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    Iron powder, silicon oxide coated iron powder,, molded article for inductor, and inductor
    6.
    发明授权
    Iron powder, silicon oxide coated iron powder,, molded article for inductor, and inductor 有权

    公开(公告)号：US11247265B2

    公开(公告)日：2022-02-15

    申请号：US16316060

    申请日：2017-07-10

    Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.

    Inventor： Hidenori Yamaji ,  Masahiro Gotoh

    IPC: B22F1/00 ,  B22F1/02 ,  C01G49/06 ,  H01F1/20 ,  B22F9/22 ,  B22F3/00 ,  C22C38/00 ,  H01F1/24 ,  B22F9/04

    Abstract: An iron powder and method of making an iron powder. The method includes a step of neutralizing an acidic aqueous solution containing a trivalent iron ion and a phosphorus-containing ion, with an alkali aqueous solution, so as to provide a slurry of a precipitate of a hydrated oxide, or a step of adding a phosphorus-containing ion to a slurry containing a precipitate of a hydrated oxide obtained by neutralizing an acidic aqueous solution containing a trivalent iron ion with an alkali aqueous solution. A silane compound is added to the slurry so as to coat a hydrolysate of the silane compound on the precipitate of the hydrated oxide. The precipitate of the hydrated oxide after coating is recovered through solid-liquid separation, the recovered precipitate is heated to provide iron particles coated with a silicon oxide, and a part or the whole of the silicon oxide coating is dissolved and removed.

    MAGNETIC CORE AND COIL COMPONENT
    8.
    发明申请
    MAGNETIC CORE AND COIL COMPONENT 有权

    公开(公告)号：US20220037068A1

    公开(公告)日：2022-02-03

    申请号：US17502323

    申请日：2021-10-15

    Applicant: TDK CORPORATION

    Inventor： Kyohei TONOYAMA ,  Ken SATOH ,  Kentaro SAITO ,  Miyuki ASAI ,  Hitoshi OHKUBO

    IPC: H01F1/20 ,  B22F1/00 ,  B22F1/02 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  H01F1/24 ,  C22C38/08

    Abstract: A magnetic core includes a metal magnetic powder, which has a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder, the intermediate size powder, and the small size powder have an insulation coating. When A1 represents an average insulation coating thickness of the large size powder, A2 represents an average insulation coating thickness of the intermediate size powder, A3 represents an average insulation coating thickness of the small size powder, A3 is 30 nm or more and 100 nm or less, A3/A1≥1.3, and A3/A2≥1.0.

    Magnetic core and coil component
    10.
    发明授权
    Magnetic core and coil component 有权

    公开(公告)号：US11183320B2

    公开(公告)日：2021-11-23

    申请号：US16663514

    申请日：2019-10-25

    Applicant: TDK CORPORATION

    Inventor： Kyohei Tonoyama ,  Ken Satoh ,  Kentaro Saito ,  Miyuki Asai ,  Hitoshi Ohkubo

    IPC: H01F1/20 ,  B22F1/00 ,  B22F1/02 ,  H01F1/24 ,  C22C38/08 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12

    Abstract: A magnetic core includes a metal magnetic powder, which has a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder, the intermediate size powder, and the small size powder have an insulation coating. When A1 represents an average insulation coating thickness of the large size powder, A2 represents an average insulation coating thickness of the intermediate size powder, A3 represents an average insulation coating thickness of the small size powder, A3 is 30 nm or more and 100 nm or less, A3/A1≥1.3, and A3/A2≥1.0.

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