US 12,129,558 B2
Soft magnetic material and method for producing the same, and electric motor containing soft magnetic material
Matahiro Komuro, Tokyo (JP); Yuichi Satsu, Tokyo (JP); Hisamitsu Hatou, Tokyo (JP); and Seunghwan Park, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Appl. No. 17/414,357
Filed by Hitachi, Ltd., Tokyo (JP)
PCT Filed Sep. 11, 2019, PCT No. PCT/JP2019/035654
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/166115, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-023282 (JP), filed on Feb. 13, 2019.
Prior Publication US 2022/0042157 A1, Feb. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01F 1/147 (2006.01); C21D 1/06 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); C23C 8/22 (2006.01); H02K 1/02 (2006.01)
CPC C23C 8/22 (2013.01) [C21D 1/06 (2013.01); C22C 38/001 (2013.01); C22C 38/12 (2013.01); H01F 1/147 (2013.01); H02K 1/02 (2013.01); C21D 2211/008 (2013.01); C22C 2202/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A soft magnetic material that is sheet-shaped or foil-shaped, the soft magnetic material comprising:
iron, carbon, and nitrogen having an average carbon concentration of 0.45 mass % or more and 1.12 mass % or less, and an average nitrogen concentration of 0.4 mass % or more and 1.2 mass % or less; and
a martensite containing carbon and nitrogen, and γ-Fe,
wherein the phase structure of the martensite is 80 vol. % or more,
wherein the γ-Fe includes a face-centered cubic crystal containing nitrogen, and
wherein the soft magnetic material has a saturation magnetic flux density of 2.3 T or more and a thickness of 0.01 mm or more and 1.00 mm or less.