CN100394518C - Method for preparing high coercive force sintering rare-earth-iron-p permanent magnetic material - Google Patents
Method for preparing high coercive force sintering rare-earth-iron-p permanent magnetic material Download PDFInfo
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- CN100394518C CN100394518C CNB2006100891247A CN200610089124A CN100394518C CN 100394518 C CN100394518 C CN 100394518C CN B2006100891247 A CNB2006100891247 A CN B2006100891247A CN 200610089124 A CN200610089124 A CN 200610089124A CN 100394518 C CN100394518 C CN 100394518C
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005245 sintering Methods 0.000 title claims abstract description 22
- 239000000696 magnetic material Substances 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 41
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 35
- 229910052771 Terbium Inorganic materials 0.000 claims abstract description 34
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 22
- 238000005516 engineering process Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 24
- 238000002360 preparation method Methods 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000748 compression moulding Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000011812 mixed powder Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 2
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 abstract description 14
- 229910052796 boron Inorganic materials 0.000 abstract description 4
- OTBIRTREDHPGJA-UHFFFAOYSA-N terbium Chemical compound [Tb].[Tb] OTBIRTREDHPGJA-UHFFFAOYSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 18
- 239000002105 nanoparticle Substances 0.000 description 8
- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 235000013495 cobalt Nutrition 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011858 nanopowder Substances 0.000 description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the method used to make rare earth-iron-boron permanent magnetic material with high coercive force which belongs to magnetic material field. The excellent magnetism of the NdFeB permanent magnetism will be obviously reduced while the working environment temperature rises. The invention includes the following steps: using rapid hardening slice technology to make NdFeB rapid hardening slice; smashing to powder with 3-5 micron; making terbium and dysprosium powder with 10-50nm; mixing them with 1-3% weight ratio; orientating at 2.5T magnetic field; processing secondary heat treatment after 2-4 hours sintering at 1050-1120 centigrade degree; the first order heat treatment is at 900-1000 degree centigrade for 1-3h; the secondary is at 550-700 degree centigrade for 1-3h. The invention has better coercive force and lower terbium and dysprosium content compared with the traditional NdFeB permanent magnetic material.
Description
Technical field
A kind of preparation has the method for the rare-earth-iron-boron permanent magnetic material of high-coercive force, belongs to technical field of magnetic materials.
Background technology
The sintered ndfeb permanent magnet typical case of the rare-earth-iron-boron permanent magnetic material (representative) is the best permanent magnetic material of present magnetic property, is widely used in numerous areas such as automobile, motor, instrument and medicine equipment, is with fastest developing speed a kind of in the magnetic material.But significant disadvantages of this class magnet ubiquity is promptly compared with permanent magnetic materials such as SmCo, aluminium nickel cobalts, has relatively poor temperature stability.In other words, the excellent magnetic of sintered ndfeb permanent magnet can significantly reduce along with the rising of operating ambient temperature (comprising multiple parameters such as remanent magnetism, coercive force and magnetic energy product).This shortcoming makes the sintered ndfeb permanent magnet material can't be applied in the field that working temperature is had relatively high expectations, and as starter motor of automobile or the like, thereby has limited the scope of application of this class material to a great extent.
In order to address this problem, people have carried out extensive studies work.A kind of effective solution is to add the metallic cobalt element of certain content in material, improves the Curie temperature of material, thereby improves its temperature characterisitic.But this method has difficulties in actual applications, and its reason is that the metallic element cobalt is a kind of strategic element, and price is very expensive.And a large amount of cheap as the NdFeB permanent magnetism of civil use material, if add more cobalt element, its manufacturing cost can significantly improve.This is the application of limiting material greatly undoubtedly.By comparison, a kind of effective and practical method is to add the heavy rare earth element terbium or the dysprosium of trace in the sintered ndfeb permanent magnet material at present.The interpolation of trace terbium and dysprosium can effectively improve the coercive force of material, and coercitive raising has remarkable effect for the temperature stability of improving magnet.Simultaneously,, only account for about the 2-4% of magnet gross mass because the addition of terbium and dysprosium is very little, little to the manufacturing cost influence of magnet.Therefore, thisly in the industrial production of current sintered ndfeb permanent magnet material, obtained adopting widely by improving the technology that the magnet coercive force improves its temperature stability.
Regrettably, the practical technique of above-mentioned this interpolation terbium and dysprosium also exists some problems.At first, when single terbium and dysprosium join in the sintered ndfeb permanent magnet material, can form the TbFeB or the DyFeB compound that are similar to NdFeB, though this compounds helps improving the coercive force of magnet, but can cause the remarkable decline of material remanent magnetism simultaneously, thereby cause the magnet magnetic energy product to descend.In other words, improve the magnet coercive force so that temperature stability is to be cost with the magnetic property that reduces magnet, this obviously is disadvantageous.Secondly, although the addition of terbium and dysprosium is little, the price of these heavy rare earth elements but is higher than light rare earth element such as Nd far away.Therefore,, then help reducing manufacturing cost more, thereby further enlarge the range of application of material if can further reduce the addition of terbium and dysprosium.And the difficulty that faces is, adopts present manufacturing technology, and the addition of terbium and dysprosium can't reduce, otherwise just can't play the effect that improves coercive force and improve temperature stability.
At present the addition manner that adopts is to add in foundry alloy, so terbium and dysprosium are evenly to be present in the magnet substantially.And,, form TbFeB or DyFeB compound if can on the boundary layer of principal phase NdFeB crystal grain, introduce one deck terbium and dysprosium according to the coercive force theory of sintered ndfeb permanent magnet material, just can obtain good effect.At first, can reduce TbFeB or the DyFeB ratio in the sintered ndfeb permanent magnet material like this, thereby reduce negative effect, simultaneously the purpose that can also realize improving coercive force and improve temperature characterisitic magnet remanent magnetism and magnetic energy product.Secondly, the addition of terbium and dysprosium can significantly reduce thus, thereby helps reducing the manufacturing cost of material.
At present, some relevant reports have been arranged.Prior art is carried out the coating of terbium and dysprosium respectively to magnet surface, utilize the method for diffusion to make terbium and dysprosium then respectively on the border of principal phase NdFeB crystal grain and form one deck TbFeB or the DyFeB compound, thereby realized raising material coercive force, improved its temperature stability, avoided declining to a great extent of magnet remanent magnetism and magnetic energy product simultaneously.But there is a restriction simultaneously in these two patented technologies, and promptly the high-coercive force magnet by the diffusion method preparation has considerable restraint on overall dimension, and the thickness of magnet can not be above 5 millimeters.In other words, utilize these two technology can only prepare the small size magnet.And the technology of relevant unconfined this class magnet of preparation size is not appeared in the newspapers at present.
Summary of the invention
At above-mentioned present Research, the present invention adopts the nano-powder particles adding technique preparation of rare earth element terbium and dysprosium to have the sintered ndfeb permanent magnet material of high-coercive force and excellent magnetic energy concurrently.Test result shows, compares with the sintered ndfeb permanent magnet material that the conventional art of identical nominal composition prepares, and adopts the magnet of the technology of the present invention preparation not only to have higher coercive force.In addition, compare with having quite coercitive sintered ndfeb permanent magnet material, the terbium of the required interpolation of magnet of employing the technology of the present invention preparation and the ratio (being the quality percentage composition) of dysprosium significantly reduce.
The purpose of this invention is to provide a kind of by adding the coercitive method of nano-powder particles raising sintered ndfeb permanent magnet material of rare earth element terbium and dysprosium.
A kind of method for preparing high-coercive force sintering rare-earth-iron-B permanent magnetic material provided by the invention is characterized in that, may further comprise the steps:
(1) adopts rapid hardening thin slice prepared NdFeB rapid hardening thin slice, pulverize preparation 3-5 micron NdFeB material powder with the quick-fried method of hydrogen with the alloy sheet fragmentation and by airflow milling afterwards;
(2) adopt physical gas phase deposition technology to prepare and collect the 10-50 nanometer powder of terbium or dysprosium;
(3) prepared terbium or dysprosium nano metal powder are added in the NdFeB powder for preparing in the step (1), adding proportion is the 1-3% of NdFeB powder weight, and powder is even;
(4) will in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder;
(5) pressed compact is inserted in the vacuum sintering furnace, at 1050-1120 ℃ of sintering 2-4 hour, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 900 ℃-1000 ℃, time 1-3hr; 550 ℃-700 ℃ of secondary heat treatment temperatures, time 1-3hr; Obtain sintered magnet.
NdFeB permanent magnetic material provided by the present invention is characterised in that: prepares the Sintered NdFeB magnet with the conventional art of identical component (containing terbium or dysprosium) and compares, have suitable remanent magnetism and the coercive force that significantly improves, and high slightly magnetic energy product; And have close coercitive conventional art and prepare the Sintered NdFeB magnet and compare, then the quality percentage composition of terbium metal or dysprosium is obviously on the low side.Technology of preparing of the present invention is adopted in the The above results explanation, can effectively improve terbium and dysprosium element interpolation efficient in the Sintered NdFeB magnet.Simultaneously, because the technology of the present invention is to add nanometer terbium and dysprosium particle before the material compacting sintering, therefore can prepare the unrestricted magnet of overall dimension.
Embodiment
Embodiment 1
Utilize the rapid hardening technology that composition is Nd
30.0Fe
67.5Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 3 microns of average grain diameters subsequently.(in detail referring to Chinese patent: 93115008.6, patent name: rare-earth-iron-boron permanent magnetic material and this preparation methods, the day for announcing: on January 10th, 1996, publication number: CN 1114779A, following examples are common a kind of this technology that is not limited to of prior art together).
(nanometer powder prepares the patent that detailed process can be applied in earlier stage referring to this seminar: 200510089080.3 Granted publication day: 2006.3.8 with terbium nanometer powders percentage by weight 1%, average grain diameter 10 nanometers afterwards, publication number: CN 1743103 patent names: rare earth nanometer particle and nano crystal material preparation method and equipment following examples thereof are common a kind of this technology that is not limited to of prior art together)
Add in the above-mentioned initial powder, utilize batch mixer that two kinds of powder are mixed uniformly.To in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder.Then pressed compact is inserted in the high vacuum sintering furnace, 1050 ℃ of sintering 4 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 950 ℃, time 2hr; 600 ℃ of secondary heat treatment temperatures, time 1hr.Promptly obtain sintered magnet.The every magnetic property index and the density of prepared magnet are listed in the table 1.
Comparative Examples 1
Utilize the rapid hardening technology that composition is Nd
29.7Tb
1.0Fe
66.8Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 3 microns of average grain diameters subsequently.Powder is orientated in the magnetic field of 2.5T and compression moulding.Then pressed compact is inserted in the high vacuum sintering furnace, 1050 ℃ of sintering 4 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 950 ℃, time 2hr; 600 ℃ of secondary heat treatment temperatures, time 1hr.Promptly obtain sintered magnet.The every magnetic property index and the density of prepared magnet are listed in the table 1.
The composition that it is pointed out that Comparative Examples 1 alloy is to design with proportioning according to the total composition after two kinds of powder among the embodiment 1, obtains to have the comparing result of two kinds of Sintered NdFeB magnets of identical component thus.
Table 1. adds the sintered magnet magnetic property and the density contrast of 1% terbium element in different ways
The terbium addition manner | Remanent magnetism (kGs) | Coercive force (kOe) | Magnetic energy product (MGOe) | Density (g/cm 3) |
Nano particle | 14.4 | 16.7 | 51 | 7.53 |
Traditional approach | 14.3 | 13.6 | 50 | 7.51 |
Above presentation of results is for the identical Sintered NdFeB magnet of composition, and the magnet that adopts the present invention to add the terbium preparation has better coercive force than the magnet that adopts traditional approach to add terbium, and remanent magnetism and magnetic energy product are also good slightly in addition.
Embodiment 2
Utilize the rapid hardening technology that composition is Nd
30.0Fe
67.5Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 4 microns of average grain diameters subsequently.Afterwards dysprosium nanometer powders percentage by weight 3%, average grain diameter 30 nanometers are added in the above-mentioned initial powder, utilize batch mixer that two kinds of powder are mixed uniformly.To in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder.Then pressed compact is inserted in the high vacuum sintering furnace, 1080 ℃ of sintering 3 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 900 ℃, time 3hr; 700 ℃ of secondary heat treatment temperatures, time 1hr.Promptly obtain sintered magnet.The every magnetic property index and the density of prepared magnet are listed in the table 2.
Comparative Examples 2
Utilize the rapid hardening technology that composition is Nd
27.5Dy
6.5Fe
63.5Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 4 microns of average grain diameters subsequently.Powder is orientated in the magnetic field of 2.5T and compression moulding.Then pressed compact is inserted in the high vacuum sintering furnace, 1080 ℃ of sintering 3 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 900 ℃, time 3hr; 700 ℃ of secondary heat treatment temperatures, time 1hr.Promptly obtain sintered magnet.。The every magnetic property index and the density of prepared magnet are listed in the table 2.
Table 2.3% dysprosium nano particle adds and 6.5% dysprosium tradition is added sintered magnet magnetic property and density
Terbium addition manner and amount | Remanent magnetism (kGs) | Coercive force (kOe) | Magnetic energy product (MGOe) | Density (g/cm 3) |
Nano particle 3% | 13.0 | 20.3 | 40 | 7.58 |
Traditional approach 6.5 % | 12.8 | 19.9 | 38 | 7.61 |
Above presentation of results adopts the inventive method and conventional method to prepare the close Sintered NdFeB magnet of coercive force, and there is very big-difference in the interpolation content of required dysprosium.Compare with conventional method, adopt nano particle adding method of the present invention obtaining the remarkable addition that reduces metal dysprosium of close coercitive while.In addition, owing to adopt the inventive method can reduce the addition of dysprosium, therefore the remanent magnetism of magnet and magnetic energy product also are higher than the magnet of conventional method preparation.
Embodiment 3
Utilize the rapid hardening technology that composition is Nd
30.0Fe
67.5Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 3 microns of average grain diameters subsequently.Afterwards dysprosium nanometer powders percentage by weight 1%, average grain diameter 20 nanometers are added in the above-mentioned initial powder, utilize batch mixer that two kinds of powder are mixed uniformly.To in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder.Then pressed compact is inserted in the high vacuum sintering furnace, 1100 ℃ of sintering 2 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 1000 ℃, time 1hr; 550 ℃ of secondary heat treatment temperatures, time 3hr.Promptly obtain sintered magnet.The every magnetic property index and the density of prepared magnet are listed in the table 3.
Table 3.1% dysprosium nano particle adds sintered magnet magnetic property and density
The terbium addition manner | Remanent magnetism (kGs) | Coercive force (kOe) | Magnetic energy product (MGOe) | Density (g/cm 3) |
Nano particle | 14.3 | 13.6 | 50 | 7.54 |
Embodiment 4
Utilize the rapid hardening technology that composition is Nd
30.0Fe
67.5Co
1.4B
1.1The alloy of (quality percentage composition) is prepared as thin slice, adopts hydrogen fragmentation-gas flow crushing process powder to be made the powder of 5 microns of average grain diameters subsequently.Afterwards dysprosium nanometer powders percentage by weight 3%, average grain diameter 50 nanometers are added in the above-mentioned initial powder, utilize batch mixer that two kinds of powder are mixed uniformly.To in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder.Then pressed compact is inserted in the high vacuum sintering furnace, 1120 ℃ of sintering 2 hours, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 900 ℃, time 2hr; 650 ℃ of secondary heat treatment temperatures, time 2hr.Promptly obtain sintered magnet.The every magnetic property index and the density of prepared magnet are listed in the table 4.
Table 4.2% dysprosium nano particle adds sintered magnet magnetic property and density
The terbium addition manner | Remanent magnetism (kGs) | Coercive force (kOe) | Magnetic energy product (MGOe) | Density (g/cm 3) |
Nano particle | 13.1 | 17.2 | 42 | 7.55 |
Claims (1)
1. a method for preparing high-coercive force sintering rare-earth-iron-B permanent magnetic material is characterized in that, may further comprise the steps:
1) adopts rapid hardening thin slice prepared NdFeB rapid hardening thin slice, pulverize preparation 3-5 micron NdFeB material powder with the quick-fried method of hydrogen with the alloy sheet fragmentation and by airflow milling afterwards;
2) adopt physical gas phase deposition technology to prepare and collect the 10-50 nanometer powder of terbium or dysprosium;
3) prepared terbium or dysprosium nano metal powder are added in the NdFeB powder for preparing in the step 1), adding proportion is the 1-3% of NdFeB powder weight, and powder is even;
4) will in the magnetic field of 2.5T, be orientated and compression moulding through even mixed powder;
5) pressed compact is inserted in the vacuum sintering furnace, at 1050-1120 ℃ of sintering 2-4 hour, carry out secondary heat treatment afterwards, wherein the one-level heat treatment temperature is 900 ℃-1000 ℃, time 1-3hr; 550 ℃-700 ℃ of secondary heat treatment temperatures, time 1-3hr; Obtain sintered magnet.
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Families Citing this family (12)
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CN101447268B (en) * | 2007-11-26 | 2012-08-22 | 比亚迪股份有限公司 | Neodymium iron boron permanent magnetic material and preparation method thereof |
CN101572146B (en) * | 2008-05-04 | 2012-01-25 | 比亚迪股份有限公司 | Nd-Fe-B permanent magnetic material and preparing method thereof |
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CN101847487B (en) * | 2010-06-30 | 2012-05-30 | 烟台正海磁性材料股份有限公司 | Gradient coercive-force neodymium-ferrum-boron magnet and production method thereof |
CN102294479B (en) * | 2011-08-30 | 2013-11-13 | 宁波韵升股份有限公司 | Method for preparing sintered neodymium iron boron device |
CN102655050B (en) * | 2012-05-04 | 2013-12-11 | 江苏大学 | Method for preparing high-performance high-temperature-resisting nanometer composite permanent magnet |
CN103779061B (en) * | 2012-10-17 | 2016-05-11 | 中磁科技股份有限公司 | High corrosion resistance Re-(Fe, TM)-B magnet and preparation method thereof |
CN103646777A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | Method for preparing crystal boundary nano-composite intensified neodymium iron boron magnet |
CN103956244B (en) * | 2014-05-14 | 2017-01-11 | 辽宁五寰工程技术有限公司 | Preparation method for high-coercivity sintered neodymium-iron-boron |
CN104091666A (en) * | 2014-08-04 | 2014-10-08 | 梁家新 | Method for preparing neodymium-iron-boron permanent magnet material through nanometer modification |
CN109065314B (en) * | 2018-09-07 | 2020-10-27 | 京磁材料科技股份有限公司 | Method for preparing high-coercivity magnet |
CN114429858B (en) * | 2022-01-13 | 2024-07-09 | 宁波金轮磁材技术有限公司 | Sintered NdFeB magnetic steel and preparation method thereof |
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JP2005281795A (en) * | 2004-03-30 | 2005-10-13 | Tdk Corp | R-T-B BASED SINTERED MAGNET ALLOY CONTAINING Dy AND Tb AND ITS PRODUCTION METHOD |
CN1743103A (en) * | 2005-08-05 | 2006-03-08 | 北京工业大学 | Rear-earth nano granule and nano crystal material preparing method and apparatus |
-
2006
- 2006-08-04 CN CNB2006100891247A patent/CN100394518C/en active Active
Patent Citations (3)
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---|---|---|---|---|
CN1114779A (en) * | 1993-07-06 | 1996-01-10 | 住友特殊金属株式会社 | R-Fe-B permanent magnet materials and process of producing the same |
JP2005281795A (en) * | 2004-03-30 | 2005-10-13 | Tdk Corp | R-T-B BASED SINTERED MAGNET ALLOY CONTAINING Dy AND Tb AND ITS PRODUCTION METHOD |
CN1743103A (en) * | 2005-08-05 | 2006-03-08 | 北京工业大学 | Rear-earth nano granule and nano crystal material preparing method and apparatus |
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