CN106298219A - A kind of method and device preparing R T B rare-earth permanent magnet - Google Patents
A kind of method and device preparing R T B rare-earth permanent magnet Download PDFInfo
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- CN106298219A CN106298219A CN201610676101.XA CN201610676101A CN106298219A CN 106298219 A CN106298219 A CN 106298219A CN 201610676101 A CN201610676101 A CN 201610676101A CN 106298219 A CN106298219 A CN 106298219A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
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Abstract
A kind of method preparing R T B rare-earth permanent magnet, comprises the following steps, and a) preparation is used as the R in diffusion sourceL uRH vFe100‑u‑v‑w‑ zBwMzRare earth alloy, described RLRepresent at least one element in Pr, Nd, RHRepresenting at least one element in Dy, Tb, Ho, M represents at least one element in Co, Nb, Cu, Al, Ga, Zr, Ti, and u, v, w, z meet following relation, 0≤u≤10,35≤v≤70,0.5≤w≤5,0≤z≤5；B) pulverize rare earth alloy, form alloyed powder；C) alloyed powder described in loads Rotational diffusion device together with R T B magnet and carries out thermal diffusion；D) Ageing Treatment is carried out.The method have the advantages that efficient, the low-cost production of the R T B rare earth permanent-magnetic material realizing a kind of high-coercive force, low heavy rare earth content.
Description
Technical field
The invention belongs to rare-earth permanent-magnet material technical field, be specifically related to a kind of method preparing R-T-B rare-earth permanent magnet
And device.
Background technology
R-T-B rare earth permanent-magnetic material has high remanent magnetism, coercivity and big magnetic energy product, in modern industry and electronic technology
In be applied widely, if electronic computer, automation control system, motor and electromotor, nuclear magnetic resonance, NMR are as instrument, sound equipment
The numerous areas such as device, material classification device, communication apparatus.Along with the developing in new opplication field and the harshness of application conditions are many
Becoming, the product demand with high-coercive force gets more and more.Coercivity is one of key property of permanent magnet material, improves coercivity one
It is directly rare earth permanent-magnetic material research and the important topic of theoretical research.
Principal phase Nd2Fe14The saturation induction density of B is the highest, about 1.61T (16.1kGs), theoretical magnetic energy product up to
512KJ/m3, Nd2Fe14B has the highest anisotropy field HA, its coercitive theoretical limit is up to 70kOe.But it is actual
Nd-Fe-B magnet is by principal phase Nd2Fe14B, rich-Nd phase, rich B phase composition, what the coercivity of magnet was only theoretical value 1/10th arrives
1/2nd, and magnet remanent magnetism, magnetic energy product are mainly by magnetic phase Nd2Fe14B determines, coercivity is mainly tied by rich-Nd phase and microcosmic
Structure determines.From the point of view of the magnetic reversal mechanism of sintered neodymium iron boron material, coercivity is mainly the magnetic reversal farmland forming core machine at grain boundaries
System, thus determines magnetic phase boundray structure and magnet coercivity is played an important role by physical characteristic.Improve coercitive side
Method the most all concentrates on raising HAAnd improve border phase structure, one is to add heavy rare earth element in the alloy to improve anisotropy field
HA, another is powder body optimization, uses Two Liquid Phases alloyage process and adds heavy rare earth simple substance or the micron of compound, receives
Rice flour end, it is achieved to microstructure, particularly the effective control to crystal boundary, improves the coercivity of magnet.Also have
A kind of is that the grain boundary decision process that magnet carries out heavy rare earth improves coercivity.
The H of heavy rare earth Dy, TbAHigh 2 times and 3 times than Nd, Dy, Tb add can make magnet coercivity increase considerably.
Tradition high-coercive force R-T-B rare earth permanent-magnetic material mainly adds Dy, Tb heavy rare earth element in alloy melting, although coercivity obtains
To significantly improve, but heavy rare earth enters principal phase, reduces iron atom magnetic moment, thus causes saturation magnetization Bs and remanent magnetism Br
Declining, and Dy, Tb utilization rate in principal phase is low, sufficiently expensive because of Dy, Tb again, product cost significantly rises, and is unfavorable for money
The comprehensive high-efficiency of Dy, Tb heavy rare earth element that source reserves lack utilizes.
Another kind of method is alloy powder optimization allotment, and also referred to as dual alloy method or class dual alloy method, i.e. will be enriched in Dy, Tb
Alloy powder adds in R-T-B alloy powder, then carries out die mould and heat treatment.This method prepare magnet, rich in Dy,
The alloy of Tb is mainly distributed on crystal boundary, and coercivity does not affect intra-die structure while being improved, but rich rare earth β-diketone complex, Tb
The consumption of alloy is the biggest, and Dy, Tb are also to enter principal phase to a certain extent, economically considers to cause production cost still
Higher.
Grain boundary decision method refers to that Dy and Tb that will attach to magnet surface is admitted to sintered body by the crystal boundary of sintered body
Inside, from grain boundary decision to principal phase R2Fe14The inside of each particle of B (R is rare earth element).The method is used to be substantially reduced
The usage amount of heavy rare earth element, significantly improves the magnetic property of magnet.This technique has gained universal acceptance and has implemented in a large number.
Grain boundary decision method has cladding process, the big class of vapour deposition process two at present.Cladding process mainly uses the fluorination of Dy, Tb
Thing, oxide, hydride, it is scattered in solution, then magnet is coated with, diffusion heat treatments.Vapour deposition is will
Metal or alloy Dy, Tb, or the hydride alloy of Dy, Tb is arranged in vacuum equipment, uses assistant depositing means or directly distils
Being evaporated to magnet surface, use assistant depositing means also needs to carry out heat diffusion treatment again.
For from technique, in actual operation, both method of diffusion exist certain not enough.Cladding process needs will be by
The R-T-B magnet processed is well placed and is coated, and this needs more operating personnel to put magnet, production efficiency and cost increasing
Add.Vapour deposition needs to put into R-T-B magnet and has the dysprosium box of support member and be evaporated dysprosium, and magnet can not be with diffusion
The dysprosium in source or disprosium alloy contact, can not have between R-T-B magnet and mutually stop or contact, because pure dysprosium or simple disprosium alloy
(such as dysprosium ferrum, dysprosium aluminium alloy), just occurs to soften or fusing at about 900 DEG C, and this can cause dysprosium infiltration uneven, and product
Inter-adhesive causing product defective, even supporter also can be sticked together with dysprosium or disprosium alloy.As a result, product
Qualification rate is the lowest, on the other hand, after needing more operating personnel to put magnet or process diffusion the dysprosium plate that sticks together with
Support thing, and provide the dysprosium in diffusion source or disprosium alloy and supporter thereof to need to occupy the biggest space, also need between magnet keep
Certain spacing, this will largely effect on batch, and relatively low batch is infeasible by cause economically.
From the point of view of product orientation, for the R-T-B magnet of some relatively small dimensions, such as magnet weight less than 10g, particularly
The magnet weight magnet less than 1g, uses above-mentioned coating and evaporation mode, the production cost caused because of artificial, efficiency, batch
To be higher.
Summary of the invention
A kind of method preparing R-T-B rare-earth permanent magnet, comprises the following steps, and a) preparation is used as diffusion source
RL uRH vFe100-u-v-w-zBwMzRare earth alloy, described RL represents at least one element in Pr, Nd, and RH represents in Dy, Tb, Ho
At least one element, M represents at least one element in Co, Nb, Cu, Al, Ga, Zr, Ti, and this rare earth alloy contains R-Fe-B
The principal phase structure of tetragonal, u, v, w, z are the percetage by weight of each material, and u, v, w, z meet following relation, 0≤u≤10,35
≤ v≤70,0.5≤w≤5,0≤z≤5；B) R is pulverizedL uRH vFe100-u-v-w-zBwMzRare earth alloy, forms alloyed powder；C) described in
Alloyed powder loads Rotational diffusion device together with R-T-B magnet and carries out thermal diffusion, and temperature range is 750-950 DEG C, time interval
For 4-72h；D) Ageing Treatment is carried out.
As preferably, in step a, described RL uRH vFe100-u-v-w-zBwMzRare earth alloy, its melting thickness is ＜ 30mm.
As preferably, in step b, RL uRH vFe100-u-v-w-zBwMzMode pulverized by rare earth alloy is that Mechanical Crushing or hydrogen break
Broken.
As preferably, in step b, described alloyed powder powder granularity ＜ 5mm.
As preferably, in step d, the temperature range of Ageing Treatment is 400-600 DEG C, and time interval is 2-8h.
As preferably, has added in described Rotational diffusion device disperse or cushioning effect accompany material material, this accompanies material thing
Matter is metal iron-based, titanio, or nonmetallic aluminium oxide, zirconic one or more, accompany material agent particle size ＜ 10mm.
As preferably, can also add antiseized powder body in described Rotational diffusion device, antiseized powder body is aluminium oxide, oxidation
Zirconium, dysprosia, terbia. Diterbium trioxide, dysprosium fluoride, fluorination terbium one or more, antiseized powder footpath ＜ 100um.
A kind of device preparing R-T-B rare-earth permanent magnet, the described body of heater that Rotational diffusion device is one end open, described
Body of heater can rotate along axle center.Body of heater rotating speed is 1-10 rev/min.
Compared with prior art: a kind of R with good temperature characteristicsL uRH vFe100-u-v-w-zBwMzAlloyed powder is as diffusion
Source, and by this RL uRH vFe100-u-v-w-zBwMzAlloyed powder and R-T-B magnet be directly loadable into disperser, and in layer places
Diffusion way compares, eliminate and loaded down with trivial details manually put operation, it is to avoid mutual between magnet and magnet, between magnet and supporter
Adhesion, in addition, it is not necessary that the gap reserved between gap between layers, magnet and magnet, drastically increases operation effect
Rate, conforming product rate, batch also obtains the biggest lifting.Rotation mode is compared to static disposing way, the concordance of product
More preferably, reduce the harsh warm area uniformity requirement of equipment, there is the biggest technique, cost advantage simultaneously.
Accompanying drawing is made a summary
Fig. 1 is assembly of the invention schematic diagram.
In accompanying drawing, the content representated by each mark is as follows: 1, body of heater
Zero R-T-B rare-earth permanent magnet；● alloyed powder；
ο accompanies material material；.Antiseized powder body
Detailed description of the invention
Below in conjunction with the accompanying drawings with detailed description of the invention, the present invention is described further.
A kind of method preparing R-T-B rare-earth permanent magnet, it is characterised in that comprise the following steps, a) preparation is used as diffusion
The R in sourceL uRH vFe100-u-v-w-zBwMzRare earth alloy, described RL represents at least one element in Pr, Nd, RH represent Dy, Tb,
At least one element in Ho, M represents at least one element in Co, Nb, Cu, Al, Ga, Zr, Ti, and this rare earth alloy contains R-
The principal phase structure of Fe-B tetragonal, u, v, w, z are the percetage by weight of each material, and u, v, w, z meet following relation, 0≤u≤
10,35≤v≤70,0.5≤w≤5,0≤z≤5；B) R is pulverizedL uRH vFe100-u-v-w-zBwMzRare earth alloy, forms alloyed powder；c)
Described alloyed powder loads Rotational diffusion device together with R-T-B magnet and carries out thermal diffusion, and temperature range is 750-950 DEG C, time
Between interval be 4-72h；D) Ageing Treatment is carried out, in step a, described RL uRH vFe100-u-v-w-zBwMzRare earth alloy, its melting is thick
Degree is ＜ 30mm, in step b, RL uRH vFe100-u-v-w-zBwMzMode pulverized by rare earth alloy is that Mechanical Crushing or hydrogen crush, step b
In, described alloyed powder powder granularity ＜ 5mm, in step d, the temperature range of Ageing Treatment is 400-600 DEG C, and time interval is
2-8h, has added in described Rotational diffusion device disperse or cushioning effect accompany material material, this accompany expect material be metal iron-based,
Titanio, or nonmetallic aluminium oxide, zirconic one or more, accompany material agent particle size ＜ 10mm, described Rotational diffusion dress
Putting and interior can also add antiseized powder body, antiseized powder body is aluminium oxide, zirconium oxide, dysprosia, terbia. Diterbium trioxide, dysprosium fluoride, fluorination terbium
One or more, antiseized powder footpath ＜ 100um, the described body of heater that Rotational diffusion device is one end open 1, described body of heater 1
Can rotate along axle center.
Embodiment 1:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing rapid hardening melting prepared composition is
Pr5Nd5Dy60Tb5Ho5Fe10.5B5Co1Nb1Cu0.5Al0.5Ga0.5Zr0.5Ti0.5Rare earth alloy, alloy sheet thickness is 0.3mm；Should
Hydrogen crushing furnace put into by alloy, and to carry out hydrogen broken, and the broken rear diameter of particle of hydrogen is below 1mm；Subsequently, by the alloyed powder after this pulverizing and R-T-B
Magnet loads the Rotational diffusion device that body of heater rotating speed is 10 revs/min together, carry out temperature be 950 DEG C, time a length of 72h heat expansion
Dissipate.Finally, the Ageing Treatment of 8h then is carried out 600 DEG C of temperature ranges.
Magnetic property before and after the process of R-T-B rare-earth permanent magnet is listed in table 1 and contrasts.
Comparison of magnetic property before and after the process of table 1 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 1, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves 7kOe
Above, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Embodiment 2:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing ingot casting melting prepared composition is
Dy60Fe35B5Rare earth alloy, alloy sheet thickness is 30mm；This alloy being put into disintegrating machine pulverize, after pulverizing, diameter of particle is
Below 5mm；Subsequently, the alloyed powder after this pulverizing is loaded the Rotational diffusion that body of heater rotating speed is 1 rev/min together with R-T-B magnet
Device, the steel ball and the particle diameter that are simultaneously introduced a diameter of 10mm are the zirconia powder of 3um, carry out temperature be 750 DEG C, time a length of 72h
Thermal diffusion.Finally, the Ageing Treatment of 2h then is carried out 450 DEG C of temperature ranges.Magnetic before and after the process of R-T-B rare-earth permanent magnet
Table 2 can be listed in contrast.
Comparison of magnetic property before and after the process of table 2 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 2, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves about
7kOe, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Embodiment 3:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing rapid hardening melting prepared composition is
Nd5Tb50Fe35.5B5Co1Nb1Cu0.5Al0.5Ga0.5Zr0.5Ti0.5Rare earth alloy, alloy sheet thickness is 5mm；This alloy is put into brokenly
Broken machine is pulverized, and after pulverizing, diameter of particle is below 5mm；Subsequently, the alloyed powder after this pulverizing is filled together with R-T-B magnet
Enter the Rotational diffusion device that body of heater rotating speed is 5 revs/min, be simultaneously introduced the dysprosia powder that particle diameter is 3um, carry out temperature be 850 DEG C,
The thermal diffusion of Shi Changwei 24h.Finally, the Ageing Treatment of 6h then is carried out 450 DEG C of temperature ranges.R-T-B rare-earth permanent magnet processes
Magnetic property front and back is listed in table 3 and contrasts.
Comparison of magnetic property before and after the process of table 3 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 3, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves about
7kOe, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Embodiment 4:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing rapid hardening melting prepared composition is
Pr5Dy50Tb5Ho5Fe30B1Co2Nb1Al0.5Zr0.5Rare earth alloy, alloy sheet thickness is 10mm；This alloy is put into disintegrating machine enter
Row is pulverized, and after pulverizing, diameter of particle is below 5mm；Subsequently, the alloyed powder after this pulverizing is loaded body of heater together with R-T-B magnet
Rotating speed is the Rotational diffusion device of 2 revs/min, carry out temperature be 900 DEG C, time a length of 24h thermal diffusion.Finally, then 500 DEG C of temperature
Degree scope carries out the Ageing Treatment of 5h.Magnetic property before and after the process of R-T-B rare-earth permanent magnet is listed in table 4 and contrasts.
Comparison of magnetic property before and after the process of table 4 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 4, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves 7kOe
Above, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Embodiment 5:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing ingot casting melting prepared composition is
Dy30Tb5Fe61B2.5Co1Zr0.5Rare earth alloy, alloy sheet thickness is 15mm；This alloy is put into disintegrating machine pulverize, pulverize
Rear diameter of particle is below 1mm；Subsequently, the alloyed powder after this pulverizing is loaded together with R-T-B magnet body of heater rotating speed be 3 turns/
Point Rotational diffusion device, be simultaneously introduced the alumina powder that particle diameter is 80um, carry out temperature be 800 DEG C, time a length of 12h heat expansion
Dissipate.Finally, the Ageing Treatment of 4h then is carried out 450 DEG C of temperature ranges.Magnetic property before and after R-T-B rare-earth permanent magnet processes is listed in
Table 5 contrasts.
Comparison of magnetic property before and after the process of table 5 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 5, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves about
7kOe, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Embodiment 6:
A kind of method and apparatus preparing R-T-B rare-earth permanent magnet, particularly as follows: employing rapid hardening melting prepared composition is
Pr5Ho40Fe51.5B0.5Nb2Cu0.5Ga0.5Rare earth alloy, alloy sheet thickness is 2mm；This alloy is put into disintegrating machine pulverize,
After pulverizing, diameter of particle is below 3mm；Subsequently, the alloyed powder after this pulverizing being loaded together with R-T-B magnet body of heater rotating speed is 4
Rev/min Rotational diffusion device, be simultaneously introduced dysprosium fluoride that particle diameter is 3um, fluorination terbium powder, carry out temperature be 750 DEG C, time a length of
The thermal diffusion of 24h.Finally, the Ageing Treatment of 5h then is carried out 500 DEG C of temperature ranges.Before and after R-T-B rare-earth permanent magnet processes
Magnetic property is listed in table 6 and contrasts.
Comparison of magnetic property before and after the process of table 6 R-T-B rare-earth permanent magnet
By the comparison of magnetic property of table 6, after illustrating that R-T-B rare-earth permanent magnet is processed by the invention, coercivity improves 7kOe
Above, remanent magnetism Br, magnetic energy product BHmax are declined slightly.
Protection scope of the present invention includes but not limited to embodiment of above, and protection scope of the present invention is with claims
It is as the criterion, replacement that any those skilled in the art making this technology is readily apparent that, deforms, improve and each fall within the present invention's
Protection domain.
Claims (8)
1. the method preparing R-T-B rare-earth permanent magnet, it is characterised in that comprise the following steps, a) preparation is used as diffusion source
RL uRH vFe100-u-v-w-zBwMzRare earth alloy, described RLRepresent at least one element in Pr, Nd, RHRepresent Dy, Tb, Ho
In at least one element, M represents at least one element in Co, Nb, Cu, Al, Ga, Zr, Ti, and this rare earth alloy contains R-
The principal phase structure of Fe-B tetragonal, u, v, w, z are the percetage by weight of each material, and u, v, w, z meet following relation, 0≤u≤
10,35≤v≤70,0.5≤w≤5,0≤z≤5；B) R is pulverizedL uRH vFe100-u-v-w-zBwMzRare earth alloy, forms alloyed powder；C)
Described alloyed powder loads Rotational diffusion device together with R-T-B magnet and carries out thermal diffusion, and temperature range is 750-950 DEG C, time
Between interval be 4-72h；D) Ageing Treatment is carried out.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that in step a, institute
The R statedL uRH vFe100-u-v-w-zBwMzRare earth alloy, its melting thickness is ＜ 30mm.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that in step b,
RL uRH vFe100-u-v-w-zBwMzMode pulverized by rare earth alloy is that Mechanical Crushing or hydrogen crush.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that in step b, institute
The alloyed powder powder granularity ＜ 5mm stated.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that in step d, time
The temperature range that effect processes is 400-600 DEG C, and time interval is 2-8h.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that described rotation
Has added in disperser disperse or cushioning effect accompany material material, this is accompanied and expects that material is metal iron-based, titanio, or nonmetallic
Aluminium oxide, zirconic one or more, accompany material agent particle size ＜ 10mm.
A kind of method preparing R-T-B rare-earth permanent magnet the most according to claim 1, it is characterised in that described rotation
Can also add antiseized powder body in disperser, antiseized powder body is aluminium oxide, zirconium oxide, dysprosia, terbia. Diterbium trioxide, dysprosium fluoride, fluorine
One or more of change terbium, antiseized powder footpath ＜ 100um.
8. according to a kind of device preparing R-T-B rare-earth permanent magnet described in any one of claim 1 to 7, it is characterised in that institute
The body of heater that Rotational diffusion device is one end open stated, described body of heater can rotate along axle center.
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| CN107731437A (en) * | 2017-10-30 | 2018-02-23 | 北京工业大学 | A kind of method for reducing sintered NdFeB thin slice magnet irreversible loss |
| CN108922763A (en) * | 2018-06-08 | 2018-11-30 | 深圳市瑞达美磁业有限公司 | A kind of method improving sintered magnet magnetic property and the magnet being prepared |
| CN108922764A (en) * | 2018-06-08 | 2018-11-30 | 深圳市瑞达美磁业有限公司 | A kind of processing method of radiation orientation sintering magnet ring |
| CN108962524A (en) * | 2018-06-08 | 2018-12-07 | 深圳市瑞达美磁业有限公司 | A kind of sintering orientation magnet infiltration composition for treating, purposes and method |
| CN108962578A (en) * | 2018-06-08 | 2018-12-07 | 深圳市瑞达美磁业有限公司 | A kind of restorative procedure being sintered orientation magnet internal flaw and the magnet after reparation |
| CN113345708A (en) * | 2021-06-18 | 2021-09-03 | 安徽大地熊新材料股份有限公司 | Heat treatment equipment and diffusion method of neodymium iron boron magnet |
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| EP4287227A1 (en) | 2022-05-31 | 2023-12-06 | Yantai Dongxing Magnetic Materials Inc. | Diffusion source material and its use for preparation of ndfeb magnets |
| EP4287220A1 (en) | 2022-05-31 | 2023-12-06 | Yantai Dongxing Magnetic Materials Inc. | Method of preparing a ndfeb magnet and a ndfeb magnet obtained thereby |
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| CN107731437A (en) * | 2017-10-30 | 2018-02-23 | 北京工业大学 | A kind of method for reducing sintered NdFeB thin slice magnet irreversible loss |
| CN108922763A (en) * | 2018-06-08 | 2018-11-30 | 深圳市瑞达美磁业有限公司 | A kind of method improving sintered magnet magnetic property and the magnet being prepared |
| CN108922764A (en) * | 2018-06-08 | 2018-11-30 | 深圳市瑞达美磁业有限公司 | A kind of processing method of radiation orientation sintering magnet ring |
| CN108962524A (en) * | 2018-06-08 | 2018-12-07 | 深圳市瑞达美磁业有限公司 | A kind of sintering orientation magnet infiltration composition for treating, purposes and method |
| CN108962578A (en) * | 2018-06-08 | 2018-12-07 | 深圳市瑞达美磁业有限公司 | A kind of restorative procedure being sintered orientation magnet internal flaw and the magnet after reparation |
| CN108962578B (en) * | 2018-06-08 | 2020-10-09 | 深圳市瑞达美磁业有限公司 | Method for repairing internal defects of sintered oriented magnet and repaired magnet |
| CN108922763B (en) * | 2018-06-08 | 2021-01-05 | 深圳市瑞达美磁业有限公司 | Method for improving magnetic property of sintered magnet and magnet prepared by method |
| CN113345708A (en) * | 2021-06-18 | 2021-09-03 | 安徽大地熊新材料股份有限公司 | Heat treatment equipment and diffusion method of neodymium iron boron magnet |
| WO2023001189A1 (en) | 2021-07-20 | 2023-01-26 | 烟台正海磁性材料股份有限公司 | High-performance sintered neodymium-iron-boron magnet and preparation method therefor |
| EP4287227A1 (en) | 2022-05-31 | 2023-12-06 | Yantai Dongxing Magnetic Materials Inc. | Diffusion source material and its use for preparation of ndfeb magnets |
| EP4287220A1 (en) | 2022-05-31 | 2023-12-06 | Yantai Dongxing Magnetic Materials Inc. | Method of preparing a ndfeb magnet and a ndfeb magnet obtained thereby |
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