R-T-B SERIES PERMANENT MAGNET MATERIAL, RAW MATERIAL COMPOSITION, PREPARATION METHOD AND APPLICATION

1 . R-T-B series permanent magnet material I, wherein R-T-B series permanent magnet material I comprises R, T and X;

R is a rare earth element including at least Nd, and R includes RH, wherein RH is a heavy rare earth element, and RH includes at least one or more of Dy and Tb;

T includes at least Fe;

X is one or more of Al, Ga and Cu, and X necessarily includes Al;

R-T-B series permanent magnet material I satisfies the following relational expressions:

(1) an atomic ratio of (Fe+Co)/B of 12.5-13.5;

(2) an atomic ratio of B/X of 2.7-4.1;

R-T-B series permanent magnet material I comprises R 2 T 14 B main phase crystalline grains, a two-grain boundary phase between two adjacent R 2 T 14 B main phase crystalline grains, and a rare-earth-rich phase, wherein the two-grain boundary phase and the rare-earth-rich phase comprise a phase composed of R 6 T 13 X.

2 . R-T-B series permanent magnet material I according to claim 1 , wherein R-T-B series permanent magnet material I comprises, by mass percentage,

31.0-32.5 wt. % of R, and R includes RH,

0.20-0.50 wt. % of Cu,

0.40-0.80 wt. % of Al,

0-0.30 wt. % of Ga,

0.10-0.25 wt. % of Nb,

0.5-2.0 wt. % of Co,

0.97-1.03 wt. % of B,

wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

R is a rare earth element including at least Nd, RH is a heavy rare earth element, and RH includes at least one or more of Dy and Tb.

3 . R-T-B series permanent magnet material II, wherein R-T-B series permanent magnet material II comprises R, T and X;

R is a rare earth element including at least Nd, and R includes RH, wherein RH is a heavy rare earth element;

RH includes at least one or more of Dy and Tb;

T includes at least Fe;

X is one or more of Al, Ga and Cu, and X necessarily includes Al;

R-T-B series permanent magnet material II satisfies the following relational expressions:

(1) au atomic ratio of (Fe+Co)/B of 12.5-13.7;

(2) an atomic ratio of B/X of 2.8-4.0.

4 . R-T-B series permanent magnet material II according to claim 3 , wherein R-T-B series permanent magnet material II comprises, by mass percentage, the following components:

30.5-32 wt. % of R, and R includes RH,

0.20-0.50 wt. % of Cu,

0.40-0.80 wt. % of Al,

0-0.30 wt. % of Ga,

0.10-0.25 wt. % of Nb,

0.5-2.0 wt. % of Co, and

0.97-1.03 wt. % of B,

wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

R is a rare earth element including at least Nd;

RH is a heavy rare earth element, and RH includes at least one or more of Dy and Tb;

the balance is Fe and inevitable impurities.

5 . A raw material composition for R-T-B series permanent magnet material II, comprising, by mass percentage, the following components:

30.5-32 wt. % of R, and R includes RH,

0.20-0.50 wt. % of Cu,

0.40-0.80 wt. % of Al,

0-0.30 wt.% of Ga,

0.10-0.25 wt. % of Nb,

0.5-2.0 wt. % of Co, and

0.97-1.03 wt. % of B,

wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

R is a rare earth element including at least Nd;

RH is a heavy rare earth element, and RH includes at least one or more of Dy and Tb;

the balance is Fe and inevitable impurities.

6 . A preparation method for R-T-B series permanent magnet material II, comprising the following step: subjecting a melt of the raw material composition for R-T-B series permanent magnet material II according to claim 5 to casting, crushing, pulverization forming, and sintering.

7 . R-T-B series permanent magnet material II prepared by the preparation method according to claim 6 .

8 . A preparation method for R-T-B series permanent magnet material I, comprising subjecting the R-T-B series per lar ent magnet material II according to claim 3 to a grain boundary diffusion treatment.

9 . R-T-B series permanent magnet material I prepared by the preparation method according to claim 8 .

10 . An application of n R-T-B series permanent magnet material as an electronic component, wherein

the R-T-B series permanent magnet material is R-T-B series permanent magnet material according to claim 1 .

11 . The R-T-B series permanent magnet material I according to claim 1 , wherein, T includes Fe and Co;

or, the atomic ratio of (Fe+Co)/B is 12.8-13.39;

or, the atomic ratio of B/X is 2.8-4.

12 . The R-T-B series permanent magnet material I according to claim 1 , wherein, in the R 6 -T 13 -X phase, X is Al and Cu.

13 . The R-T-B series permanent magnet material I according to claim 2 , wherein, R further includes the element Pr;

or, the range of the content of R is 31.5-32.5 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of RH is 0.8-2.2 wt.%, wherein wt.% refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of Nb is 0.1-0.2 wt. % or 0.12-0.25 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of Co is 0.5-1.5 wt. % or 1-2 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of B is 0.97-1 wt. % or 0.99-1.03 wt. %, wherein wt.% refers to the mass percentage relative to R-T-B series permanent magnet material I.

14 . The R-T-B series permanent magnet material I according to claim 2 , wherein, the range of the content of Cu is 0.2-0.4 wt. % or 0.3-0.5 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of Al is 0.4-0.6 wt. % or 0.5-0.8 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I;

or, the range of the content of Ga is 0 wt. % or (13 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material I.

15 . R-T-B series permanent magnet material II according to claim 3 , wherein, T includes Fe and Co;

or, the atomic ratio of (Fe+Co)/B is 12.9-13;

or, the atomic ratio of B/X is 2.9-3.9.

16 . R-T-B series permanent magnet material II according to claim 4 , wherein, R further includes the element Pr;

or, the range of the content of R is 31-32 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of RH is 0.3-1.7 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of Nb is 0.1-0.2 wt. % or 0.12-0.25%, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of Co is 0.5-1.5 wt.% or 1-2 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of B is 0.97-1 wt. % or 0.99-1.03 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II.

17 . R-T-B series permanent magnet material II according to claim 4 , wherein, the range of the content of Cu is 0.2-0.4 wt. % or 0.3-0.5 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of Al is 0.4-0.6 wt. % or 0.5-0.8 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II;

or, the range of the content of Ga is 0 wt. % or 0.3 wt. %, wherein wt. % refers to the mass percentage relative to R-T-B series permanent magnet material II.

18 . The raw material composition for R-T-B series permanent magnet material II according to claim 5 , wherein, the range of the content of R is 31-32 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of RH is 0.3-1.7 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of Nb is 0.1-112 wt. % or 0.12-0.25 wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of Co is 0.5-1.5 wt. % or 1-2 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of B is 0.97-1 wt. % or 0.99-1.03 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II.

19 . The raw material composition for R-T-B series permanent magnet material II according to claim 5 , wherein, the range of the content of Cu is 0.2-0.4 wt. % or 0.3-0.5 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of Al is 0.4-0.6 wt. % or 0.5-0.8 wt.%, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II;

or, the range of the content of Ga is 0 wt. % or 0.3 wt. %, wherein wt. % refers to the mass percentage relative to the raw material composition for R-T-B series permanent magnet material II.

20 . An application of an R-T-B series permanent magnet material as an electronic component, wherein, the R-T-B series permanent magnet material is R-T-B series permanent magnet material II according to claim 3 .