CN104134529A - Anisotropic nanocrystal neodymium iron boron magnet, and preparation method and application of magnet - Google Patents
Anisotropic nanocrystal neodymium iron boron magnet, and preparation method and application of magnet Download PDFInfo
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Abstract
The invention belongs to the field of powder metallurgy and magnet preparation, and discloses an anisotropic nanocrystal neodymium iron boron magnet, and a preparation method and an application of the magnet. The preparation method comprises the following steps of allowing neodymium-enriched neodymium iron boron powder to be densified by high-speed pressing, obtaining a thermal deformation precursor, performing thermal deformation on the thermal deformation precursor, and obtaining the anisotropic nanocrystal neodymium iron boron magnet. The preparation method is high in high-speed pressing forming efficiency, allows the powder to be densified instantly, and can improve the production efficiency of a product. The anisotropic nanocrystal neodymium iron boron magnet is excellent in density and magnetic performance, and can be applied to the fields of consumer electronics, acoustics, engines, wind power, traffic, computers, high-performance automobile motors and the like.
Description
Technical field
The invention belongs to powder metallurgy and magnet preparation field, be specifically related to a kind of anisotropy nano-crystal neodymium iron boron magnetic body and preparation method thereof and application.
Background technology
With neodymium iron boron magnetic body (Nd
2fe
14b) for the third generation rare earth permanent-magnetic material of representative is the highest, most widely used, the with the fastest developing speed permanent magnetic material of magnetic property.Because neodymium iron boron magnetic body has high saturation and magnetic intensity, the high advantage such as anisotropic field and high energy product, all have a wide range of applications in fields such as audio device, automotive field, oil field paraffin removal, medical device, computers.The demand cumulative year after year of the whole world to rare-earth Nd-Fe-B series permanent magnetic material, with the speed increment of 1,000,000 tons, development potentiality is large every year on average, has good Market Situation.Although China is rare earth storage capacity big country, China is mainly production low and middle-end magnet, and high-end magnet will be to imports such as the U.S. and Japan.During 10 years of nineteen ninety-five to 2005 year, China exports rare earth mineral resources in a large number, causes the loss on foreign exchange of 10,000,000,000 dollars to China.The technology of preparing that improves China's high-performance magnet not only has great economic worth, contributes to especially to make China to become rare earth power.Nd
2fe
14b compound has very strong unit anisotropy, with Nd
2fe
14b is in the compound permanent magnetic material of matrix, works as Nd
2fe
14when the crystal grain c-axis disorientation of B, crystal is isotropic, its J
r=0.5J
s, (BH)
max=0.5 (J
s/ 2)
2; Work as Nd
2fe
14when the crystal grain c-axis rule orientating of B, crystal is anisotropic, its J
r≈ J
s, (BH)
max=0.25J
s 2.Obviously, the magnetic property of anisotropic permanent magnet is more much higher than isotropic permanent magnet.
High velocity compacted technology is Sweden
the Paul Skoglund of AB company proposes, the new technology that is shaped safely and efficiently of releasing in June calendar year 2001.The operating process of high velocity compacted technology is very similar with conventional unidirectional compacting: be, in 2～30m/s situation, powder is carried out to high energy hammering in speed, strong shock wave compacting makes powdered metallurgical material reach high density.Compared with tradition compacting, high velocity compacted technology has the advantages such as the low and moulding of high-compactness, cost is fast, and high velocity compacted powder keeps original grain size and structure substantially at normal temperatures simultaneously.Therefore high velocity compacted technology has been subject to paying close attention to widely, has successfully been applied in the preparation of the materials such as iron powder, titanium valve, 316L stainless steel powder, copper powder and polymer, is also used in and prepares soft magnetic material and HRRD Magnaglo.
The preparation method of anisotropic neodymium iron boron magnetic body mainly contains powder metallurgic method and thermal deformation method, and anisotropy magnet prepared by powder metallurgy system is owing to inevitably can containing cavity and non-magnetic phase, thereby can make the thermal stability of magnet.Corrosion resistance and fracture toughness decline.And thermal deformation is first by Magnaglo densification, then the magnet after densification is out of shape by methods such as jumping-up, extruding and rollings, make the anisotropy magnet after thermal deformation have the evenly tiny feature such as grain structure structure and density, its thermal stability and fracture toughness are higher than traditional sintered magnet.Thermal deformation is in anisotropic neodymium iron boron magnetic body, and the existence of rich neodymium phase plays vital effect, if there is no rich neodymium phase in magnet, is difficult to even may not be out of shape.
Summary of the invention
For the shortcoming that overcomes prior art is with not enough, primary and foremost purpose of the present invention is to provide that a kind of apparatus and process is simple, productive rate is high, the preparation method of the anisotropy nano-crystal neodymium iron boron magnetic body of with low cost, energy savings;
The anisotropy nano-crystal neodymium iron boron magnetic body that provides above-mentioned preparation method to obtain is provided;
A further object of the present invention is to provide the application of above-mentioned anisotropy nano-crystal neodymium iron boron magnetic body.
Object of the present invention is achieved through the following technical solutions:
A kind of preparation method of anisotropy nano-crystal neodymium iron boron magnetic body, comprise the steps: to make the neodymium iron boron powder densification moulding of rich neodymium obtain thermal deformation presoma by high velocity compacted, then described thermal deformation presoma is carried out to thermal deformation, obtain described anisotropy nano-crystal neodymium iron boron magnetic body.
Preferably, in the neodymium iron boron powder of described rich neodymium, the mass fraction of neodymium is 29.2～33wt%;
Preferred, in the neodymium iron boron powder of described rich neodymium, the content of main element is: Nd:29.2～31wt%, FeCoAl:67.8～70wt%, B:1 ± 0.2wt%;
Preferably, the preparation method's of above-mentioned anisotropy nano-crystal neodymium iron boron magnetic body concrete steps are:
(1) smear lubricant at the mold cavity surface of compacting tool set and the surface of upper and lower tringle;
(2) the neodymium iron boron powder of described rich neodymium is filled in the die cavity of compacting tool set, carries out high velocity compacted, the demoulding obtains compacting sample, is thermal deformation presoma;
(3) described thermal deformation presoma is placed in to hot pressing furnace and carries out thermal deformation, cooling after thermal deformation completes, take out finished product, be described anisotropy nano-crystal neodymium iron boron magnetic body.
In above-mentioned preparation method's concrete steps:
Preferably, the internal diameter of described compacting tool set is 12～16mm;
Preferably, the alcohol suspension that described lubricating oil is zinc stearate, alcohol suspension or the vaseline of calcium stearate;
Preferably, carrying out precompressed 2min before high velocity compacted;
Preferably, described high velocity compacted adopts single-impact compressing or repeatedly impact compressing;
Preferably, the quality energy density of controlling the neodymium iron boron powder of rich neodymium in the die cavity of compacting tool set in high velocity compacted is greater than 160J/g; Preferred, the quality energy density of controlling the neodymium iron boron powder of rich neodymium in the die cavity of compacting tool set in high velocity compacted is 160～300J/g;
Quality energy density, the impact energy that rolled-up stock of unit mass is subject in pressing process, can calculate by following formula: I=E/m, in formula, I is quality energy density, unit is J/g; E is the impact energy of compacting, and unit is burnt (J); M is the loading of the neodymium iron boron powder of described rich neodymium, and unit is gram (g).
Preferably, described thermal deformation presoma carries out before thermal deformation, first carries out jacket with sheath material;
Internal diameter size, height and the thermal deformation presoma of sheath material are in the same size, or sheath material internal diameter is than the large 2～3mm of thermal deformation presoma external diameter, highly low 2～3mm;
Preferably, described sheath material is H65 brass, fine copper or iron;
Preferably, the temperature of described thermal deformation is 680～900 DEG C, and deflection is 15～80%;
Preferred, the deflection of described thermal deformation is 15～40%.
A kind of anisotropy nano-crystal neodymium iron boron magnetic body obtaining according to above-mentioned preparation method.
Above-mentioned anisotropy nano-crystal neodymium iron boron magnetic body can be applicable at consumer electronics, sound equipment, engine, wind-powered electricity generation and field of traffic, especially can be applicable to computer and high-performing car technical field of motors.
The present invention has following advantage and effect with respect to prior art:
(1) in traditional thermal deformation technique, conventionally make powder densification formed blocks by methods such as conventional sintering, electric spark plasma agglomeration or hot pressing, then carry out thermal deformation; And preparation method of the present invention adopts high velocity compacted moulding under normal temperature, save a large amount of energy, in thermal deformation, nanocrystal can not be grown up substantially, can well keep the institutional framework of starting powder.
(2) preparation method's high velocity compacted shaping efficiency of the present invention is high, and moment makes powder densification, can improve production efficiency.
(3) preparation method of the present invention adopts high velocity compacted moulding, the decline of the magnetic property of having avoided answering grain growth in sinter molding method and cause, general sintered magnet is all that grain size is all micron order, and magnet prepared by high velocity compacted still can keep the nanocrystalline grain size size of original powder.
(4) high velocity compacted that preparation method of the present invention adopts is shaped to clean moulding, does not add any binding agent, has better magnetic property than anisotropic Agglutinate neodymium-iron-boron magnet.
(5) preparation method of the present invention, except adopting the neodymium iron boron powder of rich neodymium to prepare anisotropy nano-crystal neodymium iron boron magnetic body, also can adopt conventional neodymium iron boron powder and poor rare-earth Nd-Fe-B powder to be prepared.
(6) preparation method's technique of the present invention is simple, with low cost, is applicable to producing in enormous quantities.
(7) anisotropy nano-crystal neodymium iron boron magnetic body magnet density of the present invention and magnetic property excellence.The magnet maximum magnetic energy product (BH) obtaining from high velocity compacted
max=65 (kJ/m
3), maximum magnetic energy product after 40% deflection (BH)
max=120 (kJ/m
3) nearly double, heighten greatly the magnetic energy product of magnet, still keep higher coercive force H simultaneously
ci=784 (kA/m).
Brief description of the drawings
Fig. 1 is the installation diagram of the compacting tool set of internal diameter Ф=12mm in embodiment 2.
Fig. 2 is the correlation figure of quality energy density I to high velocity compacted magnet density.
Fig. 3 is the XRD figure of cylindrical magnet and 40% heat distortion amount magnet after high velocity compacted.
Fig. 4 is high velocity compacted magnet and 15% deflection magnet magnetic hysteresis loop figure.
Fig. 5 is high velocity compacted magnet and 40% deflection magnet magnetic hysteresis loop figure.
Fig. 6 is embodiment 2 12mm cylindrical magnet vertical plane SEM figure after high velocity compacted.
Fig. 7 is the SEM figure of embodiment 2 12mm cylindrical magnet horizontal plane after high velocity compacted.
Fig. 8 is the SEM figure that embodiment 2 gained magnet after thermal deformation 40% deflection is parallel to pressure direction.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
The present invention adopts high velocity compacted machine, and starting powder is rich neodymium neodymium iron boron powder, and hot pressing furnace is HP-12 × 12 × 12, U.S. Centorr Vacuum Industries.
Embodiment 1
A kind of anisotropy nano-crystal neodymium iron boron magnetic body, its preparation method is as follows:
(1) prepare neodymium iron boron flakelike powder, essential element mass fraction is respectively 29.2wt%Nd, 69.8wt% (FeCoAl), 1wt%B; Select the compacting tool set of internal diameter Ф=16mm, coat equably zinc stearate alcoholic solution at mold cavity and upper and lower tringle, until after vaporized alcohol, ready neodymium iron boron flakelike powder is put into mold cavity carefully, and shake mould powder is uniformly distributed as far as possible, filling amount m=12.21g;
(2) according to the impact energy E of quality energy Auto-regulating System of Density of Heavy Medium high velocity compacted machine, record jump bit and impact the above spot speed of tringle, determine impact energy size.Adopt high velocity compacted twice, select for the first time impact energy E=320J, E=386J carries out high velocity compacted for the second time; Adopt one time high velocity compacted, adopt successively 1500J, 1581J, 1768J, 1987J and five kinds of impact energys of 2113J to carry out then demoulding taking-up compacting sample of high velocity compacted to the mould of step (1);
(3) be wrapped in the H65 brass of internal diameter 16mm, wall thickness 1mm, height 9.7mm the compacting sample that density is the highest, write hot pressing furnace thermal deformation program.Thermal deformation conditions: 750 DEG C of insulation 10min, rate of deformation is 0.001s
-1, the cooling rear taking-up thermal deformation finished product of hot pressing furnace, now can observe specimen height and be reduced to 8mm by the time, occurs compared with small deformation along pressure method, and deflection is about 15%; Gained thermal deformation finished product is described anisotropy nano-crystal neodymium iron boron magnetic body.
Embodiment 2
A kind of anisotropy nano-crystal neodymium iron boron magnetic body, its preparation method is as follows:
(1) prepare neodymium iron boron flakelike powder, essential element mass fraction is respectively 29.2wt%Nd, 69.8wt% (FeCoAl), 1wt%B; Select the compacting tool set of internal diameter Ф=12mm, coat equably zinc stearate alcoholic solution at mold cavity and upper and lower tringle, until after vaporized alcohol, ready neodymium iron boron flakelike powder is put into mold cavity carefully, and shake mould powder is uniformly distributed as far as possible, filling amount m=6.91g; The installation diagram of the compacting tool set of internal diameter Ф=12mm as shown in Figure 1;
(2) according to the impact energy E of quality energy Auto-regulating System of Density of Heavy Medium high velocity compacted machine, record jump bit and impact the above spot speed of tringle, determine impact energy size.Adopt successively 1227J, 1500J, 1581J, 1768J and five kinds of impact energys of 1988J to carry out high velocity compacted one time to the mould of step (1), then compacting sample is taken out in the demoulding;
(3) be wrapped in the highest sample of compacting density with the fine copper of internal diameter 14mm, wall thickness 1mm, height 6mm, write hot pressing furnace thermal deformation program.Thermal deformation conditions: 750 DEG C of insulation 8min, the cooling rear taking-up thermal deformation finished product of hot pressing furnace, now can observe specimen height and be reduced to 5mm by the time, along pressure method, obviously distortion occurs, and deflection is about 40%; Gained thermal deformation finished product is described anisotropy nano-crystal neodymium iron boron magnetic body.
Embodiment 3
A kind of anisotropy nano-crystal neodymium iron boron magnetic body, its preparation method is as follows:
(1) prepare neodymium iron boron flakelike powder, essential element mass fraction is respectively 30.2wt%Nd, 68.8wt% (FeCoAl), 1wt%B; Select the compacting tool set of internal diameter Ф=16mm, coat equably zinc stearate alcoholic solution at mold cavity and upper and lower tringle, until after vaporized alcohol, ready neodymium iron boron flakelike powder is put into mold cavity carefully, and shake mould powder is uniformly distributed as far as possible, filling amount m=7.69g;
(2) according to the impact energy E of quality energy Auto-regulating System of Density of Heavy Medium high velocity compacted machine, record jump bit and impact the above spot speed of tringle, determine impact energy size.Adopt successively tri-kinds of impact energys of 1191J, 1309J and 1605J to carry out high velocity compacted one time to the mould of step (1), then compacting sample is taken out in the demoulding;
(3) do not adopt jacket, directly in hot pressing furnace to the highest compacting sample of density through row thermal deformation, write hot pressing furnace thermal deformation program.Thermal deformation conditions: 900 DEG C of insulation 5min, the cooling rear taking-up thermal deformation finished product of hot pressing furnace by the time, now can observe specimen height and reduce 1mm, occurs compared with small deformation along pressure method, and deflection is about 18%; Gained thermal deformation finished product is described anisotropy nano-crystal neodymium iron boron magnetic body.
Performance test:
Performance and the structure of the anisotropy nano-crystal neodymium iron boron magnetic body of preparing for above-described embodiment, characterize and analyze by ESEM, X-ray diffraction, comprehensive physical property measuring system etc., is described further below in conjunction with accompanying drawing.
Fig. 2 is the correlation figure of quality energy density I to high velocity compacted magnet density.In high velocity compacted process, filling component and impact energy is all to affect rolled-up stock density important parameter, therefore introduces one and can embody impact energy and can embody again the physical quantity-quality energy density of dress component to rolled-up stock Effects of Density.Work as I<160J/g, density increases along with the increase of quality energy density I, because the mutual extrusion packing of powder space; Work as 160<I<220J/g, density is constant along with the increase of quality energy density I, because powder is in compacting equilibrium stage; Work as 220J/g<I, density increases again along with the increase of quality energy density I, because powder generation plastic deformation, density increases.
The XRD of cylindrical magnet and 40% heat distortion amount magnet figure after Fig. 3 high velocity compacted.Substantially all peaks are all Nd
2fe
14the peak of B phase, in the time of 40% deflection, the crystal face showed increased of rotating to c-axis direction, (004), the peak intensity such as (105), (314), (006), (216) and (008) obviously strengthens, embody after thermal deformation, neodymium iron boron magnetic body has anisotropy.
Fig. 4 high velocity compacted magnet and 15% deflection magnet magnetic hysteresis loop figure.The magnetic property coercive force H of magnet after high velocity compacted
ci=1101 (kA/m), remanent magnetism J
r=0.64 (T), maximum magnetic energy product (BH)
max=65 (kJ/m
3), saturation magnetization J
s, 6T=1.13 (T); The magnetic property coercive force H of 15% heat distortion amount magnet
ci=965 (kA/m), remanent magnetism J
r=0.78 (T), maximum magnetic energy product (BH)
max=88 (kJ/m
3), saturation magnetization J
s, 6T=1.34 (T).From figure, can draw the increase along with deflection, the coercive force H of magnet
cireduce, remanent magnetism and saturation magnetization all increase, and magnet starts to have anisotropy.
Fig. 5 high velocity compacted magnet and 40% deflection magnet magnetic hysteresis loop figure.The magnetic property coercive force H of magnet after high velocity compacted
ci=1101 (kA/m), remanent magnetism J
r=0.64 (T), maximum magnetic energy product (BH)
max=65 (kJ/m
3), saturation magnetization J
s, 6T=1.13 (T); 40% heat distortion amount magnet magnetic property coercive force H
ci=784 (kA/m), remanent magnetism J
r=0.95 (T), maximum magnetic energy product (BH)
max=120 (kJ/m
3), saturation magnetization J
s, 6T=1.47 (T).The magnet maximum magnetic energy product (BH) obtaining from high velocity compacted
max=65 (kJ/m
3), maximum magnetic energy product after 40% deflection (BH)
max=120 (kJ/m
3) nearly double, heighten greatly the magnetic energy product of magnet, still keep higher coercive force H simultaneously
ci=784 (kA/m).This is that powder grain can not be grown up substantially, keeps original tissue and structure because when high velocity compacted.
The magnetic property table of table 1 starting powder, high velocity compacted magnet, 15% deflection and 40% deflection magnet.In thermal deformation process, along with the increase of deflection, the remanent magnetism of magnet and saturation magnetization increase, in the time that deflection reaches 40%, and remanent magnetism J
r=0.64 (T) is increased to 0.95 (T), has obvious anisotropy.
The each sample magnetic parameter of table 1
Indicate: 1. the coercive force that this numerical value is the neodymium iron boron powder that adopts in embodiment 1 and 2, different powder particle sizes is slightly different.
Fig. 6 is embodiment 2 12mm cylindrical magnet vertical plane SEM figure after high velocity compacted.Powder is closely heaped in the form of sheets layer by layer, and the direction of heap is almost parallel with pressure direction.
Fig. 7 is the SEM figure of embodiment 2 12mm cylindrical magnet horizontal plane after high velocity compacted.Powder is closely connected with powder edge, but still has cavity.
Fig. 8 is the SEM figure that embodiment 2 gained magnet after thermal deformation 40% deflection is parallel to pressure direction.In the time of thermal deformation, powder grain vertical with pressure direction growth, c-axis tends to parallel pressure direction.From microstructure explanation thermal deformation, magnet has anisotropy, and anisotropy nano-crystal neodymium iron boron magnetic body can be successfully prepared in high velocity compacted and thermal deformation.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. the preparation method of an anisotropy nano-crystal neodymium iron boron magnetic body, it is characterized in that, comprise the steps: to make the neodymium iron boron powder densification moulding of rich neodymium obtain thermal deformation presoma by high velocity compacted, then described thermal deformation presoma is carried out to thermal deformation, obtain described anisotropy nano-crystal neodymium iron boron magnetic body.
2. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 1, is characterized in that: in the neodymium iron boron powder of described rich neodymium, the mass fraction of neodymium is 29.2～33wt%.
3. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 2, it is characterized in that: in the neodymium iron boron powder of described rich neodymium, the content of main element is: Nd:29.2～31wt%, FeCoAl:67.8～70wt%, B:1 ± 0.2wt%.
4. according to the preparation method of the anisotropy nano-crystal neodymium iron boron magnetic body described in claim 1～3 any one, it is characterized in that: the preparation method's of described anisotropy nano-crystal neodymium iron boron magnetic body concrete steps are:
(1) smear lubricant at the mold cavity surface of compacting tool set and the surface of upper and lower tringle;
(2) the neodymium iron boron powder of described rich neodymium is filled in the die cavity of compacting tool set, carries out high velocity compacted, the demoulding obtains compacting sample, is thermal deformation presoma;
(3) described thermal deformation presoma is placed in to hot pressing furnace and carries out thermal deformation, cooling after thermal deformation completes, take out finished product, be described anisotropy nano-crystal neodymium iron boron magnetic body.
5. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 4, is characterized in that: the internal diameter of described compacting tool set is 12～16mm; Described lubricating oil is the alcohol suspension of zinc stearate, alcohol suspension or the vaseline of calcium stearate; Carrying out precompressed 2min before high velocity compacted; Described high velocity compacted employing single-impact is compressing or repeatedly impact compressing; Described thermal deformation presoma carries out before thermal deformation, first carries out jacket with sheath material.
6. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 5, is characterized in that: described sheath material is H65 brass, fine copper or iron.
7. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 4, is characterized in that: the quality energy density of controlling the neodymium iron boron powder of rich neodymium in the die cavity of compacting tool set in high velocity compacted is greater than 160J/g; The temperature of described thermal deformation is 680～900 DEG C, and deflection is 15～80%.
8. the preparation method of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 7, is characterized in that: the quality energy density of controlling the neodymium iron boron powder of rich neodymium in the die cavity of compacting tool set in high velocity compacted is 160～300J/g; The deflection of described thermal deformation is 15～40%.
9. the anisotropy nano-crystal neodymium iron boron magnetic body obtaining according to the preparation method described in claim 1～8 any one.
10. the application of anisotropy nano-crystal neodymium iron boron magnetic body according to claim 9 in consumer electronics, sound equipment, engine, wind-powered electricity generation, field of traffic, computer and high-performing car motor.
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| CN106887294A (en) * | 2017-03-10 | 2017-06-23 | 钢铁研究总院 | Many seamless permanent-magnet rare-earth rings of Hard Magnetic principal phase radial orientation and cold-forming process |
| CN109014187A (en) * | 2018-09-18 | 2018-12-18 | 安徽宁磁电子科技有限公司 | Magnetic ball blank forms whole set of die and its production method |
| CN111403166A (en) * | 2020-04-17 | 2020-07-10 | 成都银河磁体股份有限公司 | Preparation method of hot-pressed magnet and product thereof |
| CN115430836A (en) * | 2022-08-24 | 2022-12-06 | 广东省科学院资源利用与稀土开发研究所 | Preparation method and device of high-abundance rare earth cerium-based anisotropic nanocrystalline magnet |
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| 黄华勇: "基于快淬纳米晶REFeB粉末的稀土永磁性能及致密化工艺研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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| CN106887294A (en) * | 2017-03-10 | 2017-06-23 | 钢铁研究总院 | Many seamless permanent-magnet rare-earth rings of Hard Magnetic principal phase radial orientation and cold-forming process |
| CN106887294B (en) * | 2017-03-10 | 2020-05-22 | 钢铁研究总院 | Multi-hard magnetic main phase radial orientation seamless rare earth permanent magnet ring and low-temperature forming method |
| CN109014187A (en) * | 2018-09-18 | 2018-12-18 | 安徽宁磁电子科技有限公司 | Magnetic ball blank forms whole set of die and its production method |
| CN111403166A (en) * | 2020-04-17 | 2020-07-10 | 成都银河磁体股份有限公司 | Preparation method of hot-pressed magnet and product thereof |
| CN111403166B (en) * | 2020-04-17 | 2022-08-05 | 成都银河磁体股份有限公司 | Preparation method of hot-pressed magnet and product thereof |
| CN115430836A (en) * | 2022-08-24 | 2022-12-06 | 广东省科学院资源利用与稀土开发研究所 | Preparation method and device of high-abundance rare earth cerium-based anisotropic nanocrystalline magnet |
| CN115430836B (en) * | 2022-08-24 | 2023-11-17 | 广东省科学院资源利用与稀土开发研究所 | Preparation method and device of high-abundance rare earth cerium-based anisotropic nanocrystalline magnet |
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