CN103426624B - The preparation method of Nd-Fe-B permanent magnet - Google Patents
The preparation method of Nd-Fe-B permanent magnet Download PDFInfo
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- CN103426624B CN103426624B CN201310351900.6A CN201310351900A CN103426624B CN 103426624 B CN103426624 B CN 103426624B CN 201310351900 A CN201310351900 A CN 201310351900A CN 103426624 B CN103426624 B CN 103426624B
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 108
- 239000000956 alloy Substances 0.000 claims abstract description 108
- 239000000843 powder Substances 0.000 claims abstract description 49
- 238000005275 alloying Methods 0.000 claims abstract description 45
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 35
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000005245 sintering Methods 0.000 claims abstract description 20
- 238000013467 fragmentation Methods 0.000 claims abstract description 16
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000001257 hydrogen Substances 0.000 claims abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 229910000521 B alloy Inorganic materials 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 12
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000314 lubricant Substances 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- FMGSKLZLMKYGDP-USOAJAOKSA-N dehydroepiandrosterone Chemical class C1[C@@H](O)CC[C@]2(C)[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CC=C21 FMGSKLZLMKYGDP-USOAJAOKSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 abstract description 7
- 241001347978 Major minor Species 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000012071 phase Substances 0.000 description 15
- 229910052796 boron Inorganic materials 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 11
- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- 229910052779 Neodymium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 3
- 229910052692 Dysprosium Inorganic materials 0.000 description 2
- 229910052771 Terbium Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Abstract
The invention discloses a kind of preparation method of Nd-Fe-B permanent magnet, comprise the following steps: 1) choosing master alloying is Nd Fe B alloys ingot casting; 2) auxiliary alloy a, b, c is prepared; 3) melting auxiliary alloy a, b, c; 4) major-minor conjunction hydrogen fragmentation, dehydrogenation; 5) main-auxiliary alloy powder mixing; 6) grind; 7) magnetic field orientating, die mould becomes base; 8) sintering obtains Nd-Fe-B permanent magnet; The Nd-Fe-B permanent magnet that the present invention makes has the feature of low, the high remanent magnetism of cost, high-coercive force.
Description
Technical field
The present invention relates to a kind of preparation method of Nd-Fe-B permanent magnet.
Background technology
As the Nd-Fe-B rare earth permanent magnetic material of third generation rare earth permanent-magnetic material, since nineteen eighty-three is by SUMITOMO CHEMICAL metal and GM company of the U.S. first commercialized development, owing to having the feature of high remanent magnetism, high-coercive force and high energy product, be widely used in the fields such as power electronics, communication, information, motor, communications and transportation, office automation, medicine equipment, military affairs, and the application of the new high-tech product making some small-sized, highly integrated becomes possibility, if hard disk is with voice coil motor (VCM), hybrid vehicle (HEV), electric motor car etc.Meet the above market demand, we need to prepare with lower cost the neodymium iron boron magnetic body simultaneously possessing high remanent magnetism and high-coercive force.
Sintered NdFeB magnet is primarily of Nd
2fe
14b, rich-Nd phase and rich B phase composition, wherein Nd
2fe
14b is Magnetic Phase, determines remanent magnetism and magnetic energy product, and the microstructure of rich-Nd phase and magnet determines the coercive force of magnet.From the magnetic reversal mechanism of sintered NdFeB, mainly magnetic reversal farmland is in grain boundaries Nucleation Mechanism, and the border structure of Magnetic Phase and the coercive force of physical characteristic on magnet have important impact.(Dy, Tb)
2fe
14the anisotropy field of B is higher than Nd
2fe
14the anisotropy field of B, therefore adds heavy rare earth element Dy and Tb and magnet coercive force can be made to increase considerably, significantly improve the serviceability temperature of NdFeB magnet.Two alloyage is a kind of coercive force method that border structure of microstructure and Magnetic Phase by improving magnet improves magnet, and the method is with being rich in heavy rare earth element Dy, and the alloy of Tb is as auxiliary phase, and main-phase alloy composition is close to Nd
2fe
14b chemical composition metering ratio; Then major-minor phase mixed sintering, heavy rare earth element can be effectively made to be distributed in the border of main phase grain by the method, but inevitably there is part heavy rare earth element to diffuse into principal phase in the process of high temperature sintering, cause the decline of remanent magnetism, auxiliary phase can not play the effect of liquid-phase sintering simultaneously, and the compactness of magnet is poor, along with the increase of auxiliary phasor, the hole of magnet increases, and adopts traditional two alloyages to be difficult to prepare and to have high remanent magnetism, the magnet of high-coercive force simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of above prior art: the preparation method providing the Nd-Fe-B permanent magnet of low, the high remanent magnetism of a kind of cost, high-coercive force.
Technical solution of the present invention is as follows: a kind of preparation method of Nd-Fe-B permanent magnet, comprises the following steps:
1) choose master alloying, master alloying is Nd Fe B alloys ingot casting, and the mass percent of master alloying composition is Nd
xfe
100-x-y-z-xlb
yco
zcu
xl, wherein 29.2≤x≤30.5,0.95≤y≤1,1≤z≤1.2,0≤x1≤0.06;
2) prepare auxiliary alloy a, auxiliary alloy b, auxiliary alloy c, the mass percent of described auxiliary alloy a is Pr
60fe
37.81co
1.2cu
0.04b
0.95, the mass percent of auxiliary alloy b is Dy
60fe
37.81co
1.2cu
0.04b
0.95, the mass percent of auxiliary alloy c is Tb
60fe
37.81co
1.2cu
0.04b
0.95;
3) difference melting step 2) middle auxiliary alloy a, b, c prepared, obtain auxiliary alloy a ingot casting, auxiliary alloy b ingot casting, auxiliary alloy c ingot casting;
4) the three kinds of auxiliary alloy cast ingots prepared in master alloying, step 3) are carried out hydrogen fragmentation respectively, and to the master alloying powder dehydrogenation after hydrogen fragmentation and auxiliary alloy powder dehydrogenation;
5) the master alloying powder after Dehydroepiandrosterone derivative and three kinds of auxiliary alloy powders are mixed in proportion, and add lubricant, antioxidant;
6) utilize airflow milling to grind in the powder mixed, and in Gas grinding process, add oxygen to reduce the activity of particle surface;
7) powder after grinding is placed in batch mixer and is mixed, be placed in magnetic field vertical orientated, die mould becomes blank;
8) blank that die mould is good is placed in vacuum to sinter, adopts double tempering heat treatment after sintering, obtain Nd-Fe-B permanent magnet.
Be 500-550 DEG C to temperature during master alloying dehydrogenation after fragmentation in step 4), dehydrogenation time is 3.0-3.5 hour, and temperature during auxiliary alloy dehydrogenation is 350-400 DEG C, and dehydrogenation time is 1.0-1.5 hour.
In step 5) master alloying powder and three kinds of auxiliary alloy powders mixture in the percentage by weight of each component be: auxiliary alloy a0.1%-3.5%, auxiliary alloy b0.1%-3%, auxiliary alloy c0.1%-3%, all the other are master alloying; The addition of lubricant is the 0.05%-0.1% of main-auxiliary alloy powder total weight, and the addition of antioxidant is the 0-0.5% of main-auxiliary alloy powder total weight.
When utilizing airflow milling to grind in the powder mixed in step 6), the granularity after grinding is 2-8 μm; The concentration adding oxygen is 10-80ppm.
In step 7), mixing time is 60-80min, and alignment magnetic field is 1.5-2T.
When the blank that die mould is good being sintered in step 8), the temperature of sintering is 1030-1050 DEG C, sintering time is 5.0-6.5 hour, and double tempering heat treatment is specially: 860-920 DEG C insulation 3-4 hour after gas quench to room temperature, then be warming up to 460-540 DEG C insulation 3-4 hour after gas quench to room temperature.
Beneficial effect of the present invention: the assistant alloy exceeding two or more dissimilar and ratios is introduced magnet intergranular region by the present invention, give full play to the effect of each phase of sintered Nd-Fe-B, reduce the content of auxiliary phase, improve the percentage of principal phase, optimize the structure and characteristics of Grain-Boundary Phase, the element of necessity is incorporated into reasonably local distribution, the various aspects of performance of comprehensive raising magnet.
Be 500-550 DEG C to temperature during master alloying dehydrogenation after fragmentation, dehydrogenation time is 3.0-3.5 hour, auxiliary alloy 350-400 DEG C, dehydrogenation time is 1.0-1.5 hour, rich neodymium does not have complete dehydrogenation mutually, the hydrogen of trace be wherein conducive to follow-up under low sintering temperature rich neodymium just can be uniformly distributed the rich neodymium of suppression mutually in the reunion of triangle grain boundaries and segregation.
Embodiment
With specific embodiment, the present invention is described in further details below, but the present invention is not only confined to following specific embodiment.
Embodiment 1
A preparation method for Nd-Fe-B permanent magnet, comprises the following steps:
1) choose master alloying, master alloying is Nd Fe B alloys ingot casting, and the mass percent of master alloying composition is
Nd：29.2%，B：0.95%，Co：1.2%，Cu：0.05%，Fe：68.6%；
2) prepare auxiliary alloy a, auxiliary alloy b, auxiliary alloy c, the mass percent of described auxiliary alloy a composition is Pr:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy b composition is Dy:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy c composition is Tb:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%;
3) electric arc melting method melting step 2 is respectively adopted) middle auxiliary alloy a, b, c prepared, obtain auxiliary alloy a ingot casting, auxiliary alloy b ingot casting, auxiliary alloy c ingot casting;
4) the three kinds of auxiliary alloy cast ingots prepared in master alloying, step 3) are carried out hydrogen fragmentation respectively, and to the master alloying powder dehydrogenation after hydrogen fragmentation and auxiliary alloy powder dehydrogenation; Temperature during master alloying dehydrogenation is 520 DEG C, and dehydrogenation time is 3 hours, and temperature during auxiliary alloy dehydrogenation is 400 DEG C, and dehydrogenation time is 1 hour;
5) the master alloying powder after Dehydroepiandrosterone derivative and three kinds of auxiliary alloy powders are mixed in proportion, and add the lubricant of routine techniques, antioxidant, in the mixture of wherein master alloying powder and three kinds of auxiliary alloy powders, the percentage by weight of each component is: auxiliary alloy a0.8%, auxiliary alloy b0.8%, auxiliary alloy c0.4%, and all the other are master alloying; The addition of lubricant is 0.06% of main-auxiliary alloy powder total weight, and the addition of antioxidant is 0.5% of main-auxiliary alloy powder total weight;
6) airflow milling is utilized by the powder mixed to be ground to granularity for 6-8 μm; And in Gas grinding process, adding oxygen to reduce the activity of particle surface, the concentration adding oxygen is 60ppm;
7), after being placed in and mixing 80min in three-dimensional material mixer by the powder after grinding, the vertical orientated die mould of alignment magnetic field of 2T is placed in;
8) blank that die mould is good is placed in vacuum to sinter, double tempering heat treatment is adopted after sintering, the temperature of sintering is 1030 DEG C, sintering time is 5.0 hours, double tempering heat treatment is specially: after being incubated 3.5 hours at 920 DEG C, gas is quenched to room temperature, be warming up to again 540 DEG C of insulations after 4 hours gas quench to room temperature, finally obtained Nd-Fe-B permanent magnet.
Embodiment 2
A preparation method for Nd-Fe-B permanent magnet, comprises the following steps:
1) choose master alloying, master alloying is Nd Fe B alloys ingot casting, and the mass percent of master alloying composition is
Nd：30%，B：1%，Co：1%，Cu：0.06%，Fe：67.94%；
2) prepare auxiliary alloy a, auxiliary alloy b, auxiliary alloy c, the mass percent of described auxiliary alloy a composition is Pr:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy b composition is Dy:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy c composition is Tb:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%;
3) induction melting method melting step 2 is respectively adopted) middle auxiliary alloy a, b, c prepared, obtain auxiliary alloy a ingot casting, auxiliary alloy b ingot casting, auxiliary alloy c ingot casting;
4) the three kinds of auxiliary alloy cast ingots prepared in master alloying, step 3) are carried out hydrogen fragmentation respectively, and to the master alloying dehydrogenation after fragmentation, auxiliary alloy dehydrogenation, temperature during master alloying dehydrogenation after fragmentation is 550 DEG C, dehydrogenation time is 3.5 hours, temperature during auxiliary alloy dehydrogenation is 350 DEG C, and dehydrogenation time is 1.5 hours;
5) the master alloying powder after Dehydroepiandrosterone derivative and three kinds of auxiliary alloy powders are mixed in proportion, and add lubricant, antioxidant, in the mixture of wherein master alloying powder and three kinds of auxiliary alloy powders, the percentage by weight of auxiliary alloy is: auxiliary alloy a0.3%, auxiliary alloy b0.2%, auxiliary alloy c1.5%; The addition of lubricant is 0.1% of main-auxiliary alloy powder total weight, and the addition of antioxidant is 0.4% of main-auxiliary alloy powder total weight;
6) airflow milling is utilized by the powder mixed to be ground to granularity for 2-5 μm; And in Gas grinding process, adding oxygen to reduce the activity of particle surface, the concentration adding oxygen is 40ppm;
7), after being placed in and mixing 60min in three-dimensional material mixer by the powder after grinding, the vertical orientated die mould of alignment magnetic field of 1.5T is placed in;
8) blank that die mould is good is placed in vacuum to sinter, double tempering heat treatment is adopted after sintering, the temperature of sintering is 1050 DEG C, sintering time is 6 hours, double tempering heat treatment is specially: after being incubated 4 hours at 860 DEG C, gas is quenched to room temperature, be warming up to again 460 DEG C of insulations after 3 hours gas quench to room temperature, finally obtained Nd-Fe-B permanent magnet.
Embodiment 3
A preparation method for Nd-Fe-B permanent magnet, comprises the following steps:
1) choose master alloying, master alloying is Nd Fe B alloys ingot casting, and the mass percent of master alloying composition is
Nd：30.5%，B：0.98%，Co：1%，Fe：67.52%；
2) prepare auxiliary alloy a, auxiliary alloy b, auxiliary alloy c, the mass percent of described auxiliary alloy a composition is Pr:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy b composition is Dy:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%; The mass percent of auxiliary alloy c composition is Tb:60%, Fe:37.81%, Co:1.2%, Cu:0.04%, B:0.95%;
3) electric arc melting method melting step 2 is respectively adopted) middle auxiliary alloy a, b, c prepared, obtain auxiliary alloy a ingot casting, auxiliary alloy b ingot casting, auxiliary alloy c ingot casting;
4) the three kinds of auxiliary alloy cast ingots prepared in master alloying, step 3) are carried out hydrogen fragmentation respectively, and to the master alloying dehydrogenation after fragmentation, auxiliary alloy dehydrogenation, temperature during master alloying dehydrogenation after fragmentation is 500 DEG C, dehydrogenation time is 3 hours, temperature during auxiliary alloy dehydrogenation is 360 DEG C, and dehydrogenation time is 1 hour;
5) the master alloying powder after Dehydroepiandrosterone derivative and three kinds of auxiliary alloy powders are mixed in proportion, and add lubricant, antioxidant, in the mixture of wherein master alloying powder and three kinds of auxiliary alloy powders, the percentage by weight of auxiliary alloy is: auxiliary alloy a0.1%, auxiliary alloy b3%, auxiliary alloy c0.5%; The addition of lubricant is 0.08% of main-auxiliary alloy powder total weight, and the addition of antioxidant is 0.2% of main-auxiliary alloy powder total weight;
6) airflow milling is utilized by the powder mixed to be ground to granularity for 3-5 μm; And in Gas grinding process, adding oxygen to reduce the activity of particle surface, the concentration adding oxygen is 50ppm;
7), after being placed in and mixing 70min in three-dimensional material mixer by the powder after grinding, the vertical orientated die mould of alignment magnetic field of 2T is placed in;
8) blank that die mould is good is placed in vacuum to sinter, double tempering heat treatment is adopted after sintering, the temperature of sintering is 1040 DEG C, sintering time is 6.5 hours, double tempering heat treatment is specially: after being incubated 3.5 hours at 900 DEG C, gas is quenched to room temperature, be warming up to again 480 DEG C of insulations after 4 hours gas quench to room temperature, finally obtained Nd-Fe-B permanent magnet.
The magnetic property of Nd-Fe-B permanent magnet detects as follows:
| Embodiment | Br(KGs) | Hcj(KOe) | BH(MGOe) | Hk/Hcj |
| Embodiment 1 | 13.73 | 23.94 | 44.12 | 0.95 |
| Embodiment 2 | 13.68 | 24.17 | 44.08 | 0.94 |
| Embodiment 3 | 13.60 | 25.80 | 43.99 | 0.95 |
Claims (4)
1. a preparation method for Nd-Fe-B permanent magnet, is characterized in that: comprise the following steps:
1) choose master alloying, master alloying is Nd Fe B alloys ingot casting, and the mass percent of master alloying composition is Nd
xfe
100-x-y-z-xlb
yco
zcu
xl, wherein 29.2≤x≤30.5,0.95≤y≤1,1≤z≤1.2,0≤x1≤0.06;
2) prepare auxiliary alloy a, auxiliary alloy b, auxiliary alloy c, the mass percent of described auxiliary alloy a is Pr
60fe
37.81co
1.2cu
0.04b
0.95, the mass percent of auxiliary alloy b is Dy
60fe
37.81co
1.2cu
0.04b
0.95, the mass percent of auxiliary alloy c is Tb
60fe
37.81co
1.2cu
0.04b
0.95;
3) difference melting step 2) middle auxiliary alloy a, b, c prepared, obtain auxiliary alloy a ingot casting, auxiliary alloy b ingot casting, auxiliary alloy c ingot casting;
4) by master alloying, step 3) in three kinds of auxiliary alloy cast ingots preparing carry out hydrogen fragmentation respectively, and to the master alloying powder dehydrogenation after hydrogen fragmentation and auxiliary alloy powder dehydrogenation;
5) the master alloying powder after Dehydroepiandrosterone derivative and three kinds of auxiliary alloy powders are mixed in proportion, and add lubricant, antioxidant;
6) utilize airflow milling to grind in the powder mixed, and in Gas grinding process, add oxygen to reduce the activity of particle surface;
7) powder after grinding is placed in batch mixer and is mixed, be placed in magnetic field vertical orientated, die mould becomes blank;
8) blank that die mould is good is placed in vacuum to sinter, adopts double tempering heat treatment after sintering, obtain Nd-Fe-B permanent magnet;
Step 4) in be 500-550 DEG C to temperature during master alloying dehydrogenation after fragmentation, dehydrogenation time is 3.0-3.5 hour, and temperature during auxiliary alloy dehydrogenation is 350-400 DEG C, and dehydrogenation time is 1.0-1.5 hour;
Step 5) in master alloying powder and three kinds of auxiliary alloy powders mixture in the percentage by weight of each component be: auxiliary alloy a0.1%-3.5%, auxiliary alloy b0.1%-3%, auxiliary alloy c0.1%-3%, all the other are master alloying; The addition of lubricant is the 0.05%-0.1% of main-auxiliary alloy powder total weight, and the addition of antioxidant is the 0-0.5% of main-auxiliary alloy powder total weight.
2. the preparation method of Nd-Fe-B permanent magnet according to claim 1, is characterized in that: step 6) in when utilizing airflow milling to grind in the powder mixed, the granularity after grinding is 2-8 μm; The concentration adding oxygen is 10-80ppm.
3. the preparation method of Nd-Fe-B permanent magnet according to claim 1, is characterized in that: step 7) in mixing time be 60-80min, alignment magnetic field is 1.5-2T.
4. the preparation method of Nd-Fe-B permanent magnet according to claim 1, it is characterized in that: step 8) in when the blank that die mould is good is sintered, the temperature of sintering is 1030-1050 DEG C, sintering time is 5.0-6.5 hour, double tempering heat treatment is specially: 860-920 DEG C insulation 3-4 hour after gas quench to room temperature, then be warming up to 460-540 DEG C insulation 3-4 hour after gas quench to room temperature.
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| CN108133799B (en) * | 2017-12-20 | 2020-01-17 | 江西理工大学 | High-performance nanocrystalline thermal deformation neodymium iron boron permanent magnet and preparation method thereof |
| CN108231312A (en) * | 2017-12-26 | 2018-06-29 | 钢铁研究总院 | A kind of permanent-magnet alloy prepared based on mischmetal and preparation method thereof |
| CN108389709A (en) * | 2017-12-27 | 2018-08-10 | 宁波招宝磁业有限公司 | The preparation method of low-carbon Sintered NdFeB magnet |
| JP7021577B2 (en) * | 2018-03-22 | 2022-02-17 | 日立金属株式会社 | Manufacturing method of RTB-based sintered magnet |
| CN112509775A (en) * | 2020-12-15 | 2021-03-16 | 烟台首钢磁性材料股份有限公司 | Neodymium-iron-boron magnet with low-amount heavy rare earth addition and preparation method thereof |
| CN115747611B (en) * | 2022-10-13 | 2023-10-20 | 包头金山磁材有限公司 | Auxiliary alloy cast sheet, high-remanence high-coercivity neodymium-iron-boron permanent magnet and preparation method |
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| CN101958171A (en) * | 2010-04-14 | 2011-01-26 | 无锡南理工科技发展有限公司 | Method for preparing corrosion-resistant sintered neodymium iron boron (NdFeB) magnet |
| CN103065787A (en) * | 2012-12-26 | 2013-04-24 | 宁波韵升股份有限公司 | Method for preparing sintered neodymium-iron-boron magnet |
| CN103122418A (en) * | 2013-02-05 | 2013-05-29 | 中铝广西有色金源稀土股份有限公司 | Method for preparing high-performance sintered neodymium-iron-boron by eliminating alpha-Fe |
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| CN103426624A (en) | 2013-12-04 |
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Effective date of registration: 20231226 Address after: 315000 66 Dinghai Road, chengguanhou Haitang Industrial Zone, Zhenhai District, Ningbo City, Zhejiang Province Patentee after: NINGBO ZHAOBAO MAGNET Co.,Ltd. Address before: 355 Datong Road, Zhenhai District, Ningbo City, Zhejiang Province, 315200 Patentee before: Lin Jianqiang |
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