CN108538561B - Bonded neodymium-iron-boron magnet and preparation method thereof - Google Patents
Bonded neodymium-iron-boron magnet and preparation method thereof Download PDFInfo
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- CN108538561B CN108538561B CN201810172735.0A CN201810172735A CN108538561B CN 108538561 B CN108538561 B CN 108538561B CN 201810172735 A CN201810172735 A CN 201810172735A CN 108538561 B CN108538561 B CN 108538561B
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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
- 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
- H01F1/0578—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 bonded together
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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
- H01F41/0266—Moulding; Pressing
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- Manufacturing & Machinery (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a bonded neodymium iron boron magnet and a preparation method thereof, according to the characteristic that small particle adhesive powder is fast to dissolve, firstly, the adhesive powder and the magnetic powder are mixed, and then, a solvent is uniformly atomized and sprayed on the magnetic powder and the adhesive particles; the coupling agent in the solvent firstly modifies the surface of the magnetic powder in the stirring process, the adhesive is uniformly coated on the surface of the magnetic powder along with the dissolution of the adhesive, the adhesive powder adhesive prepared by the method is uniformly dispersed with the surface of the magnetic powder, the binding force between the magnetic powder and between the magnetic powder and the adhesive is strong, the uniformity of the granulated adhesive powder particles is good, and the uniformity of the powder fluidity and the strength can be greatly improved. Because the adhesive does not need to be dissolved in the solvent in advance, the operation efficiency and the proportioning precision of various components are greatly improved.
Description
Technical Field
The invention relates to a bonded neodymium iron boron magnet, in particular to a preparation method of magnetic powder for preparing the bonded neodymium iron boron magnet.
Background
The bonded neodymium iron boron magnet has the characteristics of good formability, high dimensional precision, good magnetic property uniformity, large shape freedom, high motor efficiency and the like, and is widely applied to the fields of electronic computers, household appliances, office equipment, automobiles and the like.
The preparation of the bonded neodymium iron boron magnet powder generally adopts the following process steps:
1. selecting the particle size of the magnetic powder, and crushing the magnetic powder to the particle size required by the process;
2. preparing a solution from the adhesive and acetone in advance according to a certain proportion;
3. adding the magnetic powder into mixing equipment, stirring for a certain time, adding the binder solution into the magnetic powder, and continuously stirring to prepare rubber powder;
4. drying the colloid and then crushing the colloid into magnetic powder particles with required granularity;
5. mixing 0.2-0.5% zinc stearate with the rubber powder to obtain the final product powder.
In the specific implementation, a container is required to be used for dissolving the adhesive in acetone in advance in the step 2, stirring is required for 2-5 hours in the dissolving process, and the adhesive is easily adhered to the wall of the container and a stirring rod in the preparation process, so that the proportioning is not correct.
In the step 3, the binder is also adhered to the wall of the funnel and the inner wall of the stirring container in the adding process of the binder solution, so that the proportion of the binder is reduced, and the binder is easy to agglomerate in the adding process and easily causes the phenomenon of uneven mixing;
furthermore, in step 3, add from the adhesive solution and volatilize to the magnetic powder again and become dry rubber powder to the adhesive, go on under normal atmospheric temperature and pressure usually, the solvent volatilizees and gets rid of more slowly, volatilizees at the solvent and is close when accomplishing in addition, along with the reduction of solvent, the stickness of adhesive and magnetic powder can be stronger and stronger, and the continuation stirring can produce a large amount of heats, and the rubber powder very easily becomes the very strong magnetic powder group of massive stickness this moment, and the later stage needs the breakage again can reach the technological requirement.
Due to the problems, the production efficiency of powder making is greatly influenced, and the practicability of the existing preparation process of the bonded neodymium iron boron magnet powder is poor.
Disclosure of Invention
Aiming at the problem of low efficiency of the existing preparation process of the bonded neodymium iron boron magnet powder, a new bonded neodymium iron boron magnet scheme is needed.
Therefore, the invention aims to provide a bonded neodymium iron boron magnet and a preparation method thereof.
In order to solve the problems, the invention provides a bonded neodymium iron boron magnet which comprises the following components in parts by weight:
95-97 parts of neodymium iron boron magnetic powder;
1.5-3 parts of thermosetting binder;
0.3-0.5 part of a coupling agent;
0.1-0.5 part of lubricant.
Further, the thermosetting adhesive is bisphenol A epoxy resin.
Furthermore, the thermosetting binder is powdery thermosetting binder W-6C, and the granularity of the binder powder is more than or equal to 200 meshes.
Further, the lubricant is zinc stearate or calcium stearate.
Further, the coupling agent is a silane coupling agent KH-550.
In order to solve the above problems, the preparation method of the bonded neodymium iron boron magnet provided by the invention comprises the following steps:
mixing the thermosetting adhesive powder and the neodymium iron boron magnetic powder;
uniformly atomizing and spraying a solvent on the neodymium iron boron magnetic powder and the binder particles, modifying the surface of the magnetic powder by using a coupling agent in the solvent in the stirring process, and uniformly coating the binder on the surface of the magnetic powder along with the dissolution of the binder to form rubber powder;
uniformly mixing the rubber powder lubricant to obtain a magnetic powder mixture;
putting the magnetic powder mixture into a mould for pressing to obtain a magnet green body;
and curing the magnet green body at 150-180 ℃ for 1-2.5 h to obtain the bonded neodymium iron boron magnet.
Furthermore, the particle size of the neodymium iron boron magnetic powder is more than 120 meshes, wherein 150-250 meshes account for 60-80%.
Further, in the step of forming the rubber powder, the thermosetting binder and the magnetic powder are dry-mixed together and stirred for 5-10min until the magnetic powder and the binder are fully and uniformly mixed.
Further, in the step of forming the rubber powder, an acetone solution is formed by dissolving the coupling agent in acetone which is a solvent.
Further, in the step of forming the rubber powder, an acetone solution is sprayed on the mixture of the magnetic powder and the thermosetting binder by a spraying device during stirring.
Further, in the step of forming the rubber powder, after the acetone solution is added into the mixture of the magnetic powder and the thermosetting binder, the equipment continues to stir for 5-10min, so that the binder is fully dissolved in the acetone solution and fully dissolved with the surface of the magnetic powder particles.
Further, in the step of forming the rubber powder, heating is carried out in the stirring process, the heating temperature is 35-40 ℃, and meanwhile, the container is vacuumized, and the vacuum degree is 0.08-0.10 KPa.
Further, in the step of forming the rubber powder, after the acetone solution is removed, the rubber powder enters a refrigeration state.
The bonded neodymium iron boron magnet provided by the scheme of the invention has the advantages of strong bonding capability, high density, good formability and good consistency; meanwhile, the preparation method of the bonded neodymium iron boron magnet provided by the scheme of the invention can solve the problems of large formula error and poor flowability of the mixed magnetic powder in the powder preparation process of the existing bonded neodymium iron boron magnetic powder, and can effectively improve the product consistency, improve the production efficiency and reduce the production cost.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific examples.
Through extensive and intensive research, the scheme aims at the problems of the existing bonded neodymium iron boron magnet, and obtains the bonded neodymium iron boron magnet with strong bonding capability, high density, good formability and good consistency by improving the formula.
The bonded neodymium-iron-boron magnet comprises the following components in parts by weight:
on the basis, the following specific formula with synergistic effect is further adopted:
the thermosetting binder in the scheme adopts bisphenol A epoxy resin, and in order to be beneficial to the preparation of the magnetic powder in the scheme, powdery thermosetting binder W-6C is preferably selected, and meanwhile, the granularity of the binder powder is more than or equal to 200 meshes.
In combination with the lubricant, zinc stearate or calcium stearate is preferred in the scheme.
In combination with the above, the coupling agent in the present embodiment is preferably a silane coupling agent KH-550.
Compared with the existing bonded NdFeB magnet, the bonded NdFeB magnet formed in the way has the advantages of strong bonding capability, high density, good formability and good consistency.
When the bonded neodymium iron boron magnet with the formula is prepared, firstly, the adhesive powder and the magnetic powder are mixed according to the characteristic that the adhesive powder with the tiny particles is fast to dissolve, and then, the solvent is uniformly atomized and sprayed on the magnetic powder and the adhesive particles; the coupling agent in the solvent firstly modifies the surface of the magnetic powder in the stirring process, the adhesive is uniformly coated on the surface of the magnetic powder along with the dissolution of the adhesive, the adhesive powder adhesive prepared by the method is uniformly dispersed with the surface of the magnetic powder, the binding force between the magnetic powder and between the magnetic powder and the adhesive is strong, the uniformity of the granulated adhesive powder particles is good, and the uniformity of the powder fluidity and the strength can be greatly improved. Because the adhesive does not need to be dissolved in the solvent in advance, the operation efficiency and the proportioning precision of various components are greatly improved.
According to the principle, the bonded neodymium iron boron magnet is prepared through the following steps:
(1) crushing the needed neodymium iron boron magnetic powder and sieving the crushed powder with a sieve with more than or equal to 120 meshes;
(2) adding 95-97 parts of sieved neodymium iron boron magnetic powder and 1.5-3 parts of thermosetting binder (such as powdery W-6C) into mixing equipment, uniformly stirring, and uniformly spraying 5-7 parts of acetone solution added with 0.2-0.5 part of coupling agent onto the surface of the mixture of the magnetic powder and the thermosetting binder through atomization equipment to prepare rubber powder;
(3) uniformly mixing the rubber powder obtained in the step (2) with 0.1-0.5 part of lubricant to obtain a magnetic powder mixture;
(4) putting the magnetic powder mixture obtained in the step (3) into a mould for pressing to obtain a magnet green body;
(5) and (5) curing the magnet green body obtained in the step (4) at the temperature of 150-180 ℃ for 1-2.5 h to obtain the bonded neodymium iron boron magnet.
In the preparation process, in the step (1), the particle size of the crushed neodymium iron boron magnetic powder is more than 120 meshes, wherein the proportion of 150-250 meshes is 60-80%. The magnetic powder is crushed, the particle size of the powder is optimized, the fluidity, the capability of filling pores and the binding capability of the magnetic powder and a binder can be increased, and conditions are created for improving the pressing property of the magnet.
In the preparation process, the step (2) is implemented by the following steps:
the powdery adhesive W-6C and the magnetic powder are dry-mixed together, and the mixture needs to be stirred for 5-10min to ensure that the magnetic powder and the adhesive are fully and uniformly mixed;
dissolving a silane coupling agent KH-550 in a solvent acetone to form an acetone solution;
after the magnetic powder and the powdery binder W-6C are uniformly mixed, the formed acetone solution is sprayed on the mixture of the magnetic powder and the powdery binder through a spraying device during stirring.
After the acetone solution is added into the mixture of the magnetic powder and the powdery adhesive W-6C, the equipment continues to stir for 5-10min, and the adhesive is ensured to be fully dissolved in the acetone solution and fully soaked with the surfaces of the magnetic powder particles.
And continuously stirring the rubber powder to effectively volatilize the acetone, starting a heating function to heat the stirring container in the stirring process, wherein the heating temperature is 35-40 ℃, and simultaneously vacuumizing the container, and the vacuum degree is 0.08-0.10KPa, so that the volatilization of the acetone can be effectively accelerated, and the powder preparation efficiency can be improved.
And finally, after the solvent is removed, in order to reduce the heat generated in the rubber powder stirring process and prevent the rubber powder from agglomerating, starting a refrigeration mode and preventing the large-particle agglomerated magnetic powder from generating.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Example 1
The bonded neodymium-iron-boron magnet provided by the example is composed of the following components in parts by weight:
95 parts of neodymium iron boron magnetic powder;
1.5 parts of thermosetting binder W-6C;
KH-5500.3 parts of a silane coupling agent;
0.1 part of zinc stearate.
And the particle size of the binder powder in this example was 250 mesh.
This example completes the preparation of a bonded neodymium iron boron magnet by the following process:
(1) crushing the needed neodymium iron boron magnetic powder and passing through a 200-mesh screen;
(2) adding 95 parts of sieved neodymium iron boron magnetic powder and 1.5 parts of powdery thermosetting binder W-6C into mixing equipment, uniformly stirring, and uniformly spraying 5 parts of acetone solution added with 0.2 part of coupling agent onto the surface of the mixture of the magnetic powder and the thermosetting binder through atomization equipment to prepare rubber powder;
(3) uniformly mixing the obtained rubber powder and 0.1 part of zinc stearate to obtain a magnetic powder mixture;
(4) putting the obtained magnetic powder mixture into a mould for pressing to obtain a magnet green body;
(5) and curing the obtained magnet green body at 150 ℃ for 1h to obtain the bonded neodymium iron boron magnet.
In the scheme of the embodiment, the adhesive powder binder and the magnetic powder are uniformly dispersed on the surface, the binding force between the magnetic powder and between the magnetic powder and the binder are strong, and the uniformity of granulated adhesive powder particles is good, so that the uniformity of powder flowability and strength can be greatly improved; moreover, because the adhesive does not need to be dissolved in the solvent in advance, the working efficiency and the proportioning precision of various components are greatly improved.
Example 2
The bonded neodymium-iron-boron magnet provided by the example is composed of the following components in parts by weight:
and the particle size of the binder powder in this example is 300 mesh.
This example completes the preparation of a bonded neodymium iron boron magnet by the following process:
(1) crushing the needed neodymium iron boron magnetic powder and passing through a 300-mesh screen;
(2) adding 96 parts of sieved neodymium iron boron magnetic powder and 2 parts of powdery thermosetting binder W-6C into mixing equipment, uniformly stirring, and uniformly spraying 6 parts of acetone solution added with 0.4 part of coupling agent onto the surface of the mixture of the magnetic powder and the thermosetting binder through atomization equipment to prepare rubber powder;
(3) mixing the obtained rubber powder with 0.2 part of calcium stearate uniformly to obtain a magnetic powder mixture;
(4) putting the obtained magnetic powder mixture into a mould for pressing to obtain a magnet green body;
(5) and curing the obtained magnet green body at 160 ℃ for 2h to obtain the bonded neodymium iron boron magnet.
In the scheme of the embodiment, the adhesive powder binder and the magnetic powder are uniformly dispersed on the surface, the binding force between the magnetic powder and between the magnetic powder and the binder are strong, and the uniformity of granulated adhesive powder particles is good, so that the uniformity of powder flowability and strength can be greatly improved; moreover, because the adhesive does not need to be dissolved in the solvent in advance, the working efficiency and the proportioning precision of various components are greatly improved.
Example 3
The bonded neodymium-iron-boron magnet provided by the example is composed of the following components in parts by weight:
and the particle size of the binder powder in this example is 300 mesh.
This example completes the preparation of a bonded neodymium iron boron magnet by the following process:
(1) crushing the needed neodymium iron boron magnetic powder and passing through a 400-mesh screen;
(2) adding 97 parts of sieved neodymium iron boron magnetic powder and 2.5 parts of powdery thermosetting binder W-6C into mixing equipment, uniformly stirring, and uniformly spraying 7 parts of acetone solution added with 0.5 part of coupling agent onto the surface of the mixture of the magnetic powder and the thermosetting binder through atomizing equipment to prepare rubber powder;
(3) mixing the obtained rubber powder with 0.4 part of calcium stearate uniformly to obtain a magnetic powder mixture;
(4) putting the obtained magnetic powder mixture into a mould for pressing to obtain a magnet green body;
(5) and curing the obtained magnet green body at 180 ℃ for 2.5h to obtain the bonded neodymium iron boron magnet.
In the scheme of the embodiment, the adhesive powder binder and the magnetic powder are uniformly dispersed on the surface, the binding force between the magnetic powder and between the magnetic powder and the binder are strong, and the uniformity of granulated adhesive powder particles is good, so that the uniformity of powder flowability and strength can be greatly improved; moreover, because the adhesive does not need to be dissolved in the solvent in advance, the working efficiency and the proportioning precision of various components are greatly improved.
Based on the above example scheme, it can be determined that the bonded neodymium iron boron magnet and the preparation scheme thereof provided by the invention have the following advantages compared with the prior art:
1. the binder powder and the magnetic powder with a certain granularity are mixed in advance, so that the proportion of various substances is accurate, and the error is small;
2. the dry powder adhesive and the magnetic powder are mixed, so that the process of dissolving the adhesive in advance is omitted, and the production efficiency is improved;
3. the adhesive dry powder is directly mixed into the magnetic powder without a container for dissolving the adhesive, so that the links of cleaning the container and a funnel are omitted, and most importantly, the environmental pollution is reduced;
4. the coupling agent is innovatively added into the solvent and then sprayed to the surfaces of the magnetic powder and the adhesive powder through atomizing equipment to directly modify the surfaces of the adhesive and the magnetic powder particles, and the adding mode is simple and effective;
5. the solvent is added in a mode of stirring and spraying at the same time, so that the magnetic powder and the adhesive are combined more uniformly and directly, the granulation time is shortened, and the production efficiency is higher.
6. The method has high solvent utilization rate and saves the solvent by 1 to 2 percent.
7. The granulation process is accurately controlled by heating and cooling the rubber powder in the granulation process, the method is used for granulation, the powder is fine in granularity, 80-90% of most of the powder can reach the granularity required by the process, only a small part of the rubber powder needs to be crushed and sieved, and the powder granulation efficiency is high.
The foregoing shows and describes the general principles, essential features, and advantages of the 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 (13)
1. The preparation method of the bonded neodymium iron boron magnet is characterized by comprising the following steps:
mixing the thermosetting adhesive powder and the neodymium iron boron magnetic powder;
adding a coupling agent into a solvent, uniformly atomizing and spraying the solvent on the surfaces of the neodymium iron boron magnetic powder and the binder particles to directly modify the surfaces of the neodymium iron boron magnetic powder and the binder particles, firstly modifying the surfaces of the magnetic powder by the coupling agent in the solvent in the stirring process, and uniformly coating the binder on the surfaces of the magnetic powder along with the dissolution of the binder to form rubber powder;
uniformly mixing the rubber powder lubricant to obtain a magnetic powder mixture;
putting the magnetic powder mixture into a mould for pressing to obtain a magnet green body;
and curing the magnet green body at 150-180 ℃ for 1-2.5 h to obtain the bonded neodymium iron boron magnet.
2. The method for preparing bonded NdFeB magnet according to claim 1, wherein the NdFeB magnet powder has a particle size of 120 meshes or more, wherein 150-250 meshes accounts for 60-80%.
3. The method of claim 1, wherein in the step of forming the glue powder, the thermosetting binder and the magnetic powder are dry-mixed together and stirred for 5-10min until the magnetic powder and the binder are fully and uniformly mixed.
4. The method of manufacturing a bonded neodymium-iron-boron magnet according to claim 1, wherein in the step of forming the rubber powder, the acetone solution is formed by dissolving the coupling agent in acetone, a solvent.
5. The method of manufacturing a bonded neodymium-iron-boron magnet according to claim 1, wherein in the step of forming the rubber powder, the acetone solution is sprayed on the mixture of the magnetic powder and the thermosetting binder through a spraying device during stirring.
6. The method of claim 1, wherein in the step of forming the glue powder, after the acetone solution is added to the mixture of the magnetic powder and the thermosetting binder, the equipment continues to stir for 5-10min, so that the binder is fully dissolved in the acetone solution and fully dissolved with the surface of the magnetic powder particles.
7. The method for preparing a bonded neodymium-iron-boron magnet according to claim 1, wherein in the step of forming the rubber powder, heating is carried out in a stirring process, the heating temperature is 35-40 ℃, and meanwhile, the container is vacuumized, and the vacuum degree is 0.08-0.10 KPa.
8. The method of manufacturing a bonded neodymium-iron-boron magnet according to claim 1, wherein in the step of forming the rubber powder, after the acetone solution is removed, a cooling state is entered.
9. A bonded NdFeB magnet, which is prepared based on the preparation method of any one of claims 1 to 8, and comprises the following components in parts by weight:
10. a bonded neodymium iron boron magnet according to claim 9, characterized in that the thermosetting binder is a bisphenol a type epoxy resin.
11. The bonded neodymium iron boron magnet of claim 10, wherein the thermosetting binder is powdered thermosetting binder W-6C, and the particle size of the binder powder is not less than 200 mesh.
12. The bonded neodymium-iron-boron magnet according to claim 9, characterized in that the lubricant is zinc stearate or calcium stearate.
13. The bonded neodymium-iron-boron magnet according to claim 9, wherein the coupling agent is a silane coupling agent KH-550.
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| CN113410019A (en) * | 2021-06-30 | 2021-09-17 | 安徽恒磁磁电有限公司 | Shock-resistant corrosion-resistant bonded neodymium iron boron magnet and preparation method thereof |
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| WO2008032426A1 (en) * | 2006-09-15 | 2008-03-20 | Intermetallics Co., Ltd. | PROCESS FOR PRODUCING SINTERED NdFeB MAGNET |
| CN101656134A (en) * | 2008-08-18 | 2010-02-24 | 上海爱普生磁性器件有限公司 | High temperature resistant bonding rare earth magnet and preparation method thereof |
| CN101710518A (en) * | 2009-12-21 | 2010-05-19 | 上海爱普生磁性器件有限公司 | Boned neodymium iron boron permanent magnet and manufacturing method thereof |
| CN104584148B (en) * | 2012-08-27 | 2017-12-26 | 因太金属株式会社 | NdFeB based sintered magnets |
| CN105374543B (en) * | 2015-12-03 | 2018-01-23 | 湖南航天磁电有限责任公司 | A kind of preparation method of Agglutinate neodymium-iron-boron ferrite permanent magnet |
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