CN117410091A - Grain boundary diffusion process of neodymium-iron-boron magnet - Google Patents
Grain boundary diffusion process of neodymium-iron-boron magnet Download PDFInfo
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- CN117410091A CN117410091A CN202311493633.6A CN202311493633A CN117410091A CN 117410091 A CN117410091 A CN 117410091A CN 202311493633 A CN202311493633 A CN 202311493633A CN 117410091 A CN117410091 A CN 117410091A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 37
- 238000005324 grain boundary diffusion Methods 0.000 title claims abstract description 22
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 44
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000009792 diffusion process Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 229910052786 argon Inorganic materials 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 238000011049 filling Methods 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000004321 preservation Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000000151 deposition Methods 0.000 claims abstract description 3
- 238000005496 tempering Methods 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 14
- 239000001301 oxygen Substances 0.000 abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000006255 coating slurry Substances 0.000 abstract description 3
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 229910002090 carbon oxide Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- -1 rare earth carbon oxides Chemical class 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 3
- 230000004584 weight gain Effects 0.000 description 3
- 235000019786 weight gain Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000005007 epoxy-phenolic resin Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 235000020985 whole grains Nutrition 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a grain boundary diffusion process of a neodymium-iron-boron magnet, which relates to the technical field of sintered neodymium-iron-boron magnetic materials and aims to reduce the carbon and oxygen content of the surface of a diffused sample by a simple method; the invention is based on the traditional heavy rare earth coating and drying method, which comprises the steps of coating slurry containing heavy rare earth on the surface of a neodymium iron boron blank, placing the coating surface upwards for vibration treatment, depositing heavy rare earth powder with the maximum density in the slurry material on the surface of the neodymium iron boron blank, drying after vibration, continuing the vacuum heating diffusion process, and optionally comprising at least one argon filling, heat preservation, pressure maintaining and vacuumizing process in the heating process of the vacuum heating diffusion process; the process scheme of the invention is simple and easy to operate, is beneficial to reducing the carbon and oxygen content of the surface of the sample, improves the coercive force of the sample relative to the traditional process, and is indirectly beneficial to reducing the consumption of heavy rare earth.
Description
Technical Field
The invention relates to the technical field of sintered NdFeB magnetic materials, in particular to a grain boundary diffusion process of an NdFeB magnetic body.
Background
The rare earth permanent magnet sintered NdFeB has very wide application in industrial production, daily life and the like, and along with the proposal of energy conservation and emission reduction and double carbon strategy, the performance requirements of various industries on the NdFeB are higher and higher. Along with the introduction of the grain boundary diffusion technology, the dosage of the neodymium iron boron heavy rare earth is greatly reduced compared with that of the conventional production process. However, in the current coating process, heavy rare earth carbon oxides are easily generated on the surface and near surface of the product subjected to grain boundary diffusion, the heavy rare earth carbon oxides have a high melting point and are relatively stable, and are difficult to diffuse into the magnet, so that one material in the diffusion process is wasted, and carbon elements enter the magnet in the diffusion process, so that the product performance is reduced. How to reduce the generation of the carbon oxide, ensure the improvement range of the product performance and further reduce the dosage of heavy rare earth is one of the directions of the current research.
According to the invention, through researching the front and rear processes of grain boundary diffusion production, in the whole grain boundary diffusion process, in order to increase the binding force between the heavy rare earth and the surface of the magnet, one or more organic resin binders are often added, the organic binders are insufficiently volatilized in the heating process of grain boundary diffusion, and residual carbon and oxygen are combined with the heavy rare earth in the subsequent heating and heat preservation processes to cause more generation of final heavy rare earth carbon oxides, so that the diffusion process is hindered to cause performance loss and waste of the heavy rare earth.
In the patent of the invention, the publication number is CN109887696B, which is named as an organic slurry coated on the neodymium-iron-boron magnet and the preparation of the high-coercivity neodymium-iron-boron magnet, a special slurry is disclosed, wherein the used thermoplastic resin powder has good adhesion effect, the decomposition temperature is low, the curing time is short, the oxygen and carbon content entering the magnet can be reduced, but the special slurry is required, the method universality is low, and one or more means are still insufficient, which is unfavorable for the development of the process technology, so that the grain boundary diffusion process of the neodymium-iron-boron magnet is needed.
Disclosure of Invention
The invention aims to provide a grain boundary diffusion process of a neodymium iron boron magnet, which is used for reducing the carbon and oxygen content of the surface of a diffused sample by a simple method.
In order to achieve the above purpose, the present invention provides the following technical solutions: the grain boundary diffusion process of the neodymium-iron-boron magnet comprises the following specific contents: and (3) coating the slurry containing the heavy rare earth on the surface of the neodymium iron boron blank, placing the coating surface upwards for vibration treatment, depositing heavy rare earth powder with the maximum density in the slurry material on the surface of the neodymium iron boron blank, drying after vibration, and continuing the vacuum heating diffusion process.
Preferably, the vibration treatment is carried out on a high-frequency vibration platform, the frequency is 30-120 Hz, and the time is 1-5 min.
Preferably, the vacuum heating diffusion process further comprises at least one argon filling, heat preservation, pressure maintaining and vacuumizing process in the heating process.
Preferably, the vacuum heating diffusion process includes: and (3) performing diffusion treatment at 750-950 ℃ for 10-15h by using a tubular vacuum sintering furnace, wherein argon filling, heat preservation, pressure maintaining and vacuumizing processes are performed at 400-500 ℃ and 750-850 ℃ respectively, and tempering is performed at 465-530 ℃ for 3-6 h after the diffusion treatment time is finished.
More preferably, the vacuum heating diffusion process comprises the following steps: and (3) carrying out diffusion treatment at 910 ℃ for 12 hours by using a tubular vacuum sintering furnace, increasing the heating rate to 4 ℃/min, adding argon filling, heat preservation, pressure maintaining and vacuumizing processes once when the temperature is increased to 450 ℃ and 800 ℃, and tempering by adopting a system at 510 ℃ for 4 hours.
Preferably, the pressure of the argon filling is 0.01-0.06 MPa, and the heat preservation and pressure maintaining time is 5-20 min.
Optionally, the slurry containing heavy rare earth comprises 50-80 wt.% of rare earth or rare earth alloy, 1.5-5 wt.% of organic resin binder and the balance of solvent.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the grain boundary diffusion process of the neodymium-iron-boron magnet, a simple process scheme of adding vibration treatment after coating is adopted, so that heavy rare earth powder with high density in slurry is deposited on the surface of a neodymium-iron-boron blank, and therefore an organic adhesive is more suspended on the upper layer of a coating film, is relatively easier to volatilize, and is beneficial to reducing the carbon and oxygen content on the surface of a sample.
2. The grain boundary diffusion process of the neodymium-iron-boron magnet can also adopt the processes of argon filling, heat preservation, pressure maintaining and vacuumizing for one or more times in the process of heating up by the vacuum heating diffusion process; the argon filling can dilute the atmosphere containing carbon and oxygen in the furnace, and then the atmosphere is vacuumized to take away a large amount of the carbon-containing oxygen, so that the volatilization of the organic adhesive is further accelerated, and the reduction of the generation of the heavy rare earth carbon oxides is facilitated.
3. The grain boundary diffusion process of the neodymium-iron-boron magnet is simple in process scheme and easy to operate, the steps can be directly added on the basis of the original scheme, and the carbon and oxygen content of the surface of a sample can be directly reflected on the guarantee of product performance, the coercive force of the neodymium-iron-boron magnet is indirectly improved relative to that of the traditional process, and the reduction of the heavy rare earth consumption is facilitated by adopting the method under the condition of guaranteeing the equivalent performance.
Detailed Description
The grain boundary diffusion process of the neodymium-iron-boron magnet is based on a traditional heavy rare earth coating drying method and comprises the following specific contents:
after coating heavy rare earth-containing slurry on the surface of the neodymium iron boron blank, placing the coating surface upwards for vibration treatment, wherein the common heavy rare earth-containing slurry for reference generally comprises 50-80 wt.% (one or more of Tb, dy, ho, pr, nd, cu, al, ga, co, fe and the like can be contained therein) of rare earth or rare earth alloy, 1.5-5 wt.%) of organic resin binder and the balance of solvent (usually 19-48.5 wt.%), wherein the organic resin binder can be epoxy resin, phenolic resin and the like, the heavy rare earth powder can be deposited on the surface of the neodymium iron boron blank due to higher density of the heavy rare earth powder by vibration, the heavy rare earth is more deposited on the lower layer of the coating film after vibration, the organic binder is more suspended on the upper layer of the coating film and is relatively easier to volatilize, and the vacuum heating diffusion process is continued after vibration.
In a preferred embodiment, the vibration treatment is performed on a high-frequency vibration platform, the frequency can be 30-120 Hz, and the vibration time is set to be 1-5 min.
In addition, besides vibration treatment, argon filling, heat preservation, pressure maintaining and vacuumizing processes can be carried out for one time or multiple times in the process of heating up by a vacuum heating diffusion process; the argon filling can dilute the atmosphere containing carbon and oxygen in the furnace, and then the atmosphere is vacuumized to take away a large amount of the carbon-containing oxygen, so that the volatilization of the organic adhesive is further accelerated, the generation of heavy rare earth carbon oxides is reduced, the product performance is ensured, and the indirect heavy rare earth consumption is reduced; further alternatively, the argon filling pressure can be 0.01-0.06 MPa, and the heat preservation and pressure maintaining time is controlled to be 5-20 min.
For reference, the vacuum heating diffusion process may include: and (3) performing diffusion treatment at 750-950 ℃ for 10-15h by using a tubular vacuum sintering furnace, wherein argon filling, heat preservation, pressure maintaining and vacuumizing processes are performed once at 400-500 ℃ and 750-850 ℃ respectively, and tempering is performed at 465-530 ℃ for 3-6 h after the diffusion treatment time is finished.
The vacuum heating diffusion process can further adopt the following preferable scheme: and (3) carrying out diffusion treatment at 910 ℃ for 12 hours by using a tubular vacuum sintering furnace, increasing the heating rate to 4 ℃/min, adding argon filling, heat preservation, pressure maintaining and vacuumizing processes once when the temperature is increased to 450 ℃ and 800 ℃, and tempering by adopting a system at 510 ℃ for 4 hours.
The following comparative examples, which are only made to compare the effects of the present invention, are not intended to limit the scope of the parameters of this example, but rather should be construed according to the principles of the present invention and are intended to be protected by the scope of the claims, as specific parameters such as temperature, time, slurry materials, etc. should be understood from the standpoint of knowledge of those skilled in the art, provided that they follow the teachings of the present invention.
For example, the above slurry containing heavy rare earth, while only the references to the heavy rare earth and/or heavy rare earth alloy, and the organic resin binder and solvent are described in the present invention, the present invention is not limited to this range, and particularly the organic resin binder, and other alternative materials that can provide similar effects can be used in the method of the present invention, and the method of the present invention should be considered as being within the scope of the present invention, as long as the method does not interfere with the present invention (particularly, vibration can cause heavy rare earth with a higher density to settle), even if the slurry type is not yet present at the time of application, and the present material in the future development process can also be applied.
Comparative example: selecting a 45H brand NdFeB blank, grinding and slicing the blank into square samples with the dimensions of 25mm 6mm, and sampling and testing the carbon content, the oxygen content and the performance of the matrix. Sample numbers A01 to A10 are taken, wherein, slurries containing heavy rare earth Tb (Tb accounting for 70 percent, solvent 27 percent and organic resin 3 percent) are coated on the surfaces of A01 to A08, the coated materials are taken out and dried by an oven, the weight gain of Tb is calculated and recorded, and A09 and A10 are not coated. Taking A01 and A02 to test and record the surface binding force of the samples A03 to A10, boxing the samples A03 to A10, carrying out 910 ℃ x 12h diffusion treatment by using a tubular vacuum sintering furnace, tempering the samples A03 to A10 by adopting a 510 ℃ x 4h system, and collecting all the test data of the substrate and the samples A1 to A10 to obtain the product:
table 1: comparative example sample test results
As can be seen from table 1 above, the surface carbon and oxygen content of the sample increases significantly after coating and diffusion.
Example 1: selecting 45H brand NdFeB blanks, grinding and slicing the blanks to obtain a plurality of square samples with the size of 25mm x 6mm, coating slurries containing heavy rare earth Tb similar to that of the comparative examples on the surfaces of the samples B01-B12, placing the B07-B12 on a high-frequency vibration platform after coating, setting the frequency to be 60Hz, vibrating for 2min, drying the B01-B12 by using an oven at the same time, weighing and recording Tb weight gain, taking the B01, B02, B07 and B08 to test the surface binding force and recording, placing the rest samples in a material box for tidy arrangement, using a tubular vacuum sintering furnace for 910 ℃ x 12H diffusion treatment, tempering the samples by adopting a 510 ℃ x 4H system, testing the magnetic property and the surface carbon oxygen content of the diffusion materials after diffusion, and summarizing all test data into the table 2 to obtain the following products:
table 2: example 1 sample test results
As can be seen from the comparison of the data in Table 2, the bonding force of the coating layers of the samples (B07-B12) which are vibrated and dried after being coated is not obviously changed, but the carbon-oxygen content of the surface layer after being diffused is obviously reduced, and the coercivity is obviously improved.
Example 2: selecting a 45H brand NdFeB blank, grinding and slicing the blank to obtain a plurality of square samples with the size of 25mm 6mm, coating slurry containing heavy rare earth Tb, which is the same as that of the comparative example, on the surface of the C01-C15, placing the C07-C15 on a high-frequency vibration platform after coating, setting the frequency to be 60Hz, vibrating for 2min, drying the C01-C15 by a baking oven at the same time, weighing and recording Tb weight increment, placing the C01, C02, C03, C07, C08 and C09 samples in a material box for tidy arrangement, and using a tubular vacuum sintering furnace for carrying out 910 ℃ x 12H diffusion treatment; placing C04, C05, C06 and C010-C15 samples in a material box to be orderly placed, carrying out diffusion treatment at 910 ℃ for 12 hours by using a tubular vacuum sintering furnace, respectively increasing argon filling process to 0.03MPa when the temperature is raised to 450 ℃ and 800 ℃, maintaining the pressure for 10 minutes, vacuumizing and heating after the pressure maintaining is finished, carrying out diffusion treatment at 910 ℃ for 12 hours, simultaneously tempering C01-C15, tempering the tempering to be in a system of 510 ℃ for 4 hours, testing the magnetic properties and the surface carbon oxygen content of all samples after the diffusion is finished, and summarizing all test data into the following table 3 to obtain the following components:
table 3: example 2 sample test results
As can be seen from the comparison of the data in Table 3, compared with the traditional processes (C01, C02 and C03), only the vibration (C07, C08 and C09) and only the argon filling and pressure maintaining processes (C04, C05 and C06) can be increased, the carbon and oxygen content of the surface of the sample can be effectively reduced, the product performance is greatly improved, the performance improvement amplitude is higher, and after the weight gain is reduced (C13, C14 and C15), the performance is still not lower than that of the traditional processes, and the heavy rare earth usage amount is saved.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention should be defined by the claims.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (7)
1. The grain boundary diffusion process of the neodymium-iron-boron magnet is characterized by comprising the following specific contents: and (3) coating the slurry containing the heavy rare earth on the surface of the neodymium iron boron blank, placing the coating surface upwards for vibration treatment, depositing heavy rare earth powder with the maximum density in the slurry material on the surface of the neodymium iron boron blank, drying after vibration, and continuing the vacuum heating diffusion process.
2. The process for grain boundary diffusion of a neodymium-iron-boron magnet according to claim 1, wherein: the vibration treatment is carried out on a high-frequency vibration platform, the frequency is 30-120 Hz, and the time is 1-5 min.
3. The process for grain boundary diffusion of a neodymium-iron-boron magnet according to claim 1, wherein: the vacuum heating diffusion process further comprises at least one argon filling, heat preservation, pressure maintaining and vacuumizing process in the heating process.
4. A grain boundary diffusion process for a neodymium-iron-boron magnet according to claim 3, wherein said vacuum heating diffusion process comprises: and (3) performing diffusion treatment at 750-950 ℃ for 10-15h by using a tubular vacuum sintering furnace, wherein argon filling, heat preservation, pressure maintaining and vacuumizing processes are performed at 400-500 ℃ and 750-850 ℃ respectively, and tempering is performed at 465-530 ℃ for 3-6 h after the diffusion treatment time is finished.
5. The process of claim 4, wherein the vacuum heating diffusion process is: and (3) carrying out diffusion treatment at 910 ℃ for 12 hours by using a tubular vacuum sintering furnace, increasing the heating rate to 4 ℃/min, adding argon filling, heat preservation, pressure maintaining and vacuumizing processes once when the temperature is increased to 450 ℃ and 800 ℃, and tempering by adopting a system at 510 ℃ for 4 hours.
6. A grain boundary diffusion process for a neodymium-iron-boron magnet according to any one of claims 3 to 5, characterized in that: the pressure of the argon filling is 0.01-0.06 MPa, and the heat preservation and pressure maintaining time is 5-20 min.
7. The process for grain boundary diffusion of a neodymium-iron-boron magnet according to claim 1, wherein: the heavy rare earth-containing slurry comprises 50-80 wt.% of rare earth or rare earth alloy, 1.5-5 wt.% of organic resin binder and the balance of solvent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311493633.6A CN117410091A (en) | 2023-11-10 | 2023-11-10 | Grain boundary diffusion process of neodymium-iron-boron magnet |
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