CN108269665A - A kind of neodymium iron boron magnetic body and preparation method thereof - Google Patents
A kind of neodymium iron boron magnetic body and preparation method thereof Download PDFInfo
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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
- 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
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- 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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Abstract
A kind of neodymium iron boron magnetic body, it is made of neodymium iron boron matrix alloy and doping component, the doping component is gallium, aluminum nanoparticles, the doping of the gallium nano particle is the 0.5%~2.5% of neodymium iron boron matrix alloy weight, and the doping of aluminum nanoparticles is the 0.03%~3.0% of neodymium iron boron matrix alloy weight；The chemical formula of the neodymium iron boron matrix alloy is ((PrNd)1‑mREm)xFe1‑x‑y‑zMyBzRE is mixtures one or more of in Dy, Tb, Ho, Gd in formula, and Dy is essential elements, M is one or more of mixtures in addition element Nb, Cu, Mn, Zr, Ti, V, and Nb is essential elements, 0.05%≤m≤10%, 26.68%≤x≤35.0%, 0.05%≤y≤10%, 1.0%≤z≤1.1%, each percentage are weight percentage.Doping improves magnet operating temperature.
Description
Technical field
The present invention relates to a kind of magnetic material and preparation method thereof, more specifically, it relates to a kind of neodymium iron boron magnetic body and
Preparation method.
Background technology
Sintered NdFeB magnet has very high remanent magnetism, magnetic energy product and coercivity, obtains the title of " magnetic king ", is contemporary magnetic
The most strong magnetic material of power, be widely used to wind-power electricity generation, new-energy automobile, energy-saving electric machine, energy saving household electrical appliances, medical instrument,
The fields such as computer technology, microwave communication, electronics, electroacoustic, automation, aerospace are particularly suitable for developing high-performance, small-sized
Change, the various regeneration products of lightness.
With the expansion of application range, higher and higher, particularly temperature stability is required magnet comprehensive performance.At some
In motor and automation equipment, when being subjected to high temperature impact, magnetic property declines rapidly Sintered NdFeB magnet, so as to fail.Work
Industry field under high temperature (>=180 DEG C) can continuous firing and the excellent Sintered NdFeB magnet of magnetic property demand it is more and more stronger
It is strong.
In order to improve its temperature stability, improving the room temperature coercivity of sintered Nd-Fe-B permanent magnetic material and reduce sintering neodymium iron
The remanent magnetism of boron and the absolute value of coercive force temperature coefficient are a kind of effective methods.
At present, improving the coercitive method of sintered NdFeB in the industrial production is mainly：Heavy rare earth dysprosium or terbium is direct
By melting addition in master alloy, the sintering neodymium iron with high-coercive force is then prepared into using traditional powder metallurgical technique
Boron magnet.This is because Dy2Fe14B or Tb2Fe14B compares Nd2Fe14B has higher magnetocrystalline anisotropy field, so as to improve sintering
The coercivity of neodymium iron boron.However, when heavy rare earth dysprosium element and terbium element are directly added in master alloy, the dysprosium of addition or terbium element
It is almost evenly distributed in the crystal grain and crystal boundary of sintered NdFeB, since heavy rare earth element dysprosium and terbium atom have with iron atom
The property of antiferromagnetic coupling, this addition for allowing for heavy rare earth element can significantly reduce the remanent magnetism and magnetic energy of sintered NdFeB
Product, so that cannot obtain by this method while there is high-coercive force and the magnet of high energy product.
According to existing research shows that the coercivity of NdFeB magnet sintered magnets is structure sensitive parameter.Pairing gold process
Addition heavy rare earth hydride, rare earth oxide and rare earth fluoride can effectively control most of heavy rare earth elements to be distributed in
Near the crystal boundary of Nd 2Fe 14B phases, the shell layer structure with high magnetocrystalline anisotropy field is formed.Nd 2Fe 14B systems rare earth
The coercivity mechanism of permanent magnetism is forming core type, the shell layer structure of high magnetocrystalline anisotropy can effectively prevent magnetic reversal area into
Core, so as to improve coercivity.
However the method that heavy rare earth hydride, heavy rare-earth oxide and heavy rare earth fluoride are added by pairing gold process
While forming shell layer structure can in magnet residual fraction hydrogen atom, oxygen atom and fluorine atom, these remaining hydrogen it is former
Son, oxygen atom and fluorine atom can deteriorate the magnetic property of magnet to a certain extent, simultaneously as rare earth hydride, rare earth oxygen
Compound, the fusing point of rare earth fluoride are higher, are unfavorable for the densified sintering product of final magnet, in addition, pairing gold process adds heavy rare earth
Hydride, heavy rare-earth oxide and heavy rare earth fluoride are weaker to the effect for improving the temperature stability of sintered NdFeB.
Therefore a kind of new Sintered NdFeB magnet and its system with high-coercive force and higher temperature stability is provided
Preparation Method is those skilled in the art's problem to be solved.
Invention content
The object of the present invention is to provide a kind of heavy rare earth content is low, operability is strong, manufactures and at low cost prepare high coercive
Power high-temperature stability Sintered NdFeB magnet and preparation method thereof.
To achieve the above object, it is realized by following technological means：
A kind of neodymium iron boron magnetic body is made of neodymium iron boron matrix alloy and doping component, and the doping component is gallium, aluminium nanometer
Particle, the doping of the gallium nano particle are the 0.5%~2.5% of neodymium iron boron matrix alloy weight, and aluminum nanoparticles are mixed
Miscellaneous amount is the 0.03%~3.0% of neodymium iron boron matrix alloy weight；The chemical formula of the neodymium iron boron matrix alloy is ((PrNd)1- mREm)xFe1-x-y-zMyBz, RE is the mixture of one or more of Dy, Tb, Ho, Gd in formula, and Dy is essential elements, and M is
The mixture of one or more of addition element Nb, Cu, Mn, Zr, Ti, V, and Nb be essential elements, 0.05%≤m≤
10%, 26.68%≤x≤35.0%, 0.05%≤y≤10%, 1.0%≤z≤1.1%, each percentage are weight percent
Than.
A kind of method for preparing the neodymium iron boron magnetic body, which is characterized in that include the following steps：
1) melting：Neodymium iron boron matrix alloy is made using smelting technology；
2) powder processed：Neodymium iron boron matrix alloy obtained is subjected to coarse crushing, then air-flow is milled into average grain diameter as 3~5 μ
The neodymium iron boron matrix alloy powder of m；
3) doping and batch mixing：Gallium, aluminum nanoparticles are added in the neodymium iron boron matrix alloy powder described in step 2), and
2~5h of batch mixing in batch mixer；
4) compression moulding：Uniform mixed powder is orientated simultaneously compression moulding in pulsed magnetic field, after being pressed into blank
Carry out isostatic cool pressing；
5) it is sintered and is tempered：Blank after isostatic cool pressing is put into 1000~1100 DEG C of high vacuum sintering furnace and is sintered 3
~5h is tempered after sintering, is kept the temperature, and is then added by air quenching air-cooled, is cooled to less than 70 DEG C and is come out of the stove.
Advanced optimize for：Smelting technology in the step 1) is that neodymium iron boron matrix is made using rapid hardening belt-rejecting technology to close
Neodymium iron boron matrix alloy ingot casting is made using casting ingot process in golden thin slice.
Advanced optimize for：The thickness of the neodymium iron boron matrix alloy thin slice be 0.2~0.5mm, the neodymium iron boron matrix
The thickness of alloy cast ingot is less than or equal to 27mm.
Advanced optimize for：Coarse crushing in the step 2) is to break neodymium iron boron matrix alloy obtained by crusher
Broken and ball-milling technology or hydrogen break technique and are broken into 60~100 mesh powder particles.
Advanced optimize for：Gallium in the step 3), aluminum nanoparticles average grain diameter be 100~500nm.
Advanced optimize for：Tempering in the step 5) is first tempered for primary tempering or once, carries out two again
Secondary tempering, the primary tempering carry out at 850~950 DEG C, keep the temperature 2.5~5h, and double tempering carries out at 400~650 DEG C,
Keep the temperature 2.5~5h.
The present invention utilizes the low-melting characteristic of gallium so that doping particle gallium melts first in the magnet that gallium, aluminium adulterate, shape
Into melting triggering center, aluminium melting is then driven, gallium, the aluminium of melting surround the periphery distribution of neodymium iron boron matrix alloy particle, shape
Into the structure of gallium, aluminium cladding neodymium iron boron matrix alloy particle.Gallium causes crystal boundary richness neodymium phase and matrix wetability to improve, so as to reduce
Crystal grain wedge angle, the passivation of sharp rib and intergranular magnetic coupling interaction so that topically effective demagnetizing factor NeffReduce, and then make topically effective
Demagnetizing field reduces；Aluminium can improve microscopic structure, refine alloy grain, while the lumpiness of rich neodymium phase and boron-rich phase is made to become smaller,
Become more Dispersed precipitate；The addition of dysprosium increases anisotropy field HAAnd crystal grain thinning；150 DEG C or more alloy coercivity thermostabilizations
Property the reason of improving be to form more efficiently pinning center after doped gallium in main phase grain, when under external magnetic field and high temperature,
When magnetic domain deflects, pinning effect is played, neticdomain wall deflection or mobile is prevented, is conducive to the formation of high-coercive force, Jin Erti
The operating temperature of high magnet.Therefore, Dy+Ga+Al is to improving the effect of NdFeB magnets intrinsic coercivity and temperature stability more
Significantly.
In the present invention, gallium, the average grain diameter of aluminum nanoparticles and heat treating regime have final performance important shadow
It rings.If the average grain diameter of the gallium of doping, aluminum nanoparticles is too small (being less than 100nm), gallium, aluminum nanoparticles and neodymium iron boron base
Body alloy powder can not be mixed uniformly, and gallium, aluminum nanoparticles is caused to reunite；, whereas if the gallium of doping, aluminum nanoparticles is flat
Equal grain size is excessive, then does not have the purpose being evenly coated on neodymium iron boron matrix alloy particle.
The advantages of the present invention over the prior art are that：1) by adulterating preparation method, compound addition gallium, aluminium nanometer
The neodymium iron boron magnetic body of high-coercive force high-temperature stability sintering has been made in grain, reach in the case of same performance with conventional method phase
Proportion content of rare earth substantially reduces, and reduces production cost, while has saved strategy metal cobalt；2) pass through gallium, aluminum nanoparticles
While add, reduce the porosity in neodymium iron boron magnetic body, effectively increase the magnetic flux density of neodymium iron boron magnetic body；3) pass through spy
Determine heat treatment mode, improve the coercivity of magnet, neodymium iron boron magnetic body operating temperature is made to improve 30~50 DEG C or more, is greatly expanded
The application field of Sintered NdFeB magnet.
Specific embodiment
Invention is described in further detail below by specific embodiment, following embodiment is descriptive, is not to limit
Protection scope of the present invention of property.
Embodiment 1
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd24.5Pr6Dy2Fe68.4Nb0.1Cu0.1B1.03, gallium, aluminium are mixed
Miscellaneous amount is respectively the 0.8% and 0.3% of neodymium iron boron matrix alloy weight.
It prepares：Include the following steps：Purity is more than to 99% raw material, is by nominal composition
Nd24.5Pr6Dy2Fe68.4Nb0.1Cu0.1B1.03It is matched, the neodymium iron boron of 0.25-0.35mm thickness is made of rapid hardening belt-rejecting technology
Alloy sheet, it is 3-5 μm of powder that average grain diameter, which is made, by " hydrogen breaks+airflow milling " technique, and after hydrogen is broken, airflow milling it
The preceding antioxidant for adding in 0.3wt%；Gallium, aluminum nanoparticles that average grain diameter is 100nm are added to the neodymium iron boron base
In body alloy powder, gallium, aluminium doping ratio be respectively the weight percent 0.8% and 0.3% of matrix alloy, in batch mixer
Batch mixing 4h；Uniform mixed powder in the pulsed magnetic field of 2.5T be orientated simultaneously compression moulding, is pressed into after blank
Isostatic cool pressing is carried out under 200MPa pressure；By green body be put into high vacuum sintering furnace in 1080 DEG C be sintered 4h, then 850 DEG C ×
2.5h+580 DEG C × 3h carries out double tempering, after added by air quenching air-cooled, be cooled to less than 70 DEG C and come out of the stove, that is, be sintered
Magnet A1.
Embodiment 2
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd27Dy6Fe65.6Nb0.25Cu0.15B1.1, gallium, aluminium doping
Respectively the 1.8% and 0.4% of neodymium iron boron matrix alloy weight.
It prepares：Include the following steps：Purity is more than to 99% raw material, is by nominal composition
Nd27Dy6Fe65.6Nb0.25Cu0.15B1.1It is matched, the Nd Fe B alloys of 0.25-0.35mm thickness is made of rapid hardening belt-rejecting technology
By " hydrogen breaks+airflow milling " technique the powder that average grain diameter is 3-5 μm is made, and add after hydrogen is broken, before airflow milling in thin slice
Enter the antioxidant of 0.3wt%；Gallium, aluminum nanoparticles that average grain diameter is 200nm are added to the neodymium iron boron matrix to close
In bronze end, gallium, aluminium doping ratio be respectively the weight percent 1.8% and 0.3% of matrix alloy, the batch mixing in batch mixer
4h；Uniform mixed powder in the pulsed magnetic field of 2.5T is orientated simultaneously compression moulding, is pressed after being pressed into blank in 200MPa
Isostatic cool pressing is carried out under power；Green body is put into high vacuum sintering furnace and is sintered 4h in 1080 DEG C, then in 850 DEG C × 2.5h+580
DEG C × 3h carries out double tempering, after added by air quenching air-cooled, be cooled to less than 70 DEG C and come out of the stove, is i.e. acquisition sintered magnet A2.
Embodiment 3
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd20Pr7Dy4Fe67.07Nb0.3Cu0.2Mn0.4B1.03, gallium, aluminium
Doping ratio be respectively the 2% and 0.2% of neodymium iron boron matrix alloy weight.
The preparation method of neodymium iron boron magnetic body, includes the following steps：：Purity is more than to 99% raw material, by nominal composition
Nd20Pr7Dy4Fe67.07Nb0.3Cu0.2Mn0.4B1.03The neodymium iron boron of 0.25-0.35mm thickness is made of rapid hardening belt-rejecting technology for proportioning
Alloy sheet；Nd Fe B alloys thin slice is milled by the powder that average grain diameter is 3-5um by " hydrogen broken+airflow milling " technique, and
And after hydrogen is broken, before airflow milling added with the antioxidant that addition is 0.30wt%；The gallium of average grain diameter 300nm, aluminium are received
Rice grain is added in the neodymium iron boron matrix alloy powder, tin, aluminium doping ratio be respectively the weight hundred of matrix alloy
Divide ratio 2% and 0.2%, the batch mixing 4h in batch mixer；Uniform mixed powder is orientated and pressed in the pulsed magnetic field of 2.5T
Type is made, isostatic cool pressing is carried out under the subsequent 200MPa pressure of slug press；Green body is put into high vacuum sintering furnace in 1070 DEG C
Be sintered 4h, be then once tempered in 850 DEG C × 3h, after progress air quenching add air-cooled, be cooled to less than 70 DEG C and come out of the stove, i.e.,
Obtain sintered magnet A3.
Embodiment 4
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd27Tb2Dy3Fe65.97Nb0.3Zr0.2Cu0.2B1.03, gallium, aluminium
Doping ratio be respectively the 2.5% and 3% of neodymium iron boron matrix alloy weight.
The preparation method of neodymium iron boron magnetic body, includes the following steps：：It is by nominal composition by raw material of the purity more than 99%
Nd27Tb2Dy3Fe65.97Nb0.3Zr0.2Cu0.2B1.03The neodymium iron boron of 0.25-0.35mm thickness is made of rapid hardening belt-rejecting technology for proportioning
Alloy sheet；Nd Fe B alloys thin slice is milled by the powder that average grain diameter is 3-5um by " hydrogen broken+airflow milling " technique, and
And after hydrogen is broken, before airflow milling added with the antioxidant that addition is 0.30wt%；The gallium of average grain diameter 400nm, aluminium are received
Rice grain is added in the neodymium iron boron matrix alloy powder, gallium, aluminium doping ratio be respectively the weight hundred of matrix alloy
Divide ratio 2.5% and 3%, the batch mixing 4h in batch mixer；Uniform mixed powder is orientated and pressed in the pulsed magnetic field of 2.5T
Type is made, isostatic cool pressing is carried out under the subsequent 200MPa pressure of slug press；Green body is put into high vacuum sintering furnace in 1070 DEG C
Be sintered 4h, be then once tempered in 850 DEG C × 3h, after add air-cooled to less than 70 DEG C to come out of the stove by air quenching, that is, obtain
Sintered magnet A4.
Neodymium iron boron magnetic body A1-A4 prepared by above-described embodiment 1~4 and existing neodymium iron boron magnetic body B1-B4 are carried out not respectively
Magnetic property is measured with operational temperature curve and maximum operating temperature measures.Wherein neodymium iron boron magnetic body B1 and the difference of embodiment 1 exist
In B1 is the Nd undoped with gallium, aluminum nanoparticles24.5Pr6Dy2Fe68.4Nb0.1Cu0.1B1.03, primary tempering 910 is carried out after sintering
DEG C, 500 DEG C of double tempering is carried out after keeping the temperature 2.5h, keeps the temperature 5h；Difference lies in B2 is not to neodymium iron boron magnetic body B2 with embodiment 2
The Nd of doped gallium, aluminum nanoparticles27Dy6Fe65.6Nb0.25Cu0.15B1.1, primary 910 DEG C of tempering is carried out after sintering, after keeping the temperature 2.5h
500 DEG C of double tempering is carried out, keeps the temperature 5h；Difference lies in B3 is undoped with gallium, aluminium nanometer to neodymium iron boron magnetic body B3 with embodiment 3
The Nd of particle20Pr7Dy4Fe67.07Nb0.3Cu0.2Mn0.4B1.03, primary 910 DEG C of tempering is carried out after sintering, two are carried out after keeping the temperature 2.5h
Secondary 510 DEG C of tempering, keeps the temperature 5h；Difference lies in B4 is undoped with gallium, aluminum nanoparticles to neodymium iron boron magnetic body B4 with embodiment 4
Nd27Tb2Dy3Fe65.97Nb0.3Zr0.2Cu0.2B1.03, primary 910 DEG C of tempering is carried out after sintering, double tempering is carried out after keeping the temperature 2.5h
500 DEG C, keep the temperature 5h.
The magnetic property result of table 1 neodymium iron boron magnetic body A1-A4 and B1-B4
| Magnetic property | Br(kGs) | Hcj(kOe) | (BH)max(MGOe) | Maximum operating temperature (DEG C) |
| A1 | 13.6 | 18.4 | 45.5 | 140 |
| B1 | 13.5 | 14.6 | 45.2 | 80 |
| A2 | 11.4 | 27.2 | 26 | 220 |
| B2 | 11.2 | 23.1 | 26.4 | 170 |
| A3 | 12.29 | 24.1 | 32 | 190 |
| B3 | 12.12 | 22.4 | 31.6 | 160 |
| A4 | 11.85 | 28.7 | 30.8 | 230 |
| B4 | 11.20 | 25.3 | 30.4 | 180 |
Neodymium iron boron magnetic body is increased to a certain temperature from room temperature and restored by the maximum operating temperature of neodymium iron boron magnetic body when measuring
To after room temperature, flux irreversible loss hirr is less than 3%, then the temperature is exactly the maximum operating temperature of neodymium iron boron magnetic body, measures
The results are shown in Table 1.As it can be seen that the intrinsic coercivity of magnet of the present invention than do not use the method neodymium iron boron magnetic body improve 8~
20%, operating temperature improves 30~50 DEG C, while remanent magnetism and magnetic energy product variation are little.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of neodymium iron boron magnetic body, which is characterized in that be made of neodymium iron boron matrix alloy and doping component, the doping component is
Gallium, aluminum nanoparticles, the doping of the gallium nano particle are the 0.5%~2.5% of neodymium iron boron matrix alloy weight, aluminium nanometer
The doping of particle is the 0.03%~3.0% of neodymium iron boron matrix alloy weight；The chemical formula of the neodymium iron boron matrix alloy is
((PrNd)1-mREm)xFe1-x-y-zMyBz, RE is the mixture of one or more of Dy, Tb, Ho, Gd in formula, and Dy is necessity
Element, M are the mixture of one or more of addition element Nb, Cu, Mn, Zr, Ti, V, and Nb is essential elements, 0.05%
≤ m≤10%, 26.68%≤x≤35.0%, 0.05%≤y≤10%, 1.0%≤z≤1.1%, each percentage are weight
Percentage.
A kind of 2. method for preparing neodymium iron boron magnetic body described in claim 1, which is characterized in that include the following steps：
1) melting：Neodymium iron boron matrix alloy is made using smelting technology；
2) powder processed：Neodymium iron boron matrix alloy obtained is subjected to coarse crushing, it is 3~5 μm that then air-flow, which is milled into average grain diameter,
Neodymium iron boron matrix alloy powder；
3) doping and batch mixing：Gallium, aluminum nanoparticles are added in the neodymium iron boron matrix alloy powder described in step 2), and in batch mixing
2~5h of batch mixing in machine；
4) compression moulding：Uniform mixed powder in pulsed magnetic field is orientated simultaneously compression moulding, is carried out after being pressed into blank
Isostatic cool pressing；
5) it is sintered and is tempered：Blank after isostatic cool pressing is put into 3~5h of sintering in 1000~1100 DEG C of high vacuum sintering furnace,
It is tempered, kept the temperature after sintering, then added by air quenching air-cooled, be cooled to less than 70 DEG C and come out of the stove.
3. the preparation method of a kind of neodymium iron boron magnetic body according to claim 2, which is characterized in that molten in the step 1)
Sweetening process is that neodymium iron boron matrix alloy thin slice is made or neodymium iron boron matrix is made using casting ingot process using rapid hardening belt-rejecting technology to close
Golden ingot casting.
4. the preparation method of a kind of neodymium iron boron magnetic body according to claim 3, which is characterized in that the neodymium iron boron matrix closes
The thickness of golden thin slice is 0.2~0.5mm, and the thickness of the neodymium iron boron matrix alloy ingot casting is less than or equal to 27mm.
5. the preparation method of a kind of neodymium iron boron magnetic body according to claim 2, which is characterized in that thick in the step 2)
Broken is that neodymium iron boron matrix alloy obtained is broken technique by crusher in crushing and ball-milling technology or hydrogen to be broken into 60~100
Mesh powder particle.
6. a kind of preparation method of neodymium iron boron magnetic body according to claim 2, which is characterized in that gallium in the step 3),
The average grain diameter of aluminum nanoparticles is 100~500nm.
A kind of 7. preparation method of neodymium iron boron magnetic body according to claim 2, which is characterized in that returning in the step 5)
Fire is primary tempering or is first once tempered, carries out double tempering again, the primary tempering at 850~950 DEG C into
Row keeps the temperature 2.5~5h, and double tempering carries out at 400~650 DEG C, keeps the temperature 2.5~5h.
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| CN109609861A (en) * | 2018-12-18 | 2019-04-12 | 浙江中杭新材料科技有限公司 | A kind of preparation method of compound neodymium iron boron magnetic body |
| CN110379580A (en) * | 2019-06-25 | 2019-10-25 | 宁波合力磁材技术有限公司 | A kind of neodymium-iron-boron preparation and the not neodymium iron boron magnetic body of cracky |
| CN111029074A (en) * | 2019-12-30 | 2020-04-17 | 江西师范大学 | Preparation method of sintered rare earth iron boron permanent magnet material for regulating grain boundary |
| CN111180190A (en) * | 2020-01-14 | 2020-05-19 | 江西理工大学 | Method for improving magnetic property of sintered neodymium-iron-boron magnet |
| CN112712955A (en) * | 2020-12-23 | 2021-04-27 | 安徽大地熊新材料股份有限公司 | Sintered neodymium-iron-boron magnet and preparation method thereof |
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| CN109609861A (en) * | 2018-12-18 | 2019-04-12 | 浙江中杭新材料科技有限公司 | A kind of preparation method of compound neodymium iron boron magnetic body |
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| CN110379580B (en) * | 2019-06-25 | 2021-07-23 | 宁波合力磁材技术有限公司 | Preparation method of neodymium iron boron magnet and neodymium iron boron magnet not easy to damage |
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| CN112735718A (en) * | 2020-12-28 | 2021-04-30 | 安徽大地熊新材料股份有限公司 | Preparation method of high-corrosion-resistance high-coercivity sintered neodymium-iron-boron magnet |
| CN117275864A (en) * | 2023-10-08 | 2023-12-22 | 江苏普隆磁电有限公司 | Preparation method and application of high-performance neodymium-iron-boron magnet |
| CN117275864B (en) * | 2023-10-08 | 2024-05-03 | 江苏普隆磁电有限公司 | Preparation method and application of high-performance neodymium-iron-boron magnet |
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Application publication date: 20180710 |