CN105810380A - High-temperature resistant and high-magnetism rear earth permanent magnetic material and preparation method thereof - Google Patents
High-temperature resistant and high-magnetism rear earth permanent magnetic material and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
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Abstract
The invention discloses a high-temperature resistant and high-magnetism rear earth permanent magnetic material and a preparation method thereof. The basic expression of the high-temperature resistant and high-magnetism rear earth permanent magnetic material is R<x>Fe<100-x-y-z>B<y>M<z>, wherein R is alloy composed of light rare earth elements Pr and Nd according to a proportion of 1:3, Fe is an iron element, B is a boron element, M is a molybdenum element, an x value ranges from 14.2 to 30.5, a y value ranges from 1.2 to 4.8, and a z value ranges from 0.1 to 2.0. The preparation method comprises the following steps of taking Pr-Nd alloy, Fe-B alloy and metal Mo as raw materials; carrying out vacuum melting in a vacuum melting furnace under the protection of an inertia gas to obtain alloy ingot with uniform constituents; and carrying out rapid quenching and rapid hardening processes on the above alloy ingot to obtain a metal thin strip, smashing the metal thin strip, allowing the metal thin strip to pass through a sieving mesh, and carrying out annealing processing. The rear earth permanent magnetic material disclosed by the invention has the advantages of fine grain size, uniform microstructure, high magnetic energy product, high residual magnetism, high working temperature and high thermal stability and is easy to magnetize.
Description
Technical field
The present invention relates to rare earth permanent-magnetic material, concretely relate to the resistance to height of one made with lanthanide series rare-earth elements praseodymium neodymium (PrNd)
The high performance rare earth permanent-magnetic material of warm type.
Prior art
Rare earth permanent-magnetic material as new material industry important component part, machinery, electronics, communication, medical treatment, Aero-Space,
The field such as new-energy automobile, high-speed railway is applied widely, and it experienced by the first generation (RECo5), the second filial generation (RE2TM17) and
The third generation (NdFeB) rare earth permanent-magnetic material etc..
At present, neodymium iron boron (NdFeB) permanent magnet material gets most of the attention in new material industry, is divided into sintered NdFeB and Agglutinate neodymium-iron-boron,
Agglutinate neodymium-iron-boron is little with its volume, easy-formation and cost performance advantages of higher are widely used in computer, automobile, military project, medical treatment set
Execute, the field such as office equipment, household electrical appliance.Along with science and technology fast development, to magnetic device, the miniaturization of electronic product,
Slimming and thermal stability requirement are more and more higher, this just require permanent magnet material possess high magnetic, easily magnetize, resistant to elevated temperatures feature.
As the NdFeB permanent magnet alloy powder of bonded permanent magnet main raw material(s), its composition patent mainly has the U.S. (MG) company to invent
US4,802,931 and US4,851,058, relate generally to neodymium iron boron and include that neodymium is at interior rare earth element percentage composition, the percentage of ferrum
Content and the percent ranges of boron.
The feature of NdFeB permanent magnet alloy powder is: magnetic property is good, and mechanical property is good, but Curie temperature Tc is low, and temperature stability is poor,
Therefore chemical stability is not good enough limits its range of application, is the performance improving magnetic powder and magnet subsequently, expands its range of application,
Some modifying elements are added in many researchs and invention on the basis of Nd-Fe-B.The Chinese patent of Publication No. CN 1986856A is public
Having opened " a kind of high stability and high magnetism quenched R-Fe-B base permanent magnetic alloy powder ", in that patent, describing its basic representation is
RxFe100-x-y-z-vMzNvBy, R be one or more LREEs (Nd, Pr, La), Fe be ferrum element, M is Nb, Zr,
One or more in Ti, N is Co element, and B is boron element, each elemental constituent x, and y, z, v ratio of components meets:
7.0≤x≤12.8,5.0≤y≤9.0,0.15≤z≤4.0,0≤v≤6.5, make material by adding the transition elements such as Nb
Temperature stability and oxidation resistance significantly improve.The HCJ of this magnetic powder also significantly improves.
Summary of the invention
It is an object of the invention to provide a kind of high temperature resistant type high magnetic rare earth permanent-magnetic material and preparation method thereof, make rare earth permanent-magnetic material
Obtain crystallite dimension refinement, micro structure is uniform, magnetic energy product is high, remanent magnetism is high, easily magnetize and operating temperature is high, Heat stability is good
Performance.
The present invention is achieved through the following technical solutions above-mentioned purpose.A kind of high temperature resistant type high magnetic rare earth permanent-magnetic material, its base table
Reaching formula is: RxFe100-x-y-zByMz, wherein, the alloy that R is made up of according to the ratio of 1:3 LREE Pr, Nd, Fe is
Ferrum element, B is boron element, and M is molybdenum element；X span be 14.2-30.5, y span be 1.2-4.8, z value
Scope is 0.1-2.0.
Preferably, described x span be 14.2-23, y span be 1.2-3.6, z span be 0.1-1.5.
Preferably, described x span be 15-20.5, y span be 1.8-3.1, z span be 0.3-1.0.
A kind of preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material, with Pr-Nd alloy, Fe-B alloy and metal Mo be
Raw material, under the protection of noble gas, carries out vacuum metling in vacuum melting furnace, obtains the uniform alloy pig of composition, then will
The above-mentioned alloy pig obtained carries out fast quenching strip casting process, crushed screen cloth, and make annealing treatment after obtaining metal sheet band.
Preferably, in described Pr-Nd alloy, Pr content is 25%, and atomic percent is 22%.
Preferably, in described Fe-B alloy, B content is 19%, and the atomic percent of B is 3%.
Preferably, the atomic percent of described Mo is 0.2%.
Preferably, described fast quenching strip casting controls wheel speed is 20-24m/s.
Preferably, described annealing temperature is 500-650 DEG C, and annealing time is 25-40min.
In the present invention, R uses Pr element to instead of part Nd element.
The present invention, on the basis of Nd-Fe-B alloy, carries out a certain proportion of replacement and adds other element alloying element.
The interpolation of Mo element: add Mo element and on the one hand can improve the micro structure of permanent-magnet alloy, it is suppressed that Nd-Fe-B crystal grain
Forming core grow up, refined crystal grain, strengthened soft magnetism phase and the exchange-coupling interaction of Hard Magnetic phase, be on the other hand that to strengthen its temperature steady
Qualitative, improve operating temperature, and then improve the combination property of product.
Pr forms Pr after replacing part Nd2Fe14B, due to Pr2Fe14The each of B compares Nd to different field2Fe14B's is each high to different field, institute
With, replace part Nd with Pr, the anisotropy of hard magnetic phase can be improved so that the remanent magnetism of product, magnetic energy product obtain bigger
Raising.
The present invention becomes to be grouped into by providing specific, and by fast quenching strip casting, and annealing process is prepared a kind of high temperature resistant
Type high magnetic rare earth permanent-magnetic material, wherein annealing process is preferably the temperature range of 500 DEG C-650 DEG C, and annealing time preferably exists
25-40min。
Rare earth permanent-magnetic material of the present invention shows the HCJ (Hci) of about 750-797kA/m, and the height of 890-920mT remains
Magnetic (Br) and 128Kj/m3Above maximum magnetic energy product (BHmax).
Other character of the rare earth permanent-magnetic material of the present invention includes having certain crystallite dimension, between 20-50nm.Owing to possessing
Such micro structure so that it is the magnetic property that can show excellence is possibly realized.
What prior art obtained is high energy product, high-coercive force shaped material, and the present invention is by replacing part Nd unit with Pr element
Element also adds Mo element, and obtain is then high energy product, high remanent magnetism, high temperature resistant type material.
The product using manufacture of the present invention has the advantage that
(1) having refined crystal grain, crystallite dimension is 20-50nm, and its composition is uniform, and tissue distribution is uniform, and concordance is good；
(2) there is high Curie temperature, reach 370 DEG C, use temperature to be up to 130 DEG C-160 DEG C；
(3) reducing the irreversible magnetic flux of magnetic powder, process 2 hours 160 DEG C of high temperature above, irreversible loss is less than 2%；
(4) add antioxidation and the corrosion resistance of product, at 80 DEG C, place 24 hours in the baking oven of the relative humidity of 80%
Carry out damp and hot experiment, record damp and hot weightless than between for 0.001-0.005%, by microscopic without red rust speckle；
(5) product of the present invention has the HCJ (Hci) of 750-797kA/m, the high remanent magnetism (Br) of 890-920mT and
128Kj/m3Above maximum magnetic energy product (BHmax).
(6) product of the present invention is easy to small-sized micromodule equipment and is carried out operation of magnetizing, it is adaptable to CD drive, the master of hard disk drive
Spindle motor and family's electric transducer such as motor and the motor of other small-sized classes, automobile, nuclear industry centrifuge, air-conditioning etc. other
Field.
Accompanying drawing explanation
Fig. 1 is the microphotograph of permanent-magnet alloy structure after Mo element adds；
Fig. 2 is the microphotograph of permanent-magnet alloy structure before Mo element adds；
Fig. 3 is the product of the present invention microphotograph after damp and hot experiment.
Detailed description of the invention
The specific embodiment of the following description present invention, in order to be more fully understood that the present invention, following example only the most for the purpose of illustration, no
Should be used to limit the present invention and the scope of claim.
Embodiment 1:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 18%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.5%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 1:
Embodiment 2:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 20%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.5%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 2:
Embodiment 3:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 22%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.5%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 3:
With transmission electron microscope (TEM), the sample of preparation having been carried out crystal structure analysis, Fig. 1 shows this sample transmission electricity
Mirror photo, in photo, canescence is principal phase Nd2Fe14B crystal grain, the big crystal grain of atrous is α-Fe crystal grain, Nd2Fe14Putting down of B crystal grain
All grain sizes are 23nm, may be significantly smaller than the mean grain size of the General N dFeB material without Mo, and the crystal grain of α-Fe is average
Grain size is 48nm, bigger than the mean grain size of the General N dFeB material without Mo.The interpolation of this explanation Mo has refined crystalline substance
Grain.
Embodiment 4:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 21%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 3.0%, and the atomic percent of Mo is 0.5%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 4:
Embodiment 5:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 22%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.3%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 5:
Embodiment 6:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 22%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.2%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 6:
Embodiment 7:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 22%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and the atomic percent of Mo is 0.1%, and surplus is ferrum, in inert gas argon
Under the protection of gas, put in vacuum melting furnace and smelt, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is entered
Row rapid quenching, wheel speed is about 20-24m/s, crushed 40 eye mesh screens, and moved back at a temperature of 550-600 DEG C after obtaining metal sheet band
Fire 30 minutes, measures its magnetic property by the sample vibrating specimen magnetometer (VSM) of preparation, and performance is as shown in the table:
Table 7:
Embodiment 8:
According to formula as below, Pr-Nd alloy (wherein Pr content 25%), atomic percent is 22%, Fe-B alloy (wherein B
Content is 19%), the atomic percent of B is 2.0%, and surplus is ferrum, under the protection of noble gas argon, puts into vacuum melting
Smelting in stove, obtain 45 kilograms of uniform alloy pigs of composition, then the alloy pig obtained is carried out rapid quenching, wheel speed is about
20-24m/s, crushed 40 eye mesh screens after obtaining metal sheet band, anneal 30 minutes at a temperature of 550-600 DEG C, by preparation
Its magnetic property measured by sample vibrating specimen magnetometer (VSM), and performance is as shown in the table:
Table 8:
With transmission electron microscope (TEM), the sample of preparation having been carried out crystal structure analysis, Fig. 2 shows this sample transmission electricity
Mirror photo, in photo, canescence is principal phase Nd2Fe14B crystal grain, the big crystal grain of atrous is α-Fe crystal grain, Nd2Fe14Putting down of B crystal grain
All grain sizes are 47nm, more significantly larger than the mean grain size of the NdFeB material containing Mo.
Embodiment 9:
The corrosion resistance of test sample.Certain time test weight change in high temperature high humidity atmosphere put into by sample by this experiment,
And then evaluate the decay resistance of product.In the present embodiment, respectively the sample 1-5 of constant weight is respectively put in paper tinsel box, uses
Balance is weighed, then puts it in 85 DEG C and the relative humidity atmosphere of 85%, after placing 24 hours, is re-weighed, see table 9 institutes
Show:
Table 9:
| Sample number into spectrum | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 |
| Increase weight under double 85 states % | 0.0028 | 0.0030 | 0.0022 | 0.0033 | 0.0035 |
Thus description of test, NdFeB magnetic powder, after prepared by this recipe ratio, there is no red rust with microscope observation after 24 hours and produces,
Fig. 3 shows the microscope enlarged photograph after sample damp heat test, shows that sample has good corrosion resistance.
Embodiment 10:
This sample 1-3 is prepared as after the magnet of φ 10*10mm magnetizes, is respectively put into the baking oven 8 hours of 100 DEG C, 120 DEG C
Baking oven 8 hours, the baking oven of 160 DEG C is after 8 hours, and taking-up SF-6 type magnetic-flux meter (1 grade) measures its flux loss %, such as table 10
Shown in:
Table 10:
| Sample number into spectrum | Sample 1 | Sample 2 | Sample 3 |
| Heat 8 hours 100 degree of reductions percentage ratio (mWb) | -3.75% | -3.41% | -4.18% |
| Heat 8 hours 120 degree of reductions percentage ratio (mWb) | -1.78% | -1.27% | -1.13% |
| Heat 8 hours 160 degree of reductions percentage ratio (mWb) | -1.12% | -1.15% | -0.97% |
Being reached a conclusion by testing data above, magnetic powder makes bonded permanent magnet under work in hot environment, flux loss ＜ 5%, and temperature is the highest,
Flux loss more tends towards stability, and shows the serviceability of excellence.
As can be seen from the above data, after in rare earth permanent-magnetic material, part Nd is replaced by Pr, its remanent magnetism and maximum magnetic energy product have
It is obviously improved, maintains excellent decay resistance, significantly improve operating temperature.
Particularly, the embodiment of x can be 14.2,15,16,17,18,19,20,21,22,23,24,25,26,
27,28,29,30 or 30.5, it is also possible to be the decimal between two adjacent values of any of the above.
Particularly, the embodiment of y can be 1.2,2,3,4 or 4.8, it is also possible to is between two adjacent values of any of the above
Decimal.
Particularly, the embodiment of z can be 0.1,1 or 2, it is also possible to is the decimal between two adjacent values of any of the above.
Claims (9)
1. a high temperature resistant type high magnetic rare earth permanent-magnetic material, it is characterised in that its basic representation is: RxFe100-x-y-zByMz；
Wherein, the alloy that R is made up of according to the ratio of 1:3 LREE Pr, Nd, Fe is ferrum element, and B is boron element, and M is molybdenum element；X span be 14.2-30.5, y span be 1.2-4.8, z span be 0.1-2.0.
High temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 1, it is characterised in that described x span be 14.2-23, y span be 1.2-3.6, z span be 0.1-1.5.
High temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 1, it is characterised in that described x span be 15-20.5, y span be 1.8-3.1, z span be 0.3-1.0.
4. the preparation method of a high temperature resistant type high magnetic rare earth permanent-magnetic material as claimed in claim 1; it is characterized in that; with Pr-Nd alloy, Fe-B alloy and metal Mo as raw material; under the protection of noble gas; in vacuum melting furnace, carry out vacuum metling, obtain the uniform alloy pig of composition, the more above-mentioned alloy pig obtained is carried out fast quenching strip casting process; crushed screen cloth after obtaining metal sheet band, and made annealing treatment.
The preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 4, it is characterised in that in described Pr-Nd alloy, Pr content is 25%, and atomic percent is 22%.
The preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 4, it is characterised in that in described Fe-B alloy, B content is 19%, and the atomic percent of B is 3%.
The preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 4, it is characterised in that the atomic percent of described Mo is 0.2%.
The preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 4, it is characterised in that it is 20-24m/s that described fast quenching strip casting controls wheel speed.
The preparation method of high temperature resistant type high magnetic rare earth permanent-magnetic material the most according to claim 4, it is characterised in that described annealing temperature is 500-650 DEG C, and annealing time is 25-40min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279810A (en) * | 1997-10-30 | 2001-01-10 | 住友特殊金属株式会社 | High corrosion-resistant R-Fe-B-base bonded magnet and method of manufacturing the same |
| CN1986856A (en) * | 2005-12-19 | 2007-06-27 | 锦州东方微纳科技有限公司 | High stability and high magnetism quenched R-Fe-B base permanent magnetic alloy powder |
| CN101241789A (en) * | 2007-11-07 | 2008-08-13 | 绵阳西磁科技开发公司 | A lanthanon permanent magnetic powder and its making method |
| CN103559971A (en) * | 2013-10-22 | 2014-02-05 | 江西江钨稀有金属新材料有限公司 | Nanometer rare earth permanent magnetic material with high-temperature stability and preparation method thereof |
| CN104835641A (en) * | 2014-02-12 | 2015-08-12 | 丰田自动车株式会社 | Method for producing rare-earth magnet |
-
2016
- 2016-03-11 CN CN201610136736.0A patent/CN105810380A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279810A (en) * | 1997-10-30 | 2001-01-10 | 住友特殊金属株式会社 | High corrosion-resistant R-Fe-B-base bonded magnet and method of manufacturing the same |
| CN1986856A (en) * | 2005-12-19 | 2007-06-27 | 锦州东方微纳科技有限公司 | High stability and high magnetism quenched R-Fe-B base permanent magnetic alloy powder |
| CN101241789A (en) * | 2007-11-07 | 2008-08-13 | 绵阳西磁科技开发公司 | A lanthanon permanent magnetic powder and its making method |
| CN103559971A (en) * | 2013-10-22 | 2014-02-05 | 江西江钨稀有金属新材料有限公司 | Nanometer rare earth permanent magnetic material with high-temperature stability and preparation method thereof |
| CN104835641A (en) * | 2014-02-12 | 2015-08-12 | 丰田自动车株式会社 | Method for producing rare-earth magnet |
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