CN103646742B - 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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Abstract
A kind of neodymium iron boron magnetic body and preparation method thereof, this neodymium iron boron magnetic body is made up of neodymium iron boron matrix alloy and doping component, described doping component is stannum, aluminum nanoparticles, the doping of described tin nanoparticles is the 0.02% ~ 1.0% 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 preparation method that present invention additionally comprises described neodymium iron boron magnetic body。Grasping the more existing neodymium iron boron magnetic body of coercivity in neodymium iron boron magnetic body of the present invention and improve 8%-20%, operating temperature improves 30 ~ 50 DEG C, reduces heavy rare earth content and strategy metal cobalt when reaching same performance, saves production cost。
Description
Technical field
The present invention relates to a kind of magnetic material and preparation method thereof, particularly relate to a kind of compound Sintered NdFeB magnet of high-coercive force high-temperature stability adding stannum, aluminum nanoparticles and preparation method thereof。
Background technology
Sintered NdFeB magnet has significantly high remanent magnetism, magnetic energy product and coercivity, obtain the title of " magnetic king ", it it is the magnetic material that contemporary magnetic force is the strongest, it is widely used to the fields such as wind-power electricity generation, new-energy automobile, energy-saving electric machine, energy-conservation household electrical appliances, medical apparatus and instruments, computer technology, microwave communication, electronics, electroacoustic, automatization, Aero-Space, is particularly suitable for developing the various regeneration products of high-performance, miniaturization, lightness。
Along with the expansion of range of application, magnet combination property is required more and more higher, particularly temperature stability。In some motors and automation equipment, Sintered NdFeB magnet is when standing high temperature impact, and magnetic property declines rapidly, thus losing efficacy。Industrial circle is more and more stronger to the demand of the Sintered NdFeB magnet of energy continuous firing under high temperature (>=180 DEG C)。
Therefore, the operating temperature improving NdFeB material just becomes the study hotspot of magnetic material in recent years。Common practice is addition Co element in magnet, replaces Fe by Co part, and to improve the temperature stability of neodymium iron boron magnetic body, a lot of high temperature resistant magnet Co content are even up to more than 5%。But Co is added on raising Curie temperature and reduces while reversible loss, also coercivity and the remanent magnetism of magnet can be reduced, for this, need to add in magnet to improve coercitive element such as Dy, Tb, Ga, Nb etc., and the interpolation of these alloying elements can cause the reduction of magnet remanent magnetism and magnetic energy product, and it is greatly increased production cost。
CN1725394A discloses and adds nano-silicon nitride raising neodymium iron boron operating temperature and corrosion proof method in a kind of Grain-Boundary Phase: by Nd Fe B alloys and grain boundary alloys powder process respectively, add nano-silicon nitride in crystalline phase alloy, subsequently Nd Fe B alloys is mixed with crystal-boundary phase alloy, it is higher than the operating temperature of the magnet adopting dual alloy method but prepare without nano-silicon nitride and single alloyage and corrosion resistance that the steps such as mixed-powder is compressing in magnetic field, sintering tempering prepare magnet, the operating temperature of this magnet and corrosion resistance。But, the method needs to prepare matrix alloy and crystal-boundary phase alloy respectively, increases operation, composition detection difficulty；If it addition, the content of crystal-boundary phase alloy (silicon nitride is non-magnetic phase alloy) controls inaccurate, coercivity will be adversely affected。
Disclosed a kind of Nd-Fe-B permanent magnet material of CN102237166A and preparation method thereof; prepare Sintered NdFeB magnet complex process for dual alloy method in prior art, the content of Grain-Boundary Phase is difficult to control to; and the problem that list alloyage is difficult to obtain high-curie temperature and high-coercive force; the method adopting doping preparation; adulterate 0.02wt%-3wt% nanometer silicon carbide after Nd Fe B alloys airflow milling powder, subsequently by compressing to hybrid particles batch mixing, magnetic field and sintering tempering thus preparing elevated operating temperature and coercitive neodymium iron boron magnetic body。But, in the method, nanometer silicon carbide is also non-magnetic phase, different from matrix alloy characteristic, controls in inaccurate situation at content, and magnet coercivity can worsen rapidly, and magnet becomes fragile, and during machining, percent defective increases。
Sintered Nd-Fe-B permanent magnetic material that processing characteristics disclosed in CN101383210A is good and the method improving its processing work performance, it adds the stannum of 0.05wt%-1.2wt% when neodymium iron boron closes melting, thus obtaining the Nd-Fe-B permanent magnet material that a kind of processing characteristics is good。The method utilizes on the one hand has certain dissolubility during high temperature sintering in principal phase, thus weakening the demagnetizing effect of intercrystalline spin-exchange-coupled, makes coercivity improve；Adding stannum on the other hand and can reduce alloy grain corner angle, increase the wettability of rich neodymium phase and matrix, strengthen the combination of matrix and rich neodymium phase, reducing transgranular fracture occurrence probability thus improving magnet processing characteristics。But the method individually adds stannum, magnet coercivity promotes limited, and magnetic energy product and remanent magnetism reduce bigger。
Disclosed a kind of heat-resistant permant magnetic Nd-Fe-B material of CN102982938A and preparation method thereof, adopt doping preparation method, the neodymium of neodymium iron boron matrix atomic percentage 25%-26.5%, the cobalt of 0.5%-1%, the silicon of 1%-1.5%, the manganese of 2%-2.5%, the boron of 10%-10.5% and Yu Tie, contain the yttrium iron alloy that percentage by weight is the Dy-Fe alloy of 0.1%-0.3%, the samarium ferroalloy of 0.3%-0.5%, 1.5%-2.5% simultaneously；After matrix alloy powder process, yttrium iron alloy is mixed with nano silica fume doping, suppress through overmolding, sinter and make。But the method also exists magnetic energy product and remanent magnetism to be reduced serious, containing strategy metal cobalt, the shortcoming such as relatively costly。
JP07130522 (1995-5-19) disclosed " permanent magnet manufacture method ", the coercive force temperature coefficient of Nd-Dy-Fe-Al-B alloy just can be made to reduce rapidly with a small amount of stannum (0.1wt%), irreversible loss reduces, and magnet operating temperature brings up to more than 250 DEG C。But dysprosium content is higher in the method magnet, production cost increases, and high-temp magnetic performance improvement but agnetic property at room temperature m reduce bigger。
In sum, the method improving Nd-Fe-B permanent magnet material coercivity and operating temperature at present usually contains heavy rare earth dysprosium or terbium, the rare strategy metal cobalt of high level, or adopt control complicated, easily counteractive addO-on therapy occurs, have that agnetic property at room temperature m is relatively low, cost of material is high or the problem such as complex process。
Summary of the invention
The technical problem to be solved is, overcomes the drawbacks described above that prior art exists, it is provided that a kind of heavy rare earth content is low, workable, neodymium iron boron magnetic body preparing high-coercive force high-temperature stability sintering of low cost of manufacture and preparation method thereof。
The technical solution adopted for the present invention to solve the technical problems is:
The neodymium iron boron magnetic body of the present invention, is made up of neodymium iron boron matrix alloy and doping component, and described doping component is stannum, aluminum nanoparticles, and the doping of described tin nanoparticles is the 0.02% ~ 1.0%(preferably 0.04% ~ 0.8% of neodymium iron boron matrix alloy weight；More preferably 0.05%～0.5%), the doping of aluminum nanoparticles is the 0.03% ~ 3.0%(preferably 0.04% ~ 1.5% of neodymium iron boron matrix alloy weight；More preferably 0.05%～1.0%)。
Further, the chemical formula of described neodymium iron boron matrix alloy is ((PrNd)1-mREm)xFe1-x-y-zMyBzIn formula, RE is one or both mixture (the preferred Dy in Dy, Tb, Ho, Gd, or any one or multiple mixture in Dy and other three kinds of Tb, Ho, Gd), M is the mixture of one or more in addition element Ga, Nb, Co, Cu, Mn, Zr, Ti, V, 0.05%≤m≤10%, 26.68%≤x≤35.0%, 0.05%≤y≤10%, 1.0%≤z≤1.1%, described percentage ratio is all weight percentage。
Further, described stannum, aluminum nanoparticles mean diameter be 100-500nm。
The preparation method of the neodymium iron boron magnetic body of the present invention, comprises the steps:
1) melting: adopt smelting technology to prepare neodymium iron boron matrix alloy；
2) powder process: prepared neodymium iron boron matrix alloy carries out coarse crushing, adds the antioxidant of 0.02wt%-0.70wt%, and then airflow milling makes the neodymium iron boron matrix alloy powder that mean diameter is 3-5 μm；
3) doping and batch mixing: by the stannum of mean diameter 100-500nm, aluminum nanoparticles add step 2) described in neodymium iron boron matrix alloy powder in, stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.02% ~ 1.0% and 0.03% ~ 3.0%, and in batch mixer batch mixing 2-5h；
4) compressing: by the orientation compressing in pulsed magnetic field of the powder after Homogeneous phase mixing, after being pressed into blank, to carry out isostatic cool pressing；
5) sintering and tempering: the blank after isostatic cool pressing is put into sintering 3-5h in the high vacuum sintering furnace of 1020-1130 DEG C, carries out tempering, insulation after sintering, added by air quenching air-cooled subsequently, be cooled to less than 70 DEG C and come out of the stove。
Further, in step 1), described smelting technology prepares neodymium iron boron matrix alloy, is the neodymium iron boron matrix alloy thin slice adopting the prepared thickness of rapid hardening belt-rejecting technology to be 0.2-0.5mm, or adopts casting ingot process to prepare neodymium iron boron matrix alloy ingot casting。
Further, step 2) in, described coarse crushing is that neodymium iron boron matrix alloy step 1) prepared passes through crusher in crushing, ball milling, or is broken into the granule of 60-100 order by the broken technique of hydrogen。
Further, in step 3), described stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.04% ~ 0.8% and 0.04% ~ 1.5%。
Further, the 0.05% ~ 0.5% and 0.05% ~ 1.0% of the doping ratio respectively neodymium iron boron matrix alloy weight of stannum described in step 3), aluminum。。
Further, in step 4), the intensity >=1.8T of described pulsed magnetic field, the pressure of isostatic cool pressing is 150-250MPa, and after isostatic pressed, blank density is 3.0-4.2g/cm3。
Further, in step 5), described tempering is a tempering or first carries out a tempering, then carries out double tempering, and a described tempering carries out at 650-920 DEG C, is incubated 2.5-5h, and double tempering carries out at 450-650 DEG C, is incubated 2.5-5h。
Stannum, the mean diameter of aluminum nanoparticles and heat treating regime are to final performance important。If the mean diameter too small (less than 100nm) of the stannum of doping, aluminum nanoparticles, then stannum, aluminum nanoparticles cannot be mixed homogeneously with neodymium iron boron matrix alloy powder, cause stannum, aluminum nanoparticles to reunite；Whereas if the mean diameter of the stannum of doping, aluminum nanoparticles is excessive, then do not have the purpose being evenly coated on neodymium iron boron matrix alloy granule；Alloy containing Sn (such as carries out first time tempering) when unsuitable heat treatment between 525 DEG C-625 DEG C after sintering, it will cause precipitating out in alloy α-Fe, so that coercivity is also lower than sintered state。
Research shows, the addition of Dy, Al can weaken the negative effect of Sn。
The interpolation of Dy increases anisotropy field HAWith crystal grain thinning: Al can improve microstructure, make alloy grain refine, make the lumpiness of rich-Nd phase and rich B phase diminish simultaneously, become Dispersed precipitate more；Sn makes crystal boundary richness neodymium phase and matrix wettability improve, thus reducing crystal grain wedge angle, the passivation of sharp rib and intergranular magnetic coupling interaction, makes topically effective demagnetizing factor NeffReduce, and then make topically effective demagnetizing field reduce；The reason of more than 150 DEG C alloy coercivity heat stability improvement is, after doping Sn, main phase grain defines more efficiently pinning center, when under outside magnetic field or high temperature, when magnetic domain deflects, play pinning effect, stop domain wall deflection or mobile, be conducive to the formation of high-coercive force, and then improve the operating temperature of permanent magnet material。Therefore, Dy+Al+Sn is more notable to the effect improving NdFeB magnet HCJ and temperature stability。
The invention has the beneficial effects as follows: 1) by preparation method of adulterating, compound adds stannum, aluminum nanoparticles has prepared the neodymium iron boron magnetic body that high-coercive force high-temperature stability sinters, reach in same performance situation heavy rare earth content compared with traditional method to be substantially reduced, reduce production cost, save strategy metal cobalt simultaneously；2) by adding while stannum, aluminum nanoparticles, decrease the porosity in neodymium iron boron magnetic body, be effectively increased the magnetic flux density of neodymium iron boron magnetic body；3) by specific heat treatment mode, improve the coercivity of magnet, make neodymium iron boron magnetic body operating temperature improve more than 30 ~ 50 DEG C, be greatly expanded the application of Sintered NdFeB magnet。
Detailed description of the invention
Below by way of specific embodiment, the present invention is described in further detail; but these embodiments must not be used for being construed to limiting the scope of the invention, all within the scope of technical solution of the present invention basic ideas or be essentially equivalent to the change of technical solution of the present invention and be protection scope of the present invention。
Embodiment 1
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd24.5Pr6Dy2Fe68.4Cu0.1B1.03, stannum, aluminum doping respectively neodymium iron boron matrix alloy weight 0.15% and 0.3%。
Preparation: comprise the steps: the purity raw material more than 99%, be Nd by nominal composition24.5Pr6Dy2Fe68.4Cu0.1B1.03Carry out proportioning, adopt rapid hardening belt-rejecting technology to make the thick Nd Fe B alloys thin slice of 0.25-0.35mm, make the powder that mean diameter is 3-5 μm by " hydrogen broken+airflow milling " technique, and after hydrogen is broken, before airflow milling, adds the antioxidant of 0.3%；The stannum of mean diameter 100nm, aluminum nanoparticles are joined in described neodymium iron boron matrix alloy powder, stannum, aluminum the percentage by weight 0.15% and 0.3% of doping ratio respectively matrix alloy, batch mixing 4h in batch mixer；By the orientation compressing in the pulsed magnetic field of 2.5T of the powder after Homogeneous phase mixing, under 200MPa pressure, after being pressed into blank, carry out isostatic cool pressing；Base substrate is put in high vacuum sintering furnace and sinters 4h in 1080 DEG C, perform twice at tempering at 850 DEG C × 2.5h+580 DEG C × 3h subsequently, after add air-cooled by air quenching, be cooled to less than 70 DEG C and come out of the stove, be i.e. acquisition sintered magnet A1。
Embodiment 2
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd27Dy6Fe65.6Nb0.25Cu0.15B1.1, stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.15% and 0.4%。
The preparation method of neodymium iron boron magnetic body, comprises the steps: the purity raw material more than 99%, is Nd by nominal composition27Dy6Fe65.6Nb0.25Cu0.15B1.1Proportioning, adopts rapid hardening belt-rejecting technology to make the thick Nd Fe B alloys thin slice of 0.25-0.35mm；By " hydrogen broken+airflow milling " technique Nd Fe B alloys thin slice is milled into the powder that mean diameter is 3-5um, and is the antioxidant of 0.30wt% added with addition after hydrogen is broken, before airflow milling；The stannum of mean diameter 200nm, aluminum nanoparticles are joined in described neodymium iron boron matrix alloy powder, stannum, aluminum the percentage by weight 0.15% and 0.4% of doping ratio respectively matrix alloy, batch mixing 4h in batch mixer；By the orientation compressing in the pulsed magnetic field of 2.5T of the powder after Homogeneous phase mixing, under slug press 200MPa pressure subsequently, carry out isostatic cool pressing；Base substrate is put in high vacuum sintering furnace and sinters 4h in 1080 DEG C, perform twice at tempering at 850 DEG C × 2.5h+580 DEG C × 3h subsequently, after add air-cooled by air quenching, be cooled to less than 70 DEG C and come out of the stove, be i.e. acquisition sintered magnet A2。
Embodiment 3
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd20Pr7Dy4Fe67.07Ga0.4Nb0.3Cu0.2B1.03, stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.15% and 0.2%。
The preparation method of neodymium iron boron magnetic body, comprises the steps: the purity raw material more than 99%, by nominal composition Nd20Pr7Dy4Fe67.07Ga0.4Nb0.3Cu0.2B1.03Proportioning, adopts rapid hardening belt-rejecting technology to make the thick Nd Fe B alloys thin slice of 0.25-0.35mm；By " hydrogen broken+airflow milling " technique Nd Fe B alloys thin slice is milled into the powder that mean diameter is 3-5um, and is the antioxidant of 0.30wt% added with addition after hydrogen is broken, before airflow milling；The stannum of mean diameter 200nm, aluminum nanoparticles are joined in described neodymium iron boron matrix alloy powder, stannum, aluminum the percentage by weight 0.15% and 0.2% of doping ratio respectively matrix alloy, batch mixing 4h in batch mixer；By the orientation compressing in the pulsed magnetic field of 2.5T of the powder after Homogeneous phase mixing, under slug press 200MPa pressure subsequently, carry out isostatic cool pressing；Base substrate is put in high vacuum sintering furnace and sinters 4h in 1070 DEG C, carry out a tempering at 850 DEG C × 3h subsequently, after carry out air quenching and add air-cooled, be cooled to less than 70 DEG C and come out of the stove, be i.e. acquisition sintered magnet A3。
Embodiment 4
The chemical formula of the present embodiment neodymium iron boron matrix alloy is Nd27Tb2Dy3Fe65.97Ga0.3Nb0.3Zr0.2Cu0.2B1.03, stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.15% and 0.2%。
Preparation method: comprise the steps: the purity raw material more than 99% by nominal composition to be Nd27Tb2Dy3Fe65.97Ga0.3Nb0.3Zr0.2Cu0.2B1.03Proportioning, adopts rapid hardening belt-rejecting technology to make the thick Nd Fe B alloys thin slice of 0.25-0.35mm；By " hydrogen broken+airflow milling " technique Nd Fe B alloys thin slice is milled into the powder that mean diameter is 3-5um, and is the antioxidant of 0.30wt% added with addition after hydrogen is broken, before airflow milling；The stannum of mean diameter 200nm, aluminum nanoparticles are joined in described neodymium iron boron matrix alloy powder, stannum, aluminum the percentage by weight 0.15% and 0.2% of doping ratio respectively matrix alloy, batch mixing 4h in batch mixer；By the orientation compressing in the pulsed magnetic field of 2.5T of the powder after Homogeneous phase mixing, under slug press 200MPa pressure subsequently, carry out isostatic cool pressing；Base substrate is put in high vacuum sintering furnace and sinters 4h in 1070 DEG C, carry out a tempering at 850 DEG C × 3h subsequently, after added by air quenching and air-cooled to come out of the stove to less than 70 DEG C, i.e. acquisition sintered magnet A4。
Neodymium iron boron magnetic body A prepared by above-described embodiment 1 ~ embodiment 41-A4With existing neodymium iron boron magnetic body B1-B4Carry out different operating temperature curve respectively and measure magnetic property and maximum operating temperature mensuration。Wherein neodymium iron boron magnetic body B1It is distinctive in that with embodiment 1, B1Nd for undoped p stannum, aluminum nanoparticles22.5Pr6Dy2Fe66.37Cu0.1B1.03, carry out a tempering 910 DEG C after sintering, carry out double tempering 500 DEG C after insulation 2.5h, be incubated 5h；Neodymium iron boron magnetic body B2It is distinctive in that with embodiment 2, B2Nd for undoped p stannum, aluminum nanoparticles27Dy6Fe65.6Nb0.25Cu0.15B1.1, carry out a tempering 910 DEG C after sintering, carry out double tempering 500 DEG C after insulation 2.5h, be incubated 5h；Neodymium iron boron magnetic body B3It is distinctive in that with embodiment 3, B3Nd for undoped p stannum, aluminum nanoparticles20Pr7Dy4Fe67.07Ga0.4Nb0.3Cu0.2B1.03, carry out a tempering 910 DEG C after sintering, carry out double tempering 510 DEG C after insulation 2.5h, be incubated 5h；Neodymium iron boron magnetic body B4It is distinctive in that with embodiment 4, B4Nd for undoped p stannum, aluminum nanoparticles27Tb2Dy3Fe65.97Ga0.3Nb0.3Zr0.2Cu0.2B1.03, carry out a tempering 910 DEG C after sintering, carry out double tempering 500 DEG C after insulation 2.5h, be incubated 5h。
After neodymium iron boron magnetic body is increased to a certain temperature from room temperature and returns to room temperature when measuring by the maximum operating temperature of neodymium iron boron magnetic body, flux irreversible loss hirr is less than 3%, then this temperature is exactly the maximum operating temperature of neodymium iron boron magnetic body, and measurement result is as shown in table 1。Visible, to grasp coercivity in magnet of the present invention than the neodymium iron boron magnetic body being provided without the method and improve 8%-20%, operating temperature improves 30 ~ 50 DEG C, and remanent magnetism and magnetic energy product change are little simultaneously。
Claims (7)
1. a neodymium iron boron magnetic body, it is characterized in that, it is made up of neodymium iron boron matrix alloy and doping component, described doping component is stannum, aluminum nanoparticles, the doping of described tin nanoparticles is the 0.02% ~ 1.0% 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 described neodymium iron boron matrix alloy is ((PrNd)1-mREm)xFe1-x-y-zMyBzIn formula, RE is one or both the mixture in Dy, Tb, Ho, Gd, and Dy is essential elements, M is the mixture of one or more in addition element Ga, Nb, Cu, Mn, Zr, Ti, V, and Ga and/or Nb is essential elements, 0.05%≤m≤10%, 26.68%≤x≤35.0%, 0.05%≤y≤10%, 1.0%≤z≤1.1%, each percentage ratio is all weight percentage；
The preparation method of described neodymium iron boron magnetic body, comprises the steps:
1) melting: adopt smelting technology to prepare neodymium iron boron matrix alloy；
2) powder process: prepared neodymium iron boron matrix alloy carries out coarse crushing, adds the antioxidant of 0.02wt%-0.70wt%, and then airflow milling makes the neodymium iron boron matrix alloy powder that mean diameter is 3-5 μm；
3) doping and batch mixing: by the stannum of mean diameter 100-500nm, aluminum nanoparticles add step 2) described in neodymium iron boron matrix alloy powder in, stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.02% ~ 1.0% and 0.03% ~ 3.0%, and in batch mixer batch mixing 2-5h；
4) compressing: by the orientation compressing in pulsed magnetic field of the powder after Homogeneous phase mixing, after being pressed into blank, to carry out isostatic cool pressing；
5) sintering and tempering: the blank after isostatic cool pressing is put into sintering 3-5h in the high vacuum sintering furnace of 1020-1130 DEG C, carries out tempering, insulation after sintering, added by air quenching air-cooled subsequently, be cooled to less than 70 DEG C and come out of the stove。
2. neodymium iron boron magnetic body according to claim 1, it is characterised in that the mean diameter of the nano-particle of described stannum and aluminum is 100-500nm。
3. neodymium iron boron magnetic body according to claim 1 and 2, it is characterized in that, in the step 1) of described preparation method, described smelting technology is the neodymium iron boron matrix alloy thin slice adopting the prepared thickness of rapid hardening belt-rejecting technology to be 0.2-0.5mm, or adopts casting ingot process to prepare neodymium iron boron matrix alloy ingot casting。
4. neodymium iron boron magnetic body according to claim 1 and 2, it is characterized in that, the step 2 of described preparation method) in, described coarse crushing is the powder particle that prepared neodymium iron boron matrix alloy is broken into 60-100 order by the broken technique of crusher in crushing and ball-milling technology or hydrogen。
5. neodymium iron boron magnetic body according to claim 3, it is characterized in that, the step 2 of described preparation method) in, described coarse crushing is the powder particle that prepared neodymium iron boron matrix alloy is broken into 60-100 order by the broken technique of crusher in crushing and ball-milling technology or hydrogen。
6. neodymium iron boron magnetic body according to claim 1 and 2, it is characterised in that in the step 3) of described preparation method, described stannum, aluminum doping ratio respectively neodymium iron boron matrix alloy weight 0.04% ~ 0.8% and 0.04% ~ 1.5%。
7. neodymium iron boron magnetic body according to claim 1 and 2, it is characterized in that, in the step 5) of described preparation method, described tempering is a tempering, or first carrying out a tempering, carry out double tempering again, a described tempering carries out at 650-920 DEG C, it is incubated 2.5-5h, double tempering carries out at 450-650 DEG C, is incubated 2.5-5h。
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| CN1717756A (en) * | 2003-10-31 | 2006-01-04 | Tdk株式会社 | Method for producing sintered rare earth element magnet |
| CN102543343A (en) * | 2011-12-31 | 2012-07-04 | 北京工业大学 | Aluminium nano particle doping method-prepared sintered neodymium-iron-boron-based permanent-magnet material with high coercive force and high corrosion resistance, and preparation method |
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| JPH06340902A (en) * | 1993-06-02 | 1994-12-13 | Shin Etsu Chem Co Ltd | Production of sintered rare earth base permanent magnet |
| CN1717756A (en) * | 2003-10-31 | 2006-01-04 | Tdk株式会社 | Method for producing sintered rare earth element magnet |
| CN102543343A (en) * | 2011-12-31 | 2012-07-04 | 北京工业大学 | Aluminium nano particle doping method-prepared sintered neodymium-iron-boron-based permanent-magnet material with high coercive force and high corrosion resistance, and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108269665A (en) * | 2017-12-27 | 2018-07-10 | 宁波招宝磁业有限公司 | A kind of neodymium iron boron magnetic body and preparation method thereof |
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| CN103646742A (en) | 2014-03-19 |
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