CN108922714A - A kind of preparation method of high-coercive force neodymium ferrocerium boron sintered magnet - Google Patents
A kind of preparation method of high-coercive force neodymium ferrocerium boron sintered magnet Download PDFInfo
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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
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- 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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- 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
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- 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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- 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
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- 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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Abstract
The invention belongs to permanent-magnet material technical fields, specifically disclose a kind of preparation method of high-coercive force neodymium ferrocerium boron sintered magnet, this method carries out moistened surface cladding to magnetic powder in mixing by using rare earth compounding organic solvent, effectively controls the oxidation of richness Ce magnetic powder；The rare earth compounding on magnetic powder surface is decomposed in high-temperature sintering process simultaneously, C and H element become gas evolution, the heavy rare earth element Pr/Nd/Tb/Dy/Ho etc. for remaining in alloy powder particle surface serves as diffusion source, it is spread to grain surface, realize the magnetic hardening on main phase grain surface, local magnetocrystalline anisotropy field is improved, neodymium cerium iron boron magnet coercivity is improved.The neodymium ferrocerium boron sintered magnet coercivity of this method preparation is higher, and to conventional sintering, magnet preparation process is improved, simple, at low cost, the suitable large-scale production of technical process.
Description
Technical field
The invention belongs to permanent-magnet material technical fields, and in particular to a kind of preparation of high-coercive force neodymium ferrocerium boron sintered magnet
Method.
Background technique
Neodymium iron boron (Nd-Fe-B) permanent-magnet material is current magnetic most strong and most widely used magnetic functional material.From 1984
Development in more than 30 years is passed through in year discovery so far, and Nd-Fe-B permanent magnetism relies on its excellent hard magnetic property, is widely used in disk and deposits
Storage, electroacoustic equipment, medical instrument, the hybrid vehicle in aerospace and clean energy resource field and wind-driven generator etc.,
As the indispensable critical function material of new high-tech industry.Meanwhile Nd-Fe-B permanent magnetism is also to consume the most material of rare earth
Material consumes rare earth content year close to the half of the total dosage of China's rare earth.In recent years, demand of the downstream industry to Nd-Fe-B permanent magnetism is in
Leaping growth, Nd-Fe-B magnet height rely on that the reserves such as Nd, Pr, Dy, Tb are few, expensive middle heavy rare earth, and consumption is tight
Weight.And abundance is high in the natures such as Ce, rare earth element of price low (price of Ce is only 1/10 of Pr, Nd or so at present) is forever
Few in the preparation of magnetic material to use, appearance is a large amount of to overstock, and causes rare earth resources using serious imbalance.Therefore, optimize resource
Configuration, it is extremely urgent.Largely substituting Pr/Nd with the Ce of high abundance in permanent-magnet material is one of expected effective ways.
RE2Fe14The ferromagnetism of Type B (RE, Rare earth) permanent-magnet material derives from 2：14：1 tetragonal phase.And Ce2Fe14B
(Js=11.7kG, HA=26kOe, Tc=424K) intrinsic magnetic properties can be far below Nd2Fe14B (Js=16.0kG, HA=73kOe,
Tc=585K), particular reference " R2Fe14B material：Intrinsic properties and technology ", modern physics comment, volume 63, the 4th phase,
Page 819~828, in October, 1991.A large amount of Ce replace Nd, magnet comprehensive magnetic energy rapid decrease, magnetic dilution in Nd-Fe-B
Effect is obvious, this is also preparation high-performance, richness Ce one most important difficult point of magnet.Wish that Rare-Earth Ce is produced in neodymium iron boron magnetic body
Middle realization is widely applied, especially the N35 board required by the numerous areas such as electroacoustic equipment, disk memory and magnetic plant
In number magnet.The high Ce content magnet (i.e. Ce substitution amount >=40wt.%) reported at present although magnetic energy product can reach 35MGOe,
But magnet coercivity H j is universal lower, is not able to satisfy practical service demand.
In order to improve the coercivity of rich Ce magnet, such as：In the patent document of Publication No. CN102800454A, Li Wei etc.
Replace one of Nd, Pr, Dy, Tb, Ho element of part with Ce or several is prepared for double-main phase Ce permanent-magnet alloy.Alloy is molten
When refining, element T b, Dy, Ho of heavy rare earth etc. are added, although directly alloy addition heavy rare earth element can effectively improve magnetic
Body coercivity, but its heavy rare earth element utilization efficiency will be far below the method for crystal boundary addition diffusion, magnet preparation cost is higher.
And magnet coercivity is improved for grain boundary decision, the patent document of Publication No. CN106710768A discloses a kind of addition hydrogenation
Neodymium improves the coercitive method of neodymium ferrocerium boron sintered magnet, it is characterised in that crystal boundary adds the neodymium hydride having a size of 0.1~3.0 μm
Alloy powder, by the way that in high-temperature sintering process, the dehydrogenation of crystal boundary neodymium hydride, neodymium element form magnetic to main phase crystal boundary boundary diffusion
The higher Hard Magnetic shell of anisotropic crystalline improves magnet coercivity.But this method not can be effectively controlled rich Ce main-phase alloy powder
End and rare earth hydride powder oxidation, and cannot be guaranteed grain boundary alloys powder energy even dispersion main-phase alloy powder particle it
Between, if two powder particle sizes are close, rare earth hydride powder be cannot achieve along boundary package main-phase alloy powder particle
Effect；If crystal boundary rare earth hydride powder is too thin, since small-size effect is easily reunited and aoxidized, equally it is unfavorable for dispersing,
Though therefore the process can improve richness Ce magnet coercivity, control oxygen is required strictly, and process is relatively complicated.
Therefore, the present invention proposes a kind of preparation method of high-coercive force richness Ce magnet on the basis of traditional handicraft.Pass through
Moistened surface cladding is carried out to Nd-Ce-Fe-B main-phase alloy magnetic powder using rare earth compounding organic solution, it is anti-oxidant to reach magnetic powder
Purpose；The rare earth compounding on magnetic powder surface is decomposed in high-temperature sintering process simultaneously, and remaining middle heavy rare earth element serves as diffusion
The magnetic hardening on main phase grain surface is realized to main phase grain diffusion into the surface in source, improves local magnetocrystalline anisotropy field, improves neodymium
Cerium iron boron magnet coercivity, middle heavy rare earth utilization efficiency are higher.Success by the coercivity of high Ce content magnet promoted to 12kOe with
On, preparation process is simple, and cost is relatively low and is suitble to large-scale production.
Summary of the invention
It is an object of the invention to overcome prior art richness Ce rare earth permanent-magnetic material coercivity low, magnetic powder is oxidizable to be asked
Topic, to provide, a kind of technical process is simple, and coercivity promotes the preparation method of apparent neodymium cerium iron boron magnet.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme：
A kind of preparation method of high-coercive force neodymium ferrocerium boron sintered magnet, which is characterized in that added in master alloying powder
Organic solution containing rare earth compounding carries out mechanical mixing, realizes powder particle surface wetting cladding；By the powder particle after cladding
Neodymium ferrocerium boron sintered magnet, the main conjunction are obtained after orientation die mould, cold isostatic compaction, vacuum-sintering, heat treatment
Bronze end is the rare-earth-iron-boron magnetic alloy powder particle containing Rare-Earth Ce element.
The master alloying powder is made with the following method：
Blending process：Weigh raw material；
Above-mentioned raw materials are prepared into alloy sheet using induction melting and rapid hardening belt-rejecting technology；
By the alloy sheet by hydrogen is quick-fried and jet milling process, master alloying powder is made.
The solute of the organic solution mainly with one of Pr, Nd, Tb, Dy, Ho or several rare earth elements be with
The organic coordination compound of body, strong oxidizing property group is free of in the solvent of the organic solution, and predominantly 95# aviation gasoline or alcohol is molten
Liquid.
The ingredient of the raw material is (NdaPrbCe1-a-b)cFe100-c-d-eBdMe, wherein：M be Co, Ni, Mo, Ga, Al, Cu,
One or more of Zr, Nb element, a, b, c, d meet following relationship：0≤a < 1,0≤b < 1, a+b < 1,27≤c≤34,
0.8≤d≤1.3,0≤e≤3.
The raw material is using richness Ce pivot alloy and without Ce pivot alloy, by rich Ce pivot alloy and without Ce pivot alloy point
Not Cai Yong induction melting, rapid hardening get rid of that band, hydrogen is quick-fried and the technique of airflow milling is prepared into pivot alloy powder, by rich Ce pivot alloyed powder
It end and is mixed according to a certain percentage without Ce pivot alloy powder, it is mixed to obtain the rare-earth-iron-boron containing Rare-Earth Ce element
Close master alloying powder.
Rich Ce pivot alloying component is denoted as (Nd with mass percentaPrbCe1-a-b)cFe100-c-d-eBdMe, wherein：M be Co,
One or more of Ni, Mo, Ga, Al, Cu, Zr, Nb element, a, b, c, d meet following relationship：0≤a < 1,0≤b < 1, a+
B < 1,27≤c≤34,0.8≤d≤1.3,0≤e≤3；The no Ce pivot alloying component is (Nd by percentage to the qualitya’
Pr1-a’)b’Fe100-b’-c’-d’Bc’Md’；Wherein a ', b ', c ', d ' meet following relationship：0≤a '≤1,27≤b '≤34,0.8≤
C '≤1.3,0≤d '≤3.
The mechanical mixing be specially uniformly mix 0.5 in mixing equipment under nitrogen or argon atmosphere~
1.0h, the mixing equipment use three-dimensional motion mixer.
The rare earth compounding organic solution of 1mL~100mL is added in described machinery every kilogram of alloy powder of mixing.
The orientation die mould carries out under the magnetic field of 1.5~2.0T, about 5.5Mpa vertical magnetic field pressure；It is described cold etc.
Hydrostatic profile is carried out in 150~220MPa.
The temperature of the vacuum-sintering is 1000~1100 DEG C, and sintering time is 2~3h, is heat-treated as 550~950
DEG C tempering 3~5h.
The beneficial effects of the invention are as follows：(1) present invention during mixed powder, match by rare earth of the addition containing middle heavy rare earth element
Object organic solvent is closed, fine powder surface oxidation-resistant cladding is realized, inhibits the high oxidation reactivity of richness Ce magnetic powder particle, prevent powder
Oxidation guarantees magnet performance.
(2) present invention is improved and is solved in such a way that liquid solution crystal boundary adds in conventional pairing gold process, brilliant
Boundary adds the non-uniform problem of Dispersed precipitate present in alloy powder containing heavy rare earth element or other compound powders, so that in
Heavy rare earth spreads the surface for being distributed in powder particle that source can be more uniform.
(3) present invention selects organic solvent for 95# aviation gasoline or alcoholic solution, both has very strong volatility,
It under high vacuum and hot conditions, will not remain in magnet, be conducive to rare earth organic complex after evolution in powder particle table
Face is precipitated.
(4) rare earth organic complex provided by the invention mainly contains C, the elements such as H, after pyrolytic, the elements such as C and H
It can be discharged in the form of gas, not introduce other impurities.And the remaining middle heavy rare earth element of institute is then to main phase grain diffusion into the surface,
The significantly promotion for realizing main phase grain surface magnetocrystalline anisotropy field, to increase substantially the coercivity of magnet.
(5) rare earth element diffusion process provided by the invention is the process progress in magnet sintering densification, compared to existing
Have a technology further high-temperature heat treatment diffusion heavy rare earth element on closely knit magnet after sintering, more energy saving, process and when
Between cost.
(6) sintering temperature is selected as 1000~1100 DEG C of sintering times and is set as 2~3h by the present invention, is to obtain crystal grain ruler
Very little uniform and fine and close magnet.It is sintered lower than 1000 DEG C, although magnet crystal grain will not grow up, is difficult to obtain higher close
Degree, liquid sintering process is incomplete, and magnet internal void is more, and magnet performance is poor；The high-temperature stable of rich Ce alloy is relatively
Difference is sintered the abnormal growth that can not only cause crystal grain higher than 1100 DEG C, and will lead to the decomposition of the phase of magnetic alloy containing Ce, causes
Magnet performance deteriorates.Therefore, for rich Ce alloy, in order to obtain higher performance, 1000~1100 DEG C of sintering are selected very
It is crucial.
Detailed description of the invention
The process flow chart of Fig. 1 the application.
Fig. 2 is the demagnetizing curve of the sintered magnet obtained in embodiment 1.
Fig. 3 is the demagnetizing curve of the sintered magnet obtained in embodiment 2.
Specific embodiment
It is below with reference to the accompanying drawings and in conjunction with the embodiments, next that the present invention will be described in detail.
(1) it is (Nd that raw material, which selects the average nominal ingredient of alloy,aPrbCe1-a-b)cFe100-c-d-eBdMe, wherein：M be Co, Ni,
One or more of Mo, Ga, Al, Cu, Zr, Nb element, a, b, c, d meet following relationship：0≤a < 1,0≤b < 1, a+b <
1,27≤c≤34,0.8≤d≤1.3,0≤e≤3；
(2) alloy is by induction melting, and band is got rid of in rapid hardening, and hydrogen is quick-fried and jet milling process, and it is 1~5 μ that average grain diameter, which is made,
The powder particle of m.
(3) organic solvent containing rare earth compounding is added in alloy powder, under protective atmosphere (nitrogen or argon gas)
0.5~1.0h is uniformly mixed in mixing equipment, wherein the volume of rare earth compounding organic solvent is compared to hybrid alloys powder
Quality is one of every kilogram of 1~100mL, rare earth element contained by solvent predominantly middle heavy rare earth element Pr, Nd, Tb, Dy, Ho
Perhaps the solvent of several combinations organic solution is mainly 95# aviation gasoline or alcoholic solution.
(4) alloy powder that mixing is completed is taken under the magnetic field of 1.5~2.0T, the vertical magnetic field pressure of 5.5Mpa
To die mould；The magnetic patch that die mould is completed carries out the isostatic cool pressing of 150~220MPa, its die mould is made to become green compact.
(5) in vacuum sintering furnace, the magnetic patch that die mould is completed is carried out 1000 in vacuum-sintering and heat-treatment furnace~
High-coercive force neodymium ferrocerium boron sintered magnet is finally made in 1100 DEG C of 2~3h of sintering, then 550~950 DEG C of 3~5h of tempering.
Embodiment 1：
(1) Ce pivot alloy is prepared into alloy sheet using induction melting, rapid hardening belt-rejecting technology, wherein the alloy is with matter
Percentage meter is measured, ingredient is (Pr0.12Nd0.48Ce0.4)33Fe65M1.0B1.0, wherein M is Co=0.5, Cu=0.35, Zr=
0.05, Ga=0.1.
(2) alloy sheet carries out to hydrogen is quick-fried and airflow milling powder, average particle size particle size is at 3.5 μm or so.
(3) Dy organic coordination compound solution is added in hybrid alloys powder, in nitrogen (N2) under protective atmosphere in three-dimensional
0.5h is uniformly mixed in drum mixer, wherein three cyclopentadiene dysprosium Dy (C5H5)395# aviation gasoline solution volume phase
Than being to add 5mL in every kilogram of alloy powder in hybrid alloys powder quality ratio；The Dy organic coordination compound solution is preferably
Three cyclopentadiene dysprosium Dy (C5H5)395# aviation gasoline solution.The three-dimensional drum mixer is preferably three-dimensional motion mixing
Machine.
(4) alloy powder that mixing is completed is subjected to orientation die mould under the magnetic field of~1.8T, the magnetic patch that die mould is completed
Progress~200MPa isostatic cool pressing makes its die mould become green compact.
(5) in vacuum sintering furnace, the magnetic patch that die mould is completed is subjected to 1030 DEG C of burnings in vacuum-sintering and heat-treatment furnace
2.5h is tied, then the neodymium ferrocerium boron sintered magnet that Ce substitution amount is 40% is finally made in 920 DEG C of tempering 4.5h.
The Sintered NdFeB magnet prepared is put into BH loop tester, measures its every magnetic along differently- oriented directivity
Performance indicator, demagnetizing curve such as Fig. 2, design parameter result are as follows：
Remanent magnetism Br=11.5kG, coercivity Hcj=14.6kOe, maximum magnetic energy product (BH)max=33.1MGOe.
Embodiment 2：
(1) it is respectively adopted that induction melting, rapid hardening slab, hydrogen is quick-fried and airflow milling by rich Ce pivot alloy and without Ce pivot alloy
Technique prepare alloy powder, powder average grain is substantially at 3.5 μm or so, and the richness Ce pivot alloy is with mass percent
Meter, ingredient are (Pr0.1Nd0.4Ce0.5)30.5Fe67M1.5B1.0, wherein M is Al=0.5, Co=0.5, Cu=0.35, Zr=
0.05, Ga=0.1；The no Ce pivot alloy is calculated in mass percent, and ingredient is (Pr0.2Nd0.8)30.5Fe67M1.5B1.0,
Middle M is Al=0.5, Co=0.5, Cu=0.35, Zr=0.05, Ga=0.1.
(2) by rich Ce pivot alloy powder and without Ce pivot alloy powder according to mass fraction be 6：4 ratio taken amount, so
Pr complex organic solution is added in mixed alloy powder afterwards, in three-dimensional drum-type mixing under nitrogen protection atmosphere
0.5h is uniformly mixed in machine, wherein three cyclopentadiene praseodymium Pr (C5H5)395# aviation gasoline solution volume compared to mixing close
Bronze end mass ratio is that every kilogram of alloy powder adds 5mL；The Pr complex organic solution is preferably three cyclopentadiene praseodymiums
Pr(C5H5)395# aviation gasoline solution.The three-dimensional drum mixer is preferably three-dimensional motion mixer.
(3) alloy powder that mixing is completed is subjected to orientation die mould under the magnetic field of~1.8T；The magnetic patch that die mould is completed
Progress~200MPa isostatic cool pressing makes its die mould become green compact.
(4) in vacuum sintering furnace, the magnetic patch that die mould is completed is subjected to 1020 DEG C of burnings in vacuum-sintering and heat-treatment furnace
2h is tied, then the neodymium ferrocerium boron sintered magnet that Ce substitution amount is 30% is finally made in 890 DEG C of tempering 4.5h.
The Sintered NdFeB magnet prepared is put into BH loop tester and measures its every magnetism along differently- oriented directivity
Energy index, demagnetizing curve such as Fig. 3, design parameter result are as follows：
Remanent magnetism Br=12.3kG, coercivity Hcj=12.1kOe, maximum magnetic energy product (BH)max=35.3MGOe.
From above-described embodiment, it may be seen that in Ce the content respectively magnet more than 40wt.% and 30wt.%,
The coercivity of magnet is all easily promoted and has arrived 12kOe or more, and method and process disclosed by the invention is simple, and coercivity promotes effect
Fruit is significant.
Claims (10)
1. a kind of preparation method of high-coercive force neodymium ferrocerium boron sintered magnet, which is characterized in that add and contain in master alloying powder
Rare earth compounding organic solution carries out mechanical mixing, realizes powder particle surface wetting cladding；By the powder particle warp after cladding
It crosses after orientation die mould, cold isostatic compaction, vacuum-sintering, heat treatment and obtains neodymium ferrocerium boron sintered magnet, the master alloying
Powder is the rare-earth-iron-boron magnetic alloy powder particle containing Rare-Earth Ce element.
2. preparation method according to claim 1, which is characterized in that the master alloying powder is made with the following method
?：
Blending process：Weigh raw material；
Above-mentioned raw materials are prepared into alloy sheet using induction melting and rapid hardening belt-rejecting technology；
By the alloy sheet by hydrogen is quick-fried and jet milling process, master alloying powder is made.
3. preparation method according to claim 1, which is characterized in that the solute of the organic solution mainly with Pr, Nd,
One of Tb, Dy, Ho or several rare earth elements are the organic coordination compound of ligand, are free of in the solvent of the organic solution strong
Reactive species are 95# aviation gasoline or alcoholic solution.
4. preparation method according to claim 2, which is characterized in that the ingredient of the raw material is (NdaPrbCe1-a-b)cFe100-c-d-eBdMe, wherein：M is one or more of Co, Ni, Mo, Ga, Al, Cu, Zr, Nb element, a, b, c, d meet with
Lower relationship：0≤a < 1,0≤b < 1, a+b < 1,27≤c≤34,0.8≤d≤1.3,0≤e≤3.
5. preparation method according to claim 2, which is characterized in that the raw material is using richness Ce pivot alloy and without Ce master
Induction melting is respectively adopted by rich Ce pivot alloy and without Ce pivot alloy in first alloy, band is got rid of in rapid hardening, hydrogen is quick-fried and the work of airflow milling
Skill is prepared into pivot alloy powder, mixes in proportion by rich Ce pivot alloy powder and without Ce pivot alloy powder, obtains described
The rare-earth-iron-boron mixing master alloying powder containing Rare-Earth Ce element.
6. preparation method according to claim 5, which is characterized in that rich Ce pivot alloying component is denoted as with mass percent
(NdaPrbCe1-a-b)cFe100-c-d-eBdMe, wherein：M is one or more of Co, Ni, Mo, Ga, Al, Cu, Zr, Nb element,
A, b, c, d meet following relationship：0≤a < 1,0≤b < 1, a+b < 1,27≤c≤34,0.8≤d≤1.3,0≤e≤3；It is described
No Ce pivot alloying component is (Nd by percentage to the qualitya’Pr1-a’)b’Fe100-b’-c’-d’Bc’Md’；Wherein a ', b ', c ', d ' are full
It is enough lower relationship：0≤a '≤1,27≤b '≤34,0.8≤c '≤1.3,0≤d '≤3.
7. preparation method according to claim 1, which is characterized in that the mechanical mixing is specially in nitrogen or argon
0.5~1.0h is uniformly mixed under gas shielded atmosphere in mixing equipment, the mixing equipment uses three-dimensional motion mixer.
8. preparation method according to claim 1, which is characterized in that add in every kilogram of alloy powder in the machinery mixing
Add the rare earth compounding organic solution of 1mL~100mL.
9. preparation method according to claim 1, which is characterized in that the orientation die mould in the magnetic field of 1.5~2.0T,
It is carried out under 5.5Mpa vertical magnetic field pressure；The cold isostatic compaction is carried out in 150~220MPa.
10. preparation method according to claim 1, which is characterized in that the temperature of the vacuum-sintering be 1000~
1100 DEG C, sintering time is 2~3h, is heat-treated to be tempered 3~5h at 550~950 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911077A (en) * | 2019-11-18 | 2020-03-24 | 江苏大学 | Preparation method of high-coercivity neodymium cerium iron boron magnet |
| CN114196864A (en) * | 2021-11-25 | 2022-03-18 | 江苏大学 | Y-Gd-based alloy, neodymium cerium iron boron magnet comprising same and preparation method |
| CN114823113A (en) * | 2022-04-14 | 2022-07-29 | 浙江大学 | Preparation method of high-coercivity cerium-rich rare earth permanent magnet material |
| CN115036127A (en) * | 2022-07-04 | 2022-09-09 | 赣州鑫舟永磁材料有限公司 | Method for improving high magnetic energy product of rare earth permanent magnetic material and preparation process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911077A (en) * | 2019-11-18 | 2020-03-24 | 江苏大学 | Preparation method of high-coercivity neodymium cerium iron boron magnet |
| CN110911077B (en) * | 2019-11-18 | 2021-02-12 | 江苏大学 | Preparation method of high-coercivity neodymium cerium iron boron magnet |
| CN114196864A (en) * | 2021-11-25 | 2022-03-18 | 江苏大学 | Y-Gd-based alloy, neodymium cerium iron boron magnet comprising same and preparation method |
| CN114823113A (en) * | 2022-04-14 | 2022-07-29 | 浙江大学 | Preparation method of high-coercivity cerium-rich rare earth permanent magnet material |
| CN115036127A (en) * | 2022-07-04 | 2022-09-09 | 赣州鑫舟永磁材料有限公司 | Method for improving high magnetic energy product of rare earth permanent magnetic material and preparation process thereof |
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