Granted Patent B2

US 12,609,224 · App. 17/639,366 · Granted Apr 21, 2026

Inventors: Gang Fu (Fujian, CN); Jiaying Huang (Fujian, CN); Jixiang Huang (Fujian, CN); Qichen Quan (Fujian, CN)

Assignee: FUJIAN GOLDEN DRAGON RARE-EARTH Co., Ltd.

H01F1/0577C22C33/006C22C33/04C22C38/002C22C38/005C22C38/06C22C38/10C22C38/16C22C2202/02

Abstract

Claims (64)

1 . A neodymium-iron-boron magnet material, which comprises the following components by mass percentage: 29.4-32.8% of R′, R′ comprises Pr and Nd; wherein,

the content of Pr is 17.12-30%;

Al≥0.48%;

0.90-1.2% of B;

60-68% of Fe;

the percentage is the mass percentage relative to the total mass of the neodymium-iron-boron magnet material;

wherein, in the intergranular triangular region of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Al to the total mass of Nd and Al is ≤1.0;

at the grain boundary of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Al to the total mass of Nd and Al is ≥0.1.

2 . The neodymium-iron-boron magnet material according to claim 1 , wherein,

the content of Nd is 15% or less;

or, the content of Al is 0.48-3%;

or, the content of B is 0.95-1.2%;

or, the content of Fe is 59.9-67.7%.

3 . A neodymium-iron-boron magnet material, wherein, in the intergranular triangular region of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Al to the total mass of Nd and Al is ≤1.0;

at the grain boundary of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Al to the total mass of Nd and Al is ≥0.1.

4 . An electronic component in a motor comprising the neodymium-iron-boron magnet material according to claim 1 .

5 . The neodymium-iron-boron magnet material according to claim 1 , wherein, R′ further comprises RH, RH refers to heavy rare earth elements; RH comprises at least one selected from the group consisting of Dy, Tb and Ho; the mass ratio of RH to R′ is less than 0.253; the content of RH is 3% or less.

6 . The neodymium-iron-boron magnet material according to claim 5 , wherein,

when RH comprises Tb, the content of Tb is 0.5-2.1 wt. %;

or, when RH comprises Dy, the content of Dy is 0.51 wt. % or less;

or, when RH comprises Ho, the content of Ho is 0.8-2%.

7 . The neodymium-iron-boron magnet material according to claim 1 , wherein,

the neodymium-iron-boron magnet material further comprises Cu; the content of Cu is 1.2% or less;

or, the neodymium-iron-boron magnet material further comprises Ga; the content of Ga is 0.42% or less;

or, the neodymium-iron-boron magnet material further comprises X, and X comprises Zr, Nb, Hf or Ti;

or, the neodymium-iron-boron magnet material further comprises Co; the content of Co is 0.5-3.5%;

or, the neodymium-iron-boron magnet material further comprises O, the content of O is 0.13% or less;

or, the neodymium-iron-boron magnet material further comprises at least one selected from the group consisting of Zn, Ag, In, Sn, V, Cr, Mo, Ta and W.

8 . A preparation method for the neodymium-iron-boron magnet material according to claim 1 , which employs a raw material composition;

the preparation method comprises the following steps: subjecting the molten liquid of the raw material composition to

melting and casting,

hydrogen decrepitation,

forming,

sintering, and

aging treatment;

the raw material composition comprises the following components by mass percentage:

29.5-32.8% of R′, R′ comprises Pr and Nd; wherein, the content of Pr is 17.15-30%;

Al≥0.5%;

0.90-1.2% of B;

60-68% of Fe;

the percentage is the mass percentage relative to the total mass of the raw material composition of neodymium-iron-boron magnet material.

9 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein,

the ratio of Nd to the total mass of R′ is less than 0.5;

or, the content of Nd is 15% or less;

or, the content of Al is 0.5-3 wt. %;

or, the content of B is 0.95-1.2%;

or, the content of Fe is 60-67.515%.

10 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein, the raw material composition further comprises the following components by mass percentage: Cu≤1.2%; 0.25-0.3% of Zr.

11 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein, the raw material composition further comprises the following components by mass percentage: Ga≤0.42%; Cu≤1.2%; 0.25-0.3% of Zr.

12 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein, R′ further comprises RH, RH refers to heavy rare earth elements, RH comprises at least one selected from the group consisting of Dy, Tb and Ho; the mass ratio of RH to R′ is less than 0.253; the content of RH is 0.5-2.7%.

13 . The preparation method for the neodymium-iron-boron magnet material according to claim 12 , wherein,

when RH comprises Tb, the content of Tb is 0.5-2 wt. %;

or, when RH comprises Dy, the content of Dy is 0.5 wt. % or less;

or, when RH comprises Ho, the content of Ho is 0.8-2%.

14 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein,

the raw material composition of neodymium-iron-boron magnet material further comprises Cu; the content of Cu is 0.1-1.2%;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Ga; the content of Ga is 0.45 wt. % or less;

or, the raw material composition of neodymium-iron-boron magnet material further comprises X; X comprises Zr, Nb, Hf or Ti;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Co; the content of Co is 0.5-3%;

or, the raw material composition of neodymium-iron-boron magnet material further comprises O; the content of O is 0.13% or less;

or, the raw material composition of neodymium-iron-boron magnet material further comprises at least one selected from the group consisting of Zn, Ag, In, Sn, V, Cr, Mo, Ta and W.

15 . The preparation method for the neodymium-iron-boron magnet material according to claim 10 , wherein, the content of Al is 0.5-3%; the content of Cu is 0.35-1.2%; R′ further comprises RH, RH refers to heavy rare earth elements, and the content of RH is 1-2.5%.

16 . The preparation method for the neodymium-iron-boron magnet material according to claim 11 , wherein, the content of Al is 0.5-3%; the content of Cu is 0.35-1.2%; R′ further comprises RH, RH refers to heavy rare earth elements, and the content of RH is 1-2.5%.

17 . The preparation method for the neodymium-iron-boron magnet material according to claim 8 , wherein, after sintering and before the aging treatment, a grain boundary diffusion treatment is further carried out.

Assignments (6)

Priority Claims (1)

Continuity (1)

References Cited (13)