	US 12,119,151 B2
	Ferrite powder and method of producing the same
Koji Aga, Kashiwa (JP); Takashi Kojima, Kashiwa (JP); Takao Sugiura, Kashiwa (JP); Sho Kuwahara, Kashiwa (JP); Satomi Konno, Kashiwa (JP); and Tadashi Tsuduki, Kashiwa (JP)
Assigned to POWDERTECH CO., LTD., Kashiwa (JP)
Appl. No. 17/795,382
Filed by POWDERTECH CO., LTD., Kashiwa (JP)
PCT Filed Jan. 27, 2021, PCT No. PCT/JP2021/002835 § 371(c)(1), (2) Date Jul. 26, 2022, PCT Pub. No. WO2021/153612, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-010745 (JP), filed on Jan. 27, 2020.
Prior Publication US 2023/0085745 A1, Mar. 23, 2023
Int. Cl. H01F 1/34 (2006.01); C01G 49/00 (2006.01)

CPC H01F 1/344 (2013.01) [C01G 49/0072 (2013.01); C01P 2002/50 (2013.01); C01P 2004/32 (2013.01); C01P 2004/61 (2013.01); C01P 2006/40 (2013.01); C01P 2006/42 (2013.01); C01P 2006/80 (2013.01)]

10 Claims

1. A ferrite powder comprising highly spherical ferrite particles,

wherein the ferrite powder contains 55.0 to 70.0 mass % iron (Fe) and 3.5 to 18.5 mass % manganese (Mn), the ferrite powder containing more than 0.0 mass % to 7.5 mass % α-Fe₂O₃,

wherein the ferrite powder has a volume average particle size (D50) of 15.0 μm or less,

wherein the content of elements other than iron (Fe), manganese (Mn), and oxygen (O) in the ferrite powder is 0.5 mass % or less, and

wherein the ferrite powder has a carbon (C) content of from 0.001 mass % to 0.12 mass %.