：2020-10-20

申请号：US15913964

申请日：2018-03-07

Applicant: TDK CORPORATION

Inventor： Yousuke Futamata ,  Ryoma Nakazawa ,  Takeshi Takahashi ,  Junichi Shimamura

IPC: H01F27/28 ,  H01F1/147 ,  H01F3/00 ,  H01F1/26 ,  H01F3/08 ,  H01F1/33 ,  H01F1/24

Abstract: A dust core includes a metal magnetic material, a resin, an insulation film, and an intermediate layer. The insulation film covers the metal magnetic material. The intermediate layer exists between the insulation film and the metal magnetic material and contacts therebetween. The metal magnetic material includes 85 to 99.5 wt % of Fe, 0.5 to 10 wt % of Si, and 0 to 5 wt % of other elements, with respect to 100 wt % of the entire metal magnetic material. The intermediate layer includes a Fe—Si—O based oxide. The insulation film includes a Si—O based oxide.