CN110459397B - Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode - Google Patents
Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode Download PDFInfo
- Publication number
- CN110459397B CN110459397B CN201910764757.0A CN201910764757A CN110459397B CN 110459397 B CN110459397 B CN 110459397B CN 201910764757 A CN201910764757 A CN 201910764757A CN 110459397 B CN110459397 B CN 110459397B
- Authority
- CN
- China
- Prior art keywords
- boron magnet
- iron boron
- neodymium iron
- coating
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
-
- 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
Abstract
The invention belongs to the technical field of neodymium iron boron magnets, and particularly relates to a method for preparing a neodymium iron boron magnet by adding heavy rare earth in a coating mode, which comprises the steps of attaching a diffusion source to the surface of a sintered neodymium iron boron magnet to form a coating, and simultaneously applying laser shock and ultrasonic vibration to the coating; according to the invention, through the modes of laser shock and ultrasonic vibration, alloy components of a diffusion source are ensured to fully permeate into gaps of the neodymium iron boron magnet to improve the neodymium iron boron magnet, so that the neodymium iron boron magnet has better coercive force; in addition, based on the processing mode of laser shock and ultrasonic vibration, the diffusion source alloy components show better compactness in gaps of the neodymium iron boron magnet, and the physical and chemical properties of a grain boundary phase on the surface of the neodymium iron boron magnet are obviously improved, so that the comprehensive performance of the neodymium iron boron magnet is improved, and the weakening of other performances of the neodymium iron boron magnet caused by the introduction of the alloy mode is offset.
Description
Technical Field
The invention belongs to the technical field of neodymium iron boron magnets, and particularly relates to a method for preparing a neodymium iron boron magnet by adding heavy rare earth in a coating mode.
Background
The sintered Nd-Fe-B permanent magnet has the advantages of high magnetic performance, simple manufacturing process, low cost and the like, and is widely applied to the fields of micro-special motors, magnetic separation equipment, magnetic machinery, nuclear magnetic resonance imaging equipment and the like. However, as the temperature rises, the coercive force of the magnet rapidly drops, the irreversible loss of the magnetic flux of the magnet at higher temperature is increased due to the reduction of the coercive force, and the external field interference resistance is greatly reduced. Coercivity is an important performance parameter for such magnets.
The traditional means for improving the coercivity of the sintered neodymium-iron-boron magnet is to add heavy rare earth elements during smelting to improve the anisotropy field of crystal grains, so that the coercivity is improved. Limited resource shortage of heavy rare earth, and intensive utilization of heavy rare earth is a problem to be solved at present in view of cost. In recent years, grain boundary diffusion of heavy rare earth, which is a process of diffusing heavy rare earth elements attached to the surface of a sintered neodymium-iron-boron magnet into the interior of the sintered neodymium-iron-boron magnet along a molten grain boundary by a heat treatment process, has been widely studied as a method of intensively utilizing the heavy rare earth. The heavy rare earth can be intensively distributed near the grain boundary of the sintered neodymium iron boron magnet through the grain boundary diffusion process, the use amount of the heavy rare earth is small, the coercive force can be obviously improved, and the residual magnetism is prevented from being greatly reduced. For example, chinese patent application No. 201711416008.6 discloses a method for improving the coercivity of a sintered ndfeb magnet by using grain boundary diffusion, which comprises attaching a diffusion source to the surface of the sintered ndfeb magnet to form a coating, then performing dehydrogenation treatment, and finally performing diffusion treatment on the coating to obtain the sintered ndfeb magnet permeated with heavy rare earth elements; the implementation of the technical scheme depends on the activity increase of hydride powder of the R1-R2-M type alloy forming the coating after dehydrogenation treatment, namely, the effective diffusion of heavy rare earth elements on the surface of the sintered neodymium iron boron magnet can be ensured only through dehydrogenation treatment, and the effect of improving the coercive force is achieved. Furthermore, as known to those skilled in the art, the above method using grain boundary diffusion also introduces alloy elements into the sintered ndfeb magnet, and thus, other performance indexes of the sintered ndfeb magnet, such as magnetic energy product, are also reduced to some extent.
In this way, it is an urgent technical problem for those skilled in the art to develop a method capable of improving the coercive force of a magnet and reducing the influence on other properties of the magnet.
Disclosure of Invention
The invention aims to provide a method which can improve the coercive force of a sintered neodymium-iron-boron magnet and reduce the influence on other performances of the sintered neodymium-iron-boron magnet.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for preparing a neodymium iron boron magnet by adding heavy rare earth in a coating mode.
According to the invention, laser impact can generate heat, so that a diffusion source in the coating is molten and then permeates into the neodymium iron boron magnet, the diffusion source alloy is induced to permeate to a deeper depth by using an ultrasonic vibration mode, and a grain boundary at a deeper position of the neodymium iron boron magnet is improved, thereby further ensuring that the neodymium iron boron magnet has higher coercive force. Meanwhile, the ultra-strong shock wave generated by the laser shock can change the grain boundary phase composition and structure of the surface of the neodymium iron boron magnet, improve the physicochemical property of the grain boundary phase and improve the compactness of the surface of the neodymium iron boron magnet, thereby improving the comprehensive performance of the neodymium iron boron magnet; namely, the influence of the mode of introducing the alloy on other properties of the neodymium iron boron magnet, such as magnetic energy product, is weakened.
According to the invention, the parameters of the laser shock can be selected in a wide range, preferably, the pulse width of the laser shock is 10-15 ns, and the single pulse energy is 5-20J.
In the invention, the purpose of ultrasonic vibration is to promote the diffusion source alloy melted by laser impact to penetrate to a deeper position of the neodymium iron boron magnet, thereby ensuring the improvement of the coercive force of the neodymium iron boron magnet. The parameters of the ultrasonic vibration can be selected in a wide range, and preferably, the frequency of the ultrasonic vibration is 100-150 kHz, the amplitude is 10-50 mu m, and the ultrasonic vibration power is 500-3000W.
According to the invention, in order to avoid introducing impurities, the neodymium iron boron magnet is subjected to pretreatment operation before coating formation, laser shock and ultrasonic vibration, and specifically, the pretreatment comprises the following steps: and (3) grinding, polishing and cleaning the surface of the sintered neodymium-iron-boron magnet, then spraying a sodium chloride solution on the surface of the sintered neodymium-iron-boron magnet, standing for 30 minutes and then washing. More specifically, the surface of the neodymium iron boron magnet is ground and polished by using 1000# to 2000# SiC abrasive paper, and then the surface of the neodymium iron boron magnet is cleaned of dust and oil stains by putting the neodymium iron boron magnet into an ultrasonic cleaning machine and adding 2.5% ethanol solution in volume fraction. The purpose of spraying the sodium chloride solution is to form weak corrosion on the surface of the neodymium iron boron magnet to obtain atom vacancies or gaps at the surface layer grain boundary, so that the diffusion source alloy is easier to permeate and invade into the neodymium iron boron magnet under the conditions of laser shock and ultrasonic vibration. The concentration of the sodium chloride solution is not particularly limited, and specifically, the sodium chloride solution may be a sodium chloride solution with a mass fraction of 5%.
In the invention, the diffusion source is Tb0.3Dy0.7(Fe1-xAlx)2Alloy powder, wherein x is 0.05, 0.10 or 0.15; the grain diameter of the alloy powder is 1-2 mm. The alloy component permeates into the grain boundary in the neodymium iron boron magnetThe coercive force of the neodymium iron boron magnet can be effectively improved; meanwhile, the Al element is compounded in the alloy components, although anisotropy is reduced, the resistivity and the compressive strength of the alloy are improved based on the position of partial Fe replaced by the Al element, and the diffusion source can be promoted to penetrate to a deeper position based on the compounding of the Al element, so that the coercive force of the neodymium iron boron magnet is improved.
In the invention, the thickness of the coating formed on the surface of the sintered neodymium-iron-boron magnet by the diffusion source is not too thick, and if the thickness is too thick, the heavy rare earth elements are easily wasted, and if the thickness is too thin, enough heavy rare earth elements cannot be provided to improve the neodymium-iron-boron magnet. Preferably, in the invention, the thickness of the coating formed on the surface of the sintered neodymium iron boron by the diffusion source is 1-5 μm.
According to the invention, the laser shock has a spot radius of 2-3 mm, the laser shock treatment is carried out on the sintered neodymium iron boron magnet to be treated line by line, and the lap joint rate between each line is 50% or more. In a specific implementation process, the center of a laser beam spot is overlapped with the upper left corner of the surface of the neodymium iron boron magnet to be processed to serve as an initial position of laser impact, so that the surface of the neodymium iron boron magnet is impacted line by line, and in order to obtain a better impact effect, the overlapped impact among lines is realized, namely, when the next line is impacted, the impacted area of the previous line is impacted again, the overlapping rate is 50% or more, and a good impact effect is ensured.
The invention also provides a method for preparing the neodymium iron boron magnet by adding the heavy rare earth in a coating mode, which comprises the steps of attaching a diffusion source to the surface of the sintered neodymium iron boron magnet to form a coating, and simultaneously applying laser shock and ultrasonic vibration to the coating; and repeating the steps of forming the coating and applying laser shock and ultrasonic vibration for 2-3 times to obtain the treated neodymium-iron-boron magnet. In the technical scheme, the diffusion source forms a multi-layer interface structure in a gap of the neodymium iron boron magnet by repeatedly forming a coating and applying laser shock and ultrasonic vibration, and the repeated shock enables the diffusion source alloy which is firstly shocked to have a better compactness degree in the neodymium iron boron magnet, so that the longer-acting coercive force of the neodymium iron boron magnet is further improved.
Compared with the prior art, the invention has the following technical effects:
1. according to the method for preparing the neodymium iron boron magnet, provided by the invention, the alloy components of the diffusion source are ensured to fully permeate into the gap of the neodymium iron boron magnet to improve the neodymium iron boron magnet in a laser shock and ultrasonic vibration mode, so that the neodymium iron boron magnet has better coercive force; in addition, based on the processing mode of laser shock and ultrasonic vibration, the diffusion source alloy components show better compactness in gaps of the neodymium iron boron magnet, and the physical and chemical properties of a grain boundary phase on the surface of the neodymium iron boron magnet are obviously improved, so that the comprehensive performance of the neodymium iron boron magnet is improved, and the weakening of other performances of the neodymium iron boron magnet caused by the introduction of the alloy mode is offset.
2. According to the method for preparing the neodymium iron boron magnet, the diffusion source alloy components in the coating are treated in the laser shock mode, the purpose of grain refinement is achieved, gas in the material is removed, oxide inclusions are reduced, and the fatigue life of the neodymium iron boron magnet is obviously prolonged.
3. According to the method for preparing the neodymium iron boron magnet, the penetration depth of the diffusion source alloy components is deep through the cooperation of laser impact and ultrasonic vibration, and the step of tempering treatment after treatment is not needed.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
The invention provides a method for preparing a neodymium iron boron magnet by adding heavy rare earth in a coating mode.
In the present invention, the diffusion source is prepared by formulating Tb, Dy, Fe, Al (Tb: 99.99%, Dy: 99.9%, Fe: 99.98%, Al: 99.9%) as the raw materials into the desired componentsIs Tb0.3Dy0.7(Fe1-xAlx)2The alloy of (1); wherein x is 0.05, 0.10 or 0.15; in the specific preparation method, excessive Tb and Dy are added according to 5% burning loss to compensate positive loss, a sample is smelted by high-vacuum non-consumable arc smelting equipment under the protection of high-purity argon gas, suction casting is carried out on the smelted sample to obtain alloy, then the alloy is crushed to obtain alloy powder with the particle size of 1-2mm, and the alloy powder is prepared into slurry by using ethanol solution, wherein each 1g of the alloy powder is matched with 10mL of ethanol solution (95 vt%).
Hereinafter, a magnet of size N48 is used
The method for preparing the neodymium iron boron magnet provided by the invention is further illustrated by specific examples.
Example 1
A method of making a neodymium iron boron magnet comprising the steps of:
s1: grinding and polishing the surface of a magnet with a commercial trademark of N48 by using 1500# SiC abrasive paper, and then putting the magnet into an ultrasonic cleaning machine, and removing dust and oil stains on the surface of the neodymium iron boron magnet by using an ethanol solution with the volume fraction of 2.5%; spraying a sodium chloride solution with the mass fraction of 5% on the surface of the neodymium iron boron magnet after lifting and draining, standing for 30min, and then washing the neodymium iron boron magnet with deionized water to obtain a primarily treated neodymium iron boron magnet;
s2: preparing diffusion source slurry, adding Tb0.3Dy0.7(Fe0.95Al0.05)2The alloy powder was crushed to a particle size of 1.5mm and mixed with an ethanol solution (95 vt%) in a ratio of 1 g: preparing the mixture into slurry according to the proportion of 10 mL;
s3: forming a coating layer with a thickness of 3 μm on the slurry prepared in the coating step S2 of the neodymium iron boron magnet; after the coating is solidified, simultaneously applying laser shock and ultrasonic vibration to the coating; the pulse width of the laser impact is 12ns, and the single pulse energy is 10J; the frequency of the ultrasonic vibration is 120kHz, the amplitude is 20 mu m, and the ultrasonic vibration power is 2000W;
the laser shock light spot radius is 2mm, and the laser shock processing is carried out on the sintered neodymium iron boron magnet to be processed line by line, and the lap joint rate between each line is 50%. And finishing the treatment to obtain the finished neodymium iron boron magnet.
Example 2
The method of manufacturing a ndfeb magnet as provided in example 1, except that, in step S3, the thickness of the coating layer formed on the surface of the ndfeb magnet by the slurry is 1 μm; and (5) keeping the other treatment methods unchanged to obtain the treated neodymium-iron-boron magnet.
Example 3
The method of manufacturing a ndfeb magnet as provided in example 1, except that, in step S3, the thickness of the coating layer formed on the surface of the ndfeb magnet by the slurry is 5 μm; and (5) keeping the other treatment methods unchanged to obtain the treated neodymium-iron-boron magnet.
Comparative example 1
The method of manufacturing a ndfeb magnet as provided in example 1, except that, in step S3, the slurry forms a coating thickness of 0.5 μm on the surface of the ndfeb magnet; and (5) keeping the other treatment methods unchanged to obtain the treated neodymium-iron-boron magnet.
Example 4
A method of making a neodymium iron boron magnet as provided in example 1, except that the alloy powder used to formulate the diffusion source slurry had a composition of Tb0.3Dy0.7(Fe0.9Al0.1)2. And keeping the rest unchanged to obtain the processed neodymium iron boron magnet.
Example 5
A method of making a neodymium iron boron magnet as provided in example 1, except that the alloy powder used to formulate the diffusion source slurry had a composition of Tb0.3Dy0.7(Fe0.85Al0.15)2. And keeping the rest unchanged to obtain the processed neodymium iron boron magnet.
Comparative example 2
A method of making a neodymium iron boron magnet as provided in example 1, except that the alloy powder used to formulate the diffusion source slurry had a composition of Tb0.3Dy0.7(Fe0.8Al0.2)2. And keeping the rest unchanged to obtain the processed neodymium iron boron magnet.
Example 6
A method of making a neodymium iron boron magnet comprising the steps of:
s1: grinding and polishing the surface of a magnet with a commercial trademark of N48 by using 1500# SiC abrasive paper, and then putting the magnet into an ultrasonic cleaning machine, and removing dust and oil stains on the surface of the neodymium iron boron magnet by using an ethanol solution with the volume fraction of 2.5%; spraying a sodium chloride solution with the mass fraction of 5% on the surface of the neodymium iron boron magnet after lifting and draining, standing for 30min, and then washing the neodymium iron boron magnet with deionized water to obtain a primarily treated neodymium iron boron magnet;
s2: preparing diffusion source slurry, adding Tb0.3Dy0.7(Fe0.95Al0.05)2The alloy powder was crushed to a particle size of 1.5mm and mixed with an ethanol solution (95 vt%) in a ratio of 1 g: preparing the mixture into slurry according to the proportion of 10 mL;
s3: forming a coating layer with a thickness of 3 μm on the slurry prepared in the coating step S2 of the neodymium iron boron magnet; after the coating is solidified, simultaneously applying laser shock and ultrasonic vibration to the coating; the pulse width of the laser impact is 12ns, and the single pulse energy is 10J; the frequency of the ultrasonic vibration is 120kHz, the amplitude is 20 mu m, and the ultrasonic vibration power is 2000W; the laser shock light spot radius is 2mm, the laser shock treatment is carried out on the sintered neodymium iron boron magnet to be treated line by line, and the lap joint rate between each line is 50%;
s4: coating the slurry prepared in the step S2 on the surface of the neodymium iron boron magnet processed in the step S3 again to form a coating with the thickness of 1 μm, and after the coating is solidified, simultaneously applying laser shock and ultrasonic vibration to the coating again; the pulse width of the laser impact is 12ns, and the single pulse energy is 10J; the frequency of the ultrasonic vibration is 120kHz, the amplitude is 20 mu m, and the ultrasonic vibration power is 2000W; the laser shock light spot radius is 2mm, and the laser shock processing is carried out on the sintered neodymium iron boron magnet to be processed line by line, and the lap joint rate between each line is 50%.
And finishing the treatment to obtain the finished neodymium iron boron magnet.
Example 7
A method of making a neodymium iron boron magnet comprising the steps of:
s1: grinding and polishing the surface of a magnet with a commercial trademark of N48 by using 1500# SiC abrasive paper, and then putting the magnet into an ultrasonic cleaning machine, and removing dust and oil stains on the surface of the neodymium iron boron magnet by using an ethanol solution with the volume fraction of 2.5%; spraying a sodium chloride solution with the mass fraction of 5% on the surface of the neodymium iron boron magnet after lifting and draining, standing for 30min, and then washing the neodymium iron boron magnet with deionized water to obtain a primarily treated neodymium iron boron magnet;
s2: preparing diffusion source slurry, adding Tb0.3Dy0.7(Fe0.95Al0.05)2The alloy powder was crushed to a particle size of 1.5mm and mixed with an ethanol solution (95 vt%) in a ratio of 1 g: preparing the mixture into slurry according to the proportion of 10 mL;
s3: forming a coating layer with a thickness of 3 μm on the slurry prepared in the coating step S2 of the neodymium iron boron magnet; after the coating is solidified, simultaneously applying laser shock and ultrasonic vibration to the coating; the pulse width of the laser impact is 12ns, and the single pulse energy is 10J; the frequency of the ultrasonic vibration is 120kHz, the amplitude is 20 mu m, and the ultrasonic vibration power is 2000W; the laser shock light spot radius is 2mm, the laser shock treatment is carried out on the sintered neodymium iron boron magnet to be treated line by line, and the lap joint rate between each line is 50%;
s4: coating the slurry prepared in the step S2 on the surface of the neodymium iron boron magnet processed in the step S3 again to form a coating with the thickness of 1 μm, and after the coating is solidified, simultaneously applying laser shock and ultrasonic vibration to the coating again; the pulse width of the laser impact is 12ns, and the single pulse energy is 10J; the frequency of the ultrasonic vibration is 120kHz, the amplitude is 20 mu m, and the ultrasonic vibration power is 2000W; the laser shock light spot radius is 2mm, the laser shock treatment is carried out on the sintered neodymium iron boron magnet to be treated line by line, and the lap joint rate between each line is 50%;
repeating the process once more after the completion of the process of step S4; and finishing the treatment to obtain the finished neodymium iron boron magnet.
The neodymium iron boron magnet obtained by the treatment of the above examples 1-7 and comparative examples 1-2 is tested according to GB/T3217-.
Table 1:
the data in table 1 show that the method for preparing the neodymium iron boron magnet by adding the heavy rare earth in the coating mode can improve the coercive force of the magnet and weaken the influence on other performances of the magnet when the alloy elements are introduced.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for preparing a neodymium iron boron magnet by adding heavy rare earth in a coating mode is characterized by comprising the steps of attaching a diffusion source to the surface of a sintered neodymium iron boron magnet to form a coating, and simultaneously applying laser shock and ultrasonic vibration to the coating;
the pulse width of the laser impact is 10-15 ns, and the single pulse energy is 5-20J;
the frequency of the ultrasonic vibration is 100-150 kHz, the amplitude is 10-50 mu m, and the ultrasonic vibration power is 500-3000W;
the diffusion source is Tb0.3Dy0.7(Fe1-xAlx)2Alloy powder, wherein x is 0.05, 0.10 or 0.15;
the thickness of the coating formed on the surface of the sintered neodymium iron boron by the diffusion source is 1-5 mu m.
2. The method for preparing the ndfeb magnet by adding the heavy rare earth through the coating manner according to claim 1, wherein the method further comprises a pretreatment of the surface of the sintered ndfeb, and the pretreatment comprises: and (3) grinding, polishing and cleaning the surface of the sintered neodymium-iron-boron magnet, then spraying a sodium chloride solution on the surface of the sintered neodymium-iron-boron magnet, standing for 30 minutes and then washing.
3. The method for preparing the neodymium-iron-boron magnet by adding the heavy rare earth in the coating mode according to claim 1, wherein the laser impact has a spot radius of 2-3 mm, the laser impact treatment is performed on the sintered neodymium-iron-boron magnet to be treated line by line, and the overlapping rate between lines is 50% or more.
4. The method for preparing the neodymium-iron-boron magnet by adding the heavy rare earth in the coating mode according to claim 1, wherein the steps of forming the coating, applying laser shock and applying ultrasonic vibration are repeated for 2-3 times to obtain the treated neodymium-iron-boron magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764757.0A CN110459397B (en) | 2019-08-19 | 2019-08-19 | Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910764757.0A CN110459397B (en) | 2019-08-19 | 2019-08-19 | Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110459397A CN110459397A (en) | 2019-11-15 |
| CN110459397B true CN110459397B (en) | 2021-06-01 |
Family
ID=68487611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910764757.0A Active CN110459397B (en) | 2019-08-19 | 2019-08-19 | Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110459397B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911150B (en) * | 2019-11-28 | 2021-08-06 | 烟台首钢磁性材料股份有限公司 | Method for improving coercive force of neodymium iron boron sintered permanent magnet |
| CN110911151B (en) * | 2019-11-29 | 2021-08-06 | 烟台首钢磁性材料股份有限公司 | Method for improving coercive force of neodymium iron boron sintered permanent magnet |
| CN112635188B (en) * | 2020-12-14 | 2021-10-08 | 电子科技大学 | Method and equipment for laser cladding of heavy rare earth wire on neodymium iron boron surface |
| CN115602399A (en) * | 2021-06-28 | 2023-01-13 | 烟台正海磁性材料股份有限公司（Cn） | R-Fe-B sintered magnet and preparation method and application thereof |
| CN115101323B (en) * | 2022-07-13 | 2023-10-24 | 西安西工大思强科技股份有限公司 | Ultrasonic impact method for improving intrinsic coercivity of sintered NdFeB magnet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451673A (en) * | 2015-01-14 | 2015-03-25 | 中国石油大学(华东) | Method for preparing ultra-high hardness cladding layer through synchronous ultrasonic vibration assisting laser technology |
| CN107761094A (en) * | 2017-09-28 | 2018-03-06 | 桂林电子科技大学 | A kind of method that gradient-structure cladding layer is prepared using combination process in aluminum alloy surface |
| CN108962525A (en) * | 2018-06-25 | 2018-12-07 | 山西师范大学 | A kind of preparation method of Sintered NdFeB magnet surface layer magnetic gradient nanostructure |
| CN109465442A (en) * | 2018-11-12 | 2019-03-15 | 华中科技大学 | A kind of forging of amorphous alloy part/increasing material composite manufacturing method |
| CN109585108A (en) * | 2017-09-28 | 2019-04-05 | 日立金属株式会社 | The manufacturing method of R-T-B based sintered magnet and diffusion source |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05198451A (en) * | 1991-11-22 | 1993-08-06 | Kuroda Precision Ind Ltd | Laminated magnetic core and its manufacturing method |
| JP2001353764A (en) * | 2000-06-14 | 2001-12-25 | Bridgestone Corp | Method for extrusion-molding resin molding |
| CN108396262A (en) * | 2018-02-07 | 2018-08-14 | 河南中岳非晶新型材料股份有限公司 | A kind of high entropy magnetically soft alloy of amorphous nano-crystalline and preparation method |
-
2019
- 2019-08-19 CN CN201910764757.0A patent/CN110459397B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451673A (en) * | 2015-01-14 | 2015-03-25 | 中国石油大学(华东) | Method for preparing ultra-high hardness cladding layer through synchronous ultrasonic vibration assisting laser technology |
| CN107761094A (en) * | 2017-09-28 | 2018-03-06 | 桂林电子科技大学 | A kind of method that gradient-structure cladding layer is prepared using combination process in aluminum alloy surface |
| CN109585108A (en) * | 2017-09-28 | 2019-04-05 | 日立金属株式会社 | The manufacturing method of R-T-B based sintered magnet and diffusion source |
| CN108962525A (en) * | 2018-06-25 | 2018-12-07 | 山西师范大学 | A kind of preparation method of Sintered NdFeB magnet surface layer magnetic gradient nanostructure |
| CN109465442A (en) * | 2018-11-12 | 2019-03-15 | 华中科技大学 | A kind of forging of amorphous alloy part/increasing material composite manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110459397A (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110459397B (en) | Method for preparing neodymium iron boron magnet by adding heavy rare earth in coating mode | |
| US7824506B2 (en) | Nd-Fe-B magnet with modified grain boundary and process for producing the same | |
| CN102088215B (en) | Rotor for axial air gap-type permanent magnetic rotating machine | |
| ES2661192T3 (en) | Method of manufacturing a sintered Nd-based magnet | |
| JP5870522B2 (en) | Method for manufacturing permanent magnet | |
| CN107093516A (en) | A kind of grain boundary decision method for improving neodymium iron boron magnetic body coercivity and heat endurance | |
| JP4702549B2 (en) | Rare earth permanent magnet | |
| WO2007119553A1 (en) | Process for producing rare-earth permanent magnet material | |
| KR20060102482A (en) | Functionally graded rare earth permanent magnet | |
| KR101932551B1 (en) | RE-Fe-B BASED RARE EARTH MAGNET BY GRAIN BOUNDARY DIFFUSION OF HAEVY RARE EARTH AND MANUFACTURING METHODS THEREOF | |
| CN105551707A (en) | Neodymium iron boron magnet raw material powder and treatment process therefor | |
| CN102088225A (en) | Manufacturing method of a rotor in a machine comprising embedded permanent magnets | |
| CN104321838B (en) | Neodymium base rare earth element permanent magnet and its manufacture method | |
| CN108417380A (en) | A kind of low cost diffusion source alloy and grain boundary decision magnet and preparation method thereof | |
| CN101901658B (en) | Sintered NdFeB rare-earth permanent magnet material with modified grain boundary phase and preparation method thereof | |
| CN106783124A (en) | A kind of grain boundary decision Al Cu alloys improve the corrosion proof method of neodymium iron boron magnetic body | |
| US20150357100A1 (en) | Nanocomposite magnet and method of producing the same | |
| CN111081443A (en) | R-T-B series permanent magnetic material and preparation method and application thereof | |
| WO2019227664A1 (en) | Laser shock processing method for improving corrosion resistance property of sintered nd-fe-b magnet | |
| JPH02139907A (en) | Manufacture of pole anisotropic rare earth magnet | |
| CN110556243B (en) | Neodymium iron boron surface dysprosium penetration method | |
| CN108335898A (en) | A kind of sintered NdFeB sheet magnet steel temperature stability of improving oozes dysprosium technique | |
| CN111210962B (en) | Sintered neodymium iron boron containing SmFeN or SmFeC and preparation method thereof | |
| KR20190061244A (en) | Method for preparing rare-earth permanent magnet | |
| CN109326404B (en) | Neodymium-iron-boron magnetic material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |