US 11,865,623 B2
Magnetic powder and method of preparing magnetic powder
Jinhyeok Choe, Daejeon (KR); Ikjin Choi, Daejeon (KR); Hyounsoo Uh, Daejeon (KR); and Soon Jae Kwon, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/761,309
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Aug. 6, 2019, PCT No. PCT/KR2019/009813
§ 371(c)(1), (2) Date May 4, 2020,
PCT Pub. No. WO2020/032547, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 10-2018-0093981 (KR), filed on Aug. 10, 2018; and application No. 10-2019-0092709 (KR), filed on Jul. 30, 2019.
Prior Publication US 2021/0151227 A1, May 20, 2021
Int. Cl. B22F 9/20 (2006.01); H01F 1/059 (2006.01); B22F 1/142 (2022.01); B22F 1/105 (2022.01)
CPC B22F 9/20 (2013.01) [B22F 1/105 (2022.01); B22F 1/142 (2022.01); H01F 1/0593 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A magnetic powder synthesized from reduction and diffusion of a mixture of a rare earth oxide, a raw material, a metal, a metal oxide and a reducing agent,
wherein the magnetic powder is single-phase with a reduced secondary phase present at a volume fraction greater than 0% and up to 2%,
wherein the secondary phase is Alpha Fe, FeTi, or Fe2Ti,
the mixture includes at least one of Cu, Al, or Ga,
the raw material comprises Fe and Co,
the metal comprises at least one of Ti, Zr, Mn, Mo, V or Si, and
the metal oxide comprises at least one of MnO2, MoO3, V2O5, SiO2, ZrO2 or TiO2, wherein the magnetic powder consists of a composition of R1-xZrx(Fe1-yCoy)12-zTzM, wherein R is Nd or Sm, M is Cu, Al or Ga, and T is Mn, Mo, V, Si or Ti, wherein R1-xZrx(Fe1-yCoy)12-zTzM has 0≤x≤0.2, 0≤y≤0.2, 0≤z≤1, wherein an average particle size of the particles constituting the magnetic powder is 10 micrometers or less.