CN108109833A - A kind of method that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method - Google Patents
A kind of method that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method Download PDFInfo
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- CN108109833A CN108109833A CN201711381295.1A CN201711381295A CN108109833A CN 108109833 A CN108109833 A CN 108109833A CN 201711381295 A CN201711381295 A CN 201711381295A CN 108109833 A CN108109833 A CN 108109833A
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- rare
- earth permanent
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/02—Electrophoretic coating characterised by the process with inorganic material
Abstract
The embodiment of the invention discloses a kind of methods that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, comprise the following steps：Rare-earth permanent magnet workpiece is placed in the electrophoresis groove liquid containing heavy rare earth element, electrophoretic process is carried out to rare-earth permanent magnet workpiece, the surface of rare-earth permanent magnet workpiece is made to form one layer of electrophoresis layer containing heavy rare earth element；Heavy rare earth element infiltration processing is carried out to the rare-earth permanent magnet workpiece after electrophoretic process；Treated rare-earth permanent magnet workpiece will be permeated through heavy rare earth element carry out ageing treatment；Rare-earth permanent magnet workpiece after ageing treatment is subjected to air quenching processing, so as to which heavy rare earth element is made to penetrate into workpiece, improves the intrinsic coercivity of rare-earth permanent magnet workpiece.
Description
Technical field
It is more particularly to a kind of that high-performance rare-earth is produced forever by grain boundary decision method the present invention relates to technical field of magnetic materials
The method of magnet.
Background technology
Rare-earth permanent magnet is a kind of magnetic material containing rare earth element, has the characteristics that be not easy loss of excitation, usually by rare earth
Element, iron, cobalt and boron are formed after sintering.The workpiece as made from rare-earth permanent magnet is widely used in electronics, machinery field.
When the prior art prepares rare-earth permanent magnet workpiece, it will usually coat one layer of painting containing heavy rare earth element on its surface
Then layer material is handled through infiltration, so as to improve the intrinsic coercivity of rare-earth permanent magnet workpiece.Coating above-mentioned coating material
When, when the heavy rare earth element in coating material is its metal simple-substance, generally use vacuum sputtering, when the weight in coating material
When rare earth element is the fluoride of rare earth element, oxide, generally use spread coating or dip coating.Wherein, spread coating is will to apply
Layer material is brushed forms coating in rare-earth permanent magnet workpiece surface, and dip coating is by rare-earth permanent magnet workpiece immersion coating material
In, coating is formed after taking-up.
The content of the invention
The embodiment of the invention discloses a kind of methods that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, can make
The surface of rare-earth permanent magnet workpiece forms one layer of coating containing heavy rare earth element, so as to carry out infiltration processing to workpiece.Technology
Scheme is as follows：
Rare-earth permanent magnet workpiece is placed in the electrophoresis groove liquid containing heavy rare earth element, to the rare-earth permanent magnet workpiece into
Row electrophoretic process makes the surface of the rare-earth permanent magnet workpiece form one layer of electrophoresis layer containing heavy rare earth element；
Heavy rare earth element infiltration processing is carried out to the rare-earth permanent magnet workpiece after electrophoretic process；
Treated rare-earth permanent magnet workpiece will be permeated through heavy rare earth element carry out ageing treatment；
Rare-earth permanent magnet workpiece after ageing treatment is subjected to air quenching processing.
Wherein, the electrophoresis groove liquid containing heavy rare earth element, fluoride, oxide comprising heavy rare earth element are at least
A kind of formed penetrant and resinous substrates.
Wherein, in the electrophoresis groove liquid, the mass ratio of penetrant and resinous substrates is 25~45 mass parts：100 mass parts.
Wherein, 50~180 volts of the electrophoretic voltage of the electrophoretic process, electrophoresis time 10~1000 seconds, electrophoresis groove liquid temperature
The distance of 20~36 DEG C, workpiece and cathode or anode is 5~200cm.
Wherein, the fluoride of the heavy rare earth element, the average grain diameter of oxide are not more than 2mm.
Wherein, the heavy rare earth element is selected from at least one of following element：Dysprosium, terbium and holmium.
Wherein, the thickness of the electrophoresis layer is 2~30um.
Wherein, the infiltration temperature of the infiltration processing is 600~900 DEG C, when time of penetration is 0.5~20 small.
Wherein, the holding temperature of the ageing treatment is 400~600 DEG C, when soaking time is 2~20 small.
Wherein, air quenching processing is carried out to rare-earth permanent magnet workpiece using argon gas or nitrogen.
An embodiment of the present invention provides it is a kind of by grain boundary decision method produce high-performance rare-earth permanent-magnetic body method, pass through by
Rare-earth permanent magnet workpiece is placed in the electrophoresis groove liquid containing heavy rare earth element, is carried out electrophoretic process to rare-earth permanent magnet workpiece, is made
The surface of rare-earth permanent magnet workpiece forms one layer of coating containing heavy rare earth element, so as to be oozed to rare-earth permanent magnet workpiece
Thoroughly during processing, heavy rare earth element can be made to penetrate into workpiece, improve the intrinsic coercivity of rare-earth permanent magnet workpiece.
Specific embodiment
Rare-earth permanent magnet raw material are typically passed through melting by existing rare-earth permanent magnet workpiece, after alloy pig is made, then
Rare-earth permanent magnet blank, machined obtained rare-earth permanent magnet is made through processes such as hydrogen is broken, airflow milling, pressing under magnetic field, sintering
Workpiece, then using sputtering vacuum process, form one layer of heavy rare earth element simple substance coating in workpiece surface or using brushing or
Dipping process forms one layer of fluoride containing heavy rare earth element, oxide in workpiece surface, then carries out heavy rare earth to the workpiece
Element infiltration processing (i.e. grain boundary decision is handled).
Although existing rare-earth permanent magnet workpiece has been able to be formed by vacuum sputtering or brushing or dipping process and apply
Layer, but since the coating layer thickness formed on each surface of workpiece is not uniform enough, when carrying out infiltration processing to workpiece, penetrate into
The heavy rare-earth element content of workpiece can also be affected, therefore promote the intrinsic coercivity of rare-earth permanent magnet workpiece and be subject to shadow
It rings.Also, existing brushing or dipping process are difficult to be applied to the dead angle of workpiece, and the machine cost of vacuum sputtering, are produced into
This height.
In order to eliminate above-mentioned problem, high-performance is produced by grain boundary decision method an embodiment of the present invention provides one kind
The method of rare-earth permanent magnet more particularly to a kind of surface treatment method of rare-earth permanent magnet workpiece, specifically include：
Rare-earth permanent magnet workpiece is placed in the electrophoresis groove liquid containing heavy rare earth element, electricity is carried out to rare-earth permanent magnet workpiece
Swimming is handled, and the surface of rare-earth permanent magnet workpiece is made to be formed uniformly one layer of coating containing heavy rare earth element.
Inventor carries out electrophoretic process the study found that by the way that rare-earth permanent magnet workpiece is placed in electrophoresis groove liquid to workpiece,
The electrophoresis layer that workpiece can be made to be formed uniformly one layer.By the way that the mill base ingredient replacement in electrophoresis groove liquid (i.e. electrophoretic paint) is attached most importance to
Fluoride, the oxide of rare earth element, after electrophoretic process is carried out to rare-earth permanent magnet workpiece, electrophoresis that workpiece surface is formed
Contain heavy rare earth element in layer.It should be noted that, although electrophoresis process belongs to the prior art, but the present invention is compared with existing
Process of surface treatment for, one is that it is possible to formation one everywhere in rare-earth permanent magnet workpiece surface the advantages of critically important
Layer thickness is uniform and the electrophoresis layer containing heavy rare earth element.
Electrophoresis groove liquid usually can be by will be oozed by the fluoride of heavy rare earth element, at least one formed of oxide
Saturating object obtains after being mixed with resinous substrates, wherein, heavy rare earth element can be dysprosium, terbium and holmium, and fluoride includes but unlimited
In：Dysprosium fluoride, fluorination terbium and holmium fluoride；Oxide includes but not limited to：Dysprosia, terbium oxide and holimium oxide.Resinous substrates bag
It includes but is not limited to：Epoxy resin, polyacrylic resin.Wherein, the mass ratio of penetrant and resinous substrates is 25~45 mass parts：
100 mass parts.
50~180 volts of electrophoretic voltage, the electrophoresis time 10~1000 seconds of electrophoretic process, 20~36 DEG C of electrophoresis groove liquid temperature,
The distance of workpiece and cathode or anode is 5~200cm, electrophoresis number 1~5 time, the thickness of the electrophoresis layer formed for 2~
30um。
Anodic electrophoresis process may be employed in the present invention, ability cathode electrophoresis technique can also be used, when using ability cathode electrophoresis technique
When, select cationic cataphoresis tank liquor, by rare-earth permanent magnet workpiece as cathode near；When using anodic electrophoresis process, choosing
With anionic electrophoresis groove liquid, by rare-earth permanent magnet workpiece as anode near.And it is possible to workpiece using at multiple electrophoresis
Reason, so as to improve electrophoresis layer thickness.
Optionally, the fluoride of the heavy rare earth element in the present invention, the average grain diameter of oxide are preferably no more than 2mm
No more than 1mm, so as to effectively be attached to workpiece surface.
It is alternatively possible to using vacuum infiltration stove to the infiltration of rare-earth permanent magnet workpiece handle, control infiltration temperature be 600~
900 DEG C, when time of penetration is 0.5~20 small, heavy rare earth element is made to penetrate into the grain structure of rare-earth permanent magnet workpiece.
Rare-earth permanent magnet workpiece in the present invention when its surface is less than 15mm there are one the thickness in direction, can ensure
Good osmotic effect.
After handling the infiltration of rare-earth permanent magnet workpiece, ageing treatment can be carried out to rare-earth permanent magnet workpiece, so as to disappear
Except the internal stress of rare-earth permanent magnet workpiece, rare-earth permanent magnet workpiece is reduced because of the cracking possibility of internal stress.Specifically, when
The holding temperature of effect processing is 400~600 DEG C, when soaking time is 2~20 small.
Inventor carries out timeliness the study found that since rare-earth permanent magnet workpiece is generally in irregular shape, and hard texture is crisp
, may be uneven due to radiating if Slow cooling at room temperature after processing, there is slight deformation phenomenon；And if using
Liquid quenching method (such as oil or water-soluble medium), cooldown rate is too fast, and workpiece, which drastically cools down, easily to crack.
Air quenching processing is carried out to the rare-earth permanent magnet workpiece after ageing treatment using argon gas or nitrogen, can be significantly reduced dilute
The deformation quantity of native permanent magnet workpiece.On the one hand, air quenching processing can make the heat dissipation of rare-earth permanent magnet workpiece more uniform, be less prone to
Deformation reduces the rejection rate of workpiece；On the other hand, the cooling velocity of air quenching processing is moderate, does not easily cause rare-earth permanent magnet work
Part cracks, and improves the yield rate of rare-earth permanent magnet workpiece.
The technical solution in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiments obtained without creative efforts belong to the model that the present invention protects
It encloses.
Embodiment 1
The rare-earth permanent magnet blockage that two specifications are 30*20*3 (mm) is taken, which is by the trade mark
The sintered NdFeB blank of N48 is cut.After two rare-earth permanent magnet blockage surface treatments are clean, by one of rare earth
Permanent magnet blockage is placed in the electrophoresis groove liquid containing terbium oxide, and ability cathode electrophoresis processing is carried out to rare-earth permanent magnet blockage,
In, terbium oxide average grain diameter is 0.52um, and the mass ratio of penetrant and resinous substrates is 30 mass parts in electrophoresis groove liquid：100 matter
Measure part, 100 volts of electrophoretic voltage, the electrophoresis time 500 seconds of electrophoretic process, 28 DEG C of electrophoresis groove liquid temperature, the distance of workpiece and cathode
For 10cm, using secondary electrophoresis, its surface is made to form the electrophoresis layer that thickness is 10um；By the rare-earth permanent magnet after electrophoretic process
Blockage is put into vacuum infiltration stove and carries out heavy rare earth element infiltration processing, permeates 900 DEG C of temperature, time of penetration 5h；It will be dilute through weight
Earth elements infiltration treated rare-earth permanent magnet blockage carries out ageing treatment, 500 DEG C for the treatment of temperature, when soaking time 3 is small；So
The rare-earth permanent magnet blockage after ageing treatment is subjected to air quenching processing using argon gas afterwards.
Embodiment 2
The rare-earth permanent magnet blockage that two specifications are 30*20*3 (mm) is taken, which is by the trade mark
The sintered NdFeB blank of N48 is cut.After two rare-earth permanent magnet blockage surface treatments are clean, by one of rare earth
Permanent magnet blockage is placed in the electrophoresis groove liquid containing dysprosia, and ability cathode electrophoresis processing is carried out to rare-earth permanent magnet blockage,
In, dysprosia average grain diameter is 0.52um, and the mass ratio of penetrant and resinous substrates is 30 mass parts in electrophoresis groove liquid：100 matter
Measure part, 100 volts of electrophoretic voltage, the electrophoresis time 500 seconds of electrophoretic process, 28 DEG C of electrophoresis groove liquid temperature, the distance of workpiece and cathode
For 10cm, using secondary electrophoresis, its surface is made to form the electrophoresis layer that thickness is 10um；By the rare-earth permanent magnet after electrophoretic process
Blockage is put into vacuum infiltration stove and carries out heavy rare earth element infiltration processing, permeates 900 DEG C of temperature, time of penetration 5h；It will be dilute through weight
Earth elements infiltration treated rare-earth permanent magnet blockage carries out ageing treatment, 500 DEG C for the treatment of temperature, when soaking time 3 is small；So
The rare-earth permanent magnet blockage after ageing treatment is subjected to air quenching processing using argon gas afterwards.
Embodiment 3
The rare-earth permanent magnet blockage that a specification is 30*20*3 (mm) is taken, which is by the trade mark
The sintered NdFeB blank of N48 is cut.After the surface treatment totally of rare-earth permanent magnet blockage, it is placed in by terbium oxide and oxygen
In the penetrant electrophoresis groove liquid for changing dysprosium composition, ability cathode electrophoresis processing is carried out to rare-earth permanent magnet blockage, wherein, terbium oxide and oxygen
Change the average grain diameter of dysprosium as 10um, the mass ratio of penetrant and resinous substrates is 25 mass parts in electrophoresis groove liquid：100 mass parts,
50 volts of electrophoretic voltage, the electrophoresis time 1000 seconds of electrophoretic process, 36 DEG C of electrophoresis groove liquid temperature, the distance of workpiece and cathode are 5cm,
Using an electrophoresis, its surface is made to form the electrophoresis layer that thickness is 2um；Rare-earth permanent magnet blockage after electrophoretic process is put
Enter vacuum infiltration stove and carry out heavy rare earth element infiltration processing, permeate 600 DEG C of temperature, time of penetration 20h；It will be oozed through heavy rare earth element
Treated thoroughly, and rare-earth permanent magnet blockage carries out ageing treatment, 400 DEG C for the treatment of temperature, when soaking time 20 is small；Then by when
Effect treated rare-earth permanent magnet blockage carries out air quenching processing using argon gas.
Embodiment 4
The rare-earth permanent magnet blockage that a specification is 30*20*3 (mm) is taken, which is by the trade mark
The sintered NdFeB blank of N48 is cut.After the surface treatment totally of rare-earth permanent magnet blockage, it is placed in containing holmium fluoride
In penetrant electrophoresis groove liquid, anodic electrophoresis processing is carried out to rare-earth permanent magnet blockage, wherein, the average grain diameter of holmium fluoride is
5um, the mass ratio of penetrant and resinous substrates is 45 mass parts in electrophoresis groove liquid：100 mass parts, the electrophoretic voltage of electrophoretic process
180 volts, electrophoresis time 10 seconds, 20 DEG C of electrophoresis groove liquid temperature, the distance of workpiece and anode be 200cm, using electrophoresis three times, make it
Surface forms the electrophoresis layer that thickness is 30um；Rare-earth permanent magnet blockage after electrophoretic process is put into vacuum infiltration stove to carry out
Heavy rare earth element infiltration is handled, and permeates 800 DEG C of temperature, time of penetration 0.5h；Treated rare earth will be permeated through heavy rare earth element
Permanent magnet blockage carries out ageing treatment, 600 DEG C for the treatment of temperature, when soaking time 2 is small；Then by the rare earth after ageing treatment forever
Magnet blockage carries out air quenching processing using argon gas.
Embodiment 5
The rare-earth permanent magnet blockage that a specification is 30*20*3 (mm) is taken, which is by the trade mark
The sintered NdFeB blank of N48 is cut.After the surface treatment totally of rare-earth permanent magnet blockage, it is placed in and is formed by terbium oxide
Penetrant electrophoresis groove liquid in, to rare-earth permanent magnet blockage carry out ability cathode electrophoresis processing, wherein, the average grain diameter of terbium oxide
For 200um, the mass ratio of penetrant and resinous substrates is 25 mass parts in electrophoresis groove liquid：100 mass parts, the electrophoresis of electrophoretic process
180 volts of voltage, electrophoresis time 20 seconds, 25 DEG C of electrophoresis groove liquid temperature, the distance of workpiece and cathode are 15cm, using an electrophoresis,
Its surface is made to form the electrophoresis layer that thickness is 2um；Rare-earth permanent magnet blockage after electrophoretic process is put into vacuum infiltration stove
Heavy rare earth element infiltration processing is carried out, permeates 600 DEG C of temperature, time of penetration 20h；It will permeate that treated is dilute through heavy rare earth element
Native permanent magnet blockage carries out ageing treatment, 400 DEG C for the treatment of temperature, when soaking time 20 is small；It then will be dilute after ageing treatment
Native permanent magnet blockage carries out air quenching processing using argon gas.
Take the embodiment of the present invention 1 treated that rare-earth permanent magnet blockage carries out properties detection, and will be without infiltration
The rare-earth permanent magnet blockage of processing as a control group, testing result reference table 1.
Table 1 is using terbium oxide infiltration treated rare-earth permanent magnet blockage performance test results
As shown in Table 1, after infiltration processing is carried out to rare-earth permanent magnet blockage, properties are not permeated compared to
For the rare-earth permanent magnet blockage of processing, wherein, intrinsic coercivity is significantly increased.
Take the embodiment of the present invention 2 treated that rare-earth permanent magnet blockage carries out properties detection, and will be without infiltration
The rare-earth permanent magnet blockage of processing as a control group, testing result reference table 2.
Table 2 is using dysprosia infiltration treated rare-earth permanent magnet blockage performance test results
As shown in Table 2, after infiltration processing is carried out to rare-earth permanent magnet blockage, properties are not permeated compared to
For the rare-earth permanent magnet blockage of processing, wherein, intrinsic coercivity is significantly increased.
A kind of method that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method provided by the present invention is carried out above
It is discussed in detail.Specific embodiment used herein is set forth the principle of the present invention and embodiment, implements above
The explanation of example is only intended to help the method and its central idea that understand the present invention.It should be pointed out that the common skill for this field
For art personnel, without departing from the principle of the present invention, can also to the present invention some improvement and modification can also be carried out, these change
Into the protection that the claims in the present invention are also fallen into modification.
It should be noted that herein, term "comprising" or its any other variant are intended to nonexcludability
Comprising so that process, method, article or equipment including a series of elements are not only including those elements, but also wrap
Include other elements that are not explicitly listed or further include for this process, method, article or equipment it is intrinsic will
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that wanted including described
Also there are other identical elements in the process of element, method, article or equipment.
Each embodiment in this specification is described using relevant mode, identical similar portion between each embodiment
Point just to refer each other, and the highlights of each of the examples are difference from other examples.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modifications, equivalent replacements and improvements are made within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
- A kind of 1. method that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that comprise the following steps：Rare-earth permanent magnet workpiece is placed in the electrophoresis groove liquid containing heavy rare earth element, electricity is carried out to the rare-earth permanent magnet workpiece Swimming is handled, and the surface of the rare-earth permanent magnet workpiece is made to form one layer of electrophoresis layer containing heavy rare earth element；Heavy rare earth element infiltration processing is carried out to the rare-earth permanent magnet workpiece after electrophoretic process；Treated rare-earth permanent magnet workpiece will be permeated through heavy rare earth element carry out ageing treatment；Rare-earth permanent magnet workpiece after ageing treatment is subjected to air quenching processing.
- 2. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The electrophoresis groove liquid containing heavy rare earth element, fluoride, oxide comprising heavy rare earth element it is at least one formed Penetrant and resinous substrates.
- 3. the method according to claim 2 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that In the electrophoresis groove liquid, the mass ratio of penetrant and resinous substrates is 25~45 mass parts：100 mass parts.
- 4. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that 50~180 volts of electrophoretic voltage, electrophoresis time 10~1000 seconds, 20~36 DEG C of electrophoresis groove liquid temperature, the workpiece of the electrophoretic process It is 5~200cm with the distance of cathode or anode.
- 5. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The fluoride of the heavy rare earth element, the average grain diameter of oxide are not more than 2mm.
- 6. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The heavy rare earth element is selected from at least one of following element：Dysprosium, terbium and holmium.
- 7. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The thickness of the electrophoresis layer is 2~30um.
- 8. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The infiltration temperature of the infiltration processing is 600~900 DEG C, when time of penetration is 0.5~20 small.
- 9. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, which is characterized in that The holding temperature of the ageing treatment is 400~600 DEG C, when soaking time is 2~20 small.
- 10. the method according to claim 1 that high-performance rare-earth permanent-magnetic body is produced by grain boundary decision method, feature exist In using argon gas or nitrogen to the progress air quenching processing of rare-earth permanent magnet workpiece.
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Cited By (1)
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| CN113394017A (en) * | 2021-06-10 | 2021-09-14 | 北京工业大学 | Method for sintering neodymium iron boron by electroplating electrophoresis in cooperation with deposition diffusion |
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| CN113394017B (en) * | 2021-06-10 | 2023-11-03 | 北京工业大学 | Method for diffusion sintering of neodymium iron boron through electroplating and electrophoresis collaborative deposition |
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