阅读说明：本技术 一种r-t-b系磁性材料及其制备方法 (R-T-B magnetic material and preparation method thereof ) 是由 付刚 黄佳莹 黄清芳 许德钦 于 2020-06-28 设计创作，主要内容包括：本发明公开了一种R-T-B系磁性材料,其特征在于,以重量百分比计,其包含下述组分：29.50wt.％～33.28wt.％的R；所述的R为稀土元素,其包含Pr和R<Sup>H</Sup>；所述的Pr≥15.00wt.％；所述的R<Sup>H</Sup>包含Tb和/或Dy；0.24wt.％～0.80wt.％的Cu；0.31wt.％～0.75wt.％的Zr；0wt.％～1.52wt.％的Al；0.90wt.％～1.03wt.％的B；和,0.05wt.％～1.50wt.％的Ga。该磁性材料具有较佳的剩磁、矫顽力、温度系数等。(The invention discloses an R-T-B magnetic material, which is characterized by comprising the following components in percentage by weight: 29.50 wt.% to 33.28 wt.% R; r is rare earth element and contains Pr and R H (ii) a The Pr is more than or equal to 15.00 wt.%; said R H Containing Tb and/or Dy; 0.24 wt.% to 0.80 wt.% Cu; 0.31 wt.% to 0.75 wt.% Zr; 0 wt.% to 1.52 wt.% Al; 0.90 wt.% to 1.03 wt.% of B; and, 0.05 wt.% to 1.50 wt.% Ga. The magnetic material has better remanence, coercive force, temperature coefficient and the like.)

1. An R-T-B magnetic material is characterized by comprising the following components in percentage by weight:

29.50 wt.% to 33.28 wt.% R; r is rare earth element and contains Pr and R^H(ii) a The Pr is more than or equal to 15.00 wt.%; said R^HContaining Tb and/or Dy;

0.24 wt.% to 0.80 wt.% Cu;

0.31 wt.% to 0.75 wt.% Zr;

0 wt.% to 1.52 wt.% Al;

0.90 wt.% to 1.03 wt.% of B;

and, 0.05 wt.% to 1.50 wt.% Ga.

2. The R-T-B based magnetic material according to claim 1, wherein the content of R is 30.94 wt.% to 33.00 wt.%;

and/or, said R further comprises Nd;

and/or, the content of Pr is 15.07 wt.% to 19.79 wt.%;

and/or, said R^HIs 0.77 wt.% to 2.80 wt.%;

and/or, said R^HThe mass ratio of the mass of (A) to the mass of R is 0.023-0.085;

and/or, said R^HTb and/or Dy;

and/or, when said R is^HWhen Tb is contained, the content of Tb is 0.45 wt.% to 1.50 wt.%;

and/or, when said R is^HWhen Dy is contained, the content of Dy is 0.51-1.30 wt%;

and/or the content of Cu is 0.35-0.50 wt.%;

and/or, the Zr content is 0.39 wt.% to 0.57 wt.%;

and/or the content of Al is 0.47-0.80 wt.%;

and/or, the content of B is 0.93 wt.% to 0.98 wt.%;

and/or the Ga content is 0.25 wt.% to 0.80 wt.%;

and/or, said T comprises Fe;

and/or, the R-T-B magnetic material is prepared according to a first method, wherein the first method comprises the following steps: the raw materials are subjected to smelting, casting, powder making, molding, sintering and heat treatment to obtain the R-T-B magnetic material.

3. The R-T-B based magnetic material according to claim 2, wherein the content of R is 32.79 wt.%;

and/or, when said R further comprises Nd, said R is selected from Nd, Pr and R^HComposition is carried out;

and/or, when said R further comprises Nd, said Nd is present in an amount of 10.20 wt.% to 14.30 wt.%;

and/or, the content of Pr is 16.79 wt.% to 19.50 wt.%;

and/or, said R^HIs 0.95 wt.% to 2.20 wt.%;

and/or, said R^HThe mass ratio of the (A) to the R is 0.031-0.066;

and/or, when said R is^HWhen Tb is contained, the content of Tb is 0.77 wt.% to 1.20 wt.%;

and/or, when said R is^HWhen Dy is contained, the content of Dy is 0.98 wt.%;

and/or, the Cu content is 0.39 wt.%;

and/or, said Zr content is 0.49 wt.%;

and/or, said Al content is 0.72 wt.%;

and/or, said B content is 0.95 wt.%;

and/or, the Ga content is 0.45 wt.%;

and/or, when said T comprises Fe, said Fe is present in an amount of 62.92 wt.% to 67.51 wt.%;

and/or said R-T-B based magnetic material is composed of said R, said Cu, said Zr, said Al, said B, said Ga, and said Fe;

and/or the smelting temperature is 1400-1500 ℃;

and/or the pressure of the smelting is 5 × 10^-2Pa；

And/or, said casting is carried out in Ar gas;

and/or the pressure of the casting is 5.5 ten thousand Pa;

and/or the cooling speed of the casting is 10²DEG C/sec-10⁴DEG C/sec;

and/or the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence;

and/or the particle size of the D50 after powder preparation is 3.2-5.0 μm;

and/or the molding mode is a magnetic field molding method;

and/or, the sintering is three times;

and/or the temperature of the heat treatment is 490-525 ℃;

and/or, the time of the heat treatment is 3 hours;

and/or, the heat treatment is carried out in Ar gas.

4. The R-T-B based magnetic material according to claim 3, wherein the R-T-B based magnetic material has any one of the following components in percentage by weight:

numbering Nd Pr Dy Tb Fe B Al Ga Cu Zr 1 10.492 19.498 0 0.95 66.071 0.952 0.801 0.452 0.392 0.392 2 10.202 19.791 1.296 1.501 63.961 0.981 0.472 0.801 0.503 0.492 3 14.301 16.792 0.98 1.202 63.903 0.932 0.723 0.248 0.352 0.567 4 13.468 15.067 0.512 0.451 67.506 0.897 1.496 0.052 0.239 0.312 5 13.684 18.548 0 0.765 62.917 1.033 0 1.503 0.802 0.748

Wherein the units of numbers are wt.%;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the hydrogen absorption temperature of the hydrogen absorption crushing is 20-25 ℃;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the hydrogen absorption pressure of the hydrogen absorption crushing is 0.15 MPa;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the dehydrogenation temperature of the hydrogen absorption crushing is 500-550 ℃;

and/or when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro-crushing, the micro-crushing is jet mill crushing; the environment of the jet mill during crushing is under nitrogen with oxygen content of below 150 ppm; the pressure of the jet mill during crushing is 0.38 MPa;

and/or, when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro-crushing, zinc stearate is added into the powder preparation; the addition amount of the zinc stearate is 0.12 percent of the weight of the mixed powder;

and/or, when the molding mode is a magnetic field molding method, the magnetic field molding is a two-time molding: the pressure at the time of primary molding was 0.35ton/cm²And the pressure at the time of the second molding was 1.3ton/cm²；

And/or, when the molding mode is a magnetic field molding method, the magnetic field molding is a two-time molding: the magnetic field intensity during primary molding is 1.6T, and no magnetic field is generated during secondary molding;

and/or, when the sintering is carried out for three times, the temperature during the primary sintering is 300 ℃, the temperature during the secondary sintering is 600 ℃, and the temperature during the third sintering is 1080-1088 ℃, such as 1085 ℃;

and/or, when the sintering is carried out for three times, the time for the primary sintering is 1 hour, the time for the secondary sintering is 1 hour, and the time for the third sintering is 6 hours;

and/or the temperature of the heat treatment is 510 ℃.

5. A preparation method of an R-T-B magnetic material comprises the following steps: smelting, casting, pulverizing, molding, sintering and heat treating the raw materials to obtain the R-T-B magnetic material;

the raw materials of the R-T-B series magnetic material comprise the following components in percentage by weight:

29.50 wt.% to 33.30 wt.% R; r is rare earth element and contains Pr and R^H(ii) a The Pr is more than or equal to 15.00 wt.%; said R^HContaining Tb and/or Dy;

0.24 wt.% to 0.80 wt.% Cu;

0.30 wt.% to 0.75 wt.% Zr;

0 wt.% to 1.52 wt.% Al;

0.90 wt.% to 1.03 wt.% of B;

and, 0.05 wt.% to 1.50 wt.% Ga.

6. The method according to claim 5, wherein the amount of R is 31.00 wt.% to 33.00 wt.%;

and/or, said R further comprises Nd;

and/or, the content of Pr is 15.07 wt.% to 19.80 wt.%;

and/or, said R^HIs 0.77 wt.% to 2.80 wt.%;

and/or, said R^HThe mass ratio of the mass of (A) to the mass of R is 0.023-0.085;

and/or, said R^HTb and/or Dy;

and/or, when said R is^HWhen Tb is contained, the content of Tb is 0.45 wt.% to 1.50 wt.%;

and/or, when said R is^HWhen Dy is contained, the content of Dy is 0.51-1.30 wt%;

and/or the content of Cu is 0.35-0.50 wt.%;

and/or, the Zr content is 0.31 wt.% to 0.57 wt.%;

and/or the content of Al is 0.47-0.80 wt.%;

and/or, the content of B is 0.93 wt.% to 0.99 wt.%;

and/or the Ga content is 0.25 wt.% to 0.80 wt.%;

and/or, said T comprises Fe;

and/or the smelting temperature is 1400-1500 ℃;

and/or the pressure of the smelting is 5 × 10^-2Pa；

And/or, said casting is carried out in Ar gas;

and/or the pressure of the casting is 5.5 ten thousand Pa;

and/or the cooling speed of the casting is 10²DEG C/sec-10⁴DEG C/sec;

and/or the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence;

and/or the particle size of the D50 after powder preparation is 3.2-5.0 μm;

and/or the molding mode is a magnetic field molding method;

and/or, the sintering is three times;

and/or the temperature of the heat treatment is 490-525 ℃;

and/or, the time of the heat treatment is 3 hours;

and/or, the heat treatment is carried out in Ar gas.

7. The method of claim 6, wherein the amount of R is 32.80 wt.%;

and/or, when said R further comprises Nd, said R is selected from Nd, Pr and R^HComposition is carried out;

and/or, when said R further comprises Nd, said Nd is present in an amount of 10.20 wt.% to 14.30 wt.%;

and/or, the content of Pr is 16.80 wt.% to 19.50 wt.%;

and/or, said R^HIs 0.96 wt.% to 2.20 wt.%;

and/or, said R^HThe mass ratio of the mass of (A) to the mass of R is 0.032-0.066;

and/or, when said R is^HWhen Tb is contained, the content of Tb is 0.77 wt.% to 1.20 wt.%;

and/or, when said R is^HWhen Dy is contained, the content of Dy is 1.00 wt.%;

and/or, the Cu content is 0.40 wt.%;

and/or, the Zr content is 0.40 wt.% to 0.50 wt.%;

and/or, said Al content is 0.72 wt.%;

and/or, said B content is 0.95 wt.%;

and/or, the Ga content is 0.45 wt.%;

and/or, when said T comprises Fe, said Fe is present in an amount of 62.92 wt.% to 67.52 wt.%;

and/or, T is composed of Fe, Cu and Zr;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the hydrogen absorption temperature of the hydrogen absorption crushing is 20-25 ℃;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the hydrogen absorption pressure of the hydrogen absorption crushing is 0.15 MPa;

and/or when the powder preparation mode comprises hydrogen absorption crushing and micro crushing in sequence, the dehydrogenation temperature of the hydrogen absorption crushing is 500-550 ℃;

and/or when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro-crushing, the micro-crushing is jet mill crushing;

and/or, when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro-crushing, zinc stearate is added into the powder preparation;

and/or, when the molding mode is a magnetic field molding method, the magnetic field molding is twice molding;

and/or when the sintering is carried out for three times, the temperature during the primary sintering is 300 ℃, the temperature during the secondary sintering is 600 ℃, and the temperature during the third sintering is 1080-1088 ℃;

and/or, when the sintering is carried out for three times, the time for the primary sintering is 1 hour, the time for the secondary sintering is 1 hour, and the time for the third sintering is 6 hours;

and/or the temperature of the heat treatment is 510 ℃.

8. The method according to claim 7, wherein when R further contains Nd, the content of Nd is 10.50 wt.% to 13.68 wt.%;

and/or, the Pr content is 18.55 wt.%;

and/or, said R^HIs 1.00 wt.%;

and/or, when said R is^HWhen Tb is included, the Tb content is 1.00 wt.%;

and/or, when said T comprises Fe, said Fe is present in an amount of 63.94 wt.%;

and/or said R-T-B based magnetic material is composed of said R, said Cu, said Zr, said Al, said B, said Ga, and said Fe;

and/or when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro crushing, the micro crushing is jet mill crushing, and the environment of the jet mill crushing is under nitrogen with oxygen content of below 150 ppm;

and/or when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro crushing, the micro crushing is jet mill crushing, and the pressure of the jet mill crushing is 0.38 MPa;

and/or, when the powder preparation mode sequentially comprises hydrogen absorption crushing and micro-crushing, zinc stearate is added into the powder preparation; the addition amount of the zinc stearate is 0.12 percent of the weight of the mixed powder;

and/or, when the molding mode is a magnetic field molding method, the magnetic field molding is a two-time molding: the pressure at the time of primary molding was 0.35ton/cm²And the pressure at the time of the second molding was 1.3ton/cm²；

And/or, when the molding mode is a magnetic field molding method, the magnetic field molding is a two-time molding: the magnetic field intensity during primary molding is 1.6T, and no magnetic field is generated during secondary molding;

and/or when the sintering is carried out for three times, the temperature during the primary sintering is 300 ℃, the temperature during the secondary sintering is 600 ℃, and the temperature during the third sintering is 1085 ℃.

9. The method according to claim 8, wherein the raw material comprises, in weight percent, any of the following:

numbering Nd Pr Dy Tb Fe B Al Ga Cu Zr 1 10.5 19.5 0 1.0 66 0.95 0.8 0.45 0.4 0.4 2 10.2 19.8 1.3 1.5 63.94 0.99 0.47 0.8 0.5 0.5 3 14.3 16.8 1.0 1.2 63.88 0.93 0.72 0.25 0.35 0.57 4 13.47 15.07 0.51 0.45 67.52 0.90 1.50 0.05 0.24 0.30 5 13.68 18.55 0 0.77 62.92 1.03 0 1.50 0.80 0.75

Wherein the units of numbers are wt.%.

10. An R-T-B magnetic material produced by the method for producing an R-T-B magnetic material according to any one of claims 5to 9.

Technical Field

The invention relates to an R-T-B magnetic material and a preparation method thereof.

Background

By Nd₂Fe₁₄The neodymium iron boron (NdFeB) magnet material with B as the main component has higher remanence, coercive force and maximum energy product, has excellent comprehensive magnetic property and shouldThe method is used in wind power generation, new energy vehicles, variable frequency household appliances and the like. At present, the rare earth component in the neodymium iron boron magnet material in the prior art is mainly neodymium, and only a small amount of praseodymium is contained. Although there are few reports in the prior art that a part of neodymium is replaced by praseodymium to improve the performance of the magnet material, the improvement degree is limited, and the improvement is not significant. On the other hand, in the prior art, the neodymium iron boron magnet material with good coercive force and remanence performance also needs to depend on a large amount of addition of heavy rare earth elements, and the cost is expensive.

Disclosure of Invention

The invention aims to solve the technical problem that the existing R-T-B magnetic material is single in composition, and therefore, the invention provides the R-T-B magnetic material and the preparation method thereof.

The invention provides an R-T-B magnetic material, which is characterized by comprising the following components in percentage by weight:

29.50 wt.% to 33.28 wt.% R; r is rare earth element and contains Pr and R^H(ii) a The Pr is more than or equal to 15.00 wt.%; said R^HContaining Tb and/or Dy;

0.24 wt.% to 0.80 wt.% Cu;

0.31 wt.% to 0.75 wt.% Zr;

0 wt.% to 1.52 wt.% Al;

0.90 wt.% to 1.03 wt.% of B;

and, 0.05 wt.% to 1.50 wt.% Ga.

In one embodiment, the definitions, contents, and the like of some components in the magnetic material are as follows, and the definitions, contents, and the like of the components which are not referred to are as described in any of the preceding embodiments (hereinafter, referred to as "in one embodiment"): the content of R can be 30.94-33.00 wt.%, and can be 32.79 wt.%.

In one scheme, R consists of Pr and R^HAnd (4) forming.

In a certain aspect, the R can further comprise Nd.

In one aspect, when theWhen R of (A) further contains Nd, the R is selected from Nd, Pr and R^HAnd (4) forming.

In a certain aspect, when R further comprises Nd, the amount of Nd can be 10.20 wt.% to 14.30 wt.%, or 10.49 wt.% to 13.68 wt.%, or 13.47 wt.%.

In a certain embodiment, the content of Pr may be 15.07 wt.% to 19.79 wt.%, 16.79 wt.% to 19.50 wt.%, and may also be 18.55 wt.%.

In one embodiment, R is^HThe content of (b) can be 0.77 wt.% to 2.80 wt.%, or 0.95 wt.% to 2.20 wt.%, or 0.96 wt.%.

In one embodiment, R is^HThe mass ratio of the mass of (A) to the mass of R can be 0.023-0.085, can be 0.031-0.066, and can also be 0.033.

Said R^HAre conventional heavy rare earth elements in the art.

In one embodiment, R is^HTb and/or Dy.

In one aspect, when R is said^HWhen Tb is contained, the content of Tb can be 0.45 wt.% to 1.50 wt.%, or 0.77 wt.% to 1.20 wt.%, or 0.95 wt.%.

In one aspect, when R is said^HWhen Dy is contained, the content of Dy may be 0.51 wt.% to 1.30 wt.%, or may be 0.98 wt.%.

In a certain embodiment, the Cu content may be 0.35 wt.% to 0.50 wt.%, and may be 0.39 wt.%.

In a certain embodiment, the content of Zr may be 0.39 wt.% to 0.57 wt.%, and may be 0.49 wt.%.

In a certain embodiment, the Al content may be 0.47 wt.% to 0.80 wt.%, or 0.72 wt.%.

In a certain embodiment, the content of B may be 0.93 wt.% to 0.98 wt.%, and may be 0.95 wt.%.

In a certain embodiment, the Ga content may be 0.25 wt.% to 0.80 wt.%, or 0.45 wt.%.

In addition to the transition metals, T in the R-T-B magnetic material may also comprise other transition metals conventional in the art.

In one embodiment, the T may comprise Fe.

In a certain aspect, when T may comprise Fe, the amount of Fe may be from 62.92 wt.% to 67.51 wt.%, from 63.90 wt.% to 66.07 wt.%, and from 63.96 wt.%.

In one embodiment, T may be comprised of Fe, Cu, and Zr.

In one embodiment, the R-T-B based magnetic material may be composed of the R, the Cu, the Zr, the Al, the B, the Ga, and the Fe.

The R-T-B magnetic material may contain inevitable impurities such as carbon.

In a certain scheme, the R-T-B series magnetic material comprises the following components in percentage by weight:

numbering	Nd	Pr	Dy	Tb	Fe	B	Al	Ga	Cu	Zr
											1	10.492	19.498	0	0.95	66.071	0.952	0.801	0.452	0.392	0.392
2	10.202	19.791	1.296	1.501	63.961	0.981	0.472	0.801	0.503	0.492
											3	14.301	16.792	0.98	1.202	63.903	0.932	0.723	0.248	0.352	0.567
4	13.468	15.067	0.512	0.451	67.506	0.897	1.496	0.052	0.239	0.312
											5	13.684	18.548	0	0.765	62.917	1.033	0	1.503	0.802	0.748

The numbers in the table are in wt.%.

The R-T-B magnetic material can be prepared according to the conventional method of the materials in the field.

In one embodiment, the R-T-B based magnetic material can be prepared according to a first method comprising the steps of: the raw materials are subjected to smelting, casting, powder making, molding, sintering and heat treatment to obtain the R-T-B magnetic material.

In the first method, a person skilled in the art can adjust the components of the target product R-T-B series magnetic material by combining the loss, the introduced impurities and the like in the preparation process to obtain the components of the raw materials.

In the first method, the smelting can be conventional smelting in the field, the temperature of the smelting can be 1400 ℃ and 1500 ℃, and the pressure of the smelting can be 5 × 10^-2Pa。

In the first method, the casting may be a casting conventional in the art. The casting may be performed in Ar gas. The casting pressure may be 5.5 ten thousand Pa. The cooling rate of the casting may be 10²DEG C/sec-10⁴DEG C/sec.

In the first method, the powder preparation can be conventional powder preparation in the field. The powder preparation method comprises the steps of hydrogen absorption crushing and micro-crushing in sequence. The particle size of the D50 after pulverization can be 3.2-5.0 μm.

The hydrogen absorption fragmentation may be a hydrogen absorption fragmentation as is conventional in the art. The hydrogen absorption temperature for hydrogen absorption and crushing can be 20-25 ℃. The hydrogen absorption pressure of the hydrogen absorption crushing can be 0.15 MPa. The dehydrogenation temperature of hydrogen absorption and crushing can be 500-550 ℃.

The micronization may be any micronization conventional in the art. The micro-pulverization can be jet milling pulverization. The environment of the jet mill during the pulverization can be under nitrogen with oxygen content of below 150 ppm. The pressure of the jet mill during crushing can be 0.38 MPa.

Zinc stearate can also be added into the powder. The addition amount of the zinc stearate can be 0.12 percent of the weight of the mixed powder.

In the first method, the molding may be a molding conventionally used in the art. The molding method can be a magnetic field molding method.

When the molding manner may be a magnetic field molding method, the magnetic field molding may be a two-time molding. When the magnetic field molding is carried out twice, the pressure at the time of primary molding may be 0.35ton/cm²A second timeThe pressure during molding may be 1.3ton/cm². When the magnetic field molding is twice molding, the magnetic field intensity during the primary molding can be 1.6T, and no magnetic field is generated during the secondary molding.

In the first method, the sintering may be sintering conventional in the art. The sintering can be three times. When the sintering is carried out for three times, the temperature during the first sintering can be 300 ℃, the temperature during the second sintering can be 600 ℃, and the temperature during the third sintering can be 1080-1088 ℃ (for example 1085 ℃). When the sintering is performed three times, the time for the first sintering may be 1 hour, the time for the second sintering may be 1 hour, and the time for the third sintering may be 6 hours.

In the first method, the heat treatment may be a heat treatment conventional in the art. The temperature of the heat treatment may be 490 c to 525 c (e.g., 510 c). The time for the heat treatment may be 3 hours. The heat treatment may be performed in Ar gas.

The invention also provides a preparation method of the R-T-B magnetic material, which comprises the following steps: smelting, casting, pulverizing, molding, sintering and heat treating the raw materials to obtain the R-T-B magnetic material;

the raw materials of the R-T-B series magnetic material comprise the following components in percentage by weight:

29.50 wt.% to 33.30 wt.% R; r is rare earth element and contains Pr and R^H(ii) a The Pr is more than or equal to 15.00 wt.%; said R^HContaining Tb and/or Dy;

0.24 wt.% to 0.80 wt.% Cu;

0.30 wt.% to 0.75 wt.% Zr;

0 wt.% to 1.52 wt.% Al;

0.90 wt.% to 1.03 wt.% of B;

and, 0.05 wt.% to 1.50 wt.% Ga.

In the preparation method, the definitions, contents, preparation method parameters and the like of certain components in the raw materials are as follows, and the definitions, contents, preparation method parameters and the like of the components which are not referred to are as described in any of the previous schemes (hereinafter referred to as "in the preparation method"): the content of R can be 31.00 wt.% to 33.00 wt.%, and can be 32.80 wt.%.

In the preparation method, the R is formed by Pr and R^HAnd (4) forming.

In the preparation method, the R may further include Nd.

In the preparation method, when the R also contains Nd, the R is formed by Nd, Pr and R^HAnd (4) forming.

In the preparation method, when R further contains Nd, the content of Nd may be 10.20 wt.% to 14.30 wt.%, or 10.50 wt.% to 13.68 wt.%, or 13.47 wt.%.

In the preparation method, the content of Pr can be 15.07 wt.% to 19.80 wt.%, 16.80 wt.% to 19.50 wt.%, and 18.55 wt.%.

In the preparation method, the R^HThe content of (b) can be 0.77 wt.% to 2.80 wt.%, or 0.96 wt.% to 2.20 wt.%, or can be 1.00 wt.%.

In the preparation method, the R^HThe mass ratio of the amount of (A) to the amount of R may be 0.023 to 0.085, or 0.032 to 0.066.

Said R^HAre conventional heavy rare earth elements in the art.

In the preparation method, the R^HTb and/or Dy.

In the preparation method, when R is^HWhen Tb is contained, the content of Tb can be 0.45 wt.% to 1.50 wt.%, or 0.77 wt.% to 1.20 wt.%, or 1.00 wt.%.

In the preparation method, when R is^HWhen Dy is contained, the content of Dy may be 0.51 wt.% to 1.30 wt.%, or may be 1.00 wt.%.

In the preparation method, the content of Cu may be 0.35 wt.% to 0.50 wt.%, and may be 0.40 wt.%.

In the preparation method, the content of Zr can be 0.31 wt.% to 0.57 wt.%, and can be 0.40 wt.% to 0.50 wt.%.

In the preparation method, the content of Al may be 0.47 wt.% to 0.80 wt.%, and may be 0.72 wt.%.

In the preparation method, the content of B can be 0.93 wt.% to 0.99 wt.%, and can be 0.95 wt.%.

In the preparation method, the content of Ga can be 0.25 wt.% to 0.80 wt.%, and can be 0.45 wt.%.

In addition to the transition metals, T in the R-T-B magnetic material may also comprise other transition metals conventional in the art.

In the preparation method, the T may comprise Fe.

In the preparation method, when T may include Fe, the content of Fe may be 62.92 wt.% to 67.52 wt.%, 63.88 wt.% to 66.00 wt.%, or 63.94 wt.%.

In the preparation method, the T can be composed of Fe, Cu and Zr.

In the above production method, the R-T-B based magnetic material may be composed of the R, the Cu, the Zr, the Al, the B, the Ga, and the Fe.

The raw material may contain inevitable impurities such as carbon element.

The R-T-B magnetic material may contain inevitable impurities such as carbon.

In the preparation method, the raw materials comprise the following components in percentage by weight:

numbering	Nd	Pr	Dy	Tb	Fe	B	Al	Ga	Cu	Zr
											1	10.5	19.5	0	1.0	66	0.95	0.8	0.45	0.4	0.4
2	10.2	19.8	1.3	1.5	63.94	0.99	0.47	0.8	0.5	0.5
											3	14.3	16.8	1.0	1.2	63.88	0.93	0.72	0.25	0.35	0.57
4	13.47	15.07	0.51	0.45	67.52	0.90	1.50	0.05	0.24	0.30
											5	13.68	18.55	0	0.77	62.92	1.03	0	1.50	0.80	0.75

The numbers in the table are in wt.%.

In the preparation method, the smelting can be the smelting conventional in the field, the temperature of the smelting can be 1400 ℃ and 1500 ℃, and the pressure of the smelting can be 5 × 10^-2Pa。

In the preparation method, the casting may be a casting conventional in the art. The casting may be performed in Ar gas. The casting pressure may be 5.5 ten thousand Pa. The cooling rate of the casting may be 10²DEG C/sec-10⁴DEG C/sec.

In the preparation method, the powder preparation can be conventional powder preparation in the field. The powder preparation method comprises the steps of hydrogen absorption crushing and micro-crushing in sequence. The particle size of the D50 after pulverization can be 3.2-5.0 μm.

The hydrogen absorption fragmentation may be a hydrogen absorption fragmentation as is conventional in the art. The hydrogen absorption temperature for hydrogen absorption and crushing can be 20-25 ℃. The hydrogen absorption pressure of the hydrogen absorption crushing can be 0.15 MPa. The dehydrogenation temperature of hydrogen absorption and crushing can be 500-550 ℃.

The micronization may be any micronization conventional in the art. The micro-pulverization can be jet milling pulverization. The environment of the jet mill during the pulverization can be under nitrogen with oxygen content of below 150 ppm. The pressure of the jet mill during crushing can be 0.38 MPa.

Zinc stearate can also be added into the powder. The addition amount of the zinc stearate can be 0.12 percent of the weight of the mixed powder.

In the preparation method, the molding may be a molding that is conventional in the art. The molding method can be a magnetic field molding method.

When the molding manner may be a magnetic field molding method, the magnetic field molding may be a two-time molding. When the magnetic field molding is carried out twice, the pressure at the time of primary molding may be 0.35ton/cm²The pressure at the second molding may be 1.3ton/cm². When the magnetic field molding is twice molding, the magnetic field intensity during the primary molding can be 1.6T, and no magnetic field is generated during the secondary molding.

In the preparation method, the sintering may be sintering conventional in the art. The sintering can be three times. When the sintering is carried out for three times, the temperature during the first sintering can be 300 ℃, the temperature during the second sintering can be 600 ℃, and the temperature during the third sintering can be 1080-1088 ℃ (for example 1085 ℃). When the sintering is performed three times, the time for the first sintering may be 1 hour, the time for the second sintering may be 1 hour, and the time for the third sintering may be 6 hours.

In the preparation method, the heat treatment may be a heat treatment conventional in the art. The temperature of the heat treatment may be 490 c to 525 c (e.g., 510 c). The time for the heat treatment may be 3 hours. The heat treatment may be performed in Ar gas.

The invention also provides an R-T-B magnetic material which is prepared according to the preparation method of the R-T-B magnetic material.

Unless otherwise indicated, the wt.% in the claims and the description have the following meanings:

1. wt.% in the raw material formulation refers to the percentage of an element relative to the sum of all raw materials;

2. the wt.% in the elemental analysis of the resulting material generally refers to the percentage of an element relative to the mass of the product to which the ICP-OES measured data (percentage of an element relative to the sum of all ICP-OES measured elements) is close.

The above preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention without departing from the common general knowledge in the art.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows: the magnetic material of the invention has better remanence, coercive force, temperature coefficient and the like.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Table 1 raw material formulation of example (number in wt.% in table)