Granted Patent B2

US 12,592,329 · App. 17/787,284 · Granted Mar 31, 2026

Inventors: Qin Lan (Fujian, CN); Jiaying Huang (Fujian, CN)

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

H01F1/0577C22C33/0278C22C38/002C22C38/005C22C38/06C22C38/12C22C38/14C22C38/16C22C2202/02

Abstract

Claims (77)

1 . An R-T-B-based permanent magnet material, which comprises R, B, M, Fe, Co, X and unavoidable impurities, wherein:

(1) R is rare earth element and comprises at least Nd and RH; RH is heavy rare earth element; the content of RH is 0.6-2.0 wt %;

M is at least one element selected from the group consisting of Ti, Zr and Nb;

X comprises (a) Cu and Ga, or (b) Cu, Al and Ga;

(2) in the R-T-B-based permanent magnet material, by mass percentage:

R: 30.5-32.0 wt %;

B: 0.95-0.99 wt %;

M: 0.3-0.6 wt %;

X: 0.8-1.8 wt %, and Cu: 0.35-0.50 wt %;

the balance being Fe, Co and unavoidable impurities;

wherein, the R-T-B-based permanent magnet material comprises R a M b X c T d phase, wherein, T is Fe and Co, 15 at %<a<25 at %, 2.8 at %<b<4.1 at %, 3.0 at %<c<6.0 at %, 68 at %<d<78 at %, and at % refers to atoms percentage in the R a M b X c T d phase.

2 . An electronic component in a motor comprising the R-T-B permanent magnet material according to claim 1 .

3 . The R-T-B permanent magnet material according to claim 1 , wherein, X comprises Cu, Al and Ga.

4 . The R-T-B permanent magnet material according to claim 3 , wherein, the content of Al is 0.3-0.8 wt %, the content of Ga is 0.2-0.5 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material.

5 . The R-T-B permanent magnet material according to claim 1 , wherein, R also comprises Pr.

6 . The R-T-B permanent magnet material according to claim 1 , wherein, the R-T-B-based permanent magnet material satisfies any one of the following conditions:

(1) the content of Cu is 0.4-0.5 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material;

(2) when X comprises Al, the content of Al is 0.3-0.8 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material;

(3) the content of Ga is 0.2-0.5 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material.

7 . The R-T-B permanent magnet material according to claim 1 , wherein, the R-T-B-based permanent magnet material satisfies any one of the following conditions:

(1) M is Ti;

(2) M is Zr;

(3) M is Nb;

(4) M is Ti and Zr.

8 . The R-T-B permanent magnet material according to claim 1 , wherein, when M comprises Ti, the content of Ti is 0.3-0.6 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material;

or, when M comprises Zr, the content of Zr is 0.3-0.6 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material;

or, when M comprises Nb, the content of Nb is 0.35-0.55 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material;

or, when M comprises Ti and Zr, the content of Ti is 0.2 wt % and the content of Zr is 0.3 wt %, and the percentage refers to mass percentage in the R-T-B-based permanent magnet material.

9 . The R-T-B permanent magnet material according to claim 1 , wherein,

M is any one element of Ti, Zr and Nb, provided that when M is Ti, the content of Ti is 0.3-0.6 wt %, when M is Zr, the content of Zr is 0.3-0.6 wt %, when M is Nb, the content of Nb is 0.35-0.55 wt %;

X comprises Cu, Al and Ga, the content of Al is 0.3-0.8 wt %, the content of Ga is 0.2-0.5 wt %; and

the content of Co is 0.8-2.0 wt %;

the percentage refers to mass percentage in the R-T-B-based permanent magnet material.

10 . The R-T-B permanent magnet material according to claim 1 , wherein, M is Ti, the content of Ti is 0.55-0.6 wt %.

11 . The R-T-B permanent magnet material according to claim 1 , wherein, RH is selected from the group consisting of Dy and Tb.

12 . The R-T-B permanent magnet material according to claim 1 , wherein, the content of RH is 0.7-2.0 wt %.

13 . A preparation method for the R-T-B-based permanent magnet material according to claim 1 , wherein, the preparation method comprises the following steps: the molten liquid of a raw material composition of the R-T-B-based permanent magnet material is subjected to

casting,

crushing,

pulverizing,

forming,

sintering and grain boundary diffusion treatment,

and the R-T-B-based permanent magnet material is obtained;

wherein the raw material composition of the R-T-B-based permanent magnet material comprises R, B, M, Fe, Co, X and unavoidable impurities, wherein:

(1) R is rare earth element, and R comprises at least Nd and RH; RH is heavy rare earth element; the content of RH is 0.6-2.0 wt %;

M is at least one element selected from the group consisting of Ti, Zr and Nb;

X comprises (a) Cu and Ga, or (b) Cu, Al and Ga;

(2) in the raw material composition of the R-T-B-based permanent magnet material, by mass percentage:

R: 30.5-32.0 wt %;

B: 0.95-0.99 wt %;

M: 0.3-0.6 wt %;

X: 0.8-1.8 wt %, and Cu: 0.35-0.50 wt %;

the balance being Fe, Co and unavoidable impurities.

14 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, the molten liquid of the raw material composition of the R-T-B-based permanent magnet material is prepared by the following method: smelting in a high-frequency vacuum induction smelting furnace;

and, the process of the casting is carried out according to the following steps: in an Ar gas atmosphere, cooling at a rate of 10 2 ° C./sec-10 4 ° C./sec;

and, the process of the crushing is carried out according to the following steps: hydrogen absorption, dehydrogenation and cooling treatment; the pulverizing is jet milling;

and, the process of the forming is a magnetic field forming method or a hot pressing and heat deforming method;

and, the process of the sintering is carried out according to the following steps: preheating, sintering and cooling in vacuum conditions;

and, the grain boundary diffusion treatment is carried out according to the following steps: a substance containing Tb or Dy is adhered to the surface of the R-T-B-based permanent magnet material by vaporizing, coating or sputtering, and diffusion heat treatment is carried out;

and, after the grain boundary diffusion treatment, a heat treatment is also carried out.

15 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, in the raw material composition of the R-T-B permanent magnet material, X comprises Cu, Al and Ga.

16 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, the raw material composition of the R-T-B permanent magnet material satisfies any one of the following conditions:

(1) R also comprises Pr;

(2) RH is selected from the group consisting of Dy and Tb.

17 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, in the raw material composition of the R-T-B permanent magnet material, RH is introduced during smelting and grain boundary diffusion;

wherein, the content of RH introduced during the smelting is 0.1-1.0 wt %; the content of RH introduced during the grain boundary diffusion is 0.1-1.0 wt %; and the percentage refers to mass percentage in the raw material composition of the R-T-B-based permanent magnet material.

18 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, the raw material composition of the R-T-B permanent magnet material satisfies any one of the following conditions:

(1) M is Ti;

(2) M is Zr;

(3) M is Nb;

(4) M is Ti and Zr.

19 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, in the raw material composition of the R-T-B permanent magnet material:

M is any one element of Ti, Zr and Nb, provided that when M is Ti, the content of Ti is 0.3-0.6 wt %, when M is Zr, the content of Zr is 0.3-0.6 wt %, when M is Nb, the content of Nb is 0.35-0.55 wt %;

X comprises Cu, Al and Ga, the content of Al is 0.3-0.8 wt %, the content of Ga is 0.2-0.5 wt %; and

the content of Co is 0.8-2.0 wt %;

the percentage refers to mass percentage in the raw material composition of the R-T-B-based permanent magnet material.

20 . The preparation method for the R-T-B-based permanent magnet material according to claim 13 , wherein, in the raw material composition of the R-T-B permanent magnet material, X comprises Cu, Al and Ga, the content of Al is 0.3-0.8 wt %, the content of Ga is 0.2-0.5 wt %; and the percentage refers to mass percentage in the raw material composition of the R-T-B-based permanent magnet material.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (14)