CN114446629A - Rare earth magnetic steel for wind driven generator and manufacturing method thereof - Google Patents
Rare earth magnetic steel for wind driven generator and manufacturing method thereof Download PDFInfo
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- CN114446629A CN114446629A CN202210108928.6A CN202210108928A CN114446629A CN 114446629 A CN114446629 A CN 114446629A CN 202210108928 A CN202210108928 A CN 202210108928A CN 114446629 A CN114446629 A CN 114446629A
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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
- H01F41/0293—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
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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
- 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
- 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
- H01F41/0286—Trimming
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
- H01F7/0215—Flexible forms, sheets
Abstract
The invention relates to the technical field of magnet preparation, and discloses a rare earth magnetic steel for a wind driven generator and a manufacturing method thereof, wherein the manufacturing method bonds a first neodymium iron boron magnet and a second neodymium iron boron magnet through a bonding layer to form the rare earth magnetic steel for the wind driven generator, so that the skin effect of the magnetic steel is effectively avoided, two thin first neodymium iron boron magnet and two thin second neodymium iron boron magnet are bonded in a bonding layer bonding mode, the conductivity of the rare earth magnetic steel for the wind driven generator can be reduced, the eddy current effect of the magnetic steel is reduced, the service life of a motor can be effectively prolonged, in addition, the thickness of the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet is thinner, the use amount of heavy rare earth is not required to be increased, the problem of heavy rare earth distribution of the magnetic steel is reduced, and the uneven distribution of the heavy rare earth Tb, B and B of the heavy earth of the magnetic steel is effectively reduced, The usage amount of Dy saves expensive rare earth resources.
Description
Technical Field
The invention relates to the technical field of magnet preparation, in particular to rare earth magnetic steel for a wind driven generator and a manufacturing method thereof.
Background
At present, wind power generation forms a hot tide in the world, and is clean energy because the wind power generation does not need to use fuel and does not generate radiation or air pollution.
Wind power generation converts kinetic energy of wind into mechanical kinetic energy, and then converts the mechanical energy into electrical kinetic energy. The preparation of the wind driven generator needs to use a large amount of rare earth permanent magnet steel, and the volume of the steel is large. And because aerogenerator needs to deal with the adverse circumstances such as wind, sunlight, thunder and lightning, and cold and hot impact, consequently put forward higher requirement to the anti demagnetization performance (intrinsic coercive force) of tombarthite permanent magnet steel, and then lead to aerogenerator to need to use the tombarthite permanent magnet steel that thickness is greater than 10 mm. With the increasing importance of global environment protection and the achievement of the goals of carbon peak reaching and carbon neutralization in 2030 and 2060 years in China, wind power generation is further developed, a large amount of rare earth resources are consumed, and under the condition of the same generating capacity, how to reduce the use amount of rare earth becomes an urgent problem to be solved.
The traditional manufacturing technology of the rare earth neodymium iron boron magnetic steel comprises a smelting-hydrogen crushing-powder making-compression-sintering process, heavy rare earth Tb and Dy are required to be added in a smelting stage for preparing the high-performance magnetic steel, so that not only is the evaporation loss of Tb and Dy caused, but also most of Tb and Dy enter a magnetic steel main body phase, the residual magnetism of the magnetic steel is reduced, and a large amount of Tb and Dy heavy rare earth is consumed.
The grain boundary diffusion technology is a new technology which is developed recently and used for improving the demagnetization resistance of the neodymium iron boron magnetic steel, the main route of the technology is to prepare the low-performance low-cost neodymium iron boron magnetic steel firstly, then Tb and Dy are uniformly coated on the surface of the magnetic steel, the magnetic steel coated with Tb and Dy is subjected to high-temperature treatment in vacuum, Tb and Dy are melted and penetrate into the magnetic steel along the grain boundary, the technology can greatly improve the demagnetization resistance of the magnetic steel, the usage amount of the heavy rare earth Tb and Dy is reduced by nearly 60% compared with that of the traditional technology, and the technology is widely applied to the fields of new energy automobiles, variable frequency air conditioners and the like at present.
However, the wind driven generator needs to use rare earth permanent magnetic steel with the thickness of more than 10mm, and the existing grain boundary diffusion cannot be applied to the magnetic steel with the thicker thickness, because the thicker the magnetic steel is, the heavy rare earth is difficult to completely permeate into the center of the magnetic steel, the more the magnetic steel is close to the center, the less the heavy rare earth amount is, that is, the non-uniform distribution of the heavy rare earth of the magnetic steel is, so that the performance of the magnetic steel is uneven, and thus the skin effect is generated by the wind driven generator applying the magnetic steel, that is, the non-uniform distribution of current inside the magnetic steel is, the current is concentrated on the skin part of the magnetic steel, that is, the current is concentrated on the thin layer on the outer surface of the magnetic steel, the closer to the surface of the magnetic steel, the larger the current density is, and the actually, the current inside the magnetic steel is smaller. As a result, the resistance of the magnetic steel is increased, the power loss of the magnetic steel is also increased, and meanwhile, the working temperature of the motor is easily increased, which is not beneficial to the long-term use of the motor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem that the thicker magnet steel of thickness can not be applied to current grain boundary diffusion is because magnet steel thickness is thicker more, leads to heavy tombarthite to be difficult to permeate the center that gets into the magnet steel completely, and the magnet steel is more close to the heavy tombarthite volume at center less, also is the heavy tombarthite of magnet steel and distributes inequality promptly to cause the performance inequality of magnet steel, thereby lead to the aerogenerator who uses the magnet steel to produce skin effect.
In order to solve the technical problem, the invention provides a method for manufacturing rare earth magnetic steel of a wind driven generator, which comprises the following steps: providing a first neodymium iron boron prefabricated magnet and a second neodymium iron boron prefabricated magnet; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thicknesses of the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both 6-10 mm;
forming a first heavy rare earth element coating on the surface of the first neodymium iron boron prefabricated magnet;
forming a second heavy rare earth element coating on the surface of the second neodymium iron boron prefabricated magnet;
performing grain boundary diffusion on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating to obtain a first neodymium iron boron magnet;
performing grain boundary diffusion on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating to obtain a second neodymium iron boron magnet;
the first neodymium iron boron magnet is provided with a first side surface, and the first side surface is vertical to the thickness direction of the first neodymium iron boron prefabricated magnet; the second neodymium iron boron magnet is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet;
bonding the first side surface and the second side surface by an adhesive layer.
Optionally, the adhesive layer is an anaerobic adhesive layer.
Optionally, the thickness of the anaerobic adhesive layer is 0.06 mm.
Optionally, the material of the first heavy rare earth element coating comprises at least one of terbium and dysprosium; the material of the second heavy rare earth element coating comprises at least one of terbium and dysprosium.
Optionally, the method further includes:
before the first heavy rare earth element coating is formed on the surface of the first neodymium iron boron prefabricated magnet, the surface of the first neodymium iron boron prefabricated magnet is subjected to fine grinding, ultrasonic cleaning and drying treatment.
Optionally, the method further includes:
before the second heavy rare earth element coating is formed on the surface of the second neodymium iron boron prefabricated magnet, the surface of the second neodymium iron boron prefabricated magnet is subjected to fine grinding, ultrasonic cleaning and drying treatment.
Optionally, the step of performing grain boundary diffusion on the first ndfeb prefabricated magnet and the first heavy rare earth element coating includes: carrying out vacuum heat treatment and tempering treatment on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating;
and carrying out grain boundary diffusion on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating, wherein the step comprises the following steps: and carrying out vacuum heat treatment and tempering treatment on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating.
Optionally, the step of performing vacuum heat treatment and tempering treatment on the first ndfeb prefabricated magnet and the first heavy rare earth element coating includes:
placing the first neodymium iron boron prefabricated magnet with the first heavy rare earth element coating formed on the surface into a vacuum furnace for high-temperature treatment, so that the first heavy rare earth element coating is melted and diffused into the first neodymium iron boron prefabricated magnet, and then carrying out tempering treatment; wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
Optionally, the step of performing vacuum heat treatment and tempering treatment on the second ndfeb prefabricated magnet and the second heavy rare earth element coating includes:
placing the first neodymium iron boron prefabricated magnet with the first heavy rare earth element coating formed on the surface into a vacuum furnace for high-temperature treatment, so that the first heavy rare earth element coating is melted and diffused into the first neodymium iron boron prefabricated magnet, and then carrying out tempering treatment; wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
A rare earth magnetic steel for a wind driven generator comprises: the neodymium iron boron magnet comprises a first neodymium iron boron magnet, a second neodymium iron boron magnet and an adhesive layer; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thickness of each magnet is 6-10 mm;
the first neodymium iron boron magnet is provided with a first side surface, and the first side surface is vertical to the thickness direction of the first neodymium iron boron prefabricated magnet;
the second neodymium iron boron magnet is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet;
one side of the bonding layer is bonded with the first side surface, and the other side of the bonding layer is bonded with the second side surface.
Compared with the prior art, the rare earth magnetic steel for the wind driven generator and the manufacturing method thereof have the beneficial effects that:
according to the invention, the first neodymium-iron-boron magnet and the second neodymium-iron-boron magnet are bonded through the bonding layer to form the rare earth magnetic steel of the wind driven generator, so that compared with the rare earth magnetic steel of the wind driven generator manufactured by the traditional grain boundary diffusion technology, the rare earth magnetic steel of the wind driven generator manufactured by the method effectively avoids the skin effect of the magnetic steel, and the two thin first neodymium-iron-boron magnets and the second neodymium-iron-boron magnet are bonded in a bonding layer bonding mode, so that the conductivity of the rare earth magnetic steel of the wind driven generator can be reduced, the eddy current effect of the magnetic steel is reduced, the service life of the motor can be effectively prolonged, and in addition, because the thicknesses of the first neodymium-iron-boron prefabricated magnet and the second neodymium-iron-boron prefabricated magnet are thinner, the use amount of heavy rare earth does not need to be increased, the problem of heavy rare earth distribution of the magnetic steel is reduced, and the uneven heavy rare earth Tb, B and B are effectively reduced, The usage amount of Dy saves expensive rare earth resources. In addition, the thickness of the rare earth magnetic steel of the wind driven generator manufactured by the method can be larger than 10mm, so that the requirement that the wind driven generator needs to use the rare earth magnetic steel of the wind driven generator with the thickness larger than 10mm is met.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing rare earth magnetic steel for a wind turbine provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of rare earth magnetic steel of a wind driven generator according to an embodiment of the present invention.
In the figure, 1, a first neodymium-iron-boron magnet; 2. a second neodymium iron boron magnet; 3. and (7) bonding the layers.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
First, it should be noted that the orientations of top, bottom, upward, downward, and the like referred to herein are defined with respect to the orientation in the respective drawings, are relative concepts, and thus can be changed according to different positions and different practical states in which they are located. These and other orientations, therefore, should not be used in a limiting sense.
It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "an" does not exclude a plurality.
Furthermore, it should also be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the figures, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present application that are not directly mentioned herein.
It will be further understood that the terms "first," "second," and the like, are used herein to describe various information and should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present application.
It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.
As shown in fig. 1, a method for manufacturing rare earth magnetic steel of a wind turbine according to a preferred embodiment of the present invention includes:
s1, providing a first neodymium iron boron prefabricated magnet and a second neodymium iron boron prefabricated magnet; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thickness of each magnet is 6-10 mm.
S2, performing fine grinding, ultrasonic cleaning and drying treatment on the surface of the first neodymium iron boron prefabricated magnet, and then forming a first heavy rare earth element coating on the surface of the first neodymium iron boron prefabricated magnet;
s3, performing fine grinding, ultrasonic cleaning and drying treatment on the surface of the second neodymium iron boron prefabricated magnet, and then forming a second heavy rare earth element coating on the surface of the second neodymium iron boron prefabricated magnet;
s4, carrying out grain boundary diffusion on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating to obtain a first neodymium iron boron magnet 1.
In a possible embodiment, the step S4 may specifically include the following steps:
s41, carrying out vacuum heat treatment and tempering treatment on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating;
in a possible embodiment, step S41 may specifically include the following steps:
s41a, with the surface form first heavy rare earth element coating first neodymium iron boron prefabricated magnet is put into the vacuum furnace and is carried out high temperature treatment, makes first heavy rare earth element coating melt and spread into inside the first neodymium iron boron prefabricated magnet.
S42b, and then tempering. Wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
S5, performing grain boundary diffusion on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating to obtain a second neodymium iron boron magnet 2;
in a possible embodiment, the step S5 may specifically include the following steps:
s51, carrying out vacuum heat treatment and tempering treatment on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating;
in a possible embodiment, step S51 may specifically include the following steps:
s51a, with the first heavy rare earth element coating of surface formation first neodymium iron boron prefabricated magnet is put into the vacuum furnace and is carried out high temperature handle, makes first heavy rare earth element coating melts and spreads into inside the first neodymium iron boron prefabricated magnet.
S52b, tempering; wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
It is understood that the vacuum oven is pumped to 5X 10Pa by the vacuum pump set.
Specifically, this application can also carry out the accurate grinding surface through first neodymium iron boron magnetism body 1 and second neodymium iron boron magnetism body 2 after the grain boundary diffusion to make it smooth in order to can bond more easily.
S6, the first NdFeB magnet 1 is provided with a first side face, and the first side face is perpendicular to the thickness direction of the first NdFeB prefabricated magnet; the second neodymium iron boron magnet 2 is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet;
and S7, bonding the first side surface and the second side surface through a bonding layer 3. Preferably, the adhesive layer 3 is an anaerobic adhesive layer which has the characteristic of good chemical stability, so that the rare earth magnetic steel of the wind driven generator manufactured by the manufacturing method is increased. The thickness of the anaerobic adhesive layer is 0.06mm optimally.
The method is used for solving the problem that the existing grain boundary diffusion technology cannot be applied to the magnetic steel with thicker thickness, as the thicker the magnetic steel is, the more the magnetic steel is, the less the heavy rare earth amount of the magnetic steel is close to the center is, namely, the heavy rare earth of the magnetic steel is not uniformly distributed, so that the performance of the magnetic steel is not uniform, and the skin effect is generated by the wind driven generator applying the magnetic steel, namely, the current inside the magnetic steel is not uniformly distributed, the current is concentrated on the skin part of the magnetic steel, namely, the current is concentrated on the thin layer on the outer surface of the magnetic steel, the closer the magnetic steel surface is, the higher the current density is, and the smaller the current is actually generated inside the magnetic steel. As a result, the resistance of the magnetic steel is increased, the power loss of the magnetic steel is also increased, and meanwhile, the working temperature of the motor is easily increased, which is not beneficial to the long-term use of the motor.
In addition, the current part of manufacturers can increase the use amount of heavy rare earth for solving the problems so as to reduce the problem that the heavy rare earth of the magnetic steel is not uniformly distributed, thereby causing a great amount of waste of the heavy rare earth.
According to the method, a first heavy rare earth element coating and a second heavy rare earth element coating are respectively formed on the surfaces of the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet. The first heavy rare earth element coating and the second heavy rare earth element coating are prepared from heavy rare earth Tb and Dy, and then the first neodymium iron boron magnet 1 and the second neodymium iron boron magnet 2 are obtained through grain boundary diffusion. Because the thickness of the first neodymium iron boron prefabricated magnet and the thickness of the second neodymium iron boron prefabricated magnet are both 6mm-10mm, and the thickness of the first neodymium iron boron prefabricated magnet and the thickness of the second neodymium iron boron prefabricated magnet in the method are smaller than that of the conventional magnetic steel, the situation that heavy rare earth is difficult to completely permeate into the center of the magnetic steel is avoided, and the heavy rare earth on the surface and the center of the first neodymium iron boron magnet 1 and the second neodymium iron boron magnet 2 after being manufactured is distributed more uniformly. In addition, the method bonds the first neodymium iron boron magnet 1 and the second neodymium iron boron magnet 2 through the bonding layer 3 to form the rare earth magnetic steel of the wind driven generator, so that compared with the rare earth magnetic steel of the wind driven generator manufactured by the traditional grain boundary diffusion technology, the rare earth magnetic steel manufactured by the method effectively avoids the skin effect of the magnetic steel, bonds the two thin first neodymium iron boron magnet 1 and the second neodymium iron boron magnet 2 by adopting the bonding layer 3 bonding mode, can also reduce the conductivity of the rare earth magnetic steel of the wind driven generator, reduces the eddy current effect of the magnetic steel, can effectively prolong the service life of the motor, and in addition, because the thicknesses of the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are thinner, the use amount of heavy rare earth does not need to be increased, so as to reduce the problem of uneven distribution of the heavy rare earth of the magnetic steel, thereby effectively reducing the heavy rare earth Tb, Tb and 2, The usage amount of Dy saves expensive rare earth resources. In addition, the thickness of the rare earth magnetic steel of the wind driven generator manufactured by the method can be larger than 10mm, so that the requirement that the wind driven generator needs to use the rare earth magnetic steel of the wind driven generator with the thickness larger than 10mm is met.
It is noted that the material of the first heavy rare earth element coating includes at least one of terbium and dysprosium. The material of the second heavy rare earth element coating comprises at least one of terbium and dysprosium.
The present application further provides a wind power generator rare earth magnetic steel, see fig. 2, which includes: the neodymium iron boron magnet comprises a first neodymium iron boron magnet 1, a second neodymium iron boron magnet 2 and an adhesive layer 3; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thickness of each magnet is 6-10 mm.
The first neodymium iron boron magnet 1 is provided with a first side surface, and the first side surface is perpendicular to the thickness direction of the first neodymium iron boron prefabricated magnet; the second neodymium iron boron magnet 2 is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet.
One side of the adhesive layer 3 is adhered to the first side surface, and the other side of the adhesive layer 3 is adhered to the second side surface.
The aerogenerator rare earth magnet steel of this structure can satisfy thickness and be greater than 10mm to thereby solve 10 mm's aerogenerator rare earth magnet steel in the past and lead to heavy rare earth uneven distribution's problem because of the excess thickness, thereby reduce aerogenerator rare earth magnet steel's resistance, under the same conditions, make its loss power who compares prior art lower, and the temperature that is difficult for causing the generator risees, make it satisfy aerogenerator need use the requirement that thickness is greater than 10 mm's aerogenerator rare earth magnet steel.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for manufacturing rare earth magnetic steel of a wind driven generator is characterized by comprising the following steps: providing a first neodymium iron boron prefabricated magnet and a second neodymium iron boron prefabricated magnet; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thicknesses of the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both 6-10 mm;
forming a first heavy rare earth element coating on the surface of the first neodymium iron boron prefabricated magnet;
forming a second heavy rare earth element coating on the surface of the second neodymium iron boron prefabricated magnet;
carrying out grain boundary diffusion on the first neodymium-iron-boron prefabricated magnet and the first heavy rare earth element coating to obtain a first neodymium-iron-boron magnet;
performing grain boundary diffusion on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating to obtain a second neodymium iron boron magnet;
the first neodymium iron boron magnet is provided with a first side surface, and the first side surface is vertical to the thickness direction of the first neodymium iron boron prefabricated magnet; the second neodymium iron boron magnet is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet;
bonding the first side surface and the second side surface by an adhesive layer.
2. The method for manufacturing rare earth magnetic steel of a wind driven generator according to claim 1, wherein the bonding layer is an anaerobic adhesive layer.
3. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 2, wherein the thickness of anaerobic adhesive layer is 0.06 mm.
4. The method for manufacturing rare earth magnetic steel for wind driven generator according to claim 1, wherein the material of the first heavy rare earth element coating comprises at least one of terbium and dysprosium; the material of the second heavy rare earth element coating comprises at least one of terbium and dysprosium.
5. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 1, further comprising:
before the first heavy rare earth element coating is formed on the surface of the first neodymium iron boron prefabricated magnet, the surface of the first neodymium iron boron prefabricated magnet is subjected to fine grinding, ultrasonic cleaning and drying treatment.
6. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 5, further comprising:
before the second neodymium iron boron prefabricated magnet surface forms the second rare earth element coating, it is right the surface of second neodymium iron boron prefabricated magnet carries out fine grinding, ultrasonic cleaning to and drying process.
7. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 6,
and carrying out grain boundary diffusion on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating, wherein the step comprises the following steps of: carrying out vacuum heat treatment and tempering treatment on the first neodymium iron boron prefabricated magnet and the first heavy rare earth element coating;
and carrying out grain boundary diffusion on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating, wherein the step comprises the following steps of: and carrying out vacuum heat treatment and tempering treatment on the second neodymium iron boron prefabricated magnet and the second heavy rare earth element coating.
8. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 7, wherein the step of performing vacuum heat treatment and tempering treatment on the first ndfeb preformed magnet and the first heavy rare earth element coating comprises:
placing the first neodymium iron boron prefabricated magnet with the first heavy rare earth element coating formed on the surface into a vacuum furnace for high-temperature treatment, so that the first heavy rare earth element coating is melted and diffused into the first neodymium iron boron prefabricated magnet, and then carrying out tempering treatment; wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
9. The method for manufacturing rare earth magnetic steel of wind driven generator according to claim 8, wherein the step of performing vacuum heat treatment and tempering treatment on the second ndfeb preformed magnet and the second rare earth element coating comprises:
placing the first neodymium iron boron prefabricated magnet with the first heavy rare earth element coating formed on the surface into a vacuum furnace for high-temperature treatment, so that the first heavy rare earth element coating is melted and diffused into the first neodymium iron boron prefabricated magnet, and then carrying out tempering treatment; wherein the temperature range of the high-temperature treatment is 800-1000 ℃, and the temperature range of the tempering treatment is 400-600 ℃.
10. The utility model provides a aerogenerator tombarthite magnet steel which characterized in that includes: the neodymium iron boron magnet comprises a first neodymium iron boron magnet, a second neodymium iron boron magnet and an adhesive layer; the first neodymium iron boron prefabricated magnet and the second neodymium iron boron prefabricated magnet are both flat-shaped, and the thickness of each magnet is 6-10 mm;
the first neodymium iron boron magnet is provided with a first side surface, and the first side surface is vertical to the thickness direction of the first neodymium iron boron prefabricated magnet;
the second neodymium iron boron magnet is provided with a second side surface, and the second side surface is vertical to the thickness direction of the second neodymium iron boron prefabricated magnet;
one side of the bonding layer is bonded with the first side surface, and the other side of the bonding layer is bonded with the second side surface.
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| US20210296028A1 (en) * | 2017-08-09 | 2021-09-23 | Jl Mag Rare Earth Co., Ltd. | High temperature resistant neodymium-iron-boron magnets and method for producing the same |
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| US20210296028A1 (en) * | 2017-08-09 | 2021-09-23 | Jl Mag Rare Earth Co., Ltd. | High temperature resistant neodymium-iron-boron magnets and method for producing the same |
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