CN110459397A - A method of neodymium iron boron magnetic body is prepared using coating method addition heavy rare earth - Google Patents
A method of neodymium iron boron magnetic body is prepared using coating method addition heavy rare earth Download PDFInfo
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- CN110459397A CN110459397A CN201910764757.0A CN201910764757A CN110459397A CN 110459397 A CN110459397 A CN 110459397A CN 201910764757 A CN201910764757 A CN 201910764757A CN 110459397 A CN110459397 A CN 110459397A
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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
- H01F1/0577—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
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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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- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention belongs to neodymium iron boron magnetic body technical fields, especially a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, the method includes will spread source to be attached to after Sintered NdFeB magnet surface forms coating, to the coating while applying laser-impact and ultrasonic vibration；The present invention is by way of laser-impact and ultrasonic vibration, it is ensured that the alloy compositions for spreading source, which adequately infiltrate into the gap of neodymium iron boron magnetic body, to be made improvements, so that the neodymium iron boron magnetic body has preferable coercivity；Furthermore, based on laser-impact and ultrasonic vibration this processing mode, diffusion source alloy compositions show preferable compactness in the gap of neodymium iron boron magnetic body, and, the Grain-Boundary Phase physico-chemical property on neodymium iron boron magnetic body surface significantly improves, to improve the comprehensive performance of neodymium iron boron magnetic body, this improvement, which counteracts, introduces alloy mode bring to the decrease of other performances of neodymium iron boron magnetic body.
Description
Technical field
It is especially a kind of to prepare neodymium iron using coating method addition heavy rare earth the invention belongs to neodymium iron boron magnetic body technical field
The method of boron magnet.
Background technique
The advantages that sintered Nd-Fe-B permanent magnet is high, manufacture craft is simple, low in cost with its magnetic property, is widely used in
The fields such as small and special electric machine, magnetic separating apparatus, magnetic machinery, magnetic resonance imaging device.But as the temperature rises, coercive
Power declines rapidly, and coercitive reduction increases the flux irreversible loss of magnet at relatively high temperatures, and anti-outfield perturbed force is big
It is big to reduce.Coercivity is an important performance characteristic of such magnet.
Traditional coercitive means of promotion Sintered NdFeB magnet are that heavy rare earth element is added in melting to improve crystalline substance
The anisotropy field of grain, to improve coercivity.Be limited to heavy rare earth resource scarcity, from the aspect of cost, heavy rare earth it is intensive
Change using being urgent problem to be solved instantly.In recent years, side of the grain boundary decision heavy rare earth as a kind of intensive utilization heavy rare earth
Method has obtained extensive research, and grain boundary decision heavy rare earth refers to the weight for adhering to Sintered NdFeB magnet surface by heat treatment process
Technique of the rare earth element inside the grain boundary decision to Sintered NdFeB magnet of melting.By grain boundary diffusion process, weight can be made
For rare earth integrated distribution near Sintered NdFeB magnet crystal boundary, heavy rare earth dosage is few, but can be obviously improved coercivity, avoids simultaneously
Remanent magnetism is greatly reduced, and therefore, the method that heavy rare earth element is added when compared to traditional melting, grain boundary decision method is more advantageous to
The Sintered NdFeB magnet of high combination property is obtained, and realizes heavy rare earth intensive utilization.Such as application No. is
The Chinese patent application of " 201711416008.6 " disclose it is a kind of improved using grain boundary decision Sintered NdFeB magnet rectify
The method of stupid power, method include that will spread source to be attached to Sintered NdFeB magnet surface formation coating, are then carried out at dehydrogenation
Reason, is finally diffused processing to coating, obtains the Sintered NdFeB magnet that infiltration has heavy rare earth element；This technical solution
Implement to increase dependent on the activity of the hydride powder for the R1-R2-M type alloy for constituting coating after Dehydroepiandrosterone derivative, that is, must lead to
It crosses Dehydroepiandrosterone derivative just and can ensure that heavy rare earth element in effective diffusion on Sintered NdFeB magnet surface, reaches and improves coercitive work
With.In addition, the above-mentioned method using grain boundary decision equally can be in sintered NdFeB magnetic based on known to a person skilled in the art
Alloying element is introduced in body, in this way, to a certain extent, other performance indicators of the Sintered NdFeB magnet still can be reduced,
Such as magnetic energy product etc..
In this way, developing one kind can be improved magnet coercivity, while the method that reduction influences other performances of magnet becomes
The technical issues of those skilled in the art's urgent need to resolve.
Summary of the invention
Sintered NdFeB magnet coercivity can be improved the purpose of the present invention is to provide one kind and is reduced to sintering neodymium
The method that other performances of iron boron magnet influence.
To achieve the goals above, the present invention is achieved by the following scheme:
The present invention provides a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, the methods
Including will spread source be attached to Sintered NdFeB magnet surface formed coating after, to the coating simultaneously apply laser-impact and
Ultrasonic vibration.
In the present invention, laser-impact can generate heat, penetrate into neodymium iron boron magnetic body after melting the diffusion source in coating
In, induce diffusion source alloy to infiltrate into deeper depth in the way of ultrasonic vibration, to the deep place of neodymium iron boron magnetic body
Crystal boundary improves, and thereby further ensures that its coercivity with higher.Meanwhile superpower impact caused by the laser-impact
Wave energy enough changes the crystal boundary phase constituent and structure on neodymium iron boron magnetic body surface, improves Grain-Boundary Phase physico-chemical property, improves neodymium iron boron magnetic body
The compactness extent on surface, to improve the comprehensive performance of neodymium iron boron magnetic body；Weaken the mode of the introducing alloy to neodymium-iron-boron
Other performances of body, such as the influence of magnetic energy product.
According to the present invention, in the present invention, the parameter of the laser-impact can select in a wider scope, as preferred
, the pulse width of the laser-impact is 10~15ns, and single pulse energy is 5~20J.
In the present invention, the purpose of ultrasonic vibration is to promote the diffusion source alloy after laser-impact melts to infiltrate into neodymium iron
The deeper position of boron magnet, so that it is guaranteed that the coercitive raising of the neodymium iron boron magnetic body.The parameter of the ultrasonic vibration can compared with
Selection in wide range, preferably, the frequency of the ultrasonic vibration is 100~150kHz, amplitude is 10~50 μm, ultrasound
Oscillation power is 500~3000W.
According to the present invention, in the present invention, in order to avoid introducing sundries, the neodymium iron boron magnetic body is forming coating and laser
Impact carries out pretreatment operation before ultrasonic vibration, specifically, the pretreatment include: to Sintered NdFeB magnet surface into
Row polishing, polishing and cleaning treatment, then spray sodium chloride solution to Sintered NdFeB magnet surface, rinse after standing 30 minutes
Completely.More specifically, it is polished using the SiC sand paper of 1000# to 2000# neodymium iron boron magnetic body surface, polishing treatment, so
Afterwards with being put into supersonic wave cleaning machine, it is aided with the ethanol solution that volume fraction is 2.5%, removes the dust on neodymium iron boron magnetic body surface
And grease stain.The purpose of sprinkling sodium chloride solution is to form faint corrosion on the surface of neodymium iron boron magnetic body, obtains being located at surface layer
The atom vacancy of grain boundaries or gap are invaded in this way, diffusion source alloy is easier to permeate in laser-impact and the condition of ultrasonic vibration
Enter to inside neodymium iron boron magnetic body.The present invention does not do particular determination to the concentration of the sodium chloride solution, is specifically as follows quality point
The sodium chloride solution of number 5%.
In the present invention, the diffusion source is Tb0.3Dy0.7(Fe1-xAlx)2Alloy powder, wherein x value be 0.05,
0.10 or 0.15；The partial size of the alloy powder is 1-2mm.The grain boundaries in neodymium-iron-boron body are infiltrated by the alloy compositions,
The coercivity of the neodymium iron boron magnetic body can effectively be improved；Meanwhile by being compounded with Al element in alloy compositions, though to it is each to
The opposite sex decreases, but the position of the part Fe based on the replacement of Al element, improves the resistivity and compression strength of alloy, and
And based on the compound of Al element, the diffusion source can be promoted to infiltrate into deeper position, and then improve the neodymium iron boron magnetic body
Coercivity.
In the present invention, the diffusion source is unsuitable blocked up in the thickness that Sintered NdFeB magnet surface forms coating, if blocked up,
It is be easy to cause the waste of heavy rare earth element, and it is excessively thin, the heavy rare earth element of sufficient amount can not be also provided to improve neodymium iron boron magnetic body.
Preferably, the diffusion source is in sintered NdFeB surface formation coating with a thickness of 1~5 μm in the present invention.
According to the present invention, in the present invention, the spot radius of the laser-impact is 2~3mm, in sintered NdFeB to be processed
Laser-impact processing is carried out on magnet line by line, and each overlapping rate in the ranks is 50% or more.In the specific implementation process, will swash
Beam and focus center is overlapped with the neodymium iron boron magnetic body surface to be processed upper left corner, as the initial position of laser-impact, in this way, line by line
Shock treatment is carried out to the surface of neodymium iron boron magnetic body, also, in order to obtain better impact effect, respectively overlap joint impact in the ranks,
I.e. under impact a line when, shock treatment, overlapping rate are 50% or more again in the region impacted to lastrow, it is ensured that good
Impact effect.
The present invention also provides a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, the sides
Method includes will spread source to be attached to after Sintered NdFeB magnet surface forms coating, to the coating while applying laser-impact
And ultrasonic vibration；Step 2-3 times for being repeatedly formed coating, applying laser-impact and ultrasonic vibration, the neodymium iron boron that obtains that treated
Magnet.In the technical scheme, by duplicate formation coating, application laser-impact and ultrasonic vibration, so that the diffusion source exists
The structure at multilayer interface is formed in the gap of neodymium iron boron magnetic body, also, duplicate impact is so that the diffusion source alloy impacted at first
There is better compactness extent in neodymium-iron-boron body, to further improve the neodymium iron boron magnetic body with more efficient coercive
Power.
Compared with prior art, the present invention has following technical effect that
1, the method provided by the invention for preparing neodymium iron boron magnetic body, by way of laser-impact and ultrasonic vibration, it is ensured that
The alloy compositions in diffusion source are adequately infiltrated into the gap of neodymium iron boron magnetic body and are made improvements, so that the neodymium iron boron magnetic body
With preferable coercivity；In addition, spreading source alloy compositions in neodymium iron based on laser-impact and ultrasonic vibration this processing mode
Preferable compactness is shown in the gap of boron magnet, moreover, the Grain-Boundary Phase physico-chemical property on neodymium iron boron magnetic body surface obtains significantly
Improve, to improve the comprehensive performance of neodymium iron boron magnetic body, this improvement, which counteracts, introduces alloy mode bring to neodymium iron boron
The decrease of other performances of magnet.
2, the method provided by the invention for preparing neodymium iron boron magnetic body, handles the expansion in coating by way of the laser-impact
Source alloy compositions are dissipated, have achieved the purpose that refine crystal grain, the gas in material is eliminated and reduces being mingled with for oxide, significantly
The fatigue life for improving the neodymium iron boron magnetic body.
3, the method provided by the invention for preparing neodymium iron boron magnetic body passes through the cooperation of laser-impact and ultrasonic vibration, diffusion
The penetration depth of source alloy compositions is deep, without the step of carrying out tempering after treatment.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is furture elucidated.
The present invention provides a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, the methods
Including will spread source be attached to Sintered NdFeB magnet surface formed coating after, to the coating simultaneously apply laser-impact and
Ultrasonic vibration.
In the present invention, spread source preparation method be by raw material Tb, Dy, Fe, Al (Tb:99.99%, Dy:99.9%,
Fe:99.98%, Al:99.9%) target component is configured to as Tb0.3Dy0.7(Fe1-xAlx)2Alloy；Wherein, x value is
0.05,0.10 or 0.15；In specific preparation method, excessive Tb and Dy is added by 5% scaling loss to compensate positive hair loss, utilizes
High vacuum non-consumable electric arc melting equipment casts alloy to inhaling after sample melting, then to the conjunction under high-purity argon gas shielded
Gold is crushed to obtain the alloy powder that partial size is 1-2mm, is modulated into slurry followed by ethanol solution, wherein every 1g
Alloy powder and 10mL ethanol solution (95vt%) cooperate.
Hereinafter, use the commercial trade mark for the magnet of N48, having a size ofBy specific embodiment to this hair
The method for preparing neodymium iron boron magnetic body of bright offer makes further instructions.
Embodiment 1
A method of preparing neodymium iron boron magnetic body, comprising the following steps:
S1: the SiC sand paper of 1500# is used to polish the commercial trade mark for the magnet surface of N48, polishing treatment, then
It is put into supersonic wave cleaning machine, is aided with the ethanol solution that volume fraction is 2.5%, remove the dust and oil on neodymium iron boron magnetic body surface
Stain；Lift the sodium chloride solution for being 5% to the surface of neodymium iron boron magnetic body sprinkling mass fraction after draining, is spent after standing 30min
Ionized water is rinsed well, and the good neodymium iron boron magnetic body of preliminary treatment is obtained；
S2: diffusion source slurry is prepared, by Tb0.3Dy0.7(Fe0.95Al0.05)2It is 1.5mm that alloy powder, which is crushed to partial size, with
Ethanol solution (95vt%) is modulated to form slurry according to the ratio of 1g:10mL；
S3: the slurry being prepared in the coating step S2 of neodymium iron boron magnetic body forms the coating with a thickness of 3 μm；To this
After coating solidification, laser-impact and ultrasonic vibration are applied simultaneously to coating；The pulse width of the laser-impact is 12ns, single
Pulse energy is 10J；The frequency of the ultrasonic vibration is 120kHz, and amplitude is 20 μm, and ultrasonic vibration power is 2000W；
The spot radius of laser-impact is 2mm, carries out laser-impact processing line by line on Sintered NdFeB magnet to be processed,
And each overlapping rate in the ranks is 50%.The neodymium iron boron magnetic body completed to get processing is completed in processing.
Embodiment 2
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, in step S3, the slurry is in neodymium iron
The coating layer thickness that boron magnet surface is formed is 1 μm；Remaining processing method is constant, the neodymium iron boron magnetic body handled well.
Embodiment 3
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, in step S3, the slurry is in neodymium iron
The coating layer thickness that boron magnet surface is formed is 5 μm；Remaining processing method is constant, the neodymium iron boron magnetic body handled well.
Comparative example 1
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, in step S3, the slurry is in neodymium iron
The coating layer thickness that boron magnet surface is formed is 0.5 μm；Remaining processing method is constant, the neodymium iron boron magnetic body handled well.
Embodiment 4
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, for preparing the alloy of diffusion source slurry
The ingredient of powder is Tb0.3Dy0.7(Fe0.9Al0.1)2.Remaining is constant, the neodymium iron boron magnetic body handled well.
Embodiment 5
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, for preparing the alloy of diffusion source slurry
The ingredient of powder is Tb0.3Dy0.7(Fe0.85Al0.15)2.Remaining is constant, the neodymium iron boron magnetic body handled well.
Comparative example 2
As embodiment 1 provide the method for preparing neodymium iron boron magnetic body, unlike, for preparing the alloy of diffusion source slurry
The ingredient of powder is Tb0.3Dy0.7(Fe0.8Al0.2)2.Remaining is constant, the neodymium iron boron magnetic body handled well.
Embodiment 6
A method of preparing neodymium iron boron magnetic body, comprising the following steps:
S1: the SiC sand paper of 1500# is used to polish the commercial trade mark for the magnet surface of N48, polishing treatment, then
It is put into supersonic wave cleaning machine, is aided with the ethanol solution that volume fraction is 2.5%, remove the dust and oil on neodymium iron boron magnetic body surface
Stain；Lift the sodium chloride solution for being 5% to the surface of neodymium iron boron magnetic body sprinkling mass fraction after draining, is spent after standing 30min
Ionized water is rinsed well, and the good neodymium iron boron magnetic body of preliminary treatment is obtained；
S2: diffusion source slurry is prepared, by Tb0.3Dy0.7(Fe0.95Al0.05)2It is 1.5mm that alloy powder, which is crushed to partial size, with
Ethanol solution (95vt%) is modulated to form slurry according to the ratio of 1g:10mL；
S3: the slurry being prepared in the coating step S2 of neodymium iron boron magnetic body forms the coating with a thickness of 3 μm；To this
After coating solidification, laser-impact and ultrasonic vibration are applied simultaneously to coating；The pulse width of the laser-impact is 12ns, single
Pulse energy is 10J；The frequency of the ultrasonic vibration is 120kHz, and amplitude is 20 μm, and ultrasonic vibration power is 2000W；Laser
The spot radius of impact is 2mm, carries out laser-impact processing line by line on Sintered NdFeB magnet to be processed, and respectively in the ranks overlap
Rate is 50%；
S4: the slurry being prepared in the neodymium iron boron magnetic body surface that step S3 processing is completed again coating step S2, shape
At the coating with a thickness of 1 μm, after solidification to be coated, laser-impact and ultrasonic vibration are applied simultaneously to coating again；The laser
The pulse width of impact is 12ns, and single pulse energy is 10J；The frequency of the ultrasonic vibration is 120kHz, and amplitude is 20 μm,
Ultrasonic vibration power is 2000W；The spot radius of laser-impact is 2mm, is carried out line by line on Sintered NdFeB magnet to be processed
Laser-impact processing, and each overlapping rate in the ranks is 50%.
The neodymium iron boron magnetic body completed to get processing is completed in processing.
Embodiment 7
A method of preparing neodymium iron boron magnetic body, comprising the following steps:
S1: the SiC sand paper of 1500# is used to polish the commercial trade mark for the magnet surface of N48, polishing treatment, then
It is put into supersonic wave cleaning machine, is aided with the ethanol solution that volume fraction is 2.5%, remove the dust and oil on neodymium iron boron magnetic body surface
Stain；Lift the sodium chloride solution for being 5% to the surface of neodymium iron boron magnetic body sprinkling mass fraction after draining, is spent after standing 30min
Ionized water is rinsed well, and the good neodymium iron boron magnetic body of preliminary treatment is obtained；
S2: diffusion source slurry is prepared, by Tb0.3Dy0.7(Fe0.95Al0.05)2It is 1.5mm that alloy powder, which is crushed to partial size, with
Ethanol solution (95vt%) is modulated to form slurry according to the ratio of 1g:10mL；
S3: the slurry being prepared in the coating step S2 of neodymium iron boron magnetic body forms the coating with a thickness of 3 μm；To this
After coating solidification, laser-impact and ultrasonic vibration are applied simultaneously to coating；The pulse width of the laser-impact is 12ns, single
Pulse energy is 10J；The frequency of the ultrasonic vibration is 120kHz, and amplitude is 20 μm, and ultrasonic vibration power is 2000W；Laser
The spot radius of impact is 2mm, carries out laser-impact processing line by line on Sintered NdFeB magnet to be processed, and respectively in the ranks overlap
Rate is 50%；
S4: the slurry being prepared in the neodymium iron boron magnetic body surface that step S3 processing is completed again coating step S2, shape
At the coating with a thickness of 1 μm, after solidification to be coated, laser-impact and ultrasonic vibration are applied simultaneously to coating again；The laser
The pulse width of impact is 12ns, and single pulse energy is 10J；The frequency of the ultrasonic vibration is 120kHz, and amplitude is 20 μm,
Ultrasonic vibration power is 2000W；The spot radius of laser-impact is 2mm, is carried out line by line on Sintered NdFeB magnet to be processed
Laser-impact processing, and each overlapping rate in the ranks is 50%；
It is repeated after the completion of step S4 processing primary；The neodymium iron boron magnetic body completed to get processing is completed in processing.
According to GB/T 3217-2013 " magnetic test method for permanent magnetic (hard magnetic) material " to above-described embodiment 1-7, comparative example
The neodymium iron boron magnetic body that 1-2 is handled is tested, and the data tested are as shown in table 1.
Table 1:
It can be seen that utilization coating method addition heavy rare earth provided by the invention in conjunction with data in table 1 and prepare neodymium-iron-boron
The method of body can be improved the coercivity of magnet, and weaken influence when introducing alloying element to other performances of the magnet.
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (8)
1. a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, which is characterized in that the method packet
It includes after diffusion source is attached to Sintered NdFeB magnet surface formation coating, apply laser-impact simultaneously to the coating and surpasses
Acoustic vibration.
2. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the pulse width of the laser-impact is 10~15ns, and single pulse energy is 5~20J.
3. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the frequency of the ultrasonic vibration is 100~150kHz, and amplitude is 10~50 μm, and ultrasonic vibration power is 500~3000W.
4. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the method further includes pre-processing to sintered NdFeB surface, and the pretreatment includes: to sintered NdFeB magnetic
Body surface face polished, is polished and cleaning treatment, is then sprayed sodium chloride solution to Sintered NdFeB magnet surface, is stood 30 points
It is rinsed well after clock.
5. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the diffusion source is Tb0.3Dy0.7(Fe1-xAlx)2Alloy powder, wherein x value is 0.05,0.10 or 0.15；
The partial size of the alloy powder is 1-2mm.
6. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the diffusion source is in sintered NdFeB surface formation coating with a thickness of 1~5 μm.
7. the method according to claim 1 for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, feature exist
In the spot radius of the laser-impact is 2~3mm, is carried out at laser-impact line by line on Sintered NdFeB magnet to be processed
Reason, and each overlapping rate in the ranks is 50% or more.
8. a kind of method for preparing neodymium iron boron magnetic body using coating method addition heavy rare earth, which is characterized in that the method packet
It includes after diffusion source is attached to Sintered NdFeB magnet surface formation coating, apply laser-impact simultaneously to the coating and surpasses
Acoustic vibration；Step 2-3 times for being repeatedly formed coating, applying laser-impact and ultrasonic vibration, the neodymium iron boron magnetic body that obtains that treated.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911151A (en) * | 2019-11-29 | 2020-03-24 | 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 |
| CN112635188A (en) * | 2020-12-14 | 2021-04-09 | 电子科技大学 | Method and equipment for laser cladding of heavy rare earth wire on neodymium iron boron surface |
| EP3828903A1 (en) * | 2019-11-28 | 2021-06-02 | Yantai Shougang Magnetic Materials Inc. | A method for increasing the coercivity of a sintered type ndfeb permanent magnet |
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