CN106920611A - A kind of method and R-T-B series permanent magnetic materials for making high-coercive force sintering R-T-B permanent-magnet materials - Google Patents
A kind of method and R-T-B series permanent magnetic materials for making high-coercive force sintering R-T-B permanent-magnet materials Download PDFInfo
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- CN106920611A CN106920611A CN201511006102.5A CN201511006102A CN106920611A CN 106920611 A CN106920611 A CN 106920611A CN 201511006102 A CN201511006102 A CN 201511006102A CN 106920611 A CN106920611 A CN 106920611A
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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
- H01F1/0572—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 with a protective layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Abstract
The invention discloses a kind of method and R-T-B series permanent magnetic materials for making high-coercive force R-T-B series permanent magnetic materials, comprise the following steps：Step A, prepares the spherical powder containing heavy rare earth element；Step B, the R-T-B series permanent magnetic materials coating spherical powder containing heavy rare earth element being made to normal process in coating produced by laser cladding mechanism.The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, in the case where remanent magnetism is not influenceed, can not only significantly improve magnet coercivity, also considerably reduce the usage amount of heavy rare earth element.
Description
Technical field
R-T-B is sintered the invention belongs to permanent-magnet material technical field, more particularly to a kind of high-coercive force that makes
The method and R-T-B series permanent magnetic materials of permanent-magnet material.
Background technology
Sintering R-T-B system's rare earth permanent-magnetic materials have very wide as the most strong permanent-magnet material of current magnetic property
General application.Coercivity is one of measurement sintering R-T-B series permanent magnetic material job stabilitys extremely important
Performance indications, and it is to add heavy rare earth in the material to improve the coercitive topmost means of magnet
Element.But heavy rare earth element is rare due to reserves, refine difficult, and the easily reason such as pollution environment,
Price is very expensive, even if in the case where addition is relatively fewer, also occupies the magnet cost of raw material
In considerable part.
Therefore, either from properties of product are improved, production cost is reduced, or from economizing on resources, protect
Environmentally say, reduce the usage amount of heavy rare earth in R-T-B systems agglomeration permanent magnetic material, be all the time industry
An interior mostly important problem.
In order to realize diffusion of the heavy rare earth element on sintered Nd-Fe-B permanent magnetic material surface, Japanese scholars
Deshan L etc. sputter Dy/Tb metal levels by material surface, and are heat-treated, so that principal phase
Superficial layer is rich in Dy/Tb (referring to Deshan L, Shunji S, Takashi K, et al.Grain interface
modification and magnetic properties of NdFeB sintered magnets[J].Japanese J
Appl Phys.2008,47:7876.).Hiroyuki S etc. are using the dipping sintering in DyF3 solution
The method of NdFeB magnets, makes magnet surface form one layer of DyF3 film, is heat-treated in subsequent magnet
During, Dy and F grain boundary diffusions enter magnet (referring to Hiroyuki S, Yuichi S, Matahiro K.
Magnetic properties of a Nd-Fe-B sintered magnets with Dy segregation.[J].J
Appl Phys,2009,105:07A734.)。
But, the method productivity ratio that Dy/Tb is invested into NdFeB sintered magnets surface using sputtering is low,
And operation expense is too high.And the fluoride of Dy/Tb or oxide powder dipping are attached to magnet surface
And heat-treating methods can influence sample machining accuracy, increase operation, equally increased cost.In addition,
Dy/Tb material prices are expensive, either using sputtering, or using the method for solution dipping, Dy/Tb
Effective rate of utilization it is not high, directly affects the cost and adaptability of diffusion technique.
Therefore, in terms of the coercivity of R-T-B systems rare earth permanent-magnetic material is improved there is following lacking in prior art
Fall into：First, the effective rate of utilization of rare earth element is not high, causes cost to increase；2nd, process cost is high, together
Sample result in cost increase.
The content of the invention
It is an object of the invention to provide a kind of method for making high-coercive force R-T-B series permanent magnetic materials and
R-T-B series permanent magnetic materials, solve the coercivity aspect that prior art improves R-T-B systems rare earth permanent-magnetic material
The rare earth element effective rate of utilization of presence is not high and process cost problem high.
It is of the invention to the described method comprises the following steps：
Step A, prepares the spherical powder containing heavy rare earth element；
Step B, the R-T-B series permanent magnetic materials coating institute being made to normal process in coating produced by laser cladding mechanism
State the spherical powder containing heavy rare earth element.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, also includes
Following steps：
Step C, the R-T-B series permanent magnetic materials to having carried out coating produced by laser cladding are heat-treated.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, wherein walking
The method that rapid A prepares the spherical powder containing heavy rare earth element is Plasma Rotation electrode method.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, it is further, described to swash
Light coating mechanism includes generating laser, vacuum cavity, powder playpipe and object carrying support, the loading
Support is used to fix the R-T-B series permanent magnetic materials being made of normal process, and the powder playpipe is used
In described spherical containing heavy rare earth element to the R-T-B series permanent magnetic materials injection being made of normal process
Powder, the generating laser is used to launch laser beam to powder eject position, will be described containing heavy rare earth unit
The spherical powder of element is heated to be molten condition and then is ejected into the R-T-B systems being made of normal process forever
Magnetic material surface.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, wherein institute
The laser energy of laser Fu Tu mechanisms is stated for 1000~6000W, lasing beam diameter is 0.5~5mm, is swashed
Optical scanning speed is 1~20mm/s (millimeter is per second), and coat thickness is 5~100 μm.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, the powder
Expect that the speed of playpipe is 1~30g/min (gram every point).
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, to described
The painting thickness that covers of the R-T-B series permanent magnetic materials being made of normal process is 5~100 μm.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, to described
Carried out the R-T-B series permanent magnetic materials of coating produced by laser cladding be heat-treated is higher than 1Pa in vacuum
In vacuum drying oven, temperature is heated to 500~900 DEG C.
The method of the making high-coercive force R-T-B series permanent magnetic materials that the present invention is provided, further, to having entered
After the R-T-B series permanent magnetic materials blank of row coating produced by laser cladding is heat-treated, it is not higher than in pressure
Carried out under the Ar gas of 0.07MPa it is air-cooled, cooling velocity be more than 20 DEG C per minute.
Present invention also offers a kind of high-coercive force R-T-B series permanent magnetic materials, its remanent magnetism (Br) is more than
13.5kGs, coercivity is more than 20.0kOe, and the content of rare earth element Dy and Tb is less than 0.5%.
The beneficial effects of the present invention are：Be attached to for a small amount of heavy rare earth by the method for present invention coating produced by laser cladding
The magnet material surface being made of normal process, and spread by being heat-treated, formed necessarily in magnet surface
The heavy rare earth layer of concentration gradients, so as to the coercivity of magnet is improved into more than 5kOe on the basis of original,
And content of rare earth is relatively low, and its remanent magnetism is not influenceed.
Brief description of the drawings
Fig. 1 is the flow of the method for making high-coercive force sintering R-T-B permanent-magnet materials of the embodiment of the present invention
Schematic diagram；
Fig. 2 is the Dy spherical powders that the embodiment of the present invention is prepared by Plasma Rotation electrode method；
Fig. 3 is the schematic diagram that the embodiment of the present invention uses coating produced by laser cladding heavy rare earth powder.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but art technology
Personnel will be understood that the following example is merely to illustrate the present invention, and should not be regarded as limiting model of the invention
Enclose.Unreceipted actual conditions person in embodiment, the condition advised according to normal condition or manufacturer is carried out.
Agents useful for same or the unreceipted production firm person of instrument, be can by city available from conventional products.
The present invention provides a kind of method for making low heavy rare earth high-coercive force R-T-B series permanent magnetic materials.As schemed
Shown in 1, the method comprises the following steps：
Step A, prepares the spherical powder containing heavy rare earth element.
Specifically, the spherical powder using plasma rotary electrode method containing heavy rare earth element, Fig. 2 are prepared
Show the Dy spherical powders being made using Plasma Rotation electrode method.As shown in Fig. 2 made
10~50 μm of Dy spherical powder particle diameters average out to, and the fineness of each particle compares
More uniform, it is highly beneficial that this covers painting for follow-up laser such that it is able to improves the quality of final products.
Step B, the R-T-B series permanent magnetic materials coating institute being made to normal process in coating produced by laser cladding mechanism
State the spherical powder containing heavy rare earth element.
Specifically, after the R-T-B series permanent magnetic materials that normal process is made carry out surface cleaning, being put into
Comprising generating laser, vacuum cavity in the coating produced by laser cladding mechanism of powder playpipe and object carrying support, is produced
Product are fixed on object carrying support, and powder playpipe is with the speed of 1~30g/min (gram every point) on product
Fine powder of the injection containing heavy rare earth element, while generating laser launches laser beam to fine powder eject position,
Fine powder is heated to be molten condition and product surface is attached to.Wherein laser energy is 1000~6000W,
Lasing beam diameter is 0.5~5mm, and laser scan rate is 1~20mm/s (millimeter is per second), coating
Thickness degree is 5~100 μm.Fig. 2 shows the schematic diagram of coating produced by laser cladding process.
Step C, the R-T-B series permanent magnetic materials to having carried out coating produced by laser cladding are heat-treated.
Specifically, be coated with the product of heavy rare earth element be put into vacuum drying oven of the vacuum higher than 1Pa,
500~900 DEG C are heated product to, and is kept for 2~10 hours, then product is not higher than in pressure
Air-cooled using being carried out under Ar gas under conditions of 0.07MPa, cooling velocity is more than 20 DEG C per minute.
The R-T-B series permanent magnetic materials to having carried out coating produced by laser cladding are heat-treated, the heat treatment bag
Include diffusion and Ageing Treatment, diffusion refer to the rare earth element spherical powder of coating in permanent-magnet material diffusion inside,
And the final stage that Ageing Treatment is final products to be made.
The invention allows for a kind of high-coercive force R-T-B series permanent magnetic materials, its through made by above step,
The permanent-magnet material remanent magnetism (Br) is more than 13.5kGs, and coercivity is more than 20.0kOe, and rare earth element Dy
And/or the content of Tb is less than 0.5%.Below in an example, the data that apparatus body examination are obtained are illustrated
This coercivity R-T-B series permanent magnetic materials.
Technical characteristic of the invention and technology are illustrated below by the contrast of specific comparative example and embodiment
Effect, in following three groups of examples：Comparative example 1 and comparative example 2 are processed by conventional method and obtain magnet,
Embodiment 3 processes magnet, embodiment 3 and comparative example 1, comparative example 2 using method proposed by the present invention
Compare, in addition to the step of increasing coating produced by laser cladding heavy rare earth powder, material, step and side that it is used
Method can be with identical.Comparative example 1, comparative example 2 and embodiment 3 are described separately below, then to every
The result that individual example is obtained is analyzed.
Comparative example 1
Comparative example 1 is made the magnet sample without Dy elements using conventional method (normal process), its
Comprise the following steps that：
First, Nd-Fe-B alloys are made using conventional belt-rejecting technology, its composition proportion (percentage by weight,
It is similarly hereinafter)：31.0%Nd, 65.7%Fe, 1.0%Co, 0.1%Cu, 0.1%Al, 0.1%Zr, 1.0%B；
Then, the alloy is carried out the quick-fried treatment of hydrogen in the hydrogen crushing furnace of model XZHD-1000, hydrogen is inhaled
Below 150 DEG C, desorption temperature is 500~550 DEG C to temperature control, and addition is big in the meal for obtaining
About 0.1% zinc stearate lubricant is simultaneously mixed；
Then, above meal is crushed with the airflow milling of model AFG-400, obtains powder and put down
Equal granularity is 3.0 μm of fine powder；
Then, the fine powder is carried out under the magnetic field of 1.9T orientation compressing；
Then, the blank after shaping is put into high vacuum sintering furnace of the pressure less than 0.01Pa, is in temperature
It is sintered at 1080 DEG C, then at 900 DEG C and 500 DEG C Ageing Treatment is carried out to blank respectively；
Then, the magnet blank of acquisition is processed into the disk of Φ 20 × 4, and carries out magnetic property measurement,
Its performance is as shown in table 1；
Finally, magnet sample is chemically examined with ICP (inductive coupling plasma emission spectrograph),
Obtain magnet composition as shown in table 2.
Comparative example 2
Comparative example 2 is made the magnet sample containing Dy, device therefor and condition and contrast using conventional method
Example 1 is identical, and it is comprised the following steps that：
First, Nd-Fe-B alloys are made using belt-rejecting technology, its composition proportion (percentage by weight) is：
27.4%Nd, 3.6%Dy, 65.7%Fe, 1.0%Co, 0.1%Cu, 0.1%Al, 0.1%Zr, 1.0%B；
Then, the alloy is carried out into the quick-fried treatment of hydrogen in the hydrogen crushing furnace of model XZHD-1000, and is being obtained
About 0.1% zinc stearate lubricant is added in the meal for obtaining and mix；
Then, above meal is crushed with the airflow milling of model AFG-400, obtains powder and put down
Equal granularity is 3.0 μm of fine powder；
Then, the fine powder is carried out under the magnetic field of 1.9T orientation compressing；
Then, the blank after shaping is put into high vacuum sintering furnace, is sintered at being 1080 DEG C in temperature,
Ageing Treatment is carried out to blank at 900 DEG C and 500 DEG C respectively again；
Then, the magnet blank of acquisition is processed into the disk of Φ 20 × 4, and carries out magnetic property measurement, its
Performance is as shown in table 1；
Finally, magnet sample is chemically examined with ICP, obtains magnet composition as shown in table 2.
Embodiment 3
Experiment 3 is made the magnet sample containing Dy using the method that the present invention is provided, except step A, B, C
Outward, device therefor and experiment condition are identical with comparative example 1 and 2, comprise the following steps that：
First, Nd-Fe-B alloys are made using belt-rejecting technology, its composition proportion is 31.0%Nd,
65.7%Fe, 1.0%Co, 0.1%Cu, 0.1%Al, 0.1%Zr, 1.0%B；
Then, the alloy is carried out into the quick-fried treatment of hydrogen, and about 0.1% profit is added in the meal for obtaining
Lubrication prescription is simultaneously mixed；
Then, above meal is crushed with airflow milling, it is 3.0 μm to obtain powder particle mean size
Fine powder；
Then, the fine powder is carried out under the magnetic field of 1.9T orientation compressing；
Then, the blank after shaping is put into high vacuum sintering furnace, is sintered at being 1080 DEG C in temperature,
Ageing Treatment is carried out to blank at 900 DEG C and 500 DEG C respectively again；
Then, the magnet blank of acquisition is processed into the disk of Φ 20X4, with the dust technology pair that concentration is 3%
Disk is cleaned, the oil stain on removal disk product；
Then, carry out step A, with Plasma Rotation electrode method prepare Dy powder, powder globulate,
Average diameter size is 30 μm, and its pattern is as shown in Figure 2.
Then, step B is carried out, the objective table of coating produced by laser cladding mechanism will be put into after cleaned disk drying
Upper fixation, closing organ fire door, and vacuumize, after vacuum reaches more than 0.1, spray gun is controlled,
Ready-made Dy powders are uniformly sprayed onto product surface with the speed of 10g/min (gram every point), and
Control laser beam, by its uniform melt and is attached to product surface.Laser beam energy 2000W, diameter
2mm, laser scan rate is 3mm/s, and the thickness of product surface coating layer is 20 μm；
Then, carrying out step C, that the disk that six faces are uniformly coated with Dy powder is placed into another is true
In vacuum drying oven of the reciprocal of duty cycle higher than 1Pa, it is heat-treated at a temperature of 500~900 DEG C, is made Dy elements
Diffusion；
Then, carried out under the Ar gas that pressure is not higher than 0.07MPa it is air-cooled, cooling velocity be more than every point
20 DEG C of clock；
Finally, magnet sample is analyzed with ICP, obtains magnet composition as shown in table 2.
| Preparation technology | Br(kGs) | Hcj(kOe) | BHmax(MGOe) |
| Comparative example 1 (normally without Dy techniques) | 14.21 | 14.59 | 49.82 |
| Comparative example 2 (normal technique containing Dy) | 13.12 | 22.68 | 42.05 |
| Embodiment 3 (coating produced by laser cladding oozes Dy) | 14.07 | 22.85 | 48.76 |
| Preparation technology | Nd | Dy | B | Co | Cu | Al | Zr | Fe |
| Comparative example 1 (normally without Dy techniques) | 30.189 | 0.000 | 0.985 | 1.007 | 0.103 | 0.159 | 0.102 | 67.455 |
| Comparative example 2 (normal technique containing Dy) | 26.590 | 3.580 | 0.986 | 0.997 | 0.110 | 0.169 | 0.101 | 67.467 |
| Embodiment 3 (coating produced by laser cladding oozes Dy) | 30.012 | 0.105 | 0.993 | 1.013 | 0.098 | 0.176 | 0.105 | 67.498 |
Comparative example 2 is can be seen that except containing 3.580% Dy from the comparing of comparative example 2 and comparative example 1
Outside element, the content of remaining element is more or less the same compared with comparative example 1.By identical normal process,
The coercivity about 8kOe high of magnet material of the magnet material than the gained of comparative example 1 obtained by comparative example 2,
And remanent magnetism Br and maximum magnetic energy product BHmax are not remarkably decreased.Therefore comparative example 2 and comparative example 1
Compare and show, the use of Dy elements can significantly improve the coercivity of magnet.
From relatively can be seen that in the case where other conditions are substantially the same for embodiment 3 and comparative example 1,
Embodiment 3 permeates the magnet samples that are made of Dy by coating produced by laser cladding, with as constituent class by normal work
The magnet sample that skill is made is compared, and its remanent magnetism Br and maximum magnetic energy product BHmax are essentially identical, but coercive
Power Hcj is then higher by about 8kOe.Therefore embodiment 3 and comparative example 1 relatively show, using the present invention
Coating the method for Dy elements can significantly improve the coercivity of magnet.
From relatively can be seen that in the case where other conditions are substantially the same for embodiment 3 and comparative example 2,
The magnet sample obtained using coating produced by laser cladding of the invention infiltration Dy techniques is obtained with the normal process containing Dy
To magnet sample compare, its coercivity is higher by about 0.2kOe, and remanent magnetism Br is higher by about 930Gs, most
Big magnetic energy product BHmax is higher by about 6.7MGOe, but greatly reduces the content of heavy rare earth Dy (about
Comparative example 2 3%).Therefore embodiment 3 and comparative example 2 relatively show, using present invention coating
The method of Dy elements can greatly reduce the consumption of Dy elements.
In sum, be can be seen that in above instantiation is not influenceing the bar of remanent magnetism and maximum magnetic energy product
Under part, technical scheme proposed by the present invention has reached raising magnet material coercivity and has reduced heavy rare earth content
Technique effect.In addition, the coercivity R-T-B series permanent magnetic materials obtained by technical scheme proposed by the present invention,
Its remanent magnetism (Br) is more than 13.5kGs, and coercivity is more than 20.0kOe, and rare earth element Dy and/or Tb
Content be less than 0.5% (Dy elements are similar with the chemical property of Tb elements).
Above example is only exemplary embodiment of the invention, is not used in the limitation present invention, of the invention
Protection domain is defined by the claims.Those skilled in the art can be in essence of the invention and protection model
In enclosing, various modifications or equivalent are made to the present invention, this modification or equivalent also should be regarded as
Within the scope of the present invention.
Claims (10)
1. a kind of method for making high-coercive force R-T-B series permanent magnetic materials, it is characterised in that including with
Lower step：
Step A, prepares the spherical powder containing heavy rare earth element；
Step B, the R-T-B series permanent magnetic materials coating institute being made to normal process in coating produced by laser cladding mechanism
State the spherical powder containing heavy rare earth element.
2. the method for claim 1, it is characterised in that further comprising the steps of：
Step C, the R-T-B series permanent magnetic materials to having carried out coating produced by laser cladding are heat-treated.
3. the method for claim 1, it is characterised in that wherein step A is prepared and contained heavy rare earth
The method of the spherical powder of element is Plasma Rotation electrode method.
4. the method for claim 1, it is characterised in that the coating produced by laser cladding mechanism includes laser
Transmitter, vacuum cavity, powder playpipe and object carrying support, the object carrying support are used to fix the use
The R-T-B series permanent magnetic materials that normal process is made, the powder playpipe is used to use normal process to described
The R-T-B series permanent magnetic materials injection spherical powder containing heavy rare earth element being made, the Laser emission
Device is used to launch laser beam to powder eject position, and the spherical powder containing heavy rare earth element is heated to be
Then molten condition is ejected into the R-T-B series permanent magnetic materials surface being made of normal process.
5. the method as described in claim 1 or 4, it is characterised in that wherein described laser Fu Tu mechanisms
Laser energy be 1000~6000W, lasing beam diameter be 0.5~5mm, laser scan rate be 1~
20mm/s, coat thickness is 5~100 μm.
6. method as claimed in claim 4, it is characterised in that the speed of the powder playpipe is 1~
30g/min。
7. the method for claim 1, it is characterised in that be made of normal process to described
The painting thickness that covers of R-T-B series permanent magnetic materials is 5~100 μm.
8. method as claimed in claim 2, it is characterised in that to the institute for having carried out coating produced by laser cladding
It is in vacuum drying oven of the vacuum higher than 1Pa, to be heated to state R-T-B series permanent magnetic materials and be heat-treated
500~900 DEG C.
9. method as claimed in claim 2, it is characterised in that to having carried out described in coating produced by laser cladding
After R-T-B series permanent magnetic material blanks are heat-treated, enter under the Ar gas that pressure is not higher than 0.07MPa
Sector-style is cold, and cooling velocity is more than 20 DEG C per minute.
10. a kind of high-coercive force R-T-B series permanent magnetic materials, it is characterised in that its remanent magnetism (Br) is more than
13.5kGs, coercivity is more than 20.0kOe, and the content of rare earth element Dy and/or Tb is less than 0.5%.
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| CN110176349A (en) * | 2018-02-21 | 2019-08-27 | Tdk株式会社 | The processing method of rare-earth magnet |
| US20200005996A1 (en) * | 2018-06-29 | 2020-01-02 | Yantai Shougang Magnetic Materials, Inc. | Gradient nd-fe-b magnet and a method of production |
| CN110783099A (en) * | 2019-10-15 | 2020-02-11 | 江苏甬磁磁性材料研究院有限公司 | Surface coating method for improving coercive force of rare earth permanent magnet |
| CN111430142A (en) * | 2019-01-10 | 2020-07-17 | 中国科学院宁波材料技术与工程研究所 | Method for preparing neodymium iron boron magnet by grain boundary diffusion |
| CN112635188A (en) * | 2020-12-14 | 2021-04-09 | 电子科技大学 | Method and equipment for laser cladding of heavy rare earth wire on neodymium iron boron surface |
| EP3828905A1 (en) * | 2019-11-29 | 2021-06-02 | Yantai Shougang Magnetic Materials Inc. | A method for increasing the coercivity of a sintered type ndfeb permanent magnet |
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| CN110176349B (en) * | 2018-02-21 | 2021-06-01 | Tdk株式会社 | Method for processing rare earth magnet |
| US20200005996A1 (en) * | 2018-06-29 | 2020-01-02 | Yantai Shougang Magnetic Materials, Inc. | Gradient nd-fe-b magnet and a method of production |
| EP3591676A1 (en) * | 2018-06-29 | 2020-01-08 | Yantai Shougang Magnetic Materials Inc. | A gradient ndfeb magnet and the method of production |
| CN111430142A (en) * | 2019-01-10 | 2020-07-17 | 中国科学院宁波材料技术与工程研究所 | Method for preparing neodymium iron boron magnet by grain boundary diffusion |
| CN111430142B (en) * | 2019-01-10 | 2021-12-07 | 中国科学院宁波材料技术与工程研究所 | Method for preparing neodymium iron boron magnet by grain boundary diffusion |
| CN110783099A (en) * | 2019-10-15 | 2020-02-11 | 江苏甬磁磁性材料研究院有限公司 | Surface coating method for improving coercive force of rare earth permanent magnet |
| EP3828905A1 (en) * | 2019-11-29 | 2021-06-02 | Yantai Shougang Magnetic Materials Inc. | A method for increasing the coercivity of a sintered type ndfeb permanent magnet |
| CN112635188A (en) * | 2020-12-14 | 2021-04-09 | 电子科技大学 | Method and equipment for laser cladding of heavy rare earth wire on neodymium iron boron surface |
| CN112635188B (en) * | 2020-12-14 | 2021-10-08 | 电子科技大学 | Method and equipment for laser cladding of heavy rare earth wire on neodymium iron boron surface |
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