US 11,798,719 B2
Soft magnetic metal powder, dust core, and magnetic component
Kazuhiro Yoshidome, Tokyo (JP); Hiroyuki Matsumoto, Tokyo (JP); Kenji Horino, Tokyo (JP); Satoko Mori, Tokyo (JP); Takuma Nakano, Tokyo (JP); Seigo Tokoro, Tokyo (JP); Shota Otsuka, Tokyo (JP); Toru Ujiie, Tokyo (JP); and Kentaro Mori, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Mar. 8, 2019, as Appl. No. 16/296,348.
Claims priority of application No. 2018-043645 (JP), filed on Mar. 9, 2018.
Prior Publication US 2019/0279801 A1, Sep. 12, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. H01F 1/24 (2006.01); H01F 1/38 (2006.01); H01F 1/33 (2006.01); H01F 1/26 (2006.01); H01F 3/08 (2006.01); B22F 1/16 (2022.01); H01F 27/255 (2006.01); H01F 41/02 (2006.01); H01F 1/153 (2006.01)
CPC H01F 1/24 (2013.01) [B22F 1/16 (2022.01); H01F 1/26 (2013.01); H01F 1/33 (2013.01); H01F 1/38 (2013.01); H01F 3/08 (2013.01); B22F 2301/35 (2013.01); B22F 2304/10 (2013.01); H01F 1/15308 (2013.01); H01F 1/15333 (2013.01); H01F 27/255 (2013.01); H01F 41/0246 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A soft magnetic metal powder having coated particles, each comprising a soft magnetic metal particle including Fe, and a coating part,
wherein the soft magnetic metal particle is spherical,
the coating part is formed on a surface of the soft magnetic metal particle,
the coating part has a first coating part, a second coating part, and a third coating part in this order from the surface of the soft magnetic metal particle towards outside,
the first coating part includes an oxide of Si as a main component,
the second coating part includes an oxide of Fe as a main component,
the third coating part includes an oxide of at least one element selected from the group consisting of P, Si, Bi, and Zn,
a soft magnetic metal fine particle exists inside the third coating part, and
a thickness of the third coating part is 5 nm or more and 200 nm or less.