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.

公开(公告)号：US11915847B2

公开(公告)日：2024-02-27

申请号：US15915852

申请日：2018-03-08

Applicant: TDK CORPORATION

Inventor： Ryoma Nakazawa ,  Takeshi Takahashi

IPC: H01F1/26 ,  H01F41/02 ,  H01F27/255 ,  H01F1/24 ,  H01F3/08 ,  H01F1/33 ,  B22F1/10 ,  B22F1/16 ,  B22F1/052

CPC classification number: H01F1/26 ,  B22F1/10 ,  B22F1/16 ,  H01F1/24 ,  H01F1/33 ,  H01F3/08 ,  H01F27/255 ,  H01F41/0246 ,  B22F1/052 ,  B22F2304/054 ,  B22F2304/056 ,  B22F2304/10

Abstract: A dust core includes a metal magnetic material and a resin. Fine particles exist on a surface of the dust core.

公开(公告)号：US11043320B2

公开(公告)日：2021-06-22

申请号：US15915901

申请日：2018-03-08

Applicant: TDK CORPORATION

Inventor： Masahiro Kamiya ,  Yasuhide Yamashita ,  Chiomi Sato ,  Yousuke Futamata ,  Ryoma Nakazawa ,  Takeshi Takahashi ,  Hiroyuki Ono

IPC: H01F1/24 ,  H01F1/33 ,  H01F3/08 ,  B22F1/02 ,  H01F41/02 ,  C22C38/02 ,  H01F1/26

Abstract: A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.

公开(公告)号：US11996220B2

公开(公告)日：2024-05-28

申请号：US17879862

申请日：2022-08-03

Applicant: TDK CORPORATION

Inventor： Katsushi Yasuhara ,  Ryoma Nakazawa ,  Yusuke Taniguchi ,  Hiroyuki Ono

IPC: H01F1/147 ,  B22F1/052 ,  C22C38/02 ,  H01F1/20 ,  H01F3/08 ,  H01F5/00 ,  H01F27/255 ,  H01F27/28

CPC classification number: H01F1/14766 ,  B22F1/052 ,  C22C38/02 ,  H01F1/20 ,  H01F3/08 ,  H01F5/00 ,  H01F27/255 ,  H01F27/28 ,  C22C2202/02

Abstract: A soft magnetic alloy powder contains soft magnetic alloy particles. The soft magnetic alloy particles contain Fe and Si. The soft magnetic alloy particles each include crystal grains and crystal grain boundary between the crystal grains. At least one of the crystal grains has a Si segregation part.

公开(公告)号：US11545287B2

公开(公告)日：2023-01-03

申请号：US15694509

申请日：2017-09-01

Applicant: TDK CORPORATION

Inventor： Ryoma Nakazawa ,  Yousuke Futamata ,  Takeshi Takahashi

IPC: H01F1/24 ,  H01F3/08 ,  B22F9/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C45/02 ,  B29B7/90 ,  B29C43/00 ,  B22F1/16 ,  B29K105/16 ,  B29K505/00 ,  H01F41/02

Abstract: A dust core including a metal magnetic powder and a resin, in which the metal magnetic powder shows a particle diameter of more than 0 μm and 200 μm or less, a number percentage of 5.0% or more of metal magnetic particles among the metal magnetic particles composing the metal magnetic powder are at least partially surface-coated with an inorganic compound including an alkaline earth metal, in a coating part coating the metal magnetic particles, an amount of the alkaline earth metal is 10.0 mass % or more, when a total amount of a metal element included in the coating part is 100 mass %, is provide. The dust core is superior in a corrosion-resistance.

公开(公告)号：US11001933B2

公开(公告)日：2021-05-11

申请号：US15575587

申请日：2015-12-11

Applicant: TDK CORPORATION

Inventor： Ryoma Nakazawa ,  Kazuhiro Yoshidome

IPC: C25C7/02 ,  C22C29/12 ,  B22F5/00 ,  B22F7/02 ,  B22F7/06 ,  B32B15/20 ,  C22C29/00 ,  C22C1/04 ,  B32B15/04 ,  B32B18/00

Abstract: A composite body has a cermet member, a metal member and an intermediate member. The cermet member includes a cermet oxide phase and a cermet metal phase. The cermet oxide phase contains a Ni-containing oxide or an Fe-containing oxide. The cermet metal phase contains Ni. The intermediate layer contains Cu. The mass proportions of Cu in the cermet metal phase at points which are spaced apart by 10, 50, 100 and 1000 μm from the interface between the cermet member and the intermediate layer to the cermet member side are denoted by C10, C50, C100 and C1000 (mass %). When the mass proportions of Cu in the cermet oxide phase at points which are spaced apart by 10 and 100 μm from the interface to the cermet member side are denoted by M10 and M100 (mass %), C10>C50>C100>C1000, and 5>M10−M100>−5.