CN106205919A - Use the method that nanometer two-phase composite permanent-magnetic material is quickly prepared in electron beam heating - Google Patents
Use the method that nanometer two-phase composite permanent-magnetic material is quickly prepared in electron beam heating Download PDFInfo
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- H—ELECTRICITY
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- 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
- H01F1/012—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/11—Making amorphous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a kind of method using electron beam heating quickly to prepare nanometer two-phase composite permanent-magnetic material, first rare-earth transiting group metal alloy is prepared, then use rapid solidification that alloy preparation is become amorphous thin ribbon, use electron beam heating quick to amorphous thin ribbon again, quickly obtain composition and microstructure uniform nanometer two-phase composite permanent-magnetic material after cooling.The method just can make non-crystalline material be warming up to 1000 DEG C or higher temperature within the time of 0.1～1 second, and crystallization occurs, and preparation efficiency is efficient, prepared nanometer two-phase composite permanent-magnetic material material grains fine uniform and excellent performance.
Description
Technical field
The present invention relates to the preparation field of permanent magnet material, be specifically related to a kind of utilization electron beam heating and quickly prepare nano double
The method of phase composite permanent-magnetic material
Background technology
Rare earth permanent-magnetic material is a kind of important basic function material, occupies critical role at information and energy field.By
It is automatic that the functional device that rare earth permanent-magnetic material is constituted has become computer, the network information, communication, Aero-Space, traffic, office
Change, household electrical appliances, health, keep healthy, generate electricity the Core Feature device with high-technology fields such as power.It is generally believed that magnetic material
Material is currently to be only second to semi-conducting material to have a wide variety of class functional material in new and high technology with conventional art.One
Country consumes the quantity of rare earth permanent-magnetic material per capita and has become as one of yardstick weighing the rich level of this country.Therefore carry out dilute
The research tool of soil permanent magnet material is of great significance.
Rare earth permanent-magnetic material research truly will be from K.J.Strnat of Dayton university of the U.S. in 1966 et al.
First generation SmCo of invention5Start, and after this in time less than 20 years, as permanent magnet material obtains and emerges rapidly in large numbersBamboo shoots after a spring rain
Development, successively occurs in that second filial generation permanent magnet material Sm2Co17(1977) and third generation permanent magnet material Nd2Fe14B (nineteen eighty-three), and
Thus spin-up eighties of last century worldwide in latter stage research and explore the upsurge of a new generation's permanent magnet material.Representative work includes
(1) rare earth Fe-N clearance type nitride.Nineteen ninety Ireland Trinity University Coey professor seminar and Yang Yingchang institute of Peking University
Scholar seminar interstitial atom effects based on nitrogen in rare earth ferroalloy, finds Sm2Fe17Nx(being called for short samarium ferrum nitrogen) and Nd (Fe,
M)12Nx(being called for short neodymium ferrum nitrogen) has the intrinsic magnetic properties of excellence, can match in excellence or beauty with neodymium iron boron.(2) nanometer two-phase composite permanent-magnetic material.
Coehoom of Dutch Philips in 1988 et al. is first at Nd4Fe77.5B18.5Material in be found that remanence enhancement, and this
Plant effect and be derived from hard magnetic phase Nd2Fe14Exchange-coupling interaction between B and soft magnetism phase Fe nanocrystal.Moral in 1991
Kneller of state et al. elaborates that the spin-exchange-coupled between the hard magnetic phase of nanocrystalline yardstick and soft magnetism phase can make theoretically
Material obtains high-coercive force and the high saturation and magnetic intensity of soft magnetism phase of hard magnetic phase simultaneously, therefore can have the highest magnetic energy
Long-pending.If Skomski and Coey in 1993 et al. prediction theoretically can realize the directivity arrangement of hard magnetic phase, then each to different
The nanometer two-phase composite permanent-magnetic material of property maximum magnetic energy product in theory can reach about 125MGOe.Nanometer two-phase is compound forever
Magnetic material, owing to having the maximum magnetic energy product of superelevation in theory and can be used for preparation bonding or sintered magnet, therefore suffers from
Pay close attention to widely and study.
Rare-earth iron-boron compound and α-Fe or Fe3The Nanocrystalline Two-phase Composite Permanent magnets that B is constituted is that one is typically received
The brilliant two-phase composite permanent-magnetic material of rice.In order to make hard magnetic phase realize stronger coupling effect mutually with soft magnetism, it is necessary for Hard Magnetic
The crystallite dimension of property phase and soft magnetism phase controls at nanoscale, and the crystallite dimension of soft magnetism phase is necessarily less than or and Hard Magnetic
Property phase rare-earth iron boron domain wall thickness twice yardstick (10nm) suitable, suitable technology must be taked to go to realize this microcosmic for this
Structure.
Existing research shows, uses rapid solidification can prepare Nd2Fe14B or Pr2Fe14B is that the nanometer two-phase of base is combined
Permanent magnet material, existing technology path has two: the rare-earth iron-boron alloy of rich ferrum is used rapid solidification to be directly prepared as receiving by (1)
Meter Shuan Xiang composite permanent-magnetic material.The advantage of the method is that technique is simple, low cost；Shortcoming is owing to roller speed is moderate, therefore obtains
Crystal grain relatively thick, and owing to the scope of freedom and patch roll surface rate of cooling are different, so the microstructure of sample and magnetic property also inequality
Even；(2) use rapid solidification to be first prepared as amorphous the rare-earth iron-boron alloy of rich ferrum, obtain nanometer by Crystallizing treatment the most again
Two-phase composite permanent-magnetic material.The advantage of the method is that the crystal grain obtained is comparatively fine, and microstructure is the most uniform；Deficiency is
The conventional annealing process heating-up time is the longest, inefficient.
The present invention proposes a kind of method adding hot preparation nano double phase composite permanent-magnetic material by electron beam, and the method exists
Just can realize quickly heating and crystallization of the neodymium iron boron amorphous thin ribbon to rich ferrum in the time range of 0.1-1 second, prepared receives
Rice double-phase composite uniform small grains, permanent magnetism phase and soft magnetism the most easily realize efficient spin-exchange-coupled, the material of final preparation
Material shows the behavior of single magnetic phase and excellent magnetic property, and this illustrates that this method is highly effective.Relative to routine
Annealing, the method rate of heat addition is high, and heating region is the most highly uniform simultaneously and easily realizes, and the material property obtained
It is superior to material property prepared by conventional annealing.
Summary of the invention
A kind of method that it is an object of the invention to provide quick preparation nanometer two-phase composite permanent-magnetic material, it is desirable to this preparation side
Method is simple, and efficiency is high, and the nanometer two-phase composite permanent-magnetic material obtained has uniform microstructure and excellent magnetic
Energy.
Technical scheme is as follows:
A kind of method of quick preparation nanometer two-phase composite permanent-magnetic material, comprises the following steps:
1) rare-earth transiting group metal alloy R is preparedx(Fe,M)y(B,C)z, wherein R represents all rare earths unit including Y
One or more in element；M represents one or more in metal；X, y and z represent atomic ratio, wherein 3≤x≤11,83≤y
≤ 93,4≤z≤10, x+y+z=100；The atomic ratio of element M and Fe is between 1:99～10:90；The atomic ratio of C Yu B is situated between
Between 1:99～60:40；
2) above-mentioned alloy use rapid solidification preparation become amorphous thin ribbon；
3) electron beam is used to step 2) amorphous thin ribbon prepared quickly heats, and quickly obtains composition and microcosmic knot after cooling
Structure uniform nanometer two-phase composite permanent-magnetic material.
Above-mentioned preparation method, step 1) electric arc melting or Induction Melting Technology can be used to prepare rare-earth transiting group metal conjunction
Gold Rx(Fe,M)y(B,C)z, wherein R is preferably La, Ce, Pr, Nd, Tb, Dy etc., and M is preferably Co, Nb, Zr, Ga, Cu, Al, V, Cr
Deng.
Step 2) use rapid solidification, suitable roller speed (10～50m/s) under the conditions of by step 1) alloy preparation become
Amorphous thin ribbon, the width of amorphous thin ribbon is 3～5mm, and thickness is 0.3～0.5mm.
Step 3) amorphous thin ribbon is put in electron beam heating chamber, it is evacuated to 8 × 10-4～3 × 10-3Handkerchief, uses electronics
Restrainting heating quick to amorphous thin ribbon, wherein the accelerating potential of electron beam is preferably 5～30 kilovolts, accelerate electric current be preferably 0.5～
10 milliamperes, and the continuous heating time be preferably 0.1～1 second.
Said method uses electron beam heating technique that amorphous thin ribbon realizes quickly heating, just may be used within the time of 0.1 second
Fast to make amorphous thin ribbon realize in the crystallization temperature being heated to specifying by amorphous thin ribbon, and the time range about the 0.1-1 second
Speed crystallization.Amorphous thin ribbon after heating crystallization can quickly realize cooling by modes such as water-cooleds, it is thus achieved that nanometer two-phase is compound forever
Magnetic material.
Nanometer two-phase composite permanent-magnetic material prepared by the inventive method includes a class hard magnetic phase (such as R2Fe14B etc.) and
Another kind of soft magnetism phase (such as α-Fe, Co or Fe3B), hard magnetic phase crystallite dimension is between 10～50 nanometers, and soft magnetism is mutually brilliant
Particle size is between 3～20 nanometers, and the volume content of soft magnetism phase, 5～60%, shows single magnetic on Magnetic Test
The behavior of phase.
The method that the present invention utilizes electron beam to heat prepares nanometer two-phase composite permanent-magnetic material, within the time of 0.1～1 second
Non-crystalline material can be made to be warming up to 1000 DEG C or higher temperature, and crystallization occurs, the most quickly cool down, its preparation efficiency is current
In numerous preparation nanometer two-phase composite permanent-magnetic material methods the most efficient.This technology is by fast for the rare-earth iron-boron amorphous thin ribbon of rich ferrum
Speed heating crystallization becomes the nanometer two-phase composite permanent-magnetic material of uniform small grains and excellent performance, hence it is evident that improve tradition crystallization
Annealing process prepares nanometer two-phase permanent magnet material process time length and micro structure and the uneven problem of magnetic property, is highly suitable for
The preparation of nanometer two-phase composite permanent-magnetic material.
Accompanying drawing explanation
Fig. 1 be the soft magnetism phase volume fraction that embodiment 1 uses electron beam heating crystallization to obtain be about 15%
Nd10Fe83.3B6.2Nb0.2Cu0.3The micro-structure diagram of Nanocrystalline Two-phase Composite Permanent magnets.
Fig. 2 is the soft magnetism phase that embodiment 1 uses that electron beam (solid line) and conventional annealing stove (dotted line) heating crystallization obtain
Volume fraction is the Nd of about 15%10Fe83.3B6.2Nb0.2Cu0.3The hysteresis curve of Nanocrystalline Two-phase Composite Permanent magnets.
Fig. 3 be the soft magnetism phase volume fraction that embodiment 4 uses electron beam heating crystallization to obtain be about 35%
Nd6Pr2Fe84.3Co1B6.2Zr0.2Ga0.3The micro-structure diagram of Nanocrystalline Two-phase Composite Permanent magnets.
Fig. 4 is the soft magnetism phase that embodiment 4 uses that electron beam (solid line) and conventional annealing stove (dotted line) heating crystallization obtain
Volume fraction is the Nd of about 35%6Pr2Fe84.3Co1B6.2Zr0.2Ga0.3The hysteresis curve of Nanocrystalline Two-phase Composite Permanent magnets.
Detailed description of the invention
Describe the present invention further below by specific embodiment, but limit the present invention never in any form
Scope.
Embodiment 1:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 15%, electricity is first passed through
Arc melting technique prepared composition is Nd10Fe83.3B6.2Nb0.2Cu0.3Alloy；
(2) by rapid solidification, under conditions of roller speed is 40m/s, above-mentioned alloy is prepared as amorphous thin slice；
(3) to Nd10Fe83.3B6.2Nb0.2Cu0.3Amorphous thin slice is 3 × 10-3Under the vacuum condition of handkerchief, utilization accelerating potential is
Sample is heated by 10kV and the electron beam that acceleration electric current is 2.5mA so that it is be warmed up to 750 DEG C at 0.1 second in time range,
Then keep within 0.1 second, making amorphous thin slice generation crystallization, quickly cool down finally by water-cooled, it is thus achieved that the most even excellent performance of micro structure
The composite permanent-magnetic material of nanometer two-phase.Its microstructure is shown in that Fig. 1, magnetism testing result are shown in Fig. 2.Bold portion in Fig. 2
The magnetic property figure of the material that expression amorphous thin ribbon obtains under above-mentioned electron beam heating condition；According to alternating gradient gaussmeter to non-
The test of brilliant strip electron beam heat treating materials magnetic property, after process, the indices performance of material is as follows: Br=1.23T,iHc=6800Oe, (BH) max=15MGOe.
Simultaneously in order to compare, the dotted line in Fig. 2 represents the material that identical amorphous thin ribbon is obtained by the heating of conventional annealing stove
Material magnetic property figure, its concrete treatment conditions are 3 × 10 by these identical amorphous thin ribbons-3Add from room temperature under the vacuum condition of handkerchief
Then heat be incubated 10 minutes to 750 DEG C, is finally cooled fast to room temperature.By Fig. 2 it is apparent that use amorphous thin ribbon to pass through
After electron beam heat treated, the remanent magnetism of material, coercivity and magnetic energy product are substantially better than conventional annealing and process the coercive obtaining material
Power.
Embodiment 2:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 15%, electricity is first passed through
Arc melting technique prepared composition is Nd8Pr2Fe83.3B6.2Nb0.2Cu0.1Ga0.2Alloy；
(2) by rapid solidification, under conditions of roller speed is 45m/s, above-mentioned alloy is prepared as amorphous thin slice；
(3) to Nd8Pr2Fe83.3B6.2Nb0.2Cu0.1Ga0.2Amorphous thin slice is 3 × 10-3Under the vacuum condition of handkerchief, use and accelerate
Sample is heated by the electron beam that voltage is 15kV and acceleration electric current is 2.5mA so that it is be warmed up in time range at 0.1 second
770 DEG C, then keep within 0.3 second, making amorphous thin slice generation crystallization, quickly cool down the acquisition the most even property of micro structure finally by water-cooled
The composite permanent-magnetic material of nanometer two-phase that can be excellent.
Using the hysteresis curve of alternating gradient magnetometer survey material, result is as follows:
Br=1.25T,iHc=6400Oe, (BH) max=16MGOe
Embodiment 3:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 15%, electricity is first passed through
Arc melting technique prepared composition is Nd2Pr8Fe82.3Co1B6.2Zr0.2Cu0.3Alloy；
(2) by rapid solidification, under conditions of roller speed is 45m/s, above-mentioned alloy is prepared as amorphous thin slice；
(3) to Nd2Pr8Fe82.3Co1B6.2Zr0.2Cu0.3Amorphous thin slice is 3 × 10-3Under the high vacuum condition of handkerchief, utilization adds
Thin slice is used and within 0.1 second, makes it be warmed up to 730 DEG C by the electron beam that speed voltage is 15kV and acceleration electric current is 2.2mA, then keeps
Within 0.3 second, make amorphous thin slice generation crystallization, last quickly cooling.
Using the hysteresis curve of alternating gradient magnetometer survey material, result is as follows:
Br=1.2T,iHc=6400Oe, (BH) max=14MGOe
Embodiment 4:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 35%, electricity is first passed through
Arc melting technique prepared composition is Nd6Pr2Fe84.3Co1B6.2Zr0.2Ga0.3Alloy；
(2) by rapid solidification, under conditions of roller speed is 40m/s, above-mentioned alloy is prepared as amorphous thin slice；
(3) to Nd6Pr2Fe84.3Co1B6.2Zr0.2Ga0.3Amorphous thin slice is 3 × 10-3Under the high vacuum condition of handkerchief, utilization adds
Thin slice is used and within 0.1 second, makes it be warmed up to 740 DEG C by the electron beam that speed voltage is 10kV and acceleration electric current is 3.2mA, then keeps
Within 0.1 second, make amorphous thin slice generation crystallization, last quickly cooling.Its microstructure is shown in that Fig. 3, magnetism testing result are shown in Fig. 4.Fig. 4
In bold portion represent the magnetic property figure of material that amorphous thin ribbon obtains under above-mentioned electron beam heating condition；According to alternation ladder
The degree gaussmeter test to amorphous thin ribbon electron beam heat treating materials magnetic property, after process, the indices performance of material is such as
Under: Br=1.4T,iHc=5000Oe, (BH) max=17MGOe.
Simultaneously in order to compare, the dotted line in Fig. 4 represents the material that identical amorphous thin ribbon is obtained by the heating of conventional annealing stove
Material magnetic property figure, its concrete treatment conditions are 3 × 10 by these identical amorphous thin ribbons-3Add from room temperature under the vacuum condition of handkerchief
Then heat be incubated 10 minutes to 740 DEG C, is finally cooled fast to room temperature.By Fig. 4 it is apparent that use amorphous thin ribbon to pass through
After electron beam heat treated, the remanent magnetism of material, coercivity and magnetic energy product are substantially better than conventional annealing and process the coercivity obtaining material
Embodiment 5:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 35%, electricity is first passed through
Arc melting technique prepared composition is Nd8Fe84.3Co1B6.2Zr0.2Nb0.3Alloy；
(2) by rapid solidification, under conditions of roller speed is 40m/s, it is prepared as amorphous thin slice by above-mentioned；
(3) to Nd8Fe84.3Co1B6.2Zr0.2Nb0.3Amorphous thin slice is 3 × 10-3Under the high vacuum condition of handkerchief, use and accelerate electricity
Thin slice utilization is made it be warmed up to 730 DEG C for 0.1 second for 15kV and the electron beam that acceleration electric current is 2.5mA by pressure, then keeps 0.3
Second makes amorphous thin slice generation crystallization, last quickly cooling.
Using the hysteresis curve of alternating gradient magnetometer survey material, result is as follows:
Br=1.45T,iHc=4800Oe, (BH) max=17.5MGOe
Embodiment 6:
(1) in order to obtain the nanometer two-phase composite permanent-magnetic material that soft magnetism phase volume fraction is about 35%, electricity is first passed through
Arc melting technique prepared composition is Nd8Fe84.3Co1B6.2Nb0.2Nb0.3Alloy；
(2) by rapid solidification, under conditions of roller speed is 45m/s, it is prepared as amorphous thin slice by above-mentioned；
(3) to Nd8Fe84.3Co1B6.2Nb0.2Nb0.3Amorphous thin slice is 3 × 10-3Under the high vacuum condition of handkerchief, use and accelerate electricity
Thin slice utilization is made it be warmed up to 720 DEG C for 0.1 second for 10kV and the electron beam that acceleration electric current is 3mA by pressure, then keeps making for 0.1 second
Amorphous thin slice generation crystallization, last quickly cooling.
Using the hysteresis curve of alternating gradient magnetometer survey material, result is as follows:
Br=1.42T,iHc=5100Oe, (BH) max=17MGOe.
Claims (9)
1. a method for quick preparation nanometer two-phase composite permanent-magnetic material, comprises the following steps:
1) rare-earth transiting group metal alloy R is preparedx(Fe,M)y(B,C)z, during wherein R represents all rare earth elements including Y
One or more；M represents one or more in metal；X, y and z represent atomic ratio, wherein 3≤x≤11,83≤y≤93,
4≤z≤10, x+y+z=100；The atomic ratio of element M and Fe is between 1:99～10:90；The atomic ratio of C Yu B is between 1:99
～between 60:40；
2) by step 1) the rare-earth transiting group metal alloy prepared uses rapid solidification preparation to become amorphous thin ribbon；
3) electron beam is used to step 2) amorphous thin ribbon prepared quickly heats, the most quickly cools down, and obtains composition and microcosmic knot
Structure uniform nanometer two-phase composite permanent-magnetic material.
2. the method for claim 1, it is characterised in that step 1) use electric arc melting or Induction Melting Technology to prepare dilute
Soil transition metal alloy.
3. the method for claim 1, it is characterised in that step 1) in R be the one in La, Ce, Pr, Nd, Tb and Dy
Or multiple, M is one or more in Co, Nb, Zr, Ga, Cu, Al, V and Cr.
4. the method for claim 1, it is characterised in that step 2) under the conditions of roller speed 10～50m/s, use fast quenching skill
The preparation of rare-earth transiting group metal alloy is become amorphous thin ribbon by art.
5. the method for claim 1, it is characterised in that step 2) width of amorphous thin ribbon prepared is 3～5mm, thick
Degree is 0.3～0.5mm.
6. the method for claim 1, it is characterised in that step 3) amorphous thin ribbon is put in electron beam heating chamber, take out
Using electron beam heating quick to amorphous thin ribbon after vacuum, wherein the accelerating potential of electron beam is 5～30 kilovolts, accelerates electric current and is
0.5～10 milliampere, the continuous heating time is 0.1～1 second.
7. method as claimed in claim 6, it is characterised in that step 3) electron beam heating chamber is evacuated to 8 × 10-4～3 ×
10-3Handkerchief.
8. the method for claim 1, it is characterised in that step 3) amorphous thin ribbon through electron beam heat after, pass through water-cooled
Mode quickly cools down.
9. the nanometer two-phase composite permanent-magnetic material that prepared by method described in claim 1～8 any one, it is characterised in that this is received
Meter Shuan Xiang composite permanent-magnetic material includes a class hard magnetic phase and another kind of soft magnetism phase, and hard magnetic phase crystallite dimension is received in 10～50
Between meter, soft magnetism phase crystallite dimension is between 3～20 nanometers, and the volume content of soft magnetism phase is 5～60%, at Magnetic Test
On show the behavior of single magnetic phase.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111554504A (en) * | 2020-05-26 | 2020-08-18 | 北京大学 | Nano-scale textured rare earth permanent magnet material and preparation method thereof |
| WO2021143475A1 (en) * | 2020-01-16 | 2021-07-22 | 山东光韵智能科技有限公司 | Low-cost soft and hard dual-phase nano composite permanent magnet conductive contact and fabrication method therefor |
| CN114318179A (en) * | 2020-10-09 | 2022-04-12 | 华中科技大学 | Preparation method of high-strength super-toughness amorphous alloy composite material with bionic structure |
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| CN1697093A (en) * | 2004-05-10 | 2005-11-16 | 速敏科技股份有限公司 | Magnetic material of containing praseodymium |
| CN101717888A (en) * | 2009-11-26 | 2010-06-02 | 上海大学 | Nano-crystalline composite NdFeB permanent magnetic alloy and method for producing same |
| CN101724800A (en) * | 2009-12-11 | 2010-06-09 | 河北师范大学 | Method for crystallizing nanometer composite permanent magnetic material |
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| JPH06251920A (en) * | 1993-02-26 | 1994-09-09 | Hitachi Metals Ltd | Rare earth element permanent magnet |
| CN1697093A (en) * | 2004-05-10 | 2005-11-16 | 速敏科技股份有限公司 | Magnetic material of containing praseodymium |
| CN101717888A (en) * | 2009-11-26 | 2010-06-02 | 上海大学 | Nano-crystalline composite NdFeB permanent magnetic alloy and method for producing same |
| CN101724800A (en) * | 2009-12-11 | 2010-06-09 | 河北师范大学 | Method for crystallizing nanometer composite permanent magnetic material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021143475A1 (en) * | 2020-01-16 | 2021-07-22 | 山东光韵智能科技有限公司 | Low-cost soft and hard dual-phase nano composite permanent magnet conductive contact and fabrication method therefor |
| CN111554504A (en) * | 2020-05-26 | 2020-08-18 | 北京大学 | Nano-scale textured rare earth permanent magnet material and preparation method thereof |
| CN114318179A (en) * | 2020-10-09 | 2022-04-12 | 华中科技大学 | Preparation method of high-strength super-toughness amorphous alloy composite material with bionic structure |
| CN114318179B (en) * | 2020-10-09 | 2022-12-09 | 华中科技大学 | Preparation method of high-strength super-toughness amorphous alloy composite material with bionic structure |
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