NEODYMIUM-IRON-BORON MAGNET MATERIAL, RAW MATERIAL COMPOSITION,PREPARATION METHOD THEREFOR AND USE THEREOF

1 . A raw material composition of neodymium-iron-boron magnet material, which comprises the following components by mass percentage:

29.5-32% of R′, wherein R′ refers to rare earth elements, R′ comprises Pr and Nd; wherein, Pr≥17.15%;

0.25-1.05% of Ga;

0.9-1.2% of B;

64-69% of Fe;

the percentage refers to the mass percentage of the content of each component in the total mass of the raw material composition of neodymium-iron-boron magnet material.

2 . The raw material composition according to claim 1 , wherein,

the content of Pr is 17.15-29%

or, the content of Ga is 0.25-1%.

3 . The raw material composition according to claim 1 , which comprises the following components by mass percentage: 29.5-32% of R′, R′ refers to rare earth elements, R′ comprises Pr and Nd; wherein, Pr≥17.15%; 0.25-1.05% of Ga; Cu≥0.35%; Al≤0.03%; 0.25-0.3% of Zr; 0.9-1.2% of B; 64-69% of Fe.

4 . The raw material composition according to claim 1 , which comprises the following components by mass percentage: 29.5-32% of R′, R′ refers to rare earth elements, R′ comprises Pr and Nd; wherein, Pr≥17.15%; 0.25-1.05% of Ga; Mn≤0.02%; 0.25-0.3% of Zr; 0.9-1.2% of B; 64-69% of Fe.

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

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.

6 . A neodymium-iron-boron magnet material, which is prepared by the preparation method according to claim 5 .

7 . A neodymium-iron-boron magnet material, which comprises the following components by mass percentage: 29.5-32% of R′, R′ comprises Pr and Nd; wherein, Pr≥17.15%;

0.245-1.05% of Ga;

0.9-1.2% of B;

64-69% of Fe;

the percentage refers to the mass percentage of the content of each component in the total mass of the neodymium-iron-boron magnet material.

8 . The neodymium-iron-boron magnet material according to claim 7 , wherein, the content of Pr is 17.15-29%

or, the content of Ga is 0.247-1.03%.

9 . A neodymium-iron-boron magnet material, wherein, in the intergranular triangle region of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Ga to the total mass of Nd and Ga≤1.0;

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

10 . A use of the neodymium-iron-boron magnet material according to claim 7 as an electronic component in a motor.

11 . The raw material composition according to claim 1 , wherein, the content of Nd is 1.85-14%;

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

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

or, the content of Fe is 65-68.3%;

or, R′ further comprises other rare earth elements other than Pr and Nd.

12 . The raw material composition according to claim 1 , wherein, R′ further comprises RH, RH refers to heavy rare earth elements; RH comprises one or more of Dy, Tb and Ho; the mass ratio of RH to R′ is <0.253; the content of RH is 1-2.5%.

13 . The raw material composition according to claim 12 , wherein,

when RH contains Tb, the content of Tb is 0.5%-2%;

or, when RH contains Dy, the content of Dy is 1% or less;

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

14 . The raw material composition according to claim 1 , wherein,

the raw material composition of neodymium-iron-boron magnet material further comprises Cu; the content of Cu is 0.1-0.8%;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Al; the content of Al is 1% or less;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Zr; the content of Zr is 0.4% or less;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Co; the content of Co is 0.5-2%;

or, the raw material composition of neodymium-iron-boron magnet material further comprises Mn; the content of Mn is 0.02% or less;

or, the raw material composition of neodymium-iron-boron magnet material further comprises one or more of Zn, Ag, In, Sn, V, Cr, Mo, Ta, Hf and W.

15 . The preparation method for neodymium-iron-boron magnet material according to claim 5 , wherein, after sintering and before the aging treatment, a grain boundary diffusion treatment is further carried out.

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

the content of Nd is 1.85-14%;

or, the ratio of the mass of Nd to the total mass of R′ is <0.5;

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

or, the content of Fe is 64.8-68.2%;

or, R′ further comprises other rare earth elements other than Pr and Nd.

17 . The neodymium-iron-boron magnet material according to claim 7 , wherein, R′ further comprises RH, RH refers to heavy rare earth elements, RH comprises one or more of Dy, Tb and Ho; the mass ratio of RH and R′ is <0.253; the content of RH is 1-2.5%.

18 . The neodymium-iron-boron magnet material according to claim 17 , wherein,

when RH comprises Tb, the content of Tb is 0.5-2.01%;

or, when RH comprises Dy, the content of Dy is 1.05% or less;

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

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

the neodymium-iron-boron magnet material further comprises Cu; the content of Cu is 0.1-0.9%;

or, the neodymium-iron-boron magnet material further comprises Al; the content of Al is 1.1 wt. % or less;

or, the neodymium-iron-boron magnet material further comprises Zr; the content of Zr is 0.4% or less;

or, the neodymium-iron-boron magnet material further comprises Co; the content of Co is 0.5-2%;

or, the neodymium-iron-boron magnet material further comprises Mn; the content of Mn is 0.02% or less;

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 one or more of Zn, Ag, In, Sn, V, Cr, Mo, Ta, Hf and W.

20 . The neodymium-iron-boron magnet material according to claim 7 , wherein, in the intergranular triangle region of the neodymium-iron-boron magnet material, the ratio of the total mass of Pr and Ga to the total mass of Nd and Ga≤1.0;

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