US 12,226,830 B2
Composite magnetic material, electrical and electronic device, and method of manufacturing composite magnetic material
Tetsuo Ito, Sendai (JP); and Masakazu Abe, Sendai (JP)
Assigned to TOKIN CORPORATION, Miyagi (JP)
Filed by TOKIN CORPORATION, Shiroishi (JP)
Filed on Jun. 1, 2020, as Appl. No. 16/888,888.
Claims priority of application No. 2019-105184 (JP), filed on Jun. 5, 2019.
Prior Publication US 2020/0384531 A1, Dec. 10, 2020
Int. Cl. B22F 1/00 (2022.01); B22F 1/05 (2022.01); B22F 1/065 (2022.01); B22F 1/102 (2022.01); B22F 5/00 (2006.01); H01F 1/16 (2006.01); H01F 41/02 (2006.01)
CPC B22F 5/006 (2013.01) [B22F 1/05 (2022.01); B22F 1/065 (2022.01); B22F 1/102 (2022.01); H01F 1/16 (2013.01); H01F 41/0233 (2013.01); B22F 2304/10 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A composite magnetic material, comprising:
spherical soft magnetic metal powder incorporated in the composite magnetic material in a dispersed manner;
a flame retardant powder incorporated in the composite magnetic material in a dispersed manner; and
a binder configured to bind the soft magnetic metal powder and the flame retardant,
wherein the composite magnetic material has a sheet shape,
wherein the composite magnetic material has a volume occupancy of the soft magnetic metal powder of 45 vol % or more and 68 vol % or less, and a volume occupancy of the flame retardant of 12 vol % or more and 20 vol % or less,
wherein the composite magnetic material has a thickness of at least 0.38 mm and not more than 1 mm,
wherein the flame retardant powder has a spherical shape with an average particle diameter of 2 μm or more, and
wherein the flame retardant is a nitrogen-based compound.