CN106783124A - A kind of grain boundary decision Al Cu alloys improve the corrosion proof method of neodymium iron boron magnetic body - Google Patents
A kind of grain boundary decision Al Cu alloys improve the corrosion proof method of neodymium iron boron magnetic body Download PDFInfo
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- CN106783124A CN106783124A CN201611101093.2A CN201611101093A CN106783124A CN 106783124 A CN106783124 A CN 106783124A CN 201611101093 A CN201611101093 A CN 201611101093A CN 106783124 A CN106783124 A CN 106783124A
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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
- H01F41/026—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 protecting methods against environmental influences, e.g. oxygen, by surface treatment
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- 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
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
- C23C10/26—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions more than one element being diffused
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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
Abstract
The corrosion proof method of neodymium iron boron magnetic body is improved the invention discloses a kind of grain boundary decision Al Cu alloys, belongs to rareearth magnetic material field.The method slightly breaks the common ingot casting of low melting point high potential Al Cu alloys, after ball milling directly as the diffusion into the surface source of neodymium iron boron magnetic body, by diffusion heat treatments and annealing heat-treats, one layer of thin layer of richness Al Cu is formed in the crystal boundary of neodymium iron boron magnetic body, so as to obtain highly corrosion resistant neodymium iron boron magnetic body.The present invention can avoid directly adding Al, Cu element in ingot casting using Al Cu alloys as diffusion source, and non magnetic Al, Cu enter principal phase and produce magnetic diluting effect, reduce the remanent magnetism of magnet；The decay resistance and magnetic property of magnet can also be simultaneously improved, because grain boundary decision can improve Grain-Boundary Phase chemical stability, optimizes microstructure, improve the distribution of Grain-Boundary Phase, improve magnet density.
Description
Technical field
The invention belongs to field of rare-earth permanent magnetic, more particularly to a kind of grain boundary decision made of Al-Cu alloy improves neodymium-iron-boron
The corrosion proof method of body.
Technical background
Neodymium iron boron magnetic body is the permanent-magnet material that room temperature comprehensive magnetic can be most strong in the world today, with remanent magnetism high, coercive high
The features such as power and high energy product.Used as rare earth permanent-magnetic material of new generation, neodymium iron boron magnetic body is in computer technology, traffic, space flight army
Work, automatic technology, instrumental technique, microwave communication techniques, medical treatment, field of wind power generation are respectively provided with and are widely applied.Neodymium iron
Boron magnet can be divided into Sintered NdFeB magnet and Agglutinate neodymium-iron-boron magnet, the wherein magnetic property of Sintered NdFeB magnet relatively
It is good, it is most widely used.Low corrosion stability is the shortcoming of neodymium iron boron magnetic body, it has also become restrict one of its wide variety of factor.
The main corrosion reason of neodymium iron boron magnetic body is the difference in Electrode Potential between principal phase and rich neodymium phase, among these the electricity of principal phase
Electrode potential is higher than the electrode potential of rich neodymium phase, rich neodymium is turned into the corruption that anode accelerates rich neodymium phase in " galvanic interaction "
Erosion, constantly corrodes so as to each crystal grain in magnet occur along crystalline substance, and principal phase comes off efflorescence because losing the parcel of Grain-Boundary Phase, and it is right to complete
Macroscopical oxidation of permanent magnet.Therefore diphasic potential subtractive is less to improve magnet corrosion resistant in how causing Sintered NdFeB magnet
The key of erosion ability.
The characteristics of rich-Nd phase crystal boundary is active in sintered NdFeB, electrode potential is low, determines the different intercrystalline corrosion of magnet, therefore
The chemical stability of Grain-Boundary Phase is only improved, improves the distribution of Grain-Boundary Phase, the corrosion stability of magnet could be improved.According to alloy corrosion
Theory, the activity of Grain-Boundary Phase can be reduced to gold element is blended in sintered NdFeB, improve the corrosion potential of rich-Nd phase, reduce crystal boundary
Potential difference mutually and between principal phase, reduces the power of magnet corrosion.
Alloying is to improve the important channel of sintered NdFeB corrosion stability, and people have and add P in neodymium iron boron magnetic body melting,
The elements such as Cr, Ti, Nb improve the chemical stability of Grain-Boundary Phase, improve the decay resistance of magnet.But the method is often
Partial Elements are dissolved in principal phase, damage the magnetic property of magnet.
The content of the invention
In order to overcome the deficiencies in the prior art, neodymium-iron-boron is improved the invention provides a kind of grain boundary decision made of Al-Cu alloy
The corrosion proof method of body.
It is of the invention main relatively low using Al-Cu bianry alloy fusing points, liquid is fused at 600 DEG C or so, carry out crystal boundary expansion
Dissipate.Grain boundary diffusion process made of Al-Cu alloy will not be excessive be dissolved in principal phase and diluted magnetic energy；The expansion of low melting point made of Al-Cu alloy
Dissipate, be conducive to improving wetability of the rich Nd liquid phases along principal phase particle, the microstructure of magnet crystal boundary is improved during tempering, make rich-Nd phase
It is more evenly distributed along crystal boundary, crystal boundary becomes more straight, improves magnet consistency, HCJ, the maximum magnetic flux of magnet can be improved
Energy product and stability；Al, Cu elements diffusion can improve the electrode potential of crystal boundary, so as to improve in the crystal boundary of neodymium iron boron magnetic body
The intrinsic corrosion resistance of Sintered NdFeB magnet.
The present invention is achieved through the following technical solutions.
A kind of grain boundary decision made of Al-Cu alloy improves the corrosion proof method of neodymium iron boron magnetic body, and the method is by low melting point high potential
Made of Al-Cu alloy ingot casting slightly breaks, after ball milling directly as the diffusion into the surface source of neodymium iron boron magnetic body, by diffusion heat treatments, in neodymium iron
The grain boundaries of boron magnet form one layer of richness Al-Cu phase, improve the electrode potential of Grain-Boundary Phase, so as to obtain high corrosion-resistant neodymium iron boron
Magnet.
Preferably, the method is comprised the following steps that：
(1) made of Al-Cu alloy composition is designed as needed, prepares made of Al-Cu alloy；Cu contents are 11-25% atomic percentages, are had
The characteristics of fusing point is relatively low, is conducive to improving wetability of the rich Nd liquid phases along principal phase particle during sintering, and magnet crystal boundary is improved during tempering
Microstructure, rich-Nd phase is more evenly distributed along crystal boundary, crystal boundary becomes more straight, improve magnet densification, magnet can be improved
HCJ, maximum magnetic energy product and stability；
(2) made of Al-Cu alloy in step (1) is smelted into ingot casting, then thick broken, ball milling；
(3) by neodymium iron boron magnetic body submergence after ball milling the made of Al-Cu alloy powder of gained, sealed with tube sealing machine, argon gas protection,
More than the made of Al-Cu alloy its melting point 100-200 DEG C is heated to above, makes made of Al-Cu alloy powder melts for liquid, be attached to
The surface of neodymium iron boron magnetic body, carries out grain boundary decision heat treatment；
(4) sample in step (3) by diffusion heat treatments is carried out into annealing heat-treats, obtains high corrosion-resistant neodymium iron boron magnetic body.
It is further preferred that step（2）The rotating speed of ball mill is 200~400r/min, the time of ball milling during the ball milling
It is 5-15h.
It is further preferred that step（3）The neodymium iron boron magnetic body be sintered state or sintering after and by temper mistake.
It is further preferred that step（3）The temperature of the diffusion heat treatments is 650-750 DEG C, and the time is 1-5h.
It is further preferred that step（4）The temperature of the annealing heat-treats is 500-550 DEG C, and the time is 1-5h.
Diffusion source of the present invention made of Al-Cu alloy can be molten into liquid and be coated on neodymium iron boron surface, can accelerate Al, Cu element in crystalline substance
The diffusion on boundary, improves the grain boundary potentials of Sintered NdFeB magnet, so as to improve the intrinsic corrosion resistance of Sintered NdFeB magnet.
Compared with prior art, advantages of the present invention is as follows：
1. diffusion source made of Al-Cu alloy is coated in neodymium iron boron magnetic body surface, using grain boundary diffusion process, can avoid Al, Cu element
Dispensing link before smelting neodymium-iron-boron, the excessive principal phase that enters produces magnetic diluting effect, reduces the magnetic property of magnet.
2. Al, Cu element electrode potential are higher in diffusion source made of Al-Cu alloy, Al, Cu elements diffusion to neodymium-iron-boron
In the crystal boundary of body, the grain boundary potentials of Sintered NdFeB magnet are improved, the potential difference of principal phase and Grain-Boundary Phase is reduced, so as to reduce magnet
The driving force of corrosion, improves the intrinsic corrosion resistance of Sintered NdFeB magnet.
3. low diffusion alloy fusing point means that under identical diffusion temperature diffusion alloy liquid has the degree of superheat higher,
Bigger diffusion potential energy, so as to reach bigger diffusion depth in diffusion process.Low melting point made of Al-Cu alloy grain boundary decision is favourable
In wetability of the richness Nd liquid phases along principal phase particle is improved, the microstructure of magnet crystal boundary is improved during tempering, make rich-Nd phase along crystal boundary
It is more evenly distributed, crystal boundary becomes more straight, improves magnet consistency, improves the HCJ of magnet, maximum magnetic energy product and steady
It is qualitative.By contrast, the diffusion technique applicability is wider, and energy consumption is lower.
Brief description of the drawings
Fig. 1 is the corrosion potential figure of comparative sample before and after grain boundary decision in embodiment.
Fig. 2 is the electrochemical alternate impedance spectrum figure of comparative sample before and after grain boundary decision in embodiment.
Specific embodiment
The present invention is described in further detail with accompanying drawing below in conjunction with example, but embodiments of the present invention are not limited to
This.
Embodiment 1：48SH magnet surfaces coat Al82.9Cu17.1(atomic percentage) powder grain boundary decision is heat-treated
From 48SH commercialization Sintered NdFeB magnets, the square sample that size is 4 × 4 × 4mm is processed into, is designated as No. 1 sample.
Al is matched according to alloying component82.9Cu17.1(atomic percentage) weighs Al and Cu of the purity more than 99.99%, by Al
It is put into electric arc furnaces with Cu, is evacuated to 5 × 10-3Pa, oxygen uptake Ti blocks is first melted the oxygen exhausted in lumen,residual, then repeatedly
By each sample melting 4 times, it is ensured that uniform component distribution.
By melted button shape ingot casting grinder buffing, then remove superficial oxidation skin with fine sandpaper polishing, be placed on alcohol
It is middle to be cleaned by ultrasonic totally.Using pliers coarse crushing into fritter, by ratio of grinding media to material 10:1, rotating speed 300r/min, and argon filling in ball grinder
Gas shielded carries out ball milling 10 hours, by 120 mesh sieve, obtains made of Al-Cu alloy powder.
By in the submergence of 48SH commercialization Sintered NdFeB magnets after ball milling the made of Al-Cu alloy powder of gained, sample is sealed
Pipe secret envelope, argon gas protection is placed in heat-treatment furnace, and Technology for Heating Processing is 700 DEG C, is incubated 3h, then again in 520 DEG C of insulations
2h, this grain boundary decision sample is designated as No. 2 samples.
Embodiment 2：48SH magnet surfaces coat Al89Cu11(atomic percentage) powder grain boundary decision is heat-treated
From 48SH commercialization Sintered NdFeB magnets, the square sample that size is 4 × 4 × 4mm is processed into, is designated as No. 1 sample.
Al is matched according to alloying component89Cu11(atomic percentage) weighs Al and Cu of the purity more than 99.99%, by Al and
Cu is put into electric arc furnaces, is evacuated to 5 × 10-3Pa, oxygen uptake Ti blocks are first melted the oxygen exhausted in lumen,residual, then repeatedly will
Each sample melting 5 times, it is ensured that uniform component distribution.
By melted button shape ingot casting grinder buffing, then remove superficial oxidation skin with fine sandpaper polishing, be placed on alcohol
It is middle to be cleaned by ultrasonic totally.Using pliers coarse crushing into fritter, by ratio of grinding media to material 10:1, rotating speed 200r/min, and argon filling in ball grinder
Gas shielded carries out ball milling 15 hours, by 120 mesh sieve, obtains made of Al-Cu alloy powder.
By in the submergence of 48SH commercialization Sintered NdFeB magnets after ball milling the made of Al-Cu alloy powder of gained, sample is sealed
Pipe secret envelope, argon gas protection is placed in heat-treatment furnace, and Technology for Heating Processing is 650 DEG C, is incubated 5h, then again in 500 DEG C of insulations
5h, this grain boundary decision sample is designated as No. 3 samples.
Embodiment 3：48SH magnet surfaces coat Al75Cu25(atomic percentage) powder grain boundary decision is heat-treated
From 48SH commercialization Sintered NdFeB magnets, the square sample that size is 4 × 4 × 4mm is processed into, is designated as No. 1 sample.
Al is matched according to alloying component75Cu25(atomic percentage) weighs Al and Cu of the purity more than 99.99%, by Al and
Cu is put into electric arc furnaces, is evacuated to 5 × 10-3Pa, oxygen uptake Ti blocks are first melted the oxygen exhausted in lumen,residual, then repeatedly will
Each sample melting 4 times, it is ensured that uniform component distribution.
By melted button shape ingot casting grinder buffing, then remove superficial oxidation skin with fine sandpaper polishing, be placed on alcohol
It is middle to be cleaned by ultrasonic totally.Using pliers coarse crushing into fritter, by ratio of grinding media to material 10:1, rotating speed 400r/min, and argon filling in ball grinder
Gas shielded carries out ball milling 5 hours, by 120 mesh sieve, obtains made of Al-Cu alloy powder.
By in the submergence of 48SH commercialization Sintered NdFeB magnets after ball milling the made of Al-Cu alloy powder of gained, sample is sealed
Pipe secret envelope, argon gas protection is placed in heat-treatment furnace, and Technology for Heating Processing is 750 DEG C, is incubated 1h, then again in 550 DEG C of insulations
1h, this grain boundary decision sample is designated as No. 4 samples.
Embodiment 4
Corrosion-resistant experiment is carried out to the 1-4 samples in embodiment 1-3, the method for corrosion is characterized for electrochemical workstation is tested, electricity
When test chemical device is connected with sample section, using traditional three-electrode system, working electrode is neodymium iron boron magnetic body, exposure
Product is 4 × 4mm2It is square, and wire draw.Auxiliary electrode is platinum electrode, and reference electrode is saturated calomel electrode；Electrolyte is
3.5wt% NaCl solutions, connect Shanghai Chen Hua CHI660D work stations, you can determine the chemical property under different operating modes.
After Fig. 1 soaks 10 minutes in the electrolytic solution for 1-4 samples, the corrosion potential figure of electrochemical system steady testing.
As can be seen from Figure, the electrode potential of 2-4 samples magnet is significantly improved relative to No. 1 sample, from the thermodynamics of material
Angle sees that electrode potential is higher, more tends towards stability, and chemical stability is better, i.e., sample is more corrosion-resistant.Illustrate that made of Al-Cu alloy is brilliant
After boundary's diffusion, the corrosion potential of neodymium iron boron magnetic body is significantly improved, that is, improve the decay resistance of neodymium iron boron magnetic body.
Fig. 2 is the electrochemical alternate impedance spectrum figure of 1-4 samples, and Impedance measurement spectral frequency scope is 10-2~105Hz, amplitude
It is 10 mv.By be can be seen that in figure, neodymium iron boron magnetic body shows as single capacitive reactance arc, curve incipient stage in neutral NaCl watery solution
There is an intersection point with transverse axis, this is working electrode and to the solution resistance Rs between electrode；The capacitive reactance arc for being formed afterwards correspond to
The double electrical layerses that electrode surface is formed with solution, curve finally forms an intersection point with transverse axis（Rs+Rp）, wherein Rp is pole
Change resistance.Capacitive reactance arc radius are bigger, and magnet is more corrosion-resistant.It can be seen that the capacitive reactance arc radius of 2-4 samples are significantly greater than No. 1 in figure
The capacitive reactance arc radius of sample, illustrate that 2-4 samples show more preferable chemical stability, more excellent decay resistance.
Claims (6)
1. a kind of grain boundary decision made of Al-Cu alloy improves the corrosion proof method of neodymium iron boron magnetic body, it is characterised in that the method is by eutectic
Point high potential made of Al-Cu alloy ingot casting slightly breaks, after ball milling directly as the diffusion into the surface source of neodymium iron boron magnetic body, at diffusion heat
Reason, one layer of richness Al-Cu phase is formed in the grain boundaries of neodymium iron boron magnetic body, improves the electrode potential of Grain-Boundary Phase, so as to obtain high resistance to
Corrosion neodymium iron boron magnetic body.
2. a kind of grain boundary decision made of Al-Cu alloy according to claim 1 improves the corrosion proof method of neodymium iron boron magnetic body, and it is special
Levy and be, the method is comprised the following steps that：
(1) made of Al-Cu alloy that Cu contents are 11-25% atomic percentages is prepared；
(2) made of Al-Cu alloy in step (1) is smelted into ingot casting, then thick broken, ball milling；
(3) by neodymium iron boron magnetic body submergence after ball milling the made of Al-Cu alloy powder of gained, sealed with tube sealing machine, argon gas protection, plus
Heat is attached to neodymium to higher than more than the made of Al-Cu alloy its melting point 100-200 DEG C, making made of Al-Cu alloy powder melts for liquid
The surface of iron boron magnet, carries out grain boundary decision heat treatment；
(4) sample in step (3) by diffusion heat treatments is carried out into annealing heat-treats, obtains high corrosion-resistant neodymium iron boron magnetic body.
3. a kind of grain boundary decision made of Al-Cu alloy according to claim 1 improves the corrosion proof method of neodymium iron boron magnetic body, and it is special
Levy and be, step（2）The rotating speed of ball mill is 200~400r/min during the ball milling, and the time of ball milling is 5-15h.
4. a kind of grain boundary decision made of Al-Cu alloy according to claim 1 improves the corrosion proof method of neodymium iron boron magnetic body, and it is special
Levy and be, step（3）The neodymium iron boron magnetic body be sintered state or sintering after and by temper mistake.
5. a kind of grain boundary decision made of Al-Cu alloy according to claim 1 improves the corrosion proof method of neodymium iron boron magnetic body, and it is special
Levy and be, step（3）The temperature of the diffusion heat treatments is 650-750 DEG C, and the time is 1-5h.
6. a kind of grain boundary decision made of Al-Cu alloy according to claim 1 improves the corrosion proof method of neodymium iron boron magnetic body, and it is special
Levy and be, step（4）The temperature of the annealing heat-treats is 500-550 DEG C, and the time is 1-5h.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108305773A (en) * | 2017-12-25 | 2018-07-20 | 宁波韵升股份有限公司 | A method of preparing performance Nd Fe B sintered magnet |
| CN108565105A (en) * | 2018-03-05 | 2018-09-21 | 华南理工大学 | A kind of high-coercive force neodymium iron boron magnetic body and preparation method thereof |
| CN108682550A (en) * | 2018-05-08 | 2018-10-19 | 北京工业大学 | A kind of raising Sintered NdFeB magnet corrosion resistance and coercitive method |
| CN109192489A (en) * | 2018-09-03 | 2019-01-11 | 浙江东阳东磁稀土有限公司 | A kind of preparation method of high-performance heavy rare earth neodymium iron boron magnetic body |
| CN111052276A (en) * | 2017-09-26 | 2020-04-21 | 日立金属株式会社 | Method for producing R-T-B sintered magnet |
| CN111599561A (en) * | 2019-02-21 | 2020-08-28 | 有研稀土新材料股份有限公司 | Neodymium-iron-boron magnet and preparation method thereof |
| CN112652480A (en) * | 2019-10-12 | 2021-04-13 | 杭州永磁集团有限公司 | Neodymium iron boron grain boundary diffusion heat treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6110034B2 (en) * | 1979-10-05 | 1986-03-27 | Mitsubishi Heavy Ind Ltd | |
| CN103668178A (en) * | 2013-12-03 | 2014-03-26 | 江苏大学 | Method for improving corrosion resistance of sintered neodymium iron boron magnet |
| CN105170976A (en) * | 2015-10-23 | 2015-12-23 | 北京科技大学 | Method for preparing high-coercivity neodymium iron boron by means of low-temperature sintering after blank compacting permeation |
-
2016
- 2016-12-05 CN CN201611101093.2A patent/CN106783124A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6110034B2 (en) * | 1979-10-05 | 1986-03-27 | Mitsubishi Heavy Ind Ltd | |
| CN103668178A (en) * | 2013-12-03 | 2014-03-26 | 江苏大学 | Method for improving corrosion resistance of sintered neodymium iron boron magnet |
| CN105170976A (en) * | 2015-10-23 | 2015-12-23 | 北京科技大学 | Method for preparing high-coercivity neodymium iron boron by means of low-temperature sintering after blank compacting permeation |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111052276A (en) * | 2017-09-26 | 2020-04-21 | 日立金属株式会社 | Method for producing R-T-B sintered magnet |
| CN111052276B (en) * | 2017-09-26 | 2021-08-27 | 日立金属株式会社 | Method for producing R-T-B sintered magnet |
| CN108305773A (en) * | 2017-12-25 | 2018-07-20 | 宁波韵升股份有限公司 | A method of preparing performance Nd Fe B sintered magnet |
| CN108565105A (en) * | 2018-03-05 | 2018-09-21 | 华南理工大学 | A kind of high-coercive force neodymium iron boron magnetic body and preparation method thereof |
| WO2019169875A1 (en) * | 2018-03-05 | 2019-09-12 | 华南理工大学 | High-coercivity neodymium iron boron magnet and preparation method therefor |
| CN108682550A (en) * | 2018-05-08 | 2018-10-19 | 北京工业大学 | A kind of raising Sintered NdFeB magnet corrosion resistance and coercitive method |
| CN109192489A (en) * | 2018-09-03 | 2019-01-11 | 浙江东阳东磁稀土有限公司 | A kind of preparation method of high-performance heavy rare earth neodymium iron boron magnetic body |
| CN111599561A (en) * | 2019-02-21 | 2020-08-28 | 有研稀土新材料股份有限公司 | Neodymium-iron-boron magnet and preparation method thereof |
| CN111599561B (en) * | 2019-02-21 | 2021-12-14 | 有研稀土新材料股份有限公司 | Neodymium-iron-boron magnet and preparation method thereof |
| CN112652480A (en) * | 2019-10-12 | 2021-04-13 | 杭州永磁集团有限公司 | Neodymium iron boron grain boundary diffusion heat treatment method |
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