R-t-b based permanent magnet material, raw material composition, production method, and use

Abstract

The application discloses an R-T-B system permanent magnet material, a raw material composition, a preparation method and application. The R-T-B system permanent magnet material comprises the following components: R, B, Ti, Cu and Ga; R is 29.0-31.5 wt%; B is 0.87-0.91 wt%; the R is a rare earth element; the R comprises a light rare earth element RL, and the RL comprises Nd; the Ti, the Cu and the Ga satisfy the following relationship formulas: (1) 0 < Ti / (Cu+Ga) <= 0.8; (2) 0.3 <= (Ti+Cu+Ga) <= 0.5; wt% refers to a weight percentage in the R-T-B system permanent magnet material; the balance is Fe and Co and inevitable impurities. The R-T-B system permanent magnet material in the application has excellent performance: the amorphous boundary diffusion product Br >= 14.50 kGs, Hcj >= 15 kOe, the crystal boundary diffusion product Br >= 14.50 kGs, Hcj >= 25.5 kOe, and the synchronous improvement of Br and Hcj is realized.

Description

[0001] The present application is a divisional of the patent application with the application date of December 31, 2019, the application number of 201911425263.6, and the invention name of "R-T-B series permanent magnet material, raw material composition, preparation method, and application". TECHNICAL FIELD

[0002] The present application relates to an R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application. BACKGROUND

[0003] Permanent magnet materials have been developed as key materials to support electronic devices, and the development direction is towards high magnetic energy product and high coercivity. R-T-B series permanent magnet materials (R is at least one of rare earth elements) are known as the highest performance magnet in permanent magnets, and are used in various motors such as voice coil motors (VCM) for hard disk drives, motors for electric vehicles (EV, HV, PHV, etc.), industrial equipment, and household appliances.

[0004] For R-T-B series sintered magnets, the coercivity Hcj of the magnet is usually improved by adding heavy rare earth such as Dy, Tb, or using heavy rare earth grain boundary diffusion, but heavy rare earth resources are scarce and expensive. In the prior art, the B content of the magnet is reduced, and Cu / Al / Ga is added to form R6-T 13 X (X refers to Cu / Al / Ga) optimizes the grain boundary, improves Hcj, and thus reduces the amount of heavy rare earth used; but the reduction of B content causes R2T 14 The volume fraction of B main phase decreases, resulting in a decrease in the residual magnetic flux density Br of the magnet.

[0005] Therefore, there is an urgent need for an R-T-B series permanent magnet material that can simultaneously improve Hcj and Br. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the defect that the Hcj and Br of the R-T-B series permanent magnet material in the prior art cannot be simultaneously improved, and to provide an R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application.

[0007] The present application solves the above technical problems by the following technical solutions:

[0008] The present application provides an R-T-B series permanent magnet material, which comprises the following components in terms of weight percentage: R, B, Ti, Cu, and Ga.

[0009] R: 29.0-31.5wt%;

[0010] B: 0.87-0.91wt%;

[0011] The R is a rare earth element, the R includes a light rare earth element RL, the RL includes Nd; the Ti, the Cu and the Ga satisfy the following relationship:

[0012] (1) 0 < Ti / (Cu+Ga) ≤ 0.8;

[0013] (2) 0.3 ≤ (Ti+Cu+Ga) ≤ 0.5;

[0014] wt% refers to a weight percentage in the R-T-B based permanent magnet material;

[0015] the balance is Fe and Co and inevitable impurities.

[0016] In the present application, the R can also include a heavy rare earth element RH.

[0017] In the present application, the Ti / (Cu+Ga) is preferably 0.01-0.5 or 0.003-0.8, for example 0.25.

[0018] In the present application, the (Ti+Cu+Ga) is preferably 0.45-0.5.

[0019] In the present application, preferably, a Ti-rich R m (Fe+Co) 1-m-x-y-z (Cu x Ga y Ti z enriched phase is present at the grain boundary of the R-T-B based permanent magnet material, wherein: m 25.5-30at%, x 0-2at%, y 1.5-2.5at%, z 5.5-6.5at%, at% refers to atomic percentage.

[0020] Preferably, the m is 25.5-29.6at%, for example 28.8at%, 28.9at%, 29.1at% or 29.4at%.

[0021] Preferably, the x is 0.5-2at% or 0-1.7at%, for example 1.5at% or 1.6at%.

[0022] Preferably, the y is 1.5-2.3at%, for example 2.4at%, 1.6at% or 1.8at%.

[0023] Preferably, the z is 5.5-5.9at%, for example 5.8at%.

[0024] Preferably, the R m (Fe+Co) 1-m-x-y-z (Cu x Ga yTi z ) the enrichment phase can be R 28.8 (Fe+Co) 61.5 Cu 1.7 Ga 2.4 Ti 5.5 , R 29.6 (Fe+Co) 60.8 Cu 1.5 Ga 1.6 Ti 6.5 , R 28.9 (Fe+Co) 63.8 Ga 1.5 Ti 5.8 , R 29.1 (Fe+Co) 63.1 Cu 0.5 Ga 1.8 Ti 5.5 or R 29.4 (Fe+Co) 60.8 Cu 1.6 Ga 2.3 Ti 5.9 .

[0025] The grain boundary of the R-T-B system permanent magnet material generally refers to the connection between two or more main phase grains.

[0026] In the present application, the content of R is preferably 29-31wt% or 29.5-31.5wt%, for example 29.7wt%, 30wt% or 30.5wt%, and wt% refers to the weight percentage in the R-T-B system permanent magnet material.

[0027] In the present application, the content of RH is preferably 0-1wt% and not 1wt%, for example 0.2wt% or 0.7wt%, and wt% refers to the weight percentage in the R-T-B system permanent magnet material.

[0028] In the present application, the content of B is preferably 0.89-0.905wt%, for example 0.9wt%, and wt% refers to the weight percentage in the R-T-B system permanent magnet material.

[0029] In the present application, the content of Ti is preferably 0-0.2wt% and not 0, for example 0.001-0.2wt%, and again for example 0.005wt% or 0.1wt%, and wt% refers to the weight percentage in the R-T-B system permanent magnet material.

[0030] In the present application, the content of Cu is preferably 0-0.15wt%, for example 0.1wt% or 0.05wt%, and wt% refers to the weight percentage in the R-T-B system permanent magnet material.

[0031] In the present application, the content of Ga is preferably in the range of 0.2-0.4wt%, such as 0.345wt%, 0.15wt%, 0.25wt% or 0.3wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material.

[0032] In the present application, the content of Co can be in the range of 0.5-2wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material.

[0033] In the present application, one or more of La, Ce, Pr, Sm and Eu can be further included in the RL.

[0034] In the present application, one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu can be included in the RH.

[0035] In the present application, the components and contents of the R-T-B based permanent magnet material can be conventional in the art. Preferably, the R-T-B based permanent magnet material comprises the following components in weight percentage:

[0036] R 29.0-31.0wt%; RH 0-1wt% and not 1wt%; B 0.87-0.91wt%; Ti 0-0.2wt% and not 0; Cu 0-0.15wt%; Ga 0.2-0.4wt%; Co 0.5-2wt%; wt% refers to the weight percentage of the R-T-B based permanent magnet material, the balance being Fe and unavoidable impurities.

[0037] Preferably, the R-T-B based permanent magnet material comprises the following components in weight percentage: R 29.5-31.5wt%; RH 0-1wt% and not 1wt%; B 0.87-0.91wt%; Ti 0-0.2wt% and not 0; Cu 0-0.15wt%; Ga 0.2-0.4wt%; Co 0.5-2wt%; wt% refers to the weight percentage of the R-T-B based permanent magnet material, the balance being Fe and unavoidable impurities.

[0038] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in weight percentage: PrNd 29wt%, B 0.87wt%, Ti 0.005wt%, Cu 0.15wt%, Ga 0.345wt%, Co 2wt%, wt% refers to the weight percentage of the R-T-B based permanent magnet material, the balance being Fe and unavoidable impurities.

[0039] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in percentage by weight: PrNd 30.8 wt%, Dy 0.2 wt%, B 0.91 wt%, Ti 0.2 wt%, Cu 0.1 wt%, Ga 0.15 wt%, Co 2 wt%, and the balance being Fe and inevitable impurities, wherein the wt% refers to the percentage by weight of the R-T-B based permanent magnet material.

[0040] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in percentage by weight: PrNd 30.8 wt%, Dy 0.2 wt%, B 0.91 wt%, Ti 0.2 wt%, Cu 0.1 wt%, Ga 0.15 wt%, Co 2 wt%, and the balance being Fe and inevitable impurities, wherein the wt% refers to the percentage by weight of the R-T-B based permanent magnet material.

[0041] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in percentage by weight: PrNd 30.8 wt%, Dy 0.2 wt%, B 0.91 wt%, Ti 0.2 wt%, Cu 0.1 wt%, Ga 0.15 wt%, Co 2 wt%, and the balance being Fe and inevitable impurities, wherein the wt% refers to the percentage by weight of the R-T-B based permanent magnet material.

[0042] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in percentage by weight: PrNd 30.8 wt%, Dy 0.2 wt%, B 0.91 wt%, Ti 0.2 wt%, Cu 0.1 wt%, Ga 0.15 wt%, Co 2 wt%, and the balance being Fe and inevitable impurities, wherein the wt% refers to the percentage by weight of the R-T-B based permanent magnet material.

[0043] In a preferred embodiment of the present application, the R-T-B based permanent magnet material comprises the following components in percentage by weight: PrNd 30.8 wt%, Dy 0.2 wt%, B 0.91 wt%, Ti 0.2 wt%, Cu 0.1 wt%, Ga 0.15 wt%, Co 2 wt%, and the balance being Fe and inevitable impurities, wherein the wt% refers to the percentage by weight of the R-T-B based permanent magnet material.

[0044] The present application also provides an R-T-B based permanent magnet material comprising the following components: R, B, Ti, Cu and Ga;

[0045] The R is a rare earth element, the R includes a light rare earth element RL, the RL includes Nd; the R-T-B system permanent magnet material has a Ti-rich R at the grain boundary m (Fe+Co) 1-m-x-y-z (Cu x Ga y Ti z )rich phase, wherein: m 25.5-30at%, x 0-2at%, y 1.5-2.5at%, z 5.5-6.5at%, at% refers to atomic percentage.

[0046] The R can further include a heavy rare earth element RH.

[0047] The application also provides a raw material composition of the R-T-B system permanent magnet material, which includes the following components in percentage by weight: R, B, Ti, Cu and Ga;

[0048] R: 29.0-31.0wt%;

[0049] B: 0.87-0.91wt%;

[0050] The R is a rare earth element, the R includes a light rare earth element RL, the RL includes Nd; the Ti, the Cu and the Ga satisfy the following relationship:

[0051] (1) 0

[0052] (2) 0.3≤(Ti+Cu+Ga)≤0.5;

[0053] wt% refers to percentage by weight of the raw material composition of the R-T-B system permanent magnet material;

[0054] The balance is Fe and Co and inevitable impurities.

[0055] In the application, preferably, the R can further include a heavy rare earth element RH.

[0056] In the application, the Ti / (Cu+Ga) is preferably 0.01-0.5 or 0.003-0.8, for example 0.25.

[0057] In the application, the (Ti+Cu+Ga) is preferably 0.45-0.5.

[0058] In the application, the content of the R is preferably 29-30.5wt%, for example 29.7wt%, 30wt% or 30.5wt%, wt% refers to percentage by weight of the raw material composition of the R-T-B system permanent magnet material.

[0059] In the present application, the content of RH is preferably 0-1wt% and not 1wt%, for example 0.2wt% or 0.7wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0060] In the present application, the content of B is preferably 0.89-0.905wt%, for example 0.9wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0061] In the present application, the content of Ti is preferably 0-0.2wt% and not 0, for example 0.001-0.2wt%, for example 0.005wt% or 0.1wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0062] In the present application, the content of Cu is preferably 0-0.15wt%, for example 0.1wt% or 0.05wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0063] In the present application, the content of Ga is preferably 0.2-0.4wt%, for example 0.345wt%, 0.15wt%, 0.25wt% or 0.3wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0064] In the present application, the content of Co can be 0.5-2wt%, wt% refers to the weight percentage of the raw material composition of R-T-B permanent magnet material.

[0065] The present application also provides a preparation method of R-T-B permanent magnet material, which comprises the following steps: the molten liquid of the raw material composition of R-T-B permanent magnet material is cast, broken, crushed, shaped, sintered, and then obtained.

[0066] In the present application, the molten liquid of the raw material composition of R-T-B permanent magnet material can be prepared by conventional methods in the art, for example: in a high-frequency vacuum induction melting furnace, and then obtained. The vacuum degree of the melting furnace can be 5×10 -2 Pa. The temperature of the melting can be below 1500℃.

[0067] In the present application, the casting process can be a conventional casting process in the art, for example: in Ar gas atmosphere (for example, 5.5×10 4 Pa of Ar gas atmosphere), cooling at a speed of 10 2 ℃ / second-10 4 ℃ / second, and then obtained.

[0068] In the present application, the crushing process can be a conventional crushing process in the art, for example, hydrogen absorption, dehydrogenation, cooling treatment, etc.

[0069] The hydrogen absorption can be carried out under a hydrogen pressure of 0.15 MPa.

[0070] The dehydrogenation can be carried out under the condition of vacuumizing and temperature rising.

[0071] In the present application, the crushing process can be a conventional crushing process in the art, for example, jet mill crushing.

[0072] Preferably, the crushing process is carried out in an atmosphere with an oxygen content of 100 ppm or less.

[0073] The oxygen content refers to the oxygen or moisture content.

[0074] The pressure in the crushing chamber of the jet mill crushing can be 0.38 MPa.

[0075] The time for the jet mill crushing can be 3 hours.

[0076] After the crushing, a lubricant such as zinc stearate can be added by a conventional means in the art. The amount of the lubricant added can be 0.10-0.15% of the weight of the mixed powder, for example, 0.12%.

[0077] In the present application, the forming process can be a conventional forming process in the art, for example, magnetic field forming or hot pressing and hot deformation.

[0078] In the present application, the sintering process can be a conventional sintering process in the art, for example, preheating, sintering, and cooling under vacuum (for example, under a vacuum of 5 x 10 -3 Pa).

[0079] The preheating temperature can be 300-600°C. The preheating time can be 1-2 h. Preferably, the preheating is carried out at 300°C and 600°C for 1 h, respectively.

[0080] The sintering temperature can be a conventional sintering temperature in the art, for example, 900°C-1100°C, for example, 1040°C.

[0081] The sintering time can be a conventional sintering time in the art, for example, 2 h.

[0082] Before the cooling, Ar gas can be introduced to reach a pressure of 0.1 MPa.

[0083] Preferably, a grain boundary diffusion treatment is further carried out after the sintering.

[0084] The heavy rare earth element in the grain boundary diffusion treatment includes Dy and / or Tb.

[0085] The grain boundary diffusion treatment can be processed by a process conventional in the art, such as Tb sputtering diffusion.

[0086] The temperature of the grain boundary diffusion treatment can be 800-900℃, such as 850℃.

[0087] The time of the grain boundary diffusion treatment can be 12h.

[0088] After the grain boundary diffusion treatment, a heat treatment can also be performed. The temperature of the heat treatment can be 470-510℃, such as 500℃. The time of the heat treatment can be 3h.

[0089] The application also provides an R-T-B based permanent magnet material prepared by the above method.

[0090] The application also provides an application of the R-T-B based permanent magnet material as an electronic component.

[0091] The electronic component can be conventional in the art, such as an electronic component in a motor.

[0092] On the basis of common knowledge in the art, the above preferred conditions can be combined arbitrarily, i.e. to obtain each preferred example of the application.

[0093] The reagents and raw materials used in the application are commercially available.

[0094] The positive progress effect of the application is that:

[0095] The R-T-B based permanent magnet material in the application has excellent performance: amorphous grain boundary diffusion product: Br≥14.50kGs, Hcj≥15kOe, grain boundary diffusion product: Br≥14.50kGs, Hcj≥25.5kOe, which realizes the synchronous improvement of Br and Hcj. BRIEF DESCRIPTION OF DRAWINGS

[0096] Figure 1 EPMA distribution map of Ti for sintered magnet of Example 3. DETAILED DESCRIPTION

[0097] The application will be further described by way of examples, but the application is not limited to the examples. The experimental methods in the following examples, for which no specific conditions are indicated, are selected according to conventional methods and conditions, or according to the instructions of the commercial products.

[0098] Table 1 Formulation of raw material composition of R-T-B based permanent magnet material (wt%)

[0099]

[0100] The R-T-B sintered magnet production method in Examples 1 to 5 and Comparative Examples 1 to 6 is as follows:

[0101] (1) Melting process: The prepared raw materials were put into an alumina crucible according to the formulation shown in Table 1, and vacuum melting was performed at a temperature of 1500°C or lower in a high-frequency vacuum induction melting furnace under a vacuum of 5 x 10 -2 Pa.

[0102] (2) Casting process: After vacuum melting, Ar gas was introduced into the melting furnace to make the gas pressure reach 5.5 x 104Pa, and then casting was performed to obtain an alloy ingot at a cooling rate of 10 2 °C / sec to 10 4 °C / sec.

[0103] (3) Hydrogen decrepitation process: The hydrogen decrepitation furnace in which the rapidly solidified alloy was placed was evacuated, and then 99.9% pure hydrogen gas was introduced into the hydrogen decrepitation furnace, and the hydrogen pressure was maintained at 0.15 MPa. After sufficient hydrogen absorption, the hydrogen was removed while the temperature was increased, and sufficient dehydrogenation was performed. Then, the hydrogen decrepitated powder was obtained by cooling.

[0104] (4) Fine powdering process: The hydrogen decrepitated powder was subjected to air jet milling for 3 hours under a nitrogen atmosphere having an oxygen gas content of 100 ppm or less at a powdering chamber pressure of 0.38 MPa to obtain fine powder. The oxygen gas refers to oxygen or moisture.

[0105] (5) Zinc stearate was added to the air jet milled powder, and the amount of zinc stearate added was 0.12% by weight of the mixed powder, and then the mixture was thoroughly mixed using a V-type mixer.

[0106] (6) Magnetic field forming process: A right-angle orientation type magnetic field forming machine was used to form the powder to which zinc stearate was added into a cube having a side length of 25 mm in an orientation magnetic field of 1.6 T at a forming pressure of 0.35 ton / cm 2 . After the first forming, the formed body was demagnetized in a magnetic field of 0.2 T. To prevent the formed body from being exposed to air, the formed body was sealed, and a second forming machine (isostatic pressing machine) was used to perform secondary forming at a pressure of 1.3 ton / cm 2 .

[0107] (7) Sintering process: The formed bodies were moved to a sintering furnace and sintered. Sintering was performed under a vacuum of 5 x 10 -3 Pa, and the temperature was maintained at 300°C and 600°C for 1 hour each, and then sintering was performed at a temperature of 1040°C for 2 hours. After that, Ar gas was introduced to make the gas pressure reach 0.1 MPa, and then the temperature was cooled to room temperature.

[0108] (8) Heat treatment process: after the sintered body is heat treated at a temperature of 500°C for 3 hours in high-purity Ar gas, the sintered body is taken out after cooling to room temperature, to obtain the R-T-B based permanent magnet material.

[0109] The R-T-B based sintered magnet of Example 6 is prepared according to the formulation shown in Table 1 and the preparation process of Example 1, except that:

[0110] The R-T-B based sintered magnet of Example 6 is prepared according to the formulation shown in Table 1 and the preparation process of Example 1, except that:

[0111] After the above step (7) and before step (8), a grain boundary diffusion treatment process is added. The sintered body is processed into a magnet with a diameter of 20 mm and a thickness of 5 mm, with the thickness direction being the magnetic field orientation direction. After surface cleaning, the magnet is coated with a raw material prepared from Tb fluoride, and then dried. The coated magnet is heat treated at a temperature of 850°C for 24 hours in a high-purity Ar gas atmosphere to sputter and adhere Tb element metal on the surface of the magnet.

[0112] Effect Example

[0113] The R-T-B based sintered magnets prepared in Examples 1-6 and Comparative Examples 1-6 are taken respectively to measure their magnetic properties and composition, and FE-EPMA is used to observe the phase composition of the magnets.

[0114] (1) The components of the R-T-B based permanent magnet material are measured using a high-frequency inductively coupled plasma emission spectrometer (ICP-OES), wherein R m (Fe+Co) 1-m-x-y-z (Cu x Ga y Ti z The specific phase composition of the (Fe+Co)-rich phase is obtained according to the FE-EPMA test (EPMA distribution map of Ti in the sintered magnet of Example 3), and the composition detection results are shown in Tables 2 and 3 below. Figure 1

[0115] Table 2 Composition and content (wt%) of R-T-B based permanent magnet material

[0116]

[0117] Note: " / " indicates that the element is not added.

[0118] (2) Magnetic property evaluation: the sintered magnets in Examples 1-6 and Comparative Examples 1-6 are tested for magnetic properties using the NIM-10000H type BH bulk rare earth permanent magnet non-destructive measurement system of the China Institute of Metrology. The magnetic property test results are shown in Table 3 below.

[0119] Table 3 Performance of R-T-B based permanent magnet material​

[0120]

[0121]

[0122] From Table 3, it can be seen that:

[0123] 1) The R-T-B based permanent magnet material of the amorphous grain boundary diffusion product in the present application has excellent performance: Br≥14.50 kGs, Hcj≥15 kOe, and the synchronous improvement of Br and Hcj is realized; and the maximum magnetic energy product is≥50.9 MGOe (Examples 1-5);

[0124] Grain boundary diffusion product: Br≥14.50 kGs, Hcj≥25.5 kOe.

[0125] 2) Based on the formula of the present application, adjusting the range values of Ti / (Cu+Ga) and (Ti+Cu+Ga), even if R and B meet the proportion range of the present application, the magnetic properties of the R-T-B based permanent magnet material and are all decreased (Comparative Examples 1-3);

[0126] 3) Based on the formula of the present application, ensuring that the range values of Ti / (Cu+Ga) and (Ti+Cu+Ga) are within the range defined in the present application, when R and B do not meet the proportion range of the present application, the magnetic properties of the R-T-B based permanent magnet material and are all decreased (Comparative Examples 4-5);

[0127] 4) Based on the formula of the present application, even if the values of Ti / (Cu+Ga), (Ti+Cu+Ga), R and B are adjusted conventionally, the magnetic properties of the R-T-B based permanent magnet material and are all decreased (Comparative Example 6).

Claims

1. An R-T-B based permanent magnet material, characterized by, comprises the following components in terms of weight percentage: R, B, Ti, Cu and Ga; R: 29.0-31.5 wt%; B: 0.87-0.91 wt%; the R is a rare earth element; the R comprises a light rare earth element RL, the RL comprising Nd; the Ti, the Cu and the Ga satisfy the following relationships: (1) 0 the content of the Cu ranges from 0 to 0.15 wt%; wt% refers to the weight percentage in the R-T-B based permanent magnet material; the balance is Fe and Co and inevitable impurities; the R further comprises a heavy rare earth element RH; the content of the RH is 0-1 wt% and not 1 wt%; the Ti / (Cu+Ga) is 0.01-0.5 or 0.003-0.8; The R-T-B based permanent magnet material has a Ti-rich R m (Fe+Co) 1-m-x-y-z (Cu x Ga y Ti z ) enrichment phase, wherein: m 25.5-30 at%, x 0-2 at%, y 1.5-2.5 at%, z 5.5-6.5 at%, at% refers to atomic percentage.

2. The R-T-B based permanent magnet material according to claim 1, wherein and / or, the (Ti+Cu+Ga) is 0.45-0.5; and / or, the m is 25.5-29.6 at%; and / or, the x is 0.5-2 at% or 0-1.7 at%; and / or, the y is 1.5-2.3 at%; and / or, the z is 5.5-5.9 at%. the Ti / (Cu+Ga) is 0.25; 3. The R-T-B based permanent magnet material according to claim 2, wherein and / or, the m is 28.8 at%, 28.9 at%, 29.1 at% or 29.4 at%; and / or, the x is 1.5 at% or 1.6 at%; and / or, the y is 2.4 at%, 1.6 at% or 1.8 at%; and / or, the z is 5.8 at%. the content of the R is 29-31 wt% or 29.5-31.5 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; 4. The R-T-B based permanent magnet material according to claim 1, wherein and / or, the content of the RH is 0.2 wt% or 0.7 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of the B is 0.89-0.905 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of the Ti ranges from 0 to 0.2 wt% and is not 0, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of the Cu ranges from 0.1 wt% or 0.05 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of the Ga ranges from 0.2 to 0.4 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of the Co ranges from 0.5 to 2 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material. the content of the R is 29.7 wt%, 30 wt% or 30.5 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; 5. The R-T-B based permanent magnet material according to claim 4, wherein ​ and / or, the content of B is 0.9 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of Ti ranges from 0.001 wt% to 0.2 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material; and / or, the content of Ga ranges from 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material.

6. The R-T-B based permanent magnet material according to claim 5, wherein The content of Ti ranges from 0.005 wt% or 0.1 wt%, wt% refers to the weight percentage in the R-T-B based permanent magnet material.

7. The RTB-based permanent magnet material according to any one of claims 1 to 6, characterized in that, The R-T-B based permanent magnet material comprises the following components in terms of weight percentage: R 29.0~31.0wt%; RH 0-1wt% and not 1wt%; B 0.87-0.91wt%; Ti 0-0.2wt% and not 0; Cu 0-0.15wt%; Ga 0.2-0.4wt%; Co 0.5-2wt%; wt% refers to the weight percentage of the R-T-B based permanent magnet material, the balance being Fe and inevitable impurities; or, the R-T-B based permanent magnet material comprises the following components in terms of weight percentage: R 29.5~31.5wt%; RH 0-1wt% and not 1wt%; B 0.87-0.91wt%; Ti 0-0.2wt% and not 0; Cu 0-0.15wt%; Ga 0.2-0.4wt%; Co 0.5-2wt%; wt% refers to the weight percentage of the R-T-B based permanent magnet material, the balance being Fe and inevitable impurities.

8. A raw material composition of the R-T-B based permanent magnet material according to any one of claims 1 to 7, characterized by comprising the rare earth element-containing compound and the boron compound. In terms of weight percentage, it comprises the following components: R, B, Ti, Cu and Ga; R: 29.0~31.0wt%; B: 0.87-0.91wt%; The R is a rare earth element, the R comprises a light rare earth element RL, the RL comprises Nd; the Ti, the Cu and the Ga satisfy the following relational expressions: (1) 0 The content of Cu ranges from 0-0.15wt%; The R further comprises a heavy rare earth element RH; the content of RH is 0-1wt% and not 1wt%; wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; The balance is Fe and Co and inevitable impurities. The Ti / (Cu+Ga) is 0.01-0.5 or 0.003-0.8; 9. The raw material composition for R-T-B based permanent magnet according to claim 8, wherein and / or, the (Ti+Cu+Ga) is 0.45-0.5; and / or, the content of R is 29-30.5 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of RH is 0.2 wt% or 0.7wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; ​ and / or, the content of B is 0.89-0.905 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Ti ranges from 0 to 0.2 wt% and is not 0, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Cu ranges from 0.1 wt% or 0.05 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Ga ranges from 0.2-0.4 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Co ranges from 0.5-2 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material.

10. The raw material composition for R-T-B based permanent magnet material according to Claim 9, wherein the Ti / (Cu+Ga) is 0.25; and / or, the content of R is 29.7 wt%, 30 wt% or 30.5 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of B is 0.9 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Ti ranges from 0.001-0.2 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material; and / or, the content of Ga ranges from 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material.

11. The raw material composition for R-T-B based permanent magnet material according to Claim 10, wherein the content of Ti ranges from 0.005 wt% or 0.1 wt%, wt% refers to the weight percentage of the raw material composition of the R-T-B based permanent magnet material.

12. A method for producing an R-T-B based permanent magnet material, characterized by, It comprises the following steps: casting, crushing, pulverizing, shaping, sintering of the molten liquid of the raw material composition of the R-T-B based permanent magnet material as claimed in any one of claims 8-11.

13. The method of producing an R-T-B based permanent magnet material according to claim 12, wherein After the sintering, a grain boundary diffusion treatment is further performed; and / or, after the sintering or after the grain boundary diffusion treatment, a heat treatment is further performed.

14. An R-T-B based permanent magnet material prepared by the preparation method of claim 12 or 13.

15. An application of the R-T-B based permanent magnet material of any one of claims 1-7 and 14 as an electronic component.

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