CN110415964A - Anisotropy neodymium iron boron multi-pole magnet-ring preparation method - Google Patents
Anisotropy neodymium iron boron multi-pole magnet-ring preparation method Download PDFInfo
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- CN110415964A CN110415964A CN201910752869.4A CN201910752869A CN110415964A CN 110415964 A CN110415964 A CN 110415964A CN 201910752869 A CN201910752869 A CN 201910752869A CN 110415964 A CN110415964 A CN 110415964A
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- magnetic powder
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- neodymium iron
- iron boron
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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
- H01F1/0575—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
- H01F1/0576—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 pressed, e.g. hot working
-
- 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
- H01F41/026—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 protecting methods against environmental influences, e.g. oxygen, by surface treatment
-
- 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
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- 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
- H01F41/0273—Imparting anisotropy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
A kind of anisotropy neodymium iron boron multi-pole magnet-ring preparation method, this method comprises the following steps: a, several varigrained anisotropy NdFeB magnetic powder being taken to dispense and identify, then mixed in proportion, forms mixing magnetic powder；B, mixing magnetic powder is modified by silane coupling agent progress surface；C, the modified magnetic powder in surface is added binder and carries out vacuum kneading, then mixes with paraffin；D, pre-stamped to mixed magnetic powder, form preformed blank；E, preformed blank carries out multiple pulses multipole magnetic field orientation in oriented moulding compacting tool set, forms multiple magnetic poles of magnet ring, is then pressed into type；F, magnet ring after molding deviates from mold after demagnetization is handled in a mold, obtains anisotropy neodymium iron boron multi-pole magnet-ring blank；G, neodymium iron boron multi-pole magnet-ring blank is solidified under inert gas shielding in vacuum solidification furnace, then carries out immersion oil processing, obtain anisotropy neodymium iron boron multi-pole magnet-ring finished product.
Description
[technical field]
The present invention relates to magnet preparation methods, more particularly to a kind of anisotropy neodymium iron boron multi-pole magnet-ring preparation method.
[background technique]
Anisotropic bond neodymium iron boron is a kind of novel permanent magnetic material to grow up in recent years, compares sintered NdFeB material
Material, although its maximum magnetic energy product low 30~50%, because it is high with stock utilization, dimensional accuracy is high, the manufacturing cycle is short,
The advantages that easy to process, thus quickly grow in recent years.However, the preparation difficulty of anisotropic bond neodymium iron boron magnetic body is far super each
To same sex Agglutinate neodymium-iron-boron magnet, design and the compression moulding under magnetic field orientating that difficult point essentially consists in alignment magnetic field.
That there are formed product processes is complicated for the exploitation and industrialization of anisotropic bond neodymium iron boron multi-pole magnet at present,
Influence factor is more, and the magnet density of preparation is unevenly distributed, and the degree of orientation is poor, and orientation compacting process and demagnetization process production cycle are long,
The problem that low efficiency and magnet appearance coating are bad etc..
[summary of the invention]
Present invention seek to address that the above problem, and a kind of magnetic powder filling rate that can effectively improve magnet ring is provided, magnet ring orientation
Degree, magnet density, the inoxidizability and high-temperature stability of magnetic powder are easy to magnetic field orientating, and the maximum magnetic energy of magnet ring can be improved
Anisotropy neodymium iron boron multi-pole magnet-ring preparation method.
To achieve the above object, the present invention provides a kind of anisotropy neodymium iron boron multi-pole magnet-ring preparation method, this method packet
Include following steps:
A, it takes several varigrained anisotropy NdFeB magnetic powder to dispense and identify, then will dispense and identify each
Anisotropy magnetic powder mixes in proportion, forms mixing magnetic powder；
B, the mixing magnetic powder is modified by silane coupling agent progress surface；
C, the modified magnetic powder in surface is added binder and carries out vacuum kneading, then mixes with paraffin；
D, pre-stamped to being carried out with the mixed magnetic powder of paraffin, form preformed blank；
E, the preformed blank is placed in oriented moulding compacting tool set, to preforming under the action of big alignment magnetic field
Green body carries out multiple pulses multipole magnetic field orientation, forms multiple magnetic poles of magnet ring, alignment magnetic field direction it is vertical with pressure direction or
In parallel, it is then pressed into type；
F, magnet ring after molding deviates from mold after demagnetization is handled in a mold, obtains anisotropy neodymium iron boron multi-pole magnet-ring
Blank.
G, the neodymium iron boron multi-pole magnet-ring blank is solidified under inert gas shielding in vacuum solidification furnace, is then soaked
Antirust oil or electrophoresis or spray treatment obtain anisotropy neodymium iron boron multi-pole magnet-ring finished product.
In step b, it is modified that the silane coupling agent progress surface that weight percent is 0.5~1 is added in mixing magnetic powder.
In step c, surface-modified magnetic powder is mixed simultaneously with binder by the weight percent of 97~97.5:2.5-3.0
Vacuum kneading is carried out, the paraffin that weight percent is 0.1~0.2 is added in the magnetic powder after mixing and is mixed as lubricant.
In step c, the binder is thermosetting adhesive.
In step c, the binder is bisphenol A type epoxy resin.
In step d, the pre-stamped pressing pressure of mixing magnetic powder is 3.5~5T/cm2。
In step e, preformed blank is placed in oriented moulding compacting tool set, is heated to 140~160 DEG C of degree, and 0.7
Multiple pulses multipole magnetic field orientation is carried out to preformed blank under the action of the big alignment magnetic field of~1.5T, then 300~
The forming under the pressure of 500MPa, magnet ring after molding deviate from mold in a mold after demagnetization is handled, obtain anisotropy multipole neodymium
Iron boron magnet ring blank, wherein the direction of alignment magnetic field is vertical with pressure direction.
In step f, anisotropy neodymium iron boron multi-pole magnet-ring blank in vacuum solidification furnace under inert gas shielding 160~
Temperature-curable 1.5 hours of 200 DEG C of degree.
In step g, after the magnet ring blank leaching antirust oil or electrophoresis or spray treatment after solidification, anisotropy neodymium iron is obtained
Boron multi-pole magnet-ring finished product.
The inert gas is one of argon gas or nitrogen.
Contribution of the invention is, efficiently solves problems existing in the prior art.The present invention passes through to each
The granularity of anisotropy magnetic powder carries out preferably, not only contributing to obtain highdensity magnet ring, while can reduce anisotropy magnet ring and take
Minimum pressing pressure required for being suppressed to molding.The present invention is using paraffin as lubricant, and in hot pressing oriented moulding, viscosity is very
It is low, thus the frictional force between magnetic powder can be substantially reduced, for densification and orientation behavior of the magnetic powder in orientation pressing process
It is highly beneficial, and the magnetic powder filling rate and the magnet degree of orientation of magnet ring are improved, to obtain the magnet ring of high magnetic characteristics.The present invention
Surface is carried out by coupling agent to be modified, and oxygen, moisture in air etc. can be effectively prevented to the corrosiveness of magnetic powder, to mention
The high inoxidizability and high-temperature stability of magnetic powder.The present invention is formed by multistep molding method, convenient for magnetic powder filling and
Magnetic field orientating.The present invention by magnet ring blank after molding carry out vacuum state under leaching antirust oil, electrophoresis or spray treatment,
Significantly improve its antiseptic property and qualification rate.
[specific embodiment]
The following example is further explanation of the present invention, is not limited in any way to the present invention.
Anisotropy neodymium iron boron multi-pole magnet-ring preparation method of the invention includes the following steps:
One, the surface of anisotropy neodymium iron boron mixing magnetic powder is modified
To improve magnet ring performance, processing need to be modified to magnetic powder surface, in this method, in the mixing of anisotropy neodymium iron boron
It is modified that coupling agent progress surface is added in magnetic powder.In the present embodiment, the coupling agent is Silane coupling agent KH550, each to different
Property neodymium iron boron mixing magnetic powder in the silane coupling agent that weight percent is 0.7 is added, the silane coupling agent is molten using acetone as its
Agent helps to improve magnet ring performance so that coupling agent molecule comes into full contact with magnetic powder.Be added coupling agent after, coupling agent molecule with
It can be interconnected by combination reaction between anisotropy NdFeB magnetic powder and between coupling agent, form Si-O-Si
The network structure of key, coupling agent finally form one layer of netted film on magnetic powder surface in a manner of chemisorption, can be effective
Prevent oxygen, moisture in air etc. to the corrosiveness of magnetic powder, to improve the inoxidizability and high-temperature stable of magnetic powder
Property.Specifically, first coupling agent is dissolved in and obtains solution in acetone, then solution is added in magnetic powder container and impregnates 9 hours, then
Stirring to acetone volatilizees, that is, obtains modified anisotropy NdFeB magnetic powder.
Two, the vacuum kneading of anisotropy neodymium iron boron mixing magnetic powder
Surface-modified anisotropy NdFeB magnetic powder is mixed with binder by the weight percent of 97.25:2.75, so
It is placed in vacuum drying oven and carries out vacuum kneading.Wherein, the binder is thermosetting adhesive, preferably powdered thermosetting property
Binder.In this implementation, the thermosetting adhesive is bisphenol A type epoxy resin, and the granularity of binder powder answers >=200 mesh.
The paraffin that weight percent is 0.15 is added in magnetic powder after mixing to be mixed as lubricant, since melting point of paraffin wax is 50
DEG C degree, be low melting point lubricant, in a molten state in hot pressing oriented moulding, viscosity is very low, thus greatly reduces magnetic
Frictional force between powder, this is highly beneficial in the densification and orientation behavior being orientated in pressing process for magnetic powder, can be improved
The magnetic powder filling rate and the magnet degree of orientation of anisotropy magnetic Nd-Fe-B ring, and can get the magnet ring of high magnetic characteristics.
Three, anisotropy magnetic Nd-Fe-B ring is preforming
It is pre-stamped to being carried out with the mixed magnetic powder of paraffin, form preformed blank.This step is that magnetic powder is placed in mold
In be pressed into the green body of certain shapes.In the present embodiment, the pre-stamped pressing pressure of mixing magnetic powder is 4T/cm2, i.e., every square li
4 tons of rice.Blank strength in pre-stamped is unsuitable excessively high, and excessively high blank strength can hinder during reheating oriented moulding
Powder turns to.
Four, the compression moulding of anisotropy magnetic Nd-Fe-B ring
Preformed blank is placed in oriented moulding compacting tool set, which can be well known mould
Tool is heated to 150 DEG C of degree, then applies alignment magnetic field in a mold, under the action of magnetic field strength is the big alignment magnetic field of 1T
4 subpulse multipole magnetic fields orientation is carried out to preformed blank, forms multiple magnetic poles of magnet ring, wherein the direction of alignment magnetic field and pressure
Power direction is perpendicular or parallel.Then in the forming under the pressure of 400MPa and pressure is kept 13 seconds.Magnet ring after molding is in a mold
It is demagnetized by applying opposing magnetic field, deviates from mold after demagnetization processing, obtain anisotropy multipole magnetic Nd-Fe-B ring blank.
Five, the vacuum solidification of neodymium iron boron multi-pole magnet-ring blank
Anisotropy neodymium iron boron multi-pole magnet-ring blank is placed in vacuum drying oven, the temperature spent under protection of argon gas at 160 DEG C
Solidification 1.5 hours.It can prevent magnet ring surface oxidation when being heating and curing from reducing its magnetism by vacuum drying oven solidification.Comparative test
It proves, spend at 160 DEG C of solidification temperature, under the conditions of nitrogen protection, the maximum magnetic energy product of magnet improves 10% or so compared with batch-type furnace.
After the completion of vacuum solidification, preservative treatment is carried out to the magnet ring blank after vacuum solidification, which is by magnet ring
Blank soaks antirust oil under vacuum conditions.Specifically, leaching antirust oil processing be by magnet ring blank vacuum degree be 0.012MPa
It is impregnated 3 minutes in antirust oil, then drains and dry again within 1 hour 2 hours.Since by magnet ring blank, immersion oil is in negative pressure in a vacuum
Middle immersion enables antirust oil fully penetrated to magnet ring blank surface, is remarkably improved antiseptic property and qualification rate.At immersion oil
After reason, anisotropy neodymium iron boron multi-pole magnet-ring finished product is obtained.
Take this, the present invention is preferred by anisotropy neodymium-iron-boron Powder Particle Size and magnet ring density can be improved in mixing, while can
Reduce minimum pressing pressure required for magnet ring oriented moulding is suppressed.By the modified inoxidizability that magnetic powder can be improved in surface and
High-temperature stability.The magnetic powder filling rate and the magnet degree of orientation of magnet ring can be improved by vacuum kneading, and can get high magnetic characteristics
Magnet ring.By to anisotropy magnetic Nd-Fe-B ring is pre-stamped and the multistep molding method of compression moulding be conducive to magnetic powder filling and
Magnetic field orientating.The magnetic energy product and antiseptic property and qualification rate of magnet can be improved in vacuum solidification and preservative treatment.
Although being disclosed by above embodiments to the present invention, scope of protection of the present invention is not limited thereto,
Under conditions of without departing from present inventive concept, deformation, the replacement etc. done to above each component will fall into right of the invention
In claimed range.
Claims (10)
1. a kind of anisotropy neodymium iron boron multi-pole magnet-ring preparation method, which is characterized in that this method comprises the following steps:
A, it takes several varigrained anisotropy NdFeB magnetic powder to dispense and identify, then will dispense and identifies each to different
Property magnetic powder mix in proportion, formed mixing magnetic powder；
B, the mixing magnetic powder is modified by silane coupling agent progress surface；
C, the modified magnetic powder in surface is added binder and carries out vacuum kneading, then mixes with paraffin；
D, pre-stamped to being carried out with the mixed magnetic powder of paraffin, form preformed blank；
E, the preformed blank is placed in oriented moulding compacting tool set, to preformed blank under the action of big alignment magnetic field
Multiple pulses multipole magnetic field orientation is carried out, multiple magnetic poles of magnet ring are formed, alignment magnetic field direction and pressure direction are perpendicular or parallel,
It is then pressed into type；
F, magnet ring after molding deviates from mold after demagnetization is handled in a mold, obtains anisotropy neodymium iron boron multi-pole magnet-ring hair
Base.
G, the neodymium iron boron multi-pole magnet-ring blank is solidified under inert gas shielding in vacuum solidification furnace, then carries out leaching antirust
Oil or electrophoresis or spray treatment obtain anisotropy neodymium iron boron multi-pole magnet-ring finished product.
2. the method as described in claim 1, which is characterized in that in step b, weight percent, which is added, in mixing magnetic powder is
It is modified that 0.5~1 silane coupling agent carries out surface.
3. the method as described in claim 1, which is characterized in that in step c, surface-modified magnetic powder and binder by 97~
The weight percent of 97.5:2.5-3.0 mixes and carries out vacuum kneading, and it is 0.1 that weight percent is added in the magnetic powder after mixing
~0.2 paraffin is mixed as lubricant.
4. method as claimed in claim 4, which is characterized in that in step c, the binder is thermosetting adhesive.
5. method as claimed in claim 5, which is characterized in that in step c, the binder is bisphenol A type epoxy resin.
6. the method as described in claim 1, which is characterized in that in step d, the pre-stamped pressing pressure of mixing magnetic powder is 3.5
~5T/cm2。
7. the method as described in claim 1, which is characterized in that in step e, preformed blank is placed in oriented moulding pressing die
In tool, 140~160 DEG C of degree are heated to, and carry out repeatedly under the action of the big alignment magnetic field of 0.7~1.5T to preformed blank
Pulse multipole magnetic field orientation, then in the forming under the pressure of 300~500MPa, magnet ring after molding is in a mold after demagnetization processing
Deviate from mold, obtains anisotropy multipole magnetic Nd-Fe-B ring blank, wherein the direction of alignment magnetic field is vertical with pressure direction.
8. the method as described in claim 1, which is characterized in that in step f, anisotropy neodymium iron boron multi-pole magnet-ring blank is true
160~200 DEG C of temperature-curable 1.5 hours spent under inert gas shielding in empty curing oven.
9. the method as described in claim 1, which is characterized in that magnet ring blank leaching antirust oil or electricity in step g, after solidification
After swimming or spray treatment, anisotropy neodymium iron boron multi-pole magnet-ring finished product is obtained.
10. method as claimed in claim 1 or 8, which is characterized in that the inert gas is one of argon gas or nitrogen.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983395A (en) * | 2019-12-17 | 2020-04-10 | 广东小天才科技有限公司 | Magnet, preparation method and wearable device |
| CN111489889A (en) * | 2020-04-26 | 2020-08-04 | 浙江凯文磁业有限公司 | Preparation method of high-homogeneity high-performance rare earth permanent magnet |
| CN112086259A (en) * | 2020-09-11 | 2020-12-15 | 中钢集团南京新材料研究院有限公司 | Anisotropic inner circle orientation multi-pole magnetic ring and die and preparation method thereof |
| EP3834961A1 (en) | 2019-12-13 | 2021-06-16 | Yantai Shougang Magnetic Materials Inc. | A radiation-oriented sintered arc-shaped nd-fe-b magnet, a manufacturing method thereof, and a corresponding manufacturing device |
| CN113077983A (en) * | 2021-04-09 | 2021-07-06 | 杭州千石科技有限公司 | Preparation method of injection molding C-shaped magnetic ring for wireless charging |
| CN113948303A (en) * | 2021-10-20 | 2022-01-18 | 合肥工业大学 | High-yield and high-performance sintered NdFeB radiation ring and preparation method thereof |
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| EP3834961A1 (en) | 2019-12-13 | 2021-06-16 | Yantai Shougang Magnetic Materials Inc. | A radiation-oriented sintered arc-shaped nd-fe-b magnet, a manufacturing method thereof, and a corresponding manufacturing device |
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| CN113948303A (en) * | 2021-10-20 | 2022-01-18 | 合肥工业大学 | High-yield and high-performance sintered NdFeB radiation ring and preparation method thereof |
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