US 12,272,472 B2
Rare earth permanent magnet material, raw material composition, preparation method, application, and motor
Zongbo Liao, Fujian (CN); Ying Luo, Fujian (CN); Qin Lan, Fujian (CN); and Jiaying Huang, Fujian (CN)
Assigned to FUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd., Fujian (CN)
Appl. No. 17/600,103
Filed by FUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd., Fujian (CN)
PCT Filed Jul. 7, 2020, PCT No. PCT/CN2020/100591
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2021/042864, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 201910829486.2 (CN), filed on Sep. 3, 2019.
Prior Publication US 2022/0262550 A1, Aug. 18, 2022
Int. Cl. H01F 1/057 (2006.01); H01F 41/02 (2006.01)
CPC H01F 1/0577 (2013.01) [H01F 41/0266 (2013.01); H01F 41/0293 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A R-T-B based permanent magnet material, wherein, the R-T-B based permanent magnet material comprises the following components in mass percentage: R: 28.5-33.0 wt. %; RH: 1.5-4.5 wt. %; Cu: 0-0.08 wt. %, but not 0 wt. %; Co: 0.5-2.0 wt. %; Ga: 0.05-0.30 wt. %; B: 0.95-1.05 wt. %; and the remainder being Fe and unavoidable impurities; wherein: R is a rare earth element and comprises at least Nd and RH; and RH is a heavy rare earth element;
wherein, the R-T-B based permanent magnet material comprises R2T14B grains and grain boundary phase among R2T14B grains, the composition of the grain boundary phase is Rx—(B1-a-b-c—Gaa—Cub-Tc)y, wherein: T is Fe and Co, 2b<a<3.5b, 1/2c<a+b, 50 at %<x<65 at %, 35 at %<y<50 at %, and at % refers to the atomic percentage of each element in the grain boundary phase.