CN108538561A - A kind of Agglutinate neodymium-iron-boron magnet and preparation method - Google Patents
A kind of Agglutinate neodymium-iron-boron magnet and preparation method Download PDFInfo
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- CN108538561A CN108538561A CN201810172735.0A CN201810172735A CN108538561A CN 108538561 A CN108538561 A CN 108538561A CN 201810172735 A CN201810172735 A CN 201810172735A CN 108538561 A CN108538561 A CN 108538561A
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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
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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
- H01F1/0578—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 bonded together
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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
- H01F41/0266—Moulding; Pressing
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Abstract
The invention discloses a kind of Agglutinate neodymium-iron-boron magnet and preparation method, this programme dissolves fast feature according to molecule bonding agent powder, first mixes bonding agent powder and magnetic powder, then by solvent uniform atomizing spray on magnetic powder and adhesive particle；Magnetic powder surface is first modified by coupling agent during stirring in solvent, it is uniformly applied to magnetic powder surface with the dissolving binder of binder, the rubber powder binder and magnetic powder Dispersion on surface made in this way is uniform, binding force is strong between magnetic powder and magnetic powder, between magnetic powder and binder, and the rubber powder granule consistency after granulation can greatly improve well the consistency of powder flowbility and intensity.Since bonding agent does not have to be dissolved in solvent in advance, operating efficiency and the distributing precision of various composition are substantially increased.
Description
Technical field
The present invention relates to Agglutinate neodymium-iron-boron magnets, and in particular to prepares the preparation side of magnetic powder used in Agglutinate neodymium-iron-boron magnet
Method.
Background technology
Agglutinate neodymium-iron-boron magnet has good moldability, and dimensional accuracy is high, and magnetic property uniformity is good, and freedom shape is big, electricity
The features such as engine efficiency is high is widely used in electronic computer, household electrical appliance, office equipment, the fields such as automobile.
The preparation of usual Agglutinate neodymium-iron-boron magnet powder generally uses following processing step：
1, magnetic powder carries out granularity selection, and magnetic powder is crushed to the granularity of technique needs；
2, bonding agent and acetone are configured to solution according to a certain percentage in advance；
3, magnetic powder is added in mixing facilities to stir certain time and then binder solution is added in magnetic powder and continues to stir
It is configured to rubber powder；
4, the magnetic powder particle for being broken into the granularity of needs is carried out after colloid drying；
5,0.2-0.5% zinc stearates are mixed into rubber powder and finished powder is made.
In the specific implementation, it needs in advance to dissolve in acetone bonding agent with a container in step 2, course of dissolution needs
It stirs 2-5 hours, process for preparation binder is easy to stick on chamber wall and stirring rod, causes the misalignment of proportioning.
In step 3, can equally binder be caused to stick in hopper walls and stirring in the adding procedure of binder solution
Container inner wall causes binder proportioning to reduce, and adding procedure bonding agent is easy conglomeration and easily causes batch mixing non-uniform phenomenon；
Furthermore in step 3, bonding agent volatilization is added to from adhesive solution and becomes dry rubber powder to magnetic powder again, usually
It carries out at normal temperatures and pressures, solvent volatilization exclusion is slower, and when solvent volatilization is nearly completed, with solvent
It reduces, the stickiness of bonding agent and magnetic powder can be increasingly stronger, continues stirring and will produce a large amount of heat, and rubber powder is easy to form big at this time
The very strong magnetic powder group of stickiness of block, the later stage, which needs to be crushed again, can be only achieved technological requirement.
Due to the above problems, largely effecting on the production efficiency of powder processed, existing Agglutinate neodymium-iron-boron magnet powder is caused
The poor practicability of preparation process.
Invention content
For the low problem of existing Agglutinate neodymium-iron-boron magnet powder process efficiency, a kind of new Agglutinate neodymium-iron-boron is needed
Magnet scheme.
For this purpose, problem to be solved by this invention is to provide a kind of Agglutinate neodymium-iron-boron magnet, for the Agglutinate neodymium-iron-boron magnetic
Body also provides a kind of preparation method.
To solve the above-mentioned problems, a kind of Agglutinate neodymium-iron-boron magnet provided by the invention, includes the component of following parts by weight：
95~97 parts of NdFeB magnetic powder；
1.5~3 parts of thermosetting adhesive；
0.3~0.5 part of coupling agent；
0.1~0.5 part of lubricant.
Further, the thermosetting adhesive is bisphenol A type epoxy resin.
Further, the thermosetting adhesive is powdered thermosetting adhesive W-6C, the granularity of binder powder
>=200 mesh.
Further, the lubricant is zinc stearate or calcium stearate.
Further, the coupling agent is silane resin acceptor kh-550.
To solve the above-mentioned problems, the preparation method of a kind of Agglutinate neodymium-iron-boron magnet provided by the invention, including：
Thermosetting adhesive powder and NdFeB magnetic powder are mixed；
By solvent uniform atomizing spray on NdFeB magnetic powder and adhesive particle, idol during stirring in solvent
Magnetic powder surface is first modified by connection agent, as the dissolving binder of binder is uniformly applied to magnetic powder surface, forms rubber powder；
Rubber powder mix lubricant is uniform, obtain magnetic powder mixture；
Magnetic powder mixture is put into mold and suppress obtaining magnet green compact；
Magnet green compact are cured into 1~2.5h at 150~180 DEG C, obtain Agglutinate neodymium-iron-boron magnet.
Further, the granularity of the NdFeB magnetic powder is 120 mesh or more, wherein 150-250 mesh accounting 60-80%.
Further, in forming rubber powder step, thermosetting adhesive and magnetic powder are dry mixed, and stir 5-10min, until
Magnetic powder and binder are sufficiently mixed uniformly.
Further, in forming rubber powder step, acetone soln is dissolved in solvent acetone by coupling agent and is formed.
Further, in forming rubber powder step, acetone soln is sprayed at magnetic by spraying apparatus during stirring
On the mixture of powder and thermosetting adhesive.
Further, in forming rubber powder step, after acetone soln is added in magnetic powder and thermoset binder agent composition,
Equipment continues to stir 5-10min so that binder is completely dissolved in acetone soln and is fully soaked with magnetic powder particle surface molten.
Further, it in forming rubber powder step, is heated in whipping process, 35--40 DEG C of the temperature of heating, together
When to container vacuum-pumping, vacuum degree 0.08-0.10KPa.
Further, in forming rubber powder step, after the completion of acetone soln removes, into refrigerating state.
The Agglutinate neodymium-iron-boron magnet that the present invention program is provided, cementitiousness is strong, and density is high, good moldability, consistency
It is good；The preparation method for the Agglutinate neodymium-iron-boron magnet that the present invention program is provided simultaneously, can solve existing cohesive neodymium iron boron magnetic particle
There is a problem of being formulated in pulverizing process error is big and magnetic powder be kneaded after poor flow quality the problem of, product one can be effectively improved
Cause property improves production efficiency, reduces production cost.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below
Specific example is closed, the present invention is further explained.
After extensive and in-depth study, this programme is for the problems of existing Agglutinate neodymium-iron-boron magnet, by changing
Into formula, obtain that a kind of cementitiousness is strong, and density is high, good moldability, the good Agglutinate neodymium-iron-boron magnet of consistency.
The Agglutinate neodymium-iron-boron magnet is made up of the component of following parts by weight：
On this basis, following specific formula with synergy is further used：
Thermosetting adhesive in this programme uses bisphenol A type epoxy resin, in order to which the preparation conducive to this programme magnetic powder is excellent
Select powdered thermosetting adhesive W-6C, the mesh of the while granularity of binder powder >=200.
Matched, the preferred zinc stearate of lubricant in this programme or calcium stearate.
Matched, the preferred silane resin acceptor kh-550 of coupling agent in this programme.
For the Agglutinate neodymium-iron-boron magnet formed accordingly relative to existing Agglutinate neodymium-iron-boron magnet, cementitiousness is strong, density
Height, good moldability, consistency are good.
This programme dissolves fast spy when preparing the Agglutinate neodymium-iron-boron magnet of above-mentioned formula, according to molecule bonding agent powder
Point first mixes bonding agent powder and magnetic powder, then by solvent uniform atomizing spray on magnetic powder and adhesive particle；It is stirring
During coupling agent in solvent first magnetic powder surface is modified, be uniformly applied to magnetic powder table with the dissolving binder of binder
Face, the rubber powder binder and magnetic powder Dispersion on surface made in this way is uniform, between magnetic powder and magnetic powder, magnetic powder and binder it
Between binding force it is strong, the rubber powder granule consistency after granulation can greatly improve well the consistency of powder flowbility and intensity.Due to
Bonding agent does not have to be dissolved in solvent in advance, substantially increases operating efficiency and the distributing precision of various composition.
Principle accordingly, this programme prepare Agglutinate neodymium-iron-boron magnet as follows：
(1) required NdFeB magnetic powder was crushed >=120 mesh screens；
(2) by after sieving 95~97 parts of NdFeB magnetic powders and 1.5~3 parts of thermosetting adhesives (W-6C of such as powdery) plus
Enter in mixing facilities and stir evenly, then the 5-7 part acetone solns for adding 0.2~0.5 part of coupling agent is uniform by atomization plant
Rubber powder is made in the mixture surface for being sprayed onto magnetic powder and heat-curable adhesive；
(3) rubber powder and 0.1~0.5 part of mix lubricant obtained by step (2) is uniform, obtain magnetic powder mixture；
(4) magnetic powder mixture obtained by step (3) is put into mold and suppress obtaining magnet green compact；
(5) magnet green compact obtained by step (4) at 150~180 DEG C are cured into 1~2.5h, obtains Agglutinate neodymium-iron-boron magnet.
In this preparation process, in step (1), the broken granularity of NdFeB magnetic powder is 120 mesh or more, wherein 150-
250 mesh accounting 60-80%.Here by being crushed magnetic powder, optimize powder size, its mobility, the ability of filling pore can be increased
And the binding ability of magnetic powder and binder, it creates conditions to improve magnet briquettability.
Furthermore in this preparation process, step (2) is implemented as follows:
It is dry mixed by powdered bonding agent W-6C and magnetic powder, needs to stir 5-10min, ensure magnetic powder and bonding
Agent is sufficiently mixed uniformly；
Silane resin acceptor kh-550 is dissolved in solvent acetone and forms acetone soln；
After mixing, the acetone soln of formation is existed by spraying apparatus by magnetic powder and powdered bonding agent W-6C
It is sprayed at during stirring on the mixture of magnetic powder and powder adhesive.
After acetone soln is added in magnetic powder and powdered bonding agent W-6C mixtures, equipment continues to stir 5-
10min, it is ensured that binder is completely dissolved in acetone soln and is fully soaked with magnetic powder particle surface molten.
Continuing stirring rubber powder makes acetone effectively volatilize, and opens heating function in whipping process and add to stirring container
Heat, 35-40 DEG C of the temperature of heating, while giving container vacuum-pumping, vacuum degree 0.08-0.10KPa, it is possible thereby to effectively accelerate acetone
Volatilization improve milling efficiency.
Finally, rubber powder conglomeration is prevented in order to reduce the heat generated in rubber powder whipping process after the completion of solvent removes, opened
Refrigeration mode is opened, prevents bulky grain conglomeration magnetic powder from generating.
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In the following examples, the experimental methods for specific conditions are not specified, is usually marked according to country
Standard measures.If without corresponding national standard, built according to general international standard, normal condition or according to manufacturer
The condition of view carries out.
Unless otherwise defined or described herein, all professional and scientific terms used herein and the skilled people of art technology
Meaning is identical known to member.In addition any method and material similar or impartial to described content all can be applied to the present invention
In method.
Example 1
The Agglutinate neodymium-iron-boron magnet that this example is provided is made up of the component of following parts by weight：
95 parts of NdFeB magnetic powder；
W-6C1.5 parts of thermosetting adhesive；
0.3 part of silane resin acceptor kh-550；
0.1 part of zinc stearate.
And the granularity of the binder powder in this example is 250 mesh.
This example completes the preparation of Agglutinate neodymium-iron-boron magnet by following technique：
(1) required NdFeB magnetic powder was crushed 200 mesh screens；
(2) mixing facilities are added in the thermosetting adhesive W-6C of 95 parts of NdFeB magnetic powders and 1.5 parts of powderies after sieving
In stir evenly, then 5 parts of acetone solns for adding 0.2 part of coupling agent are uniformly sprayed onto magnetic powder and thermosetting property by atomization plant
Rubber powder is made in the mixture surface of bonding agent；
(3) gained rubber powder and 0.1 part of zinc stearate are uniformly mixed, obtain magnetic powder mixture；
(4) gained magnetic powder mixture is put into mold and suppress obtaining magnet green compact；
(5) gained magnet green compact are cured into 1h at 150 DEG C, obtains Agglutinate neodymium-iron-boron magnet.
In this example approach, rubber powder binder and magnetic powder Dispersion on surface are uniform, between magnetic powder and magnetic powder, magnetic powder and binder
Between binding force it is strong, the rubber powder granule consistency after granulation can greatly improve well the consistency of powder flowbility and intensity；Again
Person substantially increases operating efficiency and the distributing precision of various composition since bonding agent does not have to be dissolved in solvent in advance.
Example 2
The Agglutinate neodymium-iron-boron magnet that this example is provided is made up of the component of following parts by weight：
And the granularity of the binder powder in this example is 300 mesh.
This example completes the preparation of Agglutinate neodymium-iron-boron magnet by following technique：
(1) required NdFeB magnetic powder was crushed 300 mesh screens；
(2) the thermosetting adhesive W-6C of 96 parts of NdFeB magnetic powders and 2 parts of powderies after sieving is added in mixing facilities
It stirs evenly, then 6 parts of acetone solns for adding 0.4 part of coupling agent is uniformly sprayed onto magnetic powder by atomization plant and thermosetting property glues
Rubber powder is made in the mixture surface for connecing agent；
(3) gained rubber powder and 0.2 part of calcium stearate are closed uniformly, obtains magnetic powder mixture；
(4) gained magnetic powder mixture is put into mold and suppress obtaining magnet green compact；
(5) gained magnet green compact are cured into 2h at 160 DEG C, obtains Agglutinate neodymium-iron-boron magnet.
In this example approach, rubber powder binder and magnetic powder Dispersion on surface are uniform, between magnetic powder and magnetic powder, magnetic powder and binder
Between binding force it is strong, the rubber powder granule consistency after granulation can greatly improve well the consistency of powder flowbility and intensity；Again
Person substantially increases operating efficiency and the distributing precision of various composition since bonding agent does not have to be dissolved in solvent in advance.
Example 3
The Agglutinate neodymium-iron-boron magnet that this example is provided is made up of the component of following parts by weight：
And the granularity of the binder powder in this example is 300 mesh.
This example completes the preparation of Agglutinate neodymium-iron-boron magnet by following technique：
(1) required NdFeB magnetic powder was crushed 400 mesh screens；
(2) mixing facilities are added in the thermosetting adhesive W-6C of 97 parts of NdFeB magnetic powders and 2.5 parts of powderies after sieving
In stir evenly, then 7 parts of acetone solns for adding 0.5 part of coupling agent are uniformly sprayed onto magnetic powder and thermosetting property by atomization plant
Rubber powder is made in the mixture surface of bonding agent；
(3) gained rubber powder and 0.4 part of calcium stearate are closed uniformly, obtains magnetic powder mixture；
(4) gained magnetic powder mixture is put into mold and suppress obtaining magnet green compact；
(5) gained magnet green compact are cured into 2.5h at 180 DEG C, obtains Agglutinate neodymium-iron-boron magnet.
In this example approach, rubber powder binder and magnetic powder Dispersion on surface are uniform, between magnetic powder and magnetic powder, magnetic powder and binder
Between binding force it is strong, the rubber powder granule consistency after granulation can greatly improve well the consistency of powder flowbility and intensity；Again
Person substantially increases operating efficiency and the distributing precision of various composition since bonding agent does not have to be dissolved in solvent in advance.
Based on examples detailed above scheme, it may be determined that Agglutinate neodymium-iron-boron magnet provided by the invention and its preparation method, relatively
In the prior art, have the following advantages that：
1, the binder powder and magnetic powder of certain particle size are pre-mixed, the proportion speed of various substances, error is small；
2, starchy binder and magnetic powder are mixed and eliminates the process for dissolving binder in advance, improve production efficiency；
3, bonding agent dry powder is mixed directly into the container for not having to dissolving bonding agent in magnetic powder, save cleaning container and funnel
Link, it is most important that reduce environmental pollution；
4, then being added to coupling agent in solvent for novelty is sprayed by atomization plant to magnetic powder and bonding agent powder
Surface directly bonding agent and magnetic powder particle surface are modified, addition manner is simple and effective；
5, the addition of solvent is added by the way of spraying while stirring, and magnetic powder is made to be combined with bonding agent evenly, more directly
It connects, granulation time shortens, production efficiency higher.
6, solvent utilization rate is high in this way, saves solvent 1-2%.
7, granulation process is precisely controlled by heating and cooling down to rubber powder in granulation process, is made in this way
Grain, powder size is thin, and 80-90% is largely attained by the granularity of technological requirement, it is only necessary to broken to small part rubber powder to sieve again
Point, granulating powders are efficient.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (13)
1. a kind of Agglutinate neodymium-iron-boron magnet, which is characterized in that include the component of following parts by weight：
2. Agglutinate neodymium-iron-boron magnet according to claim 1, which is characterized in that the thermosetting adhesive is bisphenol-A class
Epoxy resin.
3. Agglutinate neodymium-iron-boron magnet according to claim 2, which is characterized in that the thermosetting adhesive is powdered
Thermosetting adhesive W-6C, the mesh of the granularity of binder powder >=200.
4. Agglutinate neodymium-iron-boron magnet according to claim 1, which is characterized in that the lubricant is for zinc stearate or firmly
Resin acid calcium.
5. Agglutinate neodymium-iron-boron magnet according to claim 1, which is characterized in that the coupling agent is silane coupling agent KH-
550。
6. a kind of preparation method of Agglutinate neodymium-iron-boron magnet, which is characterized in that include the following steps：
Thermosetting adhesive powder and NdFeB magnetic powder are mixed；
By solvent uniform atomizing spray on NdFeB magnetic powder and adhesive particle, coupling agent during stirring in solvent
First magnetic powder surface is modified, as the dissolving binder of binder is uniformly applied to magnetic powder surface, forms rubber powder；
Rubber powder mix lubricant is uniform, obtain magnetic powder mixture；
Magnetic powder mixture is put into mold and suppress obtaining magnet green compact；
Magnet green compact are cured into 1~2.5h at 150~180 DEG C, obtain Agglutinate neodymium-iron-boron magnet.
7. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that the NdFeB magnetic powder
Granularity is 120 mesh or more, wherein 150-250 mesh accounting 60-80%.
8. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, thermosetting adhesive and magnetic powder are dry mixed, and stir 5-10min, until magnetic powder and binder are sufficiently mixed uniformly.
9. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, acetone soln is dissolved in solvent acetone by coupling agent and is formed.
10. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, acetone soln is sprayed at during stirring by spraying apparatus on the mixture of magnetic powder and thermosetting adhesive.
11. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, after acetone soln is added in magnetic powder and thermoset binder agent composition, equipment continues to stir 5-10min so that binder
It is completely dissolved in acetone soln and is fully soaked with magnetic powder particle surface molten.
12. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, it is heated in whipping process, 35--40 DEG C of the temperature of heating, while giving container vacuum-pumping, vacuum degree 0.08-
0.10KPa。
13. the preparation method of Agglutinate neodymium-iron-boron magnet according to claim 6, which is characterized in that forming rubber powder step
In, after the completion of acetone soln removes, into refrigerating state.
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|---|---|---|---|---|
| CN111233453A (en) * | 2020-03-09 | 2020-06-05 | 绠＄兢 | Method for preparing dry-pressed anisotropic ferrite environment-friendly magnetic powder |
| CN113410019A (en) * | 2021-06-30 | 2021-09-17 | 安徽恒磁磁电有限公司 | Shock-resistant corrosion-resistant bonded neodymium iron boron magnet and preparation method thereof |
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Effective date of registration: 20190808 Address after: 239000 Xin'anjiang East Road 669, Suchu Modern Industrial Park, Chuzhou City, Anhui Province Applicant after: Magkun Magnetism Material (Chuzhou) Co., Ltd. Address before: 239000 No. 669, East Xin'An River Road, Anhui, Chuzhou Applicant before: Anhui AI Yi Magnet Technology Co., Ltd. |
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