CN110304914A - A kind of isotropism permanent-magnet ferrite and its preparation method and application - Google Patents
A kind of isotropism permanent-magnet ferrite and its preparation method and application Download PDFInfo
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- CN110304914A CN110304914A CN201910670405.9A CN201910670405A CN110304914A CN 110304914 A CN110304914 A CN 110304914A CN 201910670405 A CN201910670405 A CN 201910670405A CN 110304914 A CN110304914 A CN 110304914A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2641—Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, alkaline earth metals or lead
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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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
- H01F1/03—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
- H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/661—Multi-step sintering
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Abstract
The invention belongs to permanent-magnet ferrite technical fields, and in particular to a kind of isotropism permanent-magnet ferrite and its preparation method and application.The present invention provides a kind of isotropism permanent-magnet ferrites, including SrO, Fe2O3、La2O3And Co2O3, the SrO and Fe2O3Molar ratio be 1:(5.3~5.5)；Preparation method, comprising the following steps: by SrCo3And Fe2O3Mixing carries out pre-burning, obtains Preburning material；By Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball milling material；Ball milling material and poly-vinyl alcohol solution are mixed, is successively granulated, formed and sintering processes, obtain isotropism permanent-magnet ferrite.The obtained isotropism permanent-magnet ferrite of the present invention, which has, is subjected to after high temperature and low-temperature impact that change rate is small compared with anisotropy magnet, is subjected to the small feature of mechanical, vibration, stray magnetic field interference variations rate, has excellent magnetic property.
Description
Technical field
The invention belongs to permanent-magnet ferrite technical fields, and in particular to a kind of isotropism permanent-magnet ferrite and its preparation side
Method and application.
Background technique
Permanent-magnet ferrite is to can produce the functional material in magnetic field using SrO or BaO and di-iron trioxide as raw material, as
One important component of magnetic material, permanent-magnet ferrite electronics industry, information industry, motorcycle, Power Tools Industries,
The industries such as auto industry play an important role.Permanent-magnet ferrite, i.e. hexgonal screw mainly have two major classes type, a kind of
It is its direction of easy axis is hexagonal C axis direction, referred to as spindle-type, another kind of is that its direction of easy axis is in perpendicular to the flat of C axis
In face, referred to as plane；What is fallen between is conical-surface type, and direction of easy axis is in a circular conical surface.
Permanently magnetic strontium ferrite, barium ferrite owner's spindle-type permanent-magnet ferrite.In spindle-type permanent-magnet ferrite, work as easy magnetization
The permanent-magnet ferrite that direction C axis all arranges at same direction is known as anisotropic permanent magnetic ferrite, when direction of easy axis C axis is pressed
Natural way arbitrary arrangement is known as isotropism permanent-magnet ferrite.Isotropism permanent-magnet ferrite and anisotropy permanent magnet oxygen
Body compares, and has series of advantages, and under low temperature, demagnetization is few, and change rate is small, and temperature stability is good；Be impacted, shaken,
Under the influence of especially extraneous stray magnetic field, magnet variation is small；After magnetizing for a long time, do not demagnetize substantially；It can be after magnet magnetized
Assembly or assembly back magnetization；Demagnetizing curve is straight line, when Magnet working point is more than inflection point, is subjected to demagnetization influence and temperature
Afterwards, magnetic property can automatically restore to normal condition etc..
But magnetic property changes greatly and is subjected to after current isotropism permanent-magnet ferrite is subjected to high temperature and low-temperature impact
The big disadvantage of mechanical, vibration, stray magnetic field interference variations rate, in door of refrigerator strip of paper used for sealing, video recorder motor, thermostat, electric magnetic card
The application of the devices such as disk, oil filter, keeper is above restricted, and hinders the application of isotropism permanent-magnet ferrite.
Summary of the invention
In view of this, making institute the purpose of the present invention is to provide a kind of isotropism permanent-magnet ferrite and preparation method thereof
Obtained isotropism permanent-magnet ferrite, which has, is subjected to after high temperature and low-temperature impact that change rate is small compared with anisotropy magnet, warp
By the small feature of mechanical, vibration, stray magnetic field interference variations rate, guarantee permanent-magnet ferrite using effect；The present invention also provides
A kind of application of isotropism permanent-magnet ferrite.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
The present invention provides a kind of isotropism permanent-magnet ferrite, the isotropism permanent-magnet ferrite include SrO,
Fe2O3、La2O3And Co2O3, the SrO and Fe2O3Molar ratio be 1:(5.3~5.5).
The present invention also provides the preparation methods of isotropism permanent-magnet ferrite described in above-mentioned technical proposal, including following step
It is rapid:
By SrCo3And Fe2O3Mixing carries out pre-burning, obtains Preburning material；
By the Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball milling material；
The ball milling material and poly-vinyl alcohol solution are mixed, is successively granulated, formed and sintering processes, obtained each to same
Property permanent-magnet ferrite.
Preferably, the temperature of the pre-burning is 1180~1220 DEG C, and the time is 2~3h.
Preferably, the La2O3Additive amount be Preburning material quality 2~3%；The Co2O3Additive amount be Preburning material
The 1~2% of quality.
Preferably, the mass concentration of the poly-vinyl alcohol solution is 8~10%；The additive amount of the poly-vinyl alcohol solution is
The 5~8% of Preburning material quality.
It preferably, before granulation processing further include the compacting successively carried out and broken.
Preferably, the mode of the forming processes is compacting；The density of the compacting resulting material is 3.2~3.4g/
cm3。
Preferably, the temperature of the sintering processes is 1180~1220 DEG C, and the time is 1~2h.
Preferably, the Preburning material and La2O3And Co2O3It further include that the Preburning material is subjected to coarse crushing processing before mixing.
The present invention also provides the isotropism permanent-magnet ferrite described in above-mentioned technical proposal or by above-mentioned technical proposal institute
Isotropism permanent-magnet ferrite that preparation method obtains is stated in the application of electronic field and machinery field.
The present invention provides a kind of isotropism permanent-magnet ferrites, including SrO, Fe2O3、La2O3And Co2O3, the SrO and
Fe2O3Molar ratio be 1:(5.3~5.5).The present invention uses low iron formula, prevents Fe supply to coercitive adverse effect；It is logical
Addition La and Co element is crossed, to improve the magnetic property of permanent-magnet ferrite.
The present invention also provides a kind of preparation methods of isotropism permanent-magnet ferrite, first by SrCo3And Fe2O3Mixing,
Pre-burning is carried out, Preburning material is obtained, then by Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball milling material, most
Ball milling material and poly-vinyl alcohol solution are mixed afterwards, is successively granulated, formed and sintering processes, obtain isotropism permanent magnet oxygen
Body.The present invention is by pre-burning process, while substantially meeting generation ferrite crystal grains, keeps more relaxing in lattice, favorably
In the ion exchange of subsequent handling La, Co, increase the conversion of La, Co ionic weight；Enter lattice with a certain amount of La, Co, to improve permanent magnetism
Ferritic magnetic property；The addition of polyvinyl alcohol keeps loose ferrite powder stick agglomerating, is conducive to increase blank density, warp
It is granulated, forming processes, can further improve iron oxygen permanent magnet green density, the higher iron oxygen permanent magnetism of remanent magnetism is obtained after green sintering
Body.
The experimental results showed that isotropism iron oxygen permanent magnet residual magnetism Br of the present invention reaches 250mT, magnetic strength coercivity H b
405kA/m, maximum magnetic energy product (BH) are reached up to 167kA/m, intrinsic coercivity HjcmaxUp to 10.7kJ/m3, there is excellent magnetism
Energy.
Detailed description of the invention
Fig. 1 is the isotropism iron oxygen permanent magnet product photo that the embodiment of the present invention 1 is prepared.
Specific embodiment
The present invention provides a kind of isotropism permanent-magnet ferrite, the isotropism permanent-magnet ferrite include SrO,
Fe2O3、La2O3And Co2O3, the SrO and Fe2O3Molar ratio be 1:(5.3~5.5).
In the present invention, the SrO and Fe2O3Molar ratio be 1:(5.3~5.5), preferably 1:(5.35~5.45).
The present invention also provides the preparation methods of isotropism iron oxygen permanent magnet described in above-mentioned technical proposal, including following step
It is rapid:
By SrCo3And Fe2O3Mixing carries out pre-burning, obtains Preburning material；
By Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball milling material；
Ball milling material and poly-vinyl alcohol solution are mixed, is successively granulated, formed and sintering processes, obtain isotropism forever
Magnetic ferrites.
In the present invention, if without specified otherwise, all raw materials for preparing of the present invention are well known to those skilled in the art
Commercial goods.
The present invention is by SrCo3And Fe2O3Mixing carries out pre-burning, obtains Preburning material.In the present invention, the SrCo3With
Fe2O3Molar ratio be preferably 1:(5.3~5.5), more preferably 1:(5.35~5.45).In the present invention, the SrCo3Meeting
It decomposes and generates SrO, by SrCo3It is high to decompose the SrO reactivity generated, is conducive to the preparation of isotropism permanent-magnet ferrite.?
In the present invention, the mixing SrCo3And Fe2O3Equipment preferably mixed machine by force.The present invention does not have the hybrid parameter of the strong mixed machine
There is particular determination, using hybrid parameter well known to those skilled in the art.In the present invention, the temperature of the pre-burning is preferred
It is 1180~1220 DEG C, more preferably 1190~1210 DEG C；The time of the pre-burning is preferably 2~3h, more preferably 2~
2.5h.In the present invention, the equipment of the pre-burning is preferably rotary kiln, tunnel oven or electrical kiln.The present invention passes through pre-burning work
Sequence keeps more relaxing in lattice, is conducive to subsequent handling La, Co ion while substantially meeting generation ferrite crystal grains
Displacement increases La, Co ion exchange amount, and then is conducive to enter lattice with a certain amount of La, Co, to improve the magnetic of permanent-magnet ferrite
Performance.The present invention is before the pre-burning, preferably by SrCo3And Fe2O3Honeycomb is made in obtained mixed material, in favor of pre-
Burn the thorough of processing.
After obtaining Preburning material, the present invention is by the Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball
Abrasive material.In the present invention, the La2O3Additive amount be preferably the 2~3% of Preburning material quality, more preferably 2.2~2.8%.
In the present invention, the Co2O3Additive amount be preferably the 1~2% of Preburning material quality, more preferably 1.2~1.8%.The present invention
The mixing is not particularly limited, using hybrid mode well known to those skilled in the art.In the present invention, the ball
Mill is preferably wet ball grinding.In the present invention, the ball-milling medium of the ball milling is preferably water, and the ball material-water ratio of the ball milling is preferred
For 9:1:1.2.In the present invention, the obtained ball abrasive size after the ball milling is preferably 0.8~1 μm.
In the present invention, it before the ball-milling treatment, preferably includes the Preburning material is cooling；The mode of the cooling is preferred
It is cooling with kiln.
In the present invention, the Preburning material and La2O3And Co2O3It is also preferable to include Preburning material is carried out coarse crushing before mixing
Processing.In the present invention, the coarse crushing partial size is preferably 6 μm.The present invention does not have particular/special requirement to the equipment of the coarse crushing,
It is specific such as jaw crusher or dry ball can be realized coarse crushing partial size purpose.
After obtaining ball milling material, the present invention mixes the ball milling material and poly-vinyl alcohol solution, be successively granulated, form and
Sintering processes obtain isotropism permanent-magnet ferrite.In the present invention, the mass concentration of the poly-vinyl alcohol solution is preferably 8
~10%, more preferably 8.5~10%, further preferably 9~10%.In the present invention, the poly-vinyl alcohol solution adds
Dosage is preferably the 5~8% of Preburning material quality, more preferably 5.5~7.5%, further preferably 6~7%.The present invention is to institute
It states mixing to be not particularly limited, using hybrid mode well known to those skilled in the art.The present invention by the ball milling material and
Granulation processing is carried out after poly-vinyl alcohol solution mixing, obtains pellet.In the present invention, the equipment of the granulation is preferably vibrated
Sieve, more preferably 80 mesh vibrating screens.
In the present invention, it is also preferable to include do the ball milling material before the ball milling material and poly-vinyl alcohol solution mixing
Dry processing.In the present invention, the equipment of the drying is preferably dryer.In the present invention, the degree of drying preferably makes
Ball milling material moisture content≤0.5%.
In the present invention, it is also preferable to include the compactings and break process that successively carry out before the granulation processing.The present invention couple
The equipment of the compacting does not have particular/special requirement, uses press device well known to those skilled in the art.In the present invention, institute
State compacting resulting material density preferably >=3.0g/cm3.In the present invention, the particle size after cracking preferably≤3mm.
After obtaining pellet, the pellet is carried out forming processes by the present invention, obtains green compact.In the present invention, the molding
The mode of processing is preferably suppressed.In the present invention, the equipment of the compacting is preferably automatic hydraulic press.In the present invention, institute
The density for stating green compact is preferably 3.2~3.4g/cm3.The present invention meets product design size or shape by pressing process, acquisition
Green compact.
After obtaining green compact, the green compact are sintered by the present invention, obtain isotropism permanent-magnet ferrite.In this hair
In bright, the temperature of the sintering is preferably 1180~1220 DEG C, and more preferably 1190~1210 DEG C；The time of the sintering is preferred
For 1~2h, more preferably 1~1.5h.
After sintering, the present invention is ground to user's desired size preferably by sintered product furnace cooling, for actually answering
With.
The present invention also provides isotropism permanent-magnet ferrites described in above-mentioned technical proposal in electronic field and machinery field
Application.The isotropism permanent-magnet ferrite is preferably applied to video recorder motor, thermostat, magnechuck, electricity by the present invention
The devices such as seal strip for refrigerator door, oil filter or keeper.
In order to further illustrate the present invention, below with reference to embodiment to isotropism permanent-magnet ferrite provided by the invention and
Preparation method and application are described in detail, but they cannot be interpreted as limiting the scope of the present invention.Obviously,
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The scope of protection of the invention.
Embodiment 1
98.5%Fe is greater than using purity2O3It is greater than 97%SrCo with purity3(press SrO5.5Fe2O3Conversion) matched
Material, with SrCo3And Fe2O3Total amount 1000kg is calculated, by SrCo3And Fe2O3After ingredient, 50min is mixed in strong mixed machine, by ingredient
Mixture, which is made after honeycomb cake in Natural Gas Fueled Tunnel Kiln under the conditions of 1200 DEG C, keeps the temperature 2h progress pre-burning, then cooling with kiln
Ferrite is generated, subsequently after jaw crusher is broken, using wet ball mill wet-milling, while the La of 2.5wt% is added2O3
With the Co of 1.3wt%2O3, discharge after being milled to 1 μm.Using drying machine drying to water content 0.5% hereinafter, addition 7% gathers
Glycohol solution (mass concentration 10%) is uniformly mixed, is pressed into block cake (density 3g/cm on a hydraulic press3), through broken
Crusher machine to line footpath is less than 3mm particle, is added and vibrates sieved 80 mesh vibrating prillings, then is pressed on a hydraulic press by user's requirement
Product green compact finally keep the temperature 1h under the conditions of 1200 DEG C using electrical tunnel oven, obtain isotropism permanent-magnet ferrite；It will obtain
Isotropism permanent-magnet ferrite grind be worked into dimensional tolerance as required, after verification test, qualified product storage.
Using permanent magnetism ability meter, magnetic property survey is carried out to the isotropism permanent-magnet ferrite that embodiment 1 is prepared
Examination, after tested, 1 gained isotropism permanent magnetic ferrite residual magnetization Br of embodiment reach 250mT, and magnetic strength coercivity H b reaches 167kA/m,
Intrinsic coercivity Hjc reaches 405kA/m, maximum magnetic energy product (BH)maxUp to 10.7kJ/m3, there is excellent magnetic property.
The magnetic property of isotropism permanent-magnet ferrite, existing isotropism permanent-magnet ferrite that embodiment 1 is prepared
It is compared with China-styled Certain Industry Field standard, existing isotropism permanent-magnet ferrite source (company and the trade mark) and comparison result are shown in Table 1.
1 embodiment 1 of table and existing isotropism permanent-magnet ferrite comparison of magnetic property result
| Br(mT) | Hcj(KA/m) | Hcb(KA/m) | (BH)max(KJ/m3) | |
| Embodiment 1 | 250 | 167 | 405 | 10.7 |
| Japanese TDK:FB1A | 220±15 | 159.±15.9 | 258.6±19.9 | 8.9±1.6 |
| Hitachi, Japan: NMF-DB | 200~230 | 127~159 | ≥254 | 6.3~6.7 |
| The South Korea Pacific Ocean: PMFB-120 | 200~230 | 135~159 | 278~310 | 7.1~9.6 |
| China-styled Certain Industry Field standard Y8T | 200~235 | 125~160 | 210~280 | 6.5~9.5 |
Seen from table 1, isotropism permanent-magnet ferrite provided by the invention and existing commercial permanent-magnet ferrite and China
Professional standard is compared, and magnetic property is significantly increased.
Isotropism permanent-magnet ferrite provided by the invention has higher coercivity and biggish remanent magnetism, is largely tested,
Isotropism permanent magnetic ferrite residual magnetization Br provided by the invention is 250 ± 10mT, and magnetic strength coercivity H b is 167 ± 11.9kA/m,
Intrinsic coercivity Hjc is 405 ± 11.9kA/m, maximum magnetic energy product (BH)maxFor 10.7 ± 1.6kJ/m3, after 100 DEG C of storage 2h most
Big magnetic energy product (BH)maxIt is small, anti-dry to be subjected to after high temperature and low-temperature impact the change rate compared with anisotropy magnet for change rate≤8%
It is strong to disturb ability, ensure that isotropism permanent-magnet ferrite using effect, be conducive to the application of isotropism permanent-magnet ferrite, have
High scientific research and commercial value.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of isotropism permanent-magnet ferrite, which is characterized in that the isotropism permanent-magnet ferrite includes SrO, Fe2O3、
La2O3And Co2O3, the SrO and Fe2O3Molar ratio be 1:(5.3~5.5).
2. the preparation method of isotropism permanent-magnet ferrite described in claim 1, which comprises the following steps:
By SrCo3And Fe2O3Mixing carries out pre-burning, obtains Preburning material；
By the Preburning material and La2O3And Co2O3Mixing carries out ball-milling treatment, obtains ball milling material；
The ball milling material and poly-vinyl alcohol solution are mixed, is successively granulated, formed and sintering processes, obtain isotropism forever
Magnetic ferrites.
3. preparation method according to claim 2, which is characterized in that the temperature of the pre-burning is 1180~1220 DEG C, when
Between be 2~3h.
4. preparation method according to claim 2, which is characterized in that the La2O3Additive amount be Preburning material quality 2
~3%；The Co2O3Additive amount be Preburning material quality 1~2%.
5. preparation method according to claim 2, which is characterized in that the mass concentration of the poly-vinyl alcohol solution be 8~
10%；The additive amount of the poly-vinyl alcohol solution is the 5~8% of Preburning material quality.
6. preparation method according to claim 2, which is characterized in that further include the pressure successively carried out before the granulation processing
It makes and broken.
7. preparation method according to claim 2, which is characterized in that the mode of the forming processes is compacting；The pressure
The density of resulting material processed is 3.2~3.4g/cm3。
8. preparation method according to claim 2, which is characterized in that the temperature of the sintering processes is 1180~1220
DEG C, the time is 1~2h.
9. preparation method according to claim 2, which is characterized in that the Preburning material and La2O3And Co2O3It is also wrapped before mixing
It includes and the Preburning material is subjected to coarse crushing processing.
10. isotropism permanent-magnet ferrite described in claim 1 is obtained by any one of claim 2~9 preparation method
Isotropism permanent-magnet ferrite electronic field and machinery field application.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910670405.9A CN110304914A (en) | 2019-07-24 | 2019-07-24 | A kind of isotropism permanent-magnet ferrite and its preparation method and application |
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| CN201910670405.9A CN110304914A (en) | 2019-07-24 | 2019-07-24 | A kind of isotropism permanent-magnet ferrite and its preparation method and application |
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| CN201910670405.9A Pending CN110304914A (en) | 2019-07-24 | 2019-07-24 | A kind of isotropism permanent-magnet ferrite and its preparation method and application |
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Cited By (2)
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| CN112358311A (en) * | 2020-11-27 | 2021-02-12 | 滁州恒通磁电科技有限公司 | Preparation method of high-magnetism anti-cracking magnetic material |
| CN114999809A (en) * | 2022-07-20 | 2022-09-02 | 横店集团东磁股份有限公司 | Rubber-plastic-based permanent magnet and preparation method and application thereof |
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| CN112358311A (en) * | 2020-11-27 | 2021-02-12 | 滁州恒通磁电科技有限公司 | Preparation method of high-magnetism anti-cracking magnetic material |
| CN112358311B (en) * | 2020-11-27 | 2022-04-01 | 滁州恒通磁电科技有限公司 | Preparation method of high-magnetism anti-cracking magnetic material |
| CN114999809A (en) * | 2022-07-20 | 2022-09-02 | 横店集团东磁股份有限公司 | Rubber-plastic-based permanent magnet and preparation method and application thereof |
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Application publication date: 20191008 |