	US 12,119,150 B2
	Method for producing sintered magnet and sintered magnet
Nakheon Sung, Daejeon (KR); Ingyu Kim, Daejeon (KR); Soon Jae Kwon, Daejeon (KR); Jinhyeok Choe, Daejeon (KR); Hyounsoo Uh, Daejeon (KR); and Tae Hoon Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/288,661
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 24, 2020, PCT No. PCT/KR2020/012913 § 371(c)(1), (2) Date Apr. 26, 2021, PCT Pub. No. WO2021/060849, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0118839 (KR), filed on Sep. 26, 2019; and application No. 10-2020-0122724 (KR), filed on Sep. 23, 2020.
Prior Publication US 2021/0398718 A1, Dec. 23, 2021
Int. Cl. H01F 1/057 (2006.01); B22F 1/148 (2022.01); B22F 3/10 (2006.01); B22F 3/24 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/16 (2006.01); H01F 41/02 (2006.01); B22F 9/20 (2006.01)

CPC H01F 1/0577 (2013.01) [B22F 1/148 (2022.01); B22F 3/1003 (2013.01); B22F 3/24 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/06 (2013.01); C22C 38/16 (2013.01); H01F 41/0266 (2013.01); B22F 2003/248 (2013.01); B22F 9/20 (2013.01); B22F 2201/11 (2013.01); B22F 2301/355 (2013.01); C22C 2202/02 (2013.01)]

8 Claims

1. A method for producing a sintered magnet, comprising:

producing an R—Fe—B-based magnet powder by a reduction-diffusion method,

adding a R—Al—Cu powder as a sintering agent to the R—Fe—B-based magnet powder to form a mixed powder, wherein the R—Al—Cu powder is an alloy of R, Al and Cu, and R is Nd, Pr, Dy, Tb or Ce,

sintering the mixed powder to form a sintered magnet, and

forming the R—Al—Cu powder as the sintering agent,

wherein the forming the R—Al—Cu powder comprises:

mixing RH₂powder, Al powder, and Cu powder to form a sintered precursor,

agglomerating the sintered precursor,

raising a temperature of the agglomerated sintered precursor to form a metal alloy, and

pulverizing the metal alloy to form the sintering agent.