CN113744986A - Processing method for neodymium iron boron magnet after cutting - Google Patents
Processing method for neodymium iron boron magnet after cutting Download PDFInfo
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- CN113744986A CN113744986A CN202110882592.4A CN202110882592A CN113744986A CN 113744986 A CN113744986 A CN 113744986A CN 202110882592 A CN202110882592 A CN 202110882592A CN 113744986 A CN113744986 A CN 113744986A
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention provides a method for processing a neodymium iron boron magnet after cutting, and relates to the technical field of magnet processing. Cutting a neodymium iron boron magnet into N neodymium iron boron magnets, wherein N is a natural number more than or equal to 2, treating an insulating layer slurry in a pulse magnetic field, spraying the insulating layer slurry on the surfaces of the N-1 cut neodymium iron boron magnets to form insulating layers, sintering and curing for 1.5-3h at the temperature of 800 ℃, spraying the bonding layer slurry on the insulating layers to form bonding layers, then placing the bonding layers on a clamping piece tool for pressurizing and clamping, curing for 1-3h at the temperature of 400 ℃, and naturally cooling to room temperature; according to the invention, the neodymium iron boron magnet is partitioned, the insulating layer slurry is sprayed on the partitioned neodymium iron boron magnet, the purpose of insulation among the neodymium iron boron magnets is realized, the neodymium iron boron magnet is firmly bonded through the adhesive, the eddy current in the neodymium iron boron magnet is further reduced, and meanwhile, the cobalt powder permeates into the neodymium iron boron magnet, so that the coercive force of the neodymium iron boron magnet is effectively improved.
Description
Technical Field
The invention relates to the technical field of magnet processing, in particular to a method for processing a neodymium iron boron magnet after cutting.
Background
Since the advent of neodymium iron boron magnet materials, they have attracted much attention for their excellent physical properties. The neodymium iron boron magnet material has excellent performances of high coercive force, high conductivity, high magnetic energy accumulation and the like, so that the neodymium iron boron magnet material is widely applied to various fields including generators, communication equipment, medical instruments and aerospace. In order to improve the performance of the ndfeb, in the prior art, research on how to improve the coercive force and the like of the ndfeb magnet is mostly carried out, but the problem of the ndfeb magnet material in application is ignored.
Eddy current exists in the neodymium iron boron magnet, and if the eddy current is applied to the motor, along with the improvement of the motor power, the volume of the neodymium iron boron magnet can be enlarged, so that the temperature can be increased, and the neodymium iron boron magnet can be demagnetized under the worst condition, so that the performance of the motor is greatly reduced.
In the prior art, a plurality of sintered neodymium iron boron magnet materials are generally bonded by using a bonding agent, so that the insulating property between the sintered neodymium iron boron is improved, and further, the eddy current is reduced. However, in the scheme in the prior art, the insulation performance among the sintered neodymium iron boron sheets is poor, the bonding effect is poor, the effect of reducing the eddy current of the sintered neodymium iron boron magnet is poor, and the negative effect of reducing the coercive force of the sintered neodymium iron boron magnet can also be caused.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a treatment method after cutting the neodymium iron boron magnet, and the treatment method can not only insulate and firmly bond each neodymium iron boron magnet, but also improve the coercive force of the neodymium iron boron magnet by forming an insulating layer and an adhesive layer on the surface of the neodymium iron boron magnet.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a neodymium iron boron magnet is cut into N neodymium iron boron magnets, wherein N is a natural number more than or equal to 2, insulating layer slurry is sprayed on the surface of the cut N-1 neodymium iron boron magnet after being processed in a pulsed magnetic field, then the sintered and solidified for 1.5 to 3 hours at the temperature of 500 plus one year of design, then the insulating layer slurry is sprayed on the insulating layer and placed on a clamping piece tool for pressing and clamping, the sintered and solidified for 1 to 3 hours at the temperature of 300 plus one year of design is naturally cooled to the room temperature;
the insulating layer slurry is prepared from resin, cobalt powder and solid particles;
the raw materials of the adhesive layer slurry are oligomer and epoxy resin.
Preferably, the mass ratio of the resin to the cobalt powder is (60-80): (1.5-3), wherein the dosage of the solid particles is 2-4% of the total amount of the resin and the cobalt powder.
Preferably, the mass ratio of the epoxy resin to the oligomer is 1: (5-8).
Preferably, the resin is bisphenol A epoxy resin or novolac epoxy resin, the oligomer is petroleum resin, and the epoxy resin is bisphenol A epoxy resin.
Preferably, the petroleum resin is a C5 petroleum resin or a C9 petroleum resin.
Preferably, the voltage of the pulse magnetic field is 200-400V, and the frequency is 10-20 Hz.
Preferably, the solid particles are glass beads or quartz sand.
The inventor of the application provides a processing method after cutting neodymium iron boron magnet, and the purpose of insulation among the neodymium iron boron magnets is achieved by spraying insulating layer coating on the neodymium iron boron magnets, firm bonding of the neodymium iron boron magnets is achieved through bonding agents, and the coercive force of the neodymium iron boron magnets is effectively improved by permeating cobalt powder into the neodymium iron boron magnets.
The inventor of the present application has found that the neodymium iron boron magnet has an eddy current phenomenon in use, and solves this problem by partitioning the neodymium iron boron magnet. After the neodymium iron boron magnet is partitioned, the equivalent resistance is increased, after the neodymium iron boron magnet is divided into N sections, N equivalent resistances are added, and then the eddy current of the magnet is reduced. After the blocks are divided, the neodymium iron boron magnets are ensured to be absolutely insulated and firmly bonded together, and the performance of the magnets is not reduced.
In the research field of the neodymium iron boron magnet, the difference of steps or the difference of raw materials can cause obvious difference to the performance of the neodymium iron boron magnet. In the invention, cobalt powder is added into the insulating layer slurry, which is a technical scheme that is not used in the technical field of reducing the eddy current of the neodymium iron boron magnet. Under the action of the pulse magnetic field, the crystal grains in the insulating layer slurry can be better refined, and the cobalt powder dissolved in the insulating layer slurry can be more uniformly distributed in the insulating layer slurry. And then high-temperature diffusion is carried out at 500-800 ℃, so that the cobalt powder in the coating can better permeate into the neodymium iron boron magnet, the coercive force of the neodymium iron boron magnet is further improved, and the insulating layer can also have a better insulating effect.
In the invention, the adhesive is a mixture of oligomer and epoxy resin, and the mixture of the oligomer and the epoxy resin can achieve a better adhesive effect. The oligomer is a viscous liquid or semisolid, can perform a curing reaction, and can change the substance state from liquid to solid through the reaction of functional groups of the oligomer. When the epoxy resin is mixed with the epoxy resin, solvents such as alcohols and acetone are not needed for dissolving, so that the discharge of organic pollutants is reduced, and the environment is protected.
Compared with the prior art, the invention has the following beneficial effects:
cutting and blocking the neodymium iron boron magnet, spraying insulating layer slurry in the blocked neodymium iron boron magnet, wherein solid particles in the insulating layer slurry have a good insulating effect, and cobalt powder in the insulating layer slurry can permeate into crystal lattices of the neodymium iron boron magnet at high temperature, so that the coercive force of the bonded neodymium iron boron magnet is obviously improved. The use of the oligomer and the epoxy resin can play a good role in bonding, reduce the pollution to the environment and protect the environment. Through with the neodymium iron boron magnetism body blocking, then carry out insulating bonding between the neodymium iron boron magnetism body, can reduce the vortex that produces in the neodymium iron boron use.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
A neodymium iron boron magnet is cut into N neodymium iron boron magnets, N is a natural number larger than or equal to 2, insulating layer slurry is processed in a pulse magnetic field and then sprayed on the surface of the cut N-1 neodymium iron boron magnet to form an insulating layer, the insulating layer is sintered and solidified for 1.5 to 3 hours at the temperature of 500 plus materials and 800 ℃, then the bonding layer slurry is sprayed on the insulating layer to form a bonding layer, then the bonding layer slurry is placed on a clamping piece tool for pressurization and clamping, the bonding layer slurry is solidified for 1 to 3 hours at the temperature of 300 plus materials and 400 ℃, and the bonding layer slurry is naturally cooled to room temperature;
the insulating layer slurry is prepared from resin, cobalt powder and solid particles;
the raw materials of the adhesive layer slurry are oligomer and epoxy resin.
In the invention, a neodymium iron boron magnet is selected, and the selected neodymium iron boron magnet is provided by Dongyang magnet factory with the brand number of N35. And cutting the neodymium-iron-boron magnet into N pieces, wherein N is more than or equal to 2. And carrying out pretreatment on the cut neodymium iron boron magnet, wherein the pretreatment comprises conventional operations such as cleaning, ultrasonic treatment and the like, and then carrying out various operations such as spraying and the like.
In the invention, the mass ratio of the resin to the cobalt powder is (60-80): (1.5-3), wherein the dosage of the solid particles is 2-4% of the total amount of the resin and the cobalt powder. In the embodiment of the invention, the mass ratio of the used resin to the cobalt powder is 60:1.5, 65:2 or 70:2.5, and the dosage of the solid particles is 2.5 percent or 3 percent of the total amount of the resin and the cobalt powder.
In the invention, the mass ratio of the epoxy resin to the oligomer is 1: (5-8), in the embodiment of the invention, the mass ratio of the epoxy resin to the oligomer is 1:5, 1:6 or 1: 7.5.
In the invention, the resin is bisphenol A epoxy resin or novolac epoxy resin, the oligomer is C5 petroleum resin or C9 petroleum resin, and the epoxy resin is bisphenol A epoxy resin. In the examples of the present invention, the resin used was epoxy resin E44 or novolac epoxy resin F51, the oligomer used was C5 petroleum resin or C9 petroleum resin, and the epoxy resin used was epoxy resin E44.
In the invention, the voltage of the pulse magnetic field is 200-400V, and the frequency is 10-20Hz, in the embodiment of the invention, the voltage is 200V or 400V, and the frequency is 10 Hz.
In the invention, the solid particles are glass beads or quartz sand. The particle size of the glass beads is 25 μm in the examples, and the mesh size of the silica sand is 100 mesh.
In the following examples, cobalt powder was supplied from Aladdin reagent, Inc., epoxy resin E44 was supplied from Nantong star synthetic materials, Inc., Novolac epoxy F51 was supplied from Shandong de-sourced epoxy, Inc., and C5 petroleum resin and C9 petroleum resin were supplied from Ronda resin, Inc., of Nanjing City.
Example 1
Cutting the neodymium iron boron magnet into 3 neodymium iron boron magnets, and then preparing insulating layer slurry: mixing epoxy resin E44 and cobalt powder in a mass ratio of 60:1.5, adding glass beads, wherein the adding amount of the glass beads is 2.5% of the total amount of the epoxy resin E44 and the cobalt powder, and preparing the slurry. Treating the insulating layer slurry in a pulsed magnetic field with the voltage of 200V and the frequency of 10Hz for 60 min. And spraying the treated insulating layer slurry on the upper surfaces of the 1 st and 2 nd neodymium iron boron magnets to form insulating layers, and sintering and curing for 2h at 600 ℃.
Then preparing adhesive layer slurry: mixing C5 petroleum resin and epoxy resin E44 in a mass ratio of 5: 1 and mixing. Spraying the prepared bonding layer slurry on the 1 st and the 2 nd neodymium iron boron magnet insulating layers to form a bonding layer, then combining the magnet surface coated with the insulating layer and the bonding layer on the 1 st block with the non-sprayed surface of the 2 nd block, combining the non-sprayed surface of the 3 rd block with the bonding layer sprayed in the 2 nd block, placing the blocks on a clamping piece tool for pressurizing and clamping, curing at 300 ℃ for 2h, and naturally cooling to room temperature.
Example 2
Cutting the neodymium iron boron magnet into 3 neodymium iron boron magnets, and then preparing insulating layer slurry: mixing novolac epoxy resin F51 and cobalt powder in a mass ratio of 65:2, adding quartz sand, wherein the adding amount of the quartz sand is 3% of the total amount of novolac epoxy resin F51 and cobalt powder, and preparing the slurry. Treating the insulating layer slurry in a pulsed magnetic field with the voltage of 400V and the frequency of 10Hz for 60 min. And spraying the treated insulating layer slurry on the surfaces of the 1 st and 2 nd neodymium iron boron magnets to form insulating layers, and sintering and curing for 3h at 600 ℃.
Then preparing adhesive layer slurry: mixing C9 petroleum resin and epoxy resin E44 in a mass ratio of 6: 1 and mixing. Spraying the prepared bonding layer slurry on the 1 st and the 2 nd neodymium iron boron magnet insulating layers to form a bonding layer, then combining the magnet surface coated with the insulating layer and the bonding layer on the 1 st block with the non-sprayed surface of the 2 nd block, combining the non-sprayed surface of the 3 rd block with the bonding layer sprayed in the 2 nd block, placing the blocks on a clamping piece tool for pressurizing and clamping, curing at 300 ℃ for 2h, and naturally cooling to room temperature.
Example 3
The operation process of this example is substantially the same as that of example 1, except that the mass ratio of the epoxy resin E44 to the cobalt powder is 70:2.5, and the mass ratio of the C5 petroleum resin to the epoxy resin E44 is 7.5: 1, mixing and the rest operation process is the same.
Comparative example 1
In reference to example 1, this comparative example was conducted in the same manner without adding glass beads.
Comparative example 2
Referring to example 2, the comparative example was conducted in the same manner without adding cobalt powder.
Comparative example 3
This comparative example is referred to example 3, except that the epoxy resin E44 in "mixing the epoxy resin E44 and cobalt powder at a mass ratio of 60: 1.5" was changed to a polyurethane resin, which had an average molecular weight of 2000.
The bonded neodymium-iron-boron magnets obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to resistance value measurement and coercive force measurement, and the results obtained are shown in tables 1 and 2.
TABLE 1 results of measuring resistance values of examples 1 to 3 and comparative examples 1 to 3
Note: the resistance in table 1 refers to the resistance of the insulating layer and the adhesive layer sprayed between two adjacent ndfeb magnets.
TABLE 2 results of coercive force measurement of examples 1 to 3 and comparative examples 1 to 3
| Group of | Coercive force (KOe) |
| Commercial brand N35 | 11.95 |
| Example 1 | 15.62 |
| Example 2 | 16.23 |
| Example 3 | 16.25 |
| Comparative example 1 | 15.63 |
| Comparative example 2 | 11.86 |
| Comparative example 3 | 16.22 |
As can be seen from the data in tables 1 and 2, after the neodymium iron boron magnet which is cut and partitioned is processed by the technical scheme of the invention, the bonded neodymium iron boron magnet has good insulating property, and the coercive force is improved. The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for processing neodymium iron boron magnet after cutting is characterized in that the neodymium iron boron magnet is cut into N neodymium iron boron magnets, N is a natural number which is more than or equal to 2, insulating layer slurry is processed in a pulse magnetic field and then sprayed on the surfaces of the N-1 cut neodymium iron boron magnets to form insulating layers, the insulating layers are sintered and solidified for 1.5 to 3 hours at the temperature of 500-;
the insulating layer slurry is prepared from resin, cobalt powder and solid particles;
the raw materials of the adhesive layer slurry are oligomer and epoxy resin.
2. The processing method after the neodymium iron boron magnet is cut according to claim 1, wherein the mass ratio of the resin to the cobalt powder is (60-80): (1.5-3), wherein the dosage of the solid particles is 2-4% of the total amount of the resin and the cobalt powder.
3. The method for processing the neodymium-iron-boron magnet after being cut according to claim 1, wherein the mass ratio of the epoxy resin to the oligomer is 1: (5-8).
4. The method for processing the neodymium-iron-boron magnet after being cut according to claim 1, wherein the resin is bisphenol A epoxy resin or novolac epoxy resin, the oligomer is petroleum resin, and the epoxy resin is bisphenol A type epoxy resin.
5. The method for processing neodymium iron boron magnet after being cut according to claim 4, wherein the petroleum resin is C5 petroleum resin or C9 petroleum resin.
6. The processing method after cutting the NdFeB magnet as claimed in claim 1, wherein the voltage of the pulse magnetic field is 200-400V, and the frequency is 10-20 Hz.
7. The method for processing neodymium-iron-boron magnet after being cut according to claim 1, wherein the solid particles are glass beads or quartz sand.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110882592.4A CN113744986B (en) | 2021-08-02 | 2021-08-02 | Treatment method for cut neodymium-iron-boron magnet |
| PCT/CN2022/109686 WO2023011464A1 (en) | 2021-08-02 | 2022-08-02 | Post-cutting treatment method for neodymium magnet |
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| CN202110882592.4A CN113744986B (en) | 2021-08-02 | 2021-08-02 | Treatment method for cut neodymium-iron-boron magnet |
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| CN113744986A true CN113744986A (en) | 2021-12-03 |
| CN113744986B CN113744986B (en) | 2023-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023011464A1 (en) * | 2021-08-02 | 2023-02-09 | 安徽省瀚海新材料股份有限公司 | Post-cutting treatment method for neodymium magnet |
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| WO2023011464A1 (en) * | 2021-08-02 | 2023-02-09 | 安徽省瀚海新材料股份有限公司 | Post-cutting treatment method for neodymium magnet |
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| WO2023011464A1 (en) | 2023-02-09 |
| CN113744986B (en) | 2023-09-22 |
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