CN113744986B - Treatment method for cut neodymium-iron-boron magnet - Google Patents
Treatment method for cut neodymium-iron-boron magnet Download PDFInfo
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- CN113744986B CN113744986B CN202110882592.4A CN202110882592A CN113744986B CN 113744986 B CN113744986 B CN 113744986B CN 202110882592 A CN202110882592 A CN 202110882592A CN 113744986 B CN113744986 B CN 113744986B
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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
-
- 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
-
- 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
Abstract
The application provides a processing method for 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 greater than or equal to 2, treating insulating layer slurry in a pulse magnetic field, spraying the insulating layer slurry on the surfaces of the N-1 neodymium iron boron magnets cut into insulating layers, sintering and curing at 500-800 ℃ for 1.5-3 hours, spraying bonding layer slurry on the insulating layers to form bonding layers, placing the bonding layers on a clamping piece tool for pressing and clamping, curing at 300-400 ℃ for 1-3 hours, and naturally cooling to room temperature; according to the application, the neodymium-iron-boron magnets are segmented, and the insulating layer slurry is sprayed on the segmented neodymium-iron-boron magnets, so that the purpose of insulation among the neodymium-iron-boron magnets is realized, the firm bonding of the neodymium-iron-boron magnets is realized through the adhesive, the eddy current in the neodymium-iron-boron magnets is reduced, and meanwhile, the coercive force of the neodymium-iron-boron magnets is effectively improved through the penetration of cobalt powder into the neodymium-iron-boron magnets.
Description
Technical Field
The application relates to the technical field of magnet processing, in particular to a processing method for a neodymium-iron-boron magnet after cutting.
Background
Neodymium iron boron magnet materials have been widely focused on due to their excellent physical properties since the advent of the prior art. Neodymium-iron-boron magnet materials are widely applied to various large fields, including generators, communication equipment, medical equipment and aerospace, due to the excellent performances of high coercivity, high conductivity, high magnetic energy and the like. In order to improve performance of the neodymium-iron-boron, in the prior art, how to improve coercive force of the neodymium-iron-boron magnet is mostly studied, but problems of the neodymium-iron-boron magnet material in application are ignored.
Eddy currents exist in the neodymium-iron-boron magnet, if the neodymium-iron-boron magnet is applied to a motor, the volume of the neodymium-iron-boron magnet can be increased along with the increase of motor power, the temperature rise can be further caused, and in the worst case, the neodymium-iron-boron magnet material can be demagnetized, so that the performance of the motor is greatly reduced.
In the prior art, a plurality of sintered neodymium-iron-boron magnet materials are bonded by adopting an adhesive, so that the insulating property between the sintered neodymium-iron-boron magnets is improved, and the eddy current is reduced. However, in the scheme in the prior art, the insulation performance among a plurality of sintered neodymium-iron-boron magnets is poor, the bonding effect is poor, the effect of reducing the eddy current of the sintered neodymium-iron-boron magnets is poor, and the negative effect of reducing the coercive force of the neodymium-iron-boron magnets can be caused.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a processing method after cutting of the neodymium-iron-boron magnet, and the insulation layer and the bonding layer are formed on the surface of the neodymium-iron-boron magnet, so that the insulation and firm bonding of the neodymium-iron-boron magnets can be realized, and the coercive force of the neodymium-iron-boron magnet can be improved.
In order to achieve the above purpose, the present application is realized by the following technical scheme:
cutting a neodymium-iron-boron magnet into N neodymium-iron-boron magnets, wherein N is a natural number greater than or equal to 2, treating insulating layer slurry in a pulse magnetic field, spraying the insulating layer slurry on the surface of the N-1 neodymium-iron-boron magnets cut, sintering and curing at 500-800 ℃ for 1.5-3 hours, spraying adhesive layer slurry on the insulating layer, placing the insulating layer on a clamping piece tool for pressurizing and clamping, curing at 300-400 ℃ for 1-3 hours, and naturally cooling 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.
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 phenolic 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 10-20Hz.
Preferably, the solid particles are glass beads or quartz sand.
The inventor provides a processing method after cutting of neodymium-iron-boron magnets, the purpose of insulation among the neodymium-iron-boron magnets is achieved by spraying insulating layer paint on the neodymium-iron-boron magnets, firm bonding of the neodymium-iron-boron magnets is achieved through an adhesive, cobalt powder is permeated into the neodymium-iron-boron magnets, and coercivity of the neodymium-iron-boron magnets is effectively improved.
The inventors have found that there is an eddy current phenomenon in use of the neodymium-iron-boron magnet and this problem is solved by blocking the neodymium-iron-boron magnet. After the neodymium-iron-boron magnet is segmented, the equivalent resistance is increased, and after the neodymium-iron-boron magnet is segmented into N sections, N equivalent resistances are increased, so that the reduction of the eddy current of the magnet is realized. However, after the blocking, the insulation effect between the NdFeB magnets is absolutely realized, and meanwhile, the NdFeB magnets are firmly bonded together, so that the performance of the magnets is not reduced.
In the research field of the NdFeB magnet, obvious differences can be caused to the performance of the NdFeB magnet by the difference of steps or the difference of raw materials. In the application, cobalt powder is added into the insulating layer slurry, which is a technical scheme which is not used in the technical field of reducing the eddy current of the NdFeB magnet. Under the action of the pulse magnetic field, crystal grains in the insulating layer slurry can be better refined, and cobalt powder dissolved in the insulating layer slurry can be more uniformly distributed in the crystal grains. Then high-temperature diffusion is carried out at 500-800 ℃, so that cobalt powder in the coating can be well infiltrated into the neodymium-iron-boron magnet, the coercive force of the neodymium-iron-boron magnet is further improved, and the insulating layer can have a better insulating effect.
In the application, the adhesive is a mixture of the oligomer and the epoxy resin, and the two substances are mixed to achieve better adhesive effect. The oligomer is a viscous liquid or semisolid, can undergo a curing reaction, and can change a substance state from a liquid to a solid through a reaction of its functional groups. When the epoxy resin is mixed with epoxy resin, solvents such as alcohols, acetone and the like are not required to be used for dissolution, so that the discharge of organic pollutants is reduced, and the environment is protected.
Compared with the prior art, the application has the following beneficial effects:
cutting the neodymium-iron-boron magnet into blocks, 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 lattices of the neodymium-iron-boron magnet after passing through high temperature, so that the coercive force of the bonded neodymium-iron-boron magnet is remarkably improved. The use of the oligomer and the epoxy resin can play a good role in adhesion, reduce environmental pollution and protect the environment. Through blocking the neodymium-iron-boron magnets, then insulating bonding is carried out between the neodymium-iron-boron magnets, and eddy currents generated in the using process of the neodymium-iron-boron can be reduced.
Additional features and advantages of the application will be set forth in the detailed description which follows.
Detailed Description
The application is further described in the following with reference to specific embodiments in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the application easy to understand.
Cutting a neodymium-iron-boron magnet into N neodymium-iron-boron magnets, wherein N is a natural number greater than or equal to 2, treating insulating layer slurry in a pulse magnetic field, spraying the insulating layer slurry on the surface of the N-1 neodymium-iron-boron magnets cut into insulating layers, sintering and curing at 500-800 ℃ for 1.5-3 hours, spraying adhesive layer slurry on the insulating layers to form adhesive layers, placing the adhesive layers on a clamping piece tool for pressing and clamping, curing at 300-400 ℃ for 1-3 hours, and naturally cooling 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 application, a neodymium-iron-boron magnet is selected, and the selected neodymium-iron-boron magnet is provided by a Dongyang magnet factory and has the brand number of N35. Cutting the NdFeB magnet into N pieces, wherein N is more than or equal to 2. The cut NdFeB magnet is subjected to pretreatment, which comprises conventional operations such as cleaning, ultrasonic treatment and the like, and then is subjected to various operations such as spraying and the like.
In the application, 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 application, the mass ratio of the 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% or 3% of the total amount of the resin and the cobalt powder.
In the application, the mass ratio of the epoxy resin to the oligomer is 1: (5-8) in the embodiment of the application, the mass ratio of the epoxy resin to the oligomer is 1:5, 1:6 or 1:7.5.
In the application, the resin is bisphenol A epoxy resin or phenolic epoxy resin, the oligomer is C5 petroleum resin or C9 petroleum resin, and the epoxy resin is bisphenol A epoxy resin. In the embodiment of the application, the resin is epoxy resin E44 or phenolic epoxy resin F51, the oligomer is C5 petroleum resin or C9 petroleum resin, and the epoxy resin is epoxy resin E44.
In the embodiment of the application, the voltage of the pulse magnetic field is 200-400V and the frequency is 10-20Hz, and in the embodiment of the application, the voltage is 200V or 400V and the frequency is 10Hz.
In the application, the solid particles are glass beads or quartz sand. The particle size of the glass beads was 25 μm in the examples, and the mesh size of the quartz sand was 100mesh.
In the following examples, cobalt powder was supplied by the company Ara Ding Shiji, epoxy E44 was supplied by the company Nantong star composite, inc., phenolic epoxy F51 was supplied by the company Shandong De source epoxy, inc., and C5 petroleum resin and C9 petroleum resin were supplied by the company Nanjing Rongda resin, inc.
Example 1
Cutting the NdFeB magnet into 3 NdFeB magnets, and then configuring insulating layer slurry: mixing the epoxy resin E44 and the cobalt powder in a mass ratio of 60:1.5, and then adding glass beads, wherein the addition amount of the glass beads is 2.5% of the total amount of the epoxy resin E44 and the cobalt powder, and completing slurry preparation. Treating the insulating layer slurry in a pulse magnetic field with a voltage of 200V and a 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 an insulating layer, and sintering and curing for 2h at 600 ℃.
Next, an adhesive layer slurry is prepared: c5 petroleum resin and epoxy resin E44 are mixed according to the mass ratio of 5: 1. Spraying the prepared adhesive layer slurry on the insulating layers of the 1 st and 2 nd neodymium-iron-boron magnets to form an adhesive layer, then combining the surface of the magnet coated with the insulating layer and the adhesive layer on the 1 st and the surface of the 2 nd which is not sprayed, combining the insulating layer and the adhesive layer sprayed on the 3 rd and the 2 nd, placing the combined materials on a clamping piece tool for pressing and clamping, solidifying for 2 hours at 300 ℃, and naturally cooling to room temperature.
Example 2
Cutting the NdFeB magnet into 3 NdFeB magnets, and then configuring insulating layer slurry: mixing the phenolic epoxy resin F51 and cobalt powder in a mass ratio of 65:2, and then adding quartz sand, wherein the addition amount of the quartz sand is 3% of the total amount of the phenolic epoxy resin F51 and cobalt powder, and the slurry preparation is completed. Treating the insulating layer slurry in a pulse magnetic field with voltage of 400V and 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 an insulating layer, and sintering and curing for 3 hours at 600 ℃.
Next, an adhesive layer slurry is prepared: c9 petroleum resin and epoxy resin E44 are mixed according to the mass ratio of 6: 1. Spraying the prepared adhesive layer slurry on the insulating layers of the 1 st and 2 nd neodymium-iron-boron magnets to form an adhesive layer, then combining the surface of the magnet coated with the insulating layer and the adhesive layer on the 1 st and the surface of the 2 nd which is not sprayed, combining the insulating layer and the adhesive layer sprayed on the 3 rd and the 2 nd, placing the combined materials on a clamping piece tool for pressing and clamping, solidifying for 2 hours at 300 ℃, and naturally cooling to room temperature.
Example 3
The procedure of this example was essentially the same as that of example 1, except that the mass ratio of epoxy resin E44 to cobalt powder was 70:2.5, and the mass ratio of C5 petroleum resin to epoxy resin E44 was 7.5:1, and the rest of the operation process is the same.
Comparative example 1
With reference to example 1, no glass beads were added in this comparative example, and the rest of the procedure was the same.
Comparative example 2
With reference to example 2, no cobalt powder was added in this comparative example, and the rest of the procedure was the same.
Comparative example 3
This comparative example is referred to in example 3, except that the epoxy resin E44 in "mixing the epoxy resin E44 and cobalt powder in a mass ratio of 60:1.5" is changed to a polyurethane resin having an average molecular weight of 2000.
The bonded NdFeB magnets obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to resistance measurement and coercivity measurement, and the obtained results are shown in tables 1 and 2.
TABLE 1 results of measurements of resistance values for examples 1-3 and comparative examples 1-3
Note that: the resistances in table 1 refer to the resistances of the sprayed insulating layer and adhesive layer between two adjacent neodymium-iron-boron magnets.
TABLE 2 coercivity measurement results for examples 1-3 and comparative examples 1-3
| Group of | Coercivity (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 cut and segmented neodymium-iron-boron magnet is treated by the technical scheme of the application, the bonded neodymium-iron-boron magnet has better insulating property and improved coercive force. The foregoing has outlined and described the basic principles, main features and features of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (3)
1. A processing method after cutting of neodymium-iron-boron magnet is characterized in that the neodymium-iron-boron magnet is cut into N pieces of neodymium-iron-boron magnet, N is a natural number greater than or equal to 2, insulating layer slurry is sprayed on the surfaces of the N-1 pieces of neodymium-iron-boron magnet cut into insulating layers after being processed in a pulse magnetic field, sintering and curing are carried out for 1.5-3 hours at 500-800 ℃, bonding layer slurry is sprayed on the insulating layers to form bonding layers, then the bonding layers are placed on a clamping piece tool for pressurizing and clamping, curing is carried out for 1-3 hours at 300-400 ℃, and natural cooling is carried out 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;
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;
the mass ratio of the epoxy resin to the oligomer is 1: (5-8);
the voltage of the pulse magnetic field is 200-400V, and the frequency is 10-20Hz;
the solid particles are glass beads or quartz sand.
2. The method of 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 epoxy resin.
3. The post-cutting treatment method of a neodymium-iron-boron magnet according to claim 2, wherein the petroleum resin is C5 petroleum resin or C9 petroleum resin.
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 CN113744986A (en) | 2021-12-03 |
| CN113744986B true CN113744986B (en) | 2023-09-22 |
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| CN113744986B (en) * | 2021-08-02 | 2023-09-22 | 安徽省瀚海新材料股份有限公司 | Treatment method for cut neodymium-iron-boron magnet |
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| CN113744986A (en) | 2021-12-03 |
| WO2023011464A1 (en) | 2023-02-09 |
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