CN105622082B - A kind of preparation method of permanent-magnet ferrite anisotropic dry press-powder material - Google Patents
A kind of preparation method of permanent-magnet ferrite anisotropic dry press-powder material Download PDFInfo
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Abstract
A kind of preparation method of permanent-magnet ferrite anisotropic dry press-powder material, comprises the following steps：（1）Magnetic property reinforcing agent is added in permanent ferrite prefiring material, and carries out wet ball grinding, obtains permanent ferrite slurry；（2）By permanent ferrite slurry under magnetic field condition, wet method compression moulding obtains permanent-magnet ferrite green compact；（3）Permanent-magnet ferrite green compact are subjected to coarse crushing, drying obtains the magnetic material block with orientation；（4）Adhesive and lubricant will be added in magnetic material block with orientation, disperse to crush, sieving obtains anisotropic dry press-powder material.Anisotropic dry press-powder material orientation, good fluidity obtained by the method for the present invention；Gained dry-pressing powder is high compared with conventional dry press-powder material by the magnetic property of dry-pressing formed products obtained therefrom, more traditional wet pressing, the pressing time is short, and production efficiency can improve 3 times or more, can produce the high-end dry-pressing product of small size, and remanent magnetism performance can reach wet pressing product 95% and more than.
Description
Technical field
The present invention relates to a kind of preparation methods of permanent magnet ferrite powder, and in particular to a kind of permanent-magnet ferrite anisotropy
The preparation method of dry-pressing powder.
Background technology
It is that dry-pressing powder is fitted into mold cavity that dry-press process, which prepares permanent-magnet ferrite product, is pressed in magnetic field, powder
Expect orientations, gas discharge in gap, particle progressively draws close close occlusion mutually, final compression moulding.Lead to wet moulding
It crosses slurry shaping to compare, for Wet-pressing molding since slurry is molded, mold and equipment are complicated, can not suppress small-size product and Gao Jing
To than products such as magnet rings, the said goods can only use dry-press process, and dry-press process process is quick, efficient.But existing biography
Orientation of the dry-pressing powder during pressing under magnetic field, the mobility of uniting are poorer than slurry, generally wet so as to be difficult to obtain high remanent magnetism
The 80~90% of method shaping remanent magnetism, limit the performance of dry-pressing permanent-magnet ferrite product, and some small sizes involved in actual production
High-end dry-pressing ferrite product, it is desirable that magnetic property is high, and particularly with high remanent magnetism, and existing dry-pressing properties of powder can not meet this
The demand of sample, therefore, how to improve the performance of dry-pressing powder becomes urgent problem to be solved.
In order to obtain high performance dry-pressing powder, focusing principally in the prior art improves dry-pressing powder mobility, disperses
Property, it is by grinders if CN101205137A discloses a kind of manufacturing method of dry-pressing formed sintering permanent magnet ferrite
A certain amount of organic dispersing agent and adhesive are added in sequence to improve the mobility of powder, this method is directly by permanent-magnet ferrite material
Slurry dries powder processed, although raising powder particles mobility is strong, is easy to arrange along the direction of magnetization in magnetic field, dry-pressing powder
Particle be not magnetic single domain, but the aggregate to be condensed together by multiple magnetic single domains, the single domain in particle is orientated and differs
It causes, can not further be promoted so as to cause the dry-pressing powder degree of orientation, therefore the dry-pressing formed product remanent magnetism prepared by it is up to phase
Answer wet pressing properties of product 90%；CN104496452A discloses a kind of ferrite preparation method and its prepared ferrite, is logical
It crosses vibrating ball-mill and the high speed dispersion processing of 20~40min is carried out to ferrite prefiring material xeraphium so as to reduce ferrite paricles intergranular
Ferrite slurry is directly dried vibration again by adhesion, this method, and the single domain orientation in this method powder particles is similary and differs
It causes, performance improves limited.
The content of the invention
The technical problems to be solved by the invention be overcome existing dry-pressing powder technology of preparing existing for drawbacks described above, carry
For a kind of gained dry-pressing powder orientation, good fluidity, production efficiency is high, the molding dry-pressing product magnetic property of gained dry-pressing powder
The preparation method of high permanent-magnet ferrite anisotropic dry press-powder material.
The technical solution adopted by the present invention to solve the technical problems is as follows：A kind of permanent-magnet ferrite anisotropic dry press-powder
The preparation method of material, comprises the following steps：
（1）The magnetic property reinforcing agent for being equivalent to its quality 0.9~3.0% is added in permanent ferrite prefiring material, and is carried out
Wet ball grinding obtains the permanent ferrite slurry that particle mean size is 0.8~0.9 μm；
（2）By step（1）Gained permanent ferrite slurry in 9000~10000Oe of magnetic field intensity, 12~16MPa's of pressure
Under the conditions of, wet method compression moulding obtains permanent-magnet ferrite green compact；
（3）By step（2）Gained permanent-magnet ferrite green compact carry out coarse crushing, are dried to water content≤0.5%, obtain with taking
The magnetic material block of tropism；
（4）By step（3）Gained, which has in the magnetic material block of orientation, adds the bonding for being equivalent to its quality 0.4~1.5%
Agent and the lubricant for being equivalent to its quality 0.1~1.2% after pulverizer disperses crushing, cross 60~100 mesh sieves, obtain anisotropy
Dry-pressing powder.
Further, step（1）In, the permanent ferrite prefiring material be Strontium ferrite powder, molecular formula SrO
6Fe2O3。
Further, step（1）In, add in the magnetic property enhancing for being equivalent to permanent ferrite prefiring material quality 1.5~2.5%
Agent.
Further, step（1）In, the magnetic property reinforcing agent is calcium carbonate, silica, boric acid and calcium gluconate
Mixture.The additive helps to improve remanent magnetism and coercivity, adding too much or too low can all cause products obtained therefrom magnetic
It can decline.
Further, the additive amount of the calcium carbonate, silica, boric acid and calcium gluconate is respectively equivalent to permanent magnet oxygen
The 0.5~1.2% of body Preburning material, 0.1~0.5%, 0.1~0.5% and 0.2~0.8%.
Further, step（1）In, the time of the wet ball grinding is 12~15h.
Further, step（2）In, the shape of the wet method compression moulding is upper and lower surface parallel and perpendicular to magnetic field intensity
The three-dimensional shape in direction.The preferred box-shaped of three-dimensional shape（Pane shape or square block shape）, patty, circular ring shape, horseshoe
Shape etc. is pressed into magnetic shoe shape compared with tradition, and the three-dimensional shape is more advantageous to so that the magnetic single domain orientation in green compact is consistent, more
It is preferred that box-shaped.
Step（3）In, as long as the coarse crushing removes moisture removal convenient for drying, broken size need not be controlled strictly
System.
Further, step（3）In, the temperature of the drying is 150~300 DEG C, and the time of drying is 4~6h.
Further, step（4）In, it is added in the magnetic material block with orientation and is equivalent to its quality 0.5~1.0%
Adhesive and the lubricant for being equivalent to its quality 0.2~0.8%.
Further, step（4）In, described adhesive is one kind or several in polyvinyl alcohol, camphor or methylcellulose etc.
Kind.
Further, step（4）In, the lubricant for one kind in polyethylene glycol, calcium stearate or barium stearate etc. or
It is several.
Step（4）In, the scattered grinding time is 2~3min.
By permanent-magnet ferrite anisotropic dry press-powder material obtained by the method for the present invention according to the prior art, by dry-pressing formed,
It is sintered again, obtains dry-pressing permanent-magnet ferrite product.
The principle that the method for the present invention fundamentally improves dry-pressing powder orientation is：The particle of dry-pressing powder is not single
Magnetic single domain, but the aggregate to be condensed together by multiple magnetic single domains, the size of magnetic single domain is 0.9 μm.In the method for the present invention,
Preburning material is 0.8~0.9 μm of slurry by wet-milling to granularity, and magnetic single domain orientation is chaotic in slurry, as shown in Figure 1, by slurry
By precompressed, premagnetization, make the magnetic single domain orientations in slurry consistent, as shown in Fig. 2, drying, broken, scattered crushing
Afterwards, in dry-pressing powder particles magnetic single domain orientation still have uniformity, as shown in figure 3, and conventional dry press-powder material, be directly will material
Slurry is dried, and magnetic single domain does not keep orientation consistent in dry-pressing powder particles, is taken as shown in figure 4, ultimately resulting in dry-pressing powder particles
Tropism is low, and dry-pressing properties of product are low.
The method of the present invention has the beneficial effect that：
（1）The method of the present invention that is, after precompressed, premagnetization, makes magnetic single domain orientation one in dry-pressing powder particles through wet moulding
It causes, fundamentally improves the orientation of dry-pressing powder；
（2）For the method for the present invention by adding suitable adhesive and lubricant, the material for being dispersed through crushing crosses 60~100 mesh
Sieve, so as to improve the mobility of dry-pressing powder, when being finally pressed into product, particle is easy to towards magnetic direction oriented；
（3）Dry-pressing permanent-magnet ferrite of the anisotropic dry press-powder material as obtained by dry-pressing formed produces obtained by the method for the present invention
The magnetic property of product is high compared with dry-pressing product obtained by conventional dry press-powder material, more traditional wet pressing, present invention gained anisotropic dry press-powder material
Pressing time is short, and production efficiency can improve 3 times or more, can produce the high-end product of small size, and remanent magnetism performance can reach wet pressing
Product 95% and more than.
Description of the drawings
Fig. 1 is permanent ferrite slurry magnetic single domain orientation schematic diagram；
Fig. 2 is 1 step of the embodiment of the present invention（2）Gained permanent-magnet ferrite green compact magnetic single domain orientation is shown after precompressed, premagnetization
It is intended to；
Fig. 3 is 1 gained dry-pressing powder particles magnetic single domain of embodiment of the present invention orientation schematic diagram；
Fig. 4 is conventional dry pressure powder particles magnetic single domain orientation schematic diagram.
Specific embodiment
With reference to embodiment and attached drawing, the invention will be further described.
Permanent ferrite prefiring material used in the embodiment of the present invention is Y40 trade mark Strontium ferrite powders（Molecular formula
SrO·6Fe2O3）；Chemical reagent used in other, unless otherwise specified, is obtained by routine business approach.
Embodiment 1
（1）It is added in permanent ferrite prefiring material and is equivalent to the calcium carbonate of its quality 0.6%, 0.3% silica,
0.3% boric acid and 0.6% calcium gluconate, and wet ball grinding 12h obtain the permanent ferrite slurry that particle mean size is 0.9 μm；
（2）By step（1）Gained permanent ferrite slurry is under the conditions of magnetic field intensity 9000Oe, the condition of pressure 14MPa
Under, wet method is pressed into pane shape, obtains permanent-magnet ferrite green compact；
（3）By step（2）Gained permanent-magnet ferrite green compact carry out coarse crushing, and at 200 DEG C, drying 5h to water content is
0.3%, obtain the magnetic material block with orientation；
（4）By step（3）Gained, which has in the magnetic material block of orientation, adds the adhesive camphor tree for being equivalent to its quality 0.9%
Brain powder and the lubricant stearic acid calcium for being equivalent to its quality 0.6% after pulverizer disperses to crush 2min, cross 60 mesh sieves, obtain it is each to
Isotropic dry pressing powder.
By gained anisotropic dry press-powder material, under conditions of magnetic field intensity 12000Oe, pressure 10MPa, diameter is pressed into
The round pie sample of 30mm, thickness 20mm, pressing time 15s；It is placed in sintering electrical kiln, is heated up with the rate of 3 DEG C/min again
To 1200 DEG C, 2h is sintered, obtains dry-pressing permanent-magnet ferrite product.
The magnetic property of detection gained dry-pressing permanent-magnet ferrite product, as a result referring to table 1.
Embodiment 2
（1）It is added in permanent ferrite prefiring material and is equivalent to the calcium carbonate of its quality 0.8%, 0.2% silica,
0.3% boric acid and 0.4% calcium gluconate, and wet ball grinding 15h obtain the permanent ferrite slurry that particle mean size is 0.8 μm；
（2）By step（1）Gained permanent ferrite slurry is under the conditions of magnetic field intensity 10000Oe, the condition of pressure 12MPa
Under, wet method is pressed into square block shape, obtains permanent-magnet ferrite green compact；
（3）By step（2）Gained permanent-magnet ferrite green compact carry out coarse crushing, and at 300 DEG C, drying 6h to water content is
0.2%, obtain the magnetic material block with orientation；
（4）By step（3）Gained, which has in the magnetic material block of orientation, adds the adhesive camphor tree for being equivalent to its quality 0.6%
Brain powder and the lubricant stearic acid calcium for being equivalent to its quality 0.8% after pulverizer disperses to crush 3min, cross 80 mesh sieves, obtain it is each to
Isotropic dry pressing powder.
By gained anisotropic dry press-powder material, under conditions of magnetic field intensity 12000Oe, pressure 10MPa, diameter is pressed into
The round pie sample of 30mm, thickness 20mm, pressing time 18s；It is placed in sintering electrical kiln, is heated up with the rate of 3 DEG C/min again
To 1200 DEG C, 2h is sintered, obtains dry-pressing permanent-magnet ferrite product.
The magnetic property of detection gained dry-pressing permanent-magnet ferrite product, as a result referring to table 1.
Embodiment 3
（1）It is added in permanent ferrite prefiring material and is equivalent to the calcium carbonate of its quality 1.2%, 0.4% silica,
0.1% boric acid and 0.3% calcium gluconate, and wet ball grinding 12h obtain the permanent ferrite slurry that particle mean size is 0.9 μm；
（2）By step（1）Gained permanent ferrite slurry is under the conditions of magnetic field intensity 9000Oe, the condition of pressure 16MPa
Under, wet method is pressed into pane shape, obtains permanent-magnet ferrite green compact；
（3）By step（2）Gained permanent-magnet ferrite green compact carry out coarse crushing, and at 200 DEG C, drying 5h to water content is
0.3%, obtain the magnetic material block with orientation；
（4）By step（3）There is gained the magnetic of orientation to expect that the adhesive for being equivalent to its quality 0.5% is added in block to be gathered
Vinyl alcohol and the lubricant polyethylene glycol for being equivalent to its quality 0.2% after pulverizer disperses to crush 3min, are crossed 100 mesh sieves, are obtained
Anisotropic dry press-powder material.
By gained anisotropic dry press-powder material, under conditions of magnetic field intensity 12000Oe, pressure 10MPa, diameter is pressed into
The round pie sample of 30mm, thickness 20mm, pressing time 16s；It is placed in sintering electrical kiln, is heated up with the rate of 3 DEG C/min again
To 1200 DEG C, 2h is sintered, obtains dry-pressing permanent-magnet ferrite product.
The magnetic property of detection gained dry-pressing permanent-magnet ferrite product, as a result referring to table 1.
Comparative example 1
This comparative example is directly by step in embodiment 1（1）Gained slurry in magnetic field intensity 12000Oe, pressure 10MPa's
Under the conditions of, it is pressed into diameter 30mm, the round pie sample of thickness 20mm requires upper mold water sucting plate constantly to absorb water in pressing process,
Since absorbent time is longer, pressing time 80s；It is placed in again in sintering electrical kiln, 1200 DEG C is warming up to the rate of 3 DEG C/min,
2h is sintered, obtains wet pressing permanent-magnet ferrite product.
The magnetic property of detection gained permanent-magnet ferrite product, as a result referring to table 1.
Comparative example 2
This comparative example is differed only in embodiment 1：Remove step（2）；In former step（3）In, by step（1）Gained
Slurry is at 200 DEG C, drying 5h to water content≤0.5%.Remaining same embodiment 1.
Dry-pressing permanent-magnet ferrite product preparation method is the same as embodiment 1.
The magnetic property of detection gained permanent-magnet ferrite product, as a result referring to table 1.
1 Examples 1 to 3 of table and comparative example 1, the magnetic property Comparative result table of 2 products obtained therefroms
Comparative example 1 is with wet pressing permanent-magnet ferrite product obtained by batch wet moulding, and comparative example 2 is with batch non-precompressed, premagnetization
Change dry-pressing permanent-magnet ferrite product obtained by dry-pressing powder.From Examples 1 to 3 compared with comparative example 1, Examples 1 to 3 dry-pressing
The remanent magnetism performance of the molding dry-pressing permanent-magnet ferrite product of powder pressing（Br）Reach the production of 1 gained wet pressing permanent-magnet ferrite of comparative example
Product 95% and more than, remanent magnetism height illustrates favorable orientation（As shown in Figure 3）；The magnetic of 2 gained dry-pressing permanent-magnet ferrite product of comparative example
Performance is poor compared with the magnetic property of dry-pressing permanent-magnet ferrite product obtained by Examples 1 to 3, particularly remanent magnetism, and remanent magnetism is low illustrates to be orientated
Property is bad（As shown in Figure 4）, therefore, dry-pressing powder prepared by the method for the present invention can obtain the higher dry-pressing permanent magnet oxygen of magnetic property
Body product.
It was verified that with gained permanent-magnet ferrite anisotropic dry press-powder material of the invention, volume≤1cm can be produced3It is small
Size dry-pressing permanent-magnet ferrite product, and Wet-pressing molding is since mold and equipment are complicated, small size product can not be suppressed, general to produce
Product volume >=2cm3。
In conclusion it can be prepared compared with conventional dry press-powder material orientation, mobility higher using the method for the present invention, finally
The higher anisotropic dry press-powder material of gained dry-pressing permanent-magnet ferrite product magnetic property；The anisotropic dry obtained by the method for the present invention
Press-powder material prepares the more traditional wet pressing of dry-pressing permanent-magnet ferrite product, and the pressing time is short, and production efficiency is high, can produce the height of small size
Hold product, and the remanent magnetism performance of dry-pressing permanent-magnet ferrite product can reach wet pressing permanent-magnet ferrite product 95% and more than.
Claims (23)
1. a kind of preparation method of permanent-magnet ferrite anisotropic dry press-powder material, which is characterized in that comprise the following steps：
（1）The magnetic property reinforcing agent for being equivalent to its quality 0.9~3.0% is added in permanent ferrite prefiring material, and carries out wet method
Ball milling obtains the permanent ferrite slurry that particle mean size is 0.8~0.9 μm；The magnetic property reinforcing agent is calcium carbonate, titanium dioxide
The mixture of silicon, boric acid and calcium gluconate；The calcium carbonate, silica, the additive amount difference of boric acid and calcium gluconate
It is equivalent to the 0.5~1.2% of permanent ferrite prefiring material, 0.1~0.5%, 0.1~0.5% and 0.2~0.8%；
（2）By step（1）Gained permanent ferrite slurry is in 9000~10000Oe of magnetic field intensity, the condition of 12~16MPa of pressure
Under, wet method compression moulding obtains permanent-magnet ferrite green compact；
（3）By step（2）Gained permanent-magnet ferrite green compact carry out coarse crushing, are dried to water content≤0.5%, obtain with orientation
Magnetic material block；
（4）By step（3）Gained have addition in the magnetic material block of orientation be equivalent to its quality 0.4~1.5% adhesive and
The lubricant of its quality 0.1~1.2% is equivalent to, after pulverizer disperses crushing, 60~100 mesh sieves is crossed, obtains anisotropy dry-pressing
Powder.
2. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1, it is characterised in that：Step
（1）In, the permanent ferrite prefiring material is Strontium ferrite powder.
3. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（1）In, add in the magnetic property reinforcing agent for being equivalent to permanent ferrite prefiring material quality 1.5~2.5%.
4. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（1）In, the time of the wet ball grinding is 12~15h.
5. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 3, it is characterised in that：Step
（1）In, the time of the wet ball grinding is 12~15h.
6. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（2）In, the shape of the wet method compression moulding is three-dimensional shape of the upper and lower surface parallel and perpendicular to magnetization direction.
7. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 3, it is characterised in that：Step
（2）In, the shape of the wet method compression moulding is three-dimensional shape of the upper and lower surface parallel and perpendicular to magnetization direction.
8. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 4, it is characterised in that：Step
（2）In, the shape of the wet method compression moulding is three-dimensional shape of the upper and lower surface parallel and perpendicular to magnetization direction.
9. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（3）In, the temperature of the drying is 150~300 DEG C, and the time of drying is 4~6h.
10. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 3, it is characterised in that：Step
（3）In, the temperature of the drying is 150~300 DEG C, and the time of drying is 4~6h.
11. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 4, it is characterised in that：Step
（3）In, the temperature of the drying is 150~300 DEG C, and the time of drying is 4~6h.
12. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 6, it is characterised in that：Step
（3）In, the temperature of the drying is 150~300 DEG C, and the time of drying is 4~6h.
13. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（4）In, it is added in the magnetic material block with orientation and is equivalent to the adhesive of its quality 0.5~1.0% and is equivalent to its matter
The lubricant of amount 0.2~0.8%.
14. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 3, it is characterised in that：Step
（4）In, it is added in the magnetic material block with orientation and is equivalent to the adhesive of its quality 0.5~1.0% and is equivalent to its quality
0.2~0.8% lubricant.
15. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 4, it is characterised in that：Step
（4）In, it is added in the magnetic material block with orientation and is equivalent to the adhesive of its quality 0.5~1.0% and is equivalent to its quality
0.2~0.8% lubricant.
16. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 6, it is characterised in that：Step
（4）In, it is added in the magnetic material block with orientation and is equivalent to the adhesive of its quality 0.5~1.0% and is equivalent to its quality
0.2~0.8% lubricant.
17. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 9, it is characterised in that：Step
（4）In, it is added in the magnetic material block with orientation and is equivalent to the adhesive of its quality 0.5~1.0% and is equivalent to its quality
0.2~0.8% lubricant.
18. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 1 or claim 2, it is characterised in that：Step
Suddenly（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second
One or more of glycol, calcium stearate or barium stearate.
19. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 3, it is characterised in that：Step
（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second two
One or more of alcohol, calcium stearate or barium stearate.
20. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 4, it is characterised in that：Step
（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second two
One or more of alcohol, calcium stearate or barium stearate.
21. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 6, it is characterised in that：Step
（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second two
One or more of alcohol, calcium stearate or barium stearate.
22. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 9, it is characterised in that：Step
（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second two
One or more of alcohol, calcium stearate or barium stearate.
23. the preparation method of permanent-magnet ferrite anisotropic dry press-powder material according to claim 13, it is characterised in that：Step
（4）In, described adhesive is one or more of polyvinyl alcohol, camphor or methylcellulose；The lubricant is poly- second two
One or more of alcohol, calcium stearate or barium stearate.
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| CN106587974B (en) * | 2016-12-23 | 2019-12-31 | 湖南航天磁电有限责任公司 | Method for improving remanence of dry-pressing powder molding permanent magnetic ferrite |
| CN108147803B (en) * | 2017-12-13 | 2020-08-07 | 湖南航天磁电有限责任公司 | Preparation method of dry-process molded strontium ferrite magnet |
| CN109081690A (en) * | 2018-08-15 | 2018-12-25 | 横店集团东磁股份有限公司 | A kind of preparation method of the high two polar diameter anisotropy magnet ring of table magnetic dry-pressing of big height |
| CN109133900A (en) * | 2018-10-29 | 2019-01-04 | 湖南航天磁电有限责任公司 | High dry-pressing formed permanent magnetic ferrite magnet of surface magnetic flux density and preparation method thereof |
| CN110483071A (en) * | 2019-08-22 | 2019-11-22 | 江门江益磁材有限公司 | A kind of dry-pressing permanent-magnet ferrite and its manufacturing method |
| CN111018510A (en) * | 2019-12-26 | 2020-04-17 | 南京大成材料科技有限公司 | Manufacturing method of multi-pole magnetic ring |
| CN111646791A (en) * | 2020-05-07 | 2020-09-11 | 东阳市海成机电材料有限公司 | Preparation method of dry-pressing permanent magnetic ferrite based on orthogonal test |
| CN114380588B (en) * | 2020-10-20 | 2023-03-24 | 海安南京大学高新技术研究院 | Preparation method of dry-pressed anisotropic permanent magnetic ferrite |
| CN112614689A (en) * | 2020-12-25 | 2021-04-06 | 中钢集团南京新材料研究院有限公司 | Method for improving anisotropy of bonded permanent magnetic ferrite magnetic powder |
| CN115010478B (en) * | 2022-07-06 | 2023-09-26 | 横店集团东磁股份有限公司 | Different-polarity dry-pressed ferrite and preparation method thereof |
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