CN113450986A - Rare earth permanent magnet and preparation method and application thereof - Google Patents
Rare earth permanent magnet and preparation method and application thereof Download PDFInfo
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- CN113450986A CN113450986A CN202110628471.7A CN202110628471A CN113450986A CN 113450986 A CN113450986 A CN 113450986A CN 202110628471 A CN202110628471 A CN 202110628471A CN 113450986 A CN113450986 A CN 113450986A
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 22
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 2
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- 229910052693 Europium Inorganic materials 0.000 claims description 2
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- 229910052772 Samarium Inorganic materials 0.000 claims description 2
- 229910052771 Terbium Inorganic materials 0.000 claims description 2
- 229910052775 Thulium Inorganic materials 0.000 claims description 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 15
- 229910001172 neodymium magnet Inorganic materials 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 230000005347 demagnetization Effects 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000006356 dehydrogenation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- -1 neodymium iron boron rare earth Chemical class 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- DBGSRZSKGVSXRK-UHFFFAOYSA-N 1-[2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]acetyl]-3,6-dihydro-2H-pyridine-4-carboxylic acid Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CCC(=CC1)C(=O)O DBGSRZSKGVSXRK-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000100 multiple collector inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005258 radioactive decay Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- H01F1/0575—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 pressed, sintered or bonded together
- H01F1/0577—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 pressed, sintered or bonded together sintered
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The invention discloses a rare earth permanent magnet and a preparation method and application thereof, wherein the rare earth permanent magnet is prepared from a raw material B11The content of B isotope is at least 85 percent, and11the B isotope is mainly distributed in R of the rare earth permanent magnet material2Fe14B in the crystal lattice of the main phase grains. The invention has good heat resistance, wherein the element B is11The content of the B isotope is at least 85 wt%, so that the absorption of the neodymium iron boron magnet to neutron irradiation can be greatly reduced, the demagnetization phenomenon of the magnet in irradiation can be effectively avoided, and the use requirement of the special permanent magnet motor under the irradiation working condition can be met.
Description
Technical Field
The invention belongs to the technical field of permanent magnets, and particularly relates to a rare earth permanent magnet and a preparation method and application thereof.
Background
With the development of space detection technology and nuclear energy utilization technology in China, permanent magnetic materials are used as components of key parts such as particle accelerators, low-temperature undulators, reactor motors, traveling wave tubes and the like, and are increasingly widely applied to aerospace and nuclear power technology. Magnetism of general neodymium iron boron rare earth permanent magnetic material after being irradiated by various particles in environmentCan be irreversibly changed because the prior art uses natural B element in the manufacturing process of the Nd-Fe-B permanent magnet, and the natural B element has two stable isotopes, namely10Isotope B and11b isotopes, with abundances 19.78% and 80.22%, respectively.10The B isotope has a large neutron absorption cross section, is a good absorber for neutron irradiation, and has an absorption cross section for thermal neutrons of 3837 bar (1B-10)-24cm2). The absorption cross section of boron in natural abundance to thermal neutrons is close to 750 bar, and11isotope B is only 0.05 bar, so10The absorption cross section of the B isotope to the thermal neutrons is more than 5 times of that of natural abundance boron, and simultaneously the B isotope is1176700 times the isotope of B. The neodymium iron boron (NdFeB) permanent magnet generally has a large amount of natural B element due to the used natural B element10The B isotope captures neutrons in the irradiation process and releases a plurality of high-energy gamma rays, and the high-energy neutron capture and the gamma ray release can seriously damage the magnetic domain structure of the neodymium iron boron, so that a local anti-magnetization domain is formed, or local thermal demagnetization is generated, and finally the demagnetization of the magnet is failed.
The special permanent magnet motor has irradiation conditions such as outer space and nuclear power station, and the Nd-Fe-B permanent magnet is easy to be used in the special permanent magnet motor10The invention provides a preparation method of an irradiation-resistant neodymium iron boron rare earth permanent magnet material, which can greatly improve the demagnetization resistance of the neodymium iron boron permanent magnet material under the working conditions and improve the working reliability of relevant important parts.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a rare earth permanent magnet.
The invention also aims to provide a preparation method of the rare earth permanent magnet.
It is a further object of the present invention to provide the use of the above rare earth permanent magnet.
The technical scheme of the invention is as follows:
a rare earth permanent magnet comprises the following raw materials in percentage by mass:
R：28-34wt％：
Fe：60-71wt％；
B：0.84-1.15wt％；
M：0-5wt％；
wherein R is at least one of Pr, Nd, Dy, Tb, Ho, Pm, Sm, Eu, Gd, Er, Tm, Yb and Lu, M is at least one of Co, Al, Cu, Zn, In, Si, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Ti, Hf, Ta, W, O, C, N, S and P, B is11The content of B isotope is at least 85 percent, wherein11The B isotope is mainly distributed in R of the rare earth permanent magnet material2Fe14B in the crystal lattice of the main phase grains.
In a preferred embodiment of the present invention, in B11The content of B isotope is at least 88%.
In a preferred embodiment of the invention, the density is from 7.50 to 7.90g/cm3。
The preparation method of the rare earth permanent magnet material comprises11The raw material of B isotope of B is added as initial raw material in the alloy smelting stage.
In a preferred embodiment of the invention, the method comprises alloy smelting, hydrogen crushing, airflow milling, oriented press forming, sintering, aging treatment and machining.
In the present invention, the raw material of the rare earth permanent magnet material is known to those skilled in the art as a raw material satisfying the element content percentage by mass of the R-Fe-B system permanent magnet material as described above.
In the present invention, the melting operation and conditions may be conventional in the art.
Preferably, the raw material is smelted in a high-frequency vacuum smelting furnace.
Preferably, the vacuum degree of the smelting furnace is less than 0.1Pa, and more preferably less than 0.02 Pa.
Preferably, the melting temperature is 1450-1550 ℃, more preferably 1500-1550 ℃.
In the invention, the casting operation and conditions can be conventional in the field and are generally carried out in an inert atmosphere to obtain the R-Fe-B permanent magnetic material alloy cast sheet.
The rare earth permanent magnet material is applied to the preparation of special permanent magnet motors operating under irradiation working conditions.
In the present invention, the operation and conditions for the hydrogen destruction may be conventional in the art. Generally, the hydrogen breaking comprises a hydrogen adsorption process and a dehydrogenation process, and the R-T-B series permanent magnet material alloy cast sheet can be subjected to hydrogen breaking treatment to obtain R-T-B series permanent magnet material alloy powder.
Preferably, the hydrogen absorption temperature of the hydrogen breaker is 20-300 ℃, for example, 25 ℃.
Preferably, the hydrogen absorption pressure of the hydrogen breaker is 0.12 to 0.19MPa, such as 0.19 MPa.
Preferably, the dehydrogenation time of the hydrogen destruction is 0.5 to 5 hours, for example, 2 hours.
Preferably, the dehydrogenation temperature of the hydrogen cracker is 450-600 ℃, for example 550 ℃.
In the present invention, the operation and conditions of the jet mill may be conventional in the art. Preferably, the air flow mill is used for sending the R-Fe-B series permanent magnet material alloy powder into an air flow mill for carrying out air flow mill continuous crushing to obtain R-Fe-B series permanent magnet material fine powder.
More preferably, the content of oxygen in the milling chamber of the jet mill in the jet mill is below 120 ppm.
More preferably, the rotation speed of the sorting wheel in the jet mill is 3500-4300 rpm/min, preferably 3900-4100 rpm/min, such as 4000 rpm/min.
More preferably, the grinding pressure of the jet mill is 0.3 to 0.5MPa, such as 0.4 MPa.
More preferably, the median diameter D50 of the R-Fe-B series permanent magnet material fine powder is 3 to 5.5pm, such as 4 μm.
In the present invention, the operation and conditions of the molding may be conventional in the art.
Preferably, the molding is performed under a magnetic field strength of 1.8T or more, for example, 1.8T, and under a nitrogen atmosphere.
In the present invention, the operation and conditions of the sintering may be conventional in the art.
Preferably, the sintering temperature is 900-1300 ℃, more preferably 1000-1100 ℃.
Preferably, the sintering time is 3-10 h, such as 8 h.
In the present invention, the operation and conditions of the primary or secondary aging may be conventional in the art.
Preferably, the primary ageing temperature is 880 ℃, 900 ℃ or 920 ℃.
Preferably, the secondary aging temperature is 450 ℃ to 560 ℃, more preferably 480 ℃ to 535 ℃, for example 485 ℃, 495 ℃, 505 ℃, 515 ℃ or 525 ℃.
Preferably, the time of the primary aging treatment is 2 to 5 hours, for example, 3 hours.
Preferably, the time of the secondary aging treatment is 2 to 5 hours, for example, 3 hours
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available, enriched with11The boron-containing raw material of the B isotope can be a simple substance of boron or an alloy containing boron.
In a preferred embodiment of the invention, the irradiation conditions include outer space and nuclear power plants.
The invention has the beneficial effects that: the invention has good heat resistance, wherein the element B is11The content of the B isotope is at least 85 wt%, so that the absorption of the neodymium iron boron magnet to neutron irradiation can be greatly reduced, the demagnetization phenomenon of the magnet in irradiation can be effectively avoided, and the use requirement of the special permanent magnet motor under the irradiation working condition can be met.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
Examples 1 to 7
The raw materials used for preparing the Re-Fe-B series permanent magnet material in the embodiment are shown in Table 1, and the preparation process is as follows:
(1) according to the formula shown in Table 1, the prepared raw materials are put into a crucible made of alumina, and vacuum melting is carried out in a high-frequency vacuum induction melting furnace at the temperature of 1500 ℃ under the condition that the vacuum degree is less than 0.02 Pa.
(2) Alloy smelting and casting processes: introducing Ar gas into a smelting furnace after vacuum smelting to enable the air pressure to reach 5.0 ten thousand Pa, then casting, and enabling the molten liquid to pass through a copper roller with the rotating speed of 40 revolutions per minute to prepare a rapid hardening alloy sheet with the thickness of 0.12-0.35mm, wherein in the casting process, chilled water needs to be introduced into the copper roller, and the water inlet temperature is less than or equal to 25 ℃; the quenched alloy is obtained at a cooling rate of 102-104 ℃/sec.
(3) Hydrogen crushing to obtain powder: placing the alloy sheet in a hydrogen breaking furnace, vacuumizing the hydrogen breaking furnace at room temperature, introducing hydrogen with the purity of 99.9% into the hydrogen breaking furnace, and maintaining the hydrogen pressure at 90kPa to ensure that the alloy sheet fully absorbs hydrogen; then vacuumizing and heating to 550 ℃, fully dehydrogenating the alloy sheet, and finally cooling to obtain powder.
(4) Milling powder by airflow: and (4) carrying out jet milling on the powder obtained in the step (3) under the nitrogen atmosphere of 0.65MPa to obtain fine powder.
(5) Orientation compression molding: and (4) pressing and forming the fine powder prepared in the step (4) in a magnetic field intensity of 1.5-1.6T to obtain a formed body.
(6) And (3) sintering: transferring the molded body to a sintering furnace, sintering at 1000-1100 ℃ for 2-8h under the conditions of helium atmosphere and vacuum degree lower than 0.5Pa, and cooling to room temperature to obtain a sintered body;
(7) aging treatment: carrying out two-stage aging treatment on the sintered body obtained in the step (6) in high-purity argon, wherein the temperature of the first-stage aging treatment is 900 ℃; the temperature of the secondary ageing was 500 ℃. The treatment time of the first-stage aging is 3h, the treatment time of the second-stage aging is 3h, and the magnet is cooled to room temperature to obtain a finished product magnet. The finished magnet was tested for density using the drainage method and the results are shown in table 2 below.
(8) And (3) machining: and (4) machining the material obtained in the step (7) to obtain a test sample with the diameter of 10mm and the thickness of 10 mm.
(8) Detecting the magnetic property before irradiation: and magnetizing the test sample, and measuring the magnetic flux value of the sample by using a fluxmeter.
(10) Neutron irradiation: placing the magnetized magnet in a non-magnetic fixture, placing in a CFBR-II fast neutron pulse reactor for neutron irradiation, wherein the neutron fluence at the irradiation distance is 4 multiplied by 1014n/cm2And stopping irradiating for 2 hours, taking out the sample, standing the sample for 24 hours, measuring the magnetic flux value of the sample after irradiation by using a fluxmeter after the induced radioactive decay of the sample reaches a safe dose, and calculating the magnetic flux decay rate of the sample before and after irradiation, wherein the test results are listed in the following table 2.
The contents of the respective components in the magnet were measured using a high frequency inductively coupled plasma emission spectrometer (ICP-OES, Horiba), in which the isotopic content of boron was measured using a multi-reception plasma mass spectrometer (MC-ICP-MS) (Neptune plus), and the detection results of the components were as shown in table 3 below. The flux values were measured using a fluxgate and a helmholtz coil.
TABLE 1 weight percentages of raw materials in each example and comparative example
| Number/wt% | Nd | Pr | Dy | 10B | 11B | Ti | Nb | Ga | Fe | 11/B/(10B+11B) |
| Example 1 | 18.3 | 9.2 | 1.5 | 0.001 | 0.999 | 0.25 | 0 | 0.6 | 69.15 | 99.90％ |
| Example 2 | 24.7 | 5 | 0.4 | 0.005 | 0.995 | 0 | 0.5 | 0.5 | 67.9 | 99.50％ |
| Example 3 | 15 | 17 | 0 | 0.01 | 0.99 | 0.2 | 0.2 | 0.3 | 66.3 | 99.00％ |
| Example 4 | 15 | 17 | 0 | 0.05 | 0.95 | 0.2 | 0.2 | 0.3 | 66.3 | 95.00％ |
| Example 5 | 15 | 17 | 0 | 0.08 | 0.92 | 0.2 | 0.2 | 0.3 | 66.3 | 92.00％ |
| Example 6 | 15 | 17 | 0 | 0.12 | 0.88 | 0.2 | 0.2 | 0.3 | 66.3 | 88.00％ |
| Example 7 | 15 | 17 | 0 | 0.145 | 0.855 | 0.2 | 0.2 | 0.3 | 66.3 | 85.50％ |
| Comparative example 1 | 15 | 17 | 0 | 0.2 | 0.8 | 0.2 | 0.2 | 0.3 | 66.3 | 80.00％ |
| Comparative example 2 | 15 | 17 | 0 | 0.3 | 0.7 | 0.2 | 0.2 | 0.3 | 66.3 | 70.00％ |
| Comparative example 3 | 15 | 17 | 0 | 0.5 | 0.5 | 0.2 | 0.2 | 0.3 | 66.3 | 50.00％ |
| Comparative example 4 | 15 | 17 | 0 | 0.9 | 0.1 | 0.2 | 0.2 | 0.3 | 66.3 | 10.00％ |
TABLE 2 magnetic flux and magnet loss rate of each of examples and comparative examples
TABLE 3 results of measurement of magnet component in examples and comparative examples
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. The rare earth permanent magnet is characterized in that the raw materials comprise the following components in percentage by mass:
R：28-34wt％；
Fe：60-71wt％；
B：0.84-1.15wt％；
M：0-5wt％；
wherein R is at least one of Pr, Nd, Dy, Tb, Ho, Pm, Sm, Eu, Gd, Er, Tm, Yb or Lu, M is at least one of Co, Al, Cu, Zn, In, Si, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Ti, Hf, Ta, W, O, C, N, S or P, B is11The content of B isotope is at least 85 wt%.
2. A rare earth permanent magnet according to claim 1, wherein: in B mentioned11The content of B isotope is at least 88 wt%.
3. A rare earth permanent magnet according to claim 1, wherein: the density of the rare earth permanent magnet is 7.50-7.9g/cm3。
4. The method for producing a rare earth permanent magnet according to any one of claims 1 to 3, characterized in that: will contain the11B parityThe raw material of B of elements is added as initial raw material in the alloy smelting stage.
5. The method of claim 4, wherein: the method comprises the steps of alloy smelting, hydrogen crushing, powder making, airflow milling, oriented compression molding, sintering, aging treatment and machining.
6. The method of claim 5, wherein: the sintering temperature is 1000-1100 ℃.
7. Use of a rare earth permanent magnet according to any one of claims 1 to 3 in the manufacture of a specialty permanent magnet machine operating under irradiation conditions.
8. The use of claim 7, wherein: the irradiation working conditions comprise outer space and nuclear power stations.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114622138A (en) * | 2022-03-03 | 2022-06-14 | 上海大学 | A kind of11B-doped oxide dispersion strengthened alloy, preparation method and application thereof |
Citations (5)
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