Granted Patent B2

US 12,198,840 · App. 17/600,102 · Granted Jan 14, 2025

Inventors: Qin Lan (Fujian, CN); Jiaying Huang (Fujian, CN); Zhixing Xie (Fujian, CN); Weiguo Mou (Fujian, CN); Qingfang Huang (Fujian, CN)

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

H01F1/0577B22F9/04C22C33/0278C22C38/005C22C38/10C22C38/14C22C38/16H01F41/0253B22F2009/044B22F2301/355C22C2202/02

Abstract

Claims (49)

1. An R-T-B based permanent magnet material, wherein, the R-T-B based permanent magnet material comprises the following components in percentage by mass:

29.0-32.0 wt. % of R, wherein R comprises RH, and the content of RH is greater than 1 wt. %;

0.30-0.50 wt. % of Cu, not including 0.50 wt. %;

0.10-1.0 wt. % of Co;

0.05-0.20 wt. % of Ti;

0.92-0.98 wt. % of B;

and the remainder being Fe and unavoidable impurities; wherein:

R is a rare-earth element, and R at least comprises Nd;

RH is a heavy rare-earth element, and RH at least comprises Tb;

wherein, the R-T-B based permanent magnet material has a high-Cu-high-Ti phase with composition ratio of (T 1-a-b -Ti a —Cu b )—R y at grain boundary of the magnet; wherein: T represents Fe and Co, 1.5b<a<2b, 70 at %<x<82 at %, 18 at %<y<30 at %, a is in the range of 2.50-3 at %, at % refers to the percentage of the atomic content of each element in the R-T-B based permanent magnet material.

2. The R-T-B based permanent magnet material according to claim 1 , wherein, the content of Cu is 0.30-0.45 wt. %.

3. The R-T-B based permanent magnet material according to claim 1 , wherein, the content of Ti is 0.05 wt. % or 0.10-0.20 wt. %, and wt. % refers to the mass percentage in the R-T-B based permanent magnet material.

4. The R-T-B based permanent magnet material according to claim 1 , wherein, RH further comprises Dy.

5. The R-T-B based permanent magnet material according to claim 1 , wherein, the content of Co is 0.10 wt. % or 0.50-1.0 wt. %, and wt. % refers to the mass percentage in the R-T-B based permanent magnet material;

or, the content of B is 0.92-0.96 wt. % or 0.94-0.98 wt. %, and wt. % refers to the mass percentage in the R-T-B based permanent magnet material.

6. The R-T-B based permanent magnet material according to claim 1 ,

wherein, the content of R is 29.5-32.0 wt. %;

or, the content of RH is 1.05-1.30 wt. %.

7. The R-T-B based permanent magnet material according to claim 1 ,

wherein, the R-T-B based permanent magnet material comprises the following components:

29.5-32.0 wt. % of R, and the content of RH is 1.05-1.3 wt. %;

0.30-0.45 wt. % of Cu;

0.50-1.0 wt. % of Co;

0.10-0.20 wt. % of Ti;

0.92-0.96 wt. % of B;

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

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

9. A preparation method for the R-T-B based permanent magnet material according to claim 1 , wherein, the preparation method for the R-T-B based permanent magnet material 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, decrepitation, pulverization, forming, sintering, and grain boundary diffusion treatment, and the R-T-B based permanent magnet material is obtained; wherein: the heavy rare-earth elements in the grain boundary diffusion treatment comprise Tb;

wherein, the raw material composition of the R-T-B based permanent magnet material comprises the following components in percentage by mass:

29.0-31.5 wt. % of R, and R comprises RH, and the content of RH is 0.1-0.9 wt. %;

0.30-0.50 wt. % of Cu, not including 0.50 wt. %;

0.10-1.0 wt. % of Co;

0.05-0.20 wt. % of Ti;

0.92-0.98 wt. % of B;

and the remainder being Fe and unavoidable impurities; wherein:

R is a rare-earth element, and R at least comprises Nd;

RH is a heavy rare-earth element.

10. The preparation method for the R-T-B based permanent magnet material according to claim 9 , wherein, the molten liquid of the raw material composition of the R-T-B based permanent magnet material is prepared as follows: melting in a high-frequency vacuum induction melting furnace;

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

or, the process of the decrepitation is carried out as the following steps: being subjected to hydrogen absorption, dehydrogenation and cooling treatment;

or, the method of the forming is a magnetic field forming method or a hot pressing and hot deformation method;

or, the process of the sintering is carried out as the following steps: preheating, sintering, and cooling under vacuum conditions;

or, the grain boundary diffusion treatment is carried out as the following steps: substance containing Tb is attached to the surface of the R-T-B based permanent magnet material by evaporating, coating or sputtering, and then diffusion heat treatment is carried out; the substance containing Tb is Tb metal, a compound or an alloy containing Tb;

or, after the grain boundary diffusion treatment, heat treatment is further performed.

11. The preparation method for the R-T-B based permanent magnet material according to claim 10 , wherein, the vacuum degree of the melting furnace is 5×10 −2 Pa; and the temperature of the melting is 1500° C. or less;

or, the hydrogen absorption is carried out under the condition of a hydrogen pressure of 0.15 MPa; the pulverization is a jet mill pulverization, the pressure in the pulverizing chamber of the jet mill pulverization is 0.38 MPa, and the time for the jet mill pulverization is 3 hours;

or, the temperature of preheating is 300-600° C., and the time of preheating is 1-2 h; the temperature of sintering is 900° C.-1100° C., and the time of sintering is 2 h;

or, the temperature of the diffusion heat treatment is 800-900° C., and the time of the diffusion heat treatment is 12-48 h;

or, the temperature of the heat treatment is 450-550° C., and the time of the heat treatment is 3 h.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (17)