CN106365626A - Manufacturing method of dry-press anisotropic ferrite - Google Patents
Manufacturing method of dry-press anisotropic ferrite Download PDFInfo
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- CN106365626A CN106365626A CN201610791751.9A CN201610791751A CN106365626A CN 106365626 A CN106365626 A CN 106365626A CN 201610791751 A CN201610791751 A CN 201610791751A CN 106365626 A CN106365626 A CN 106365626A
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000005291 magnetic effect Effects 0.000 claims abstract description 18
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 238000001238 wet grinding Methods 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 239000006247 magnetic powder Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims description 20
- 229940025250 camphora Drugs 0.000 claims description 16
- 239000010238 camphora Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 6
- 235000013539 calcium stearate Nutrition 0.000 claims description 6
- 239000008116 calcium stearate Substances 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010298 pulverizing process Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract 2
- 241000723346 Cinnamomum camphora Species 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 229960000846 camphor Drugs 0.000 abstract 1
- 229930008380 camphor Natural products 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011056 performance test Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000005294 ferromagnetic effect Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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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
- C04B35/2641—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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- C04B35/00—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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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
- C04B35/62615—High energy or reactive ball milling
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
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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
- H01F1/10—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
- H01F1/113—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 in a bonding agent
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- 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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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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Abstract
The invention discloses a manufacturing method of dry-press anisotropic ferrite. The method comprises the following steps: carrying out two-stage wet milling on a permanent magnetic ferrite presintered material; putting the slurry obtained by two-stage wet milling into a drying box, and drying; screening the dried material blocks to prepare magnetic powder, adding an adhesive, mixing in a dry-type stirrer, pulverizing by a high-speed pulverizer, and screening to obtain the dry-press anisotropic ferrite powder; pressing the dry-press anisotropic ferrite on an experimental press to obtain a steel magnet, and applying an impulse-type heavy current onto a coil to generate an instantaneous high-impulse magnetic field; and carrying out degumming treatment, and sintering. The powdery camphor can be directly sufficiently mixed with the magnetic powder; the impulse-type heavy current enhances the degree of orientation of the dry-press anisotropic ferrite magnetic powder; the additive is beneficial to enhancing the coercive force of the product; and the dispersing agent enhances the particle size uniformity of the ground magnet powder, and enhances the properties of the dry-press product.
Description
Technical field
The present invention relates to magnetic material correlative technology field, refer in particular to a kind of ferritic manufacture method of dry-pressing opposite sex.
Background technology
Traditional permanent-magnet ferrite manufacture method has dry-pressing formed and two kinds of Wet-pressing molding.Wherein Wet-pressing molding has orientation
Spend, the high feature of magnetic property such as remanent magnetism, applied on a large scale at present.But, dry-pressing formed also have the application of oneself to lead
Domain, it has the features such as shaping efficiency height, applied range, product design variation, can apply to many miniaturizations and shape
The irregular product of shape.
In the manufacture method of existing dry-pressing opposite sex ferromagnetic oxide powder, most critical be exactly magnetic powder manufacturing process and dry-pressing
Moulding process.In the manufacturing process of magnetic powder, main additive has Camphora and calcium stearate, and the addition manner of wherein Camphora has
Two kinds, one kind is dissolved in ethanol and adds, and this can cause the local of powder body to reunite;Another is direct interpolation, due to common
Camphora easily lumps, and is also unfavorable for and magnet powder mix homogeneously.And in the dry pressuring forming process of magnetic powder, the orientation side in magnetic field
Formula and magnetic field size are again particularly important, and current magnetic field orientating mode is that applying one is constant on the direction need magnetic field orientating
Magnetic field, but the size in this constant magnetic field is directly proportional to the bundle number of line bag coil, and be available on moulding press place
The limited space of line bag, this just determine this stationary magnetic field size limited so that dry-pressing the opposite sex ferromagnetic oxide powder degree of orientation
Not high.
Content of the invention
The present invention is above-mentioned in order to overcome the shortcomings of to exist in prior art, there is provided a kind of high dry-pressing opposite sex of degree of orientation
Ferritic manufacture method.
To achieve these goals, the present invention employs the following technical solutions:
A kind of different in nature ferritic manufacture method of dry-pressing, concrete operation step is as follows:
(1) ball-milling technology: first permanent ferrite prefiring material is carried out secondary wet grinding;
(2) stoving process: the slip after secondary wet grinding is put into drying baker and is dried, the magnetic powder after drying is aqueous
Rate is within 0.3wt%;
(3) flouring technology: the material block after drying, first sieves and makes Magnaglo, then add binding agent, in dry mix
Mix in machine, pulverized 40~60 eye mesh screens, prepared dry-pressing opposite sex ferrite powder through high speed disintegrator;
(4) dry pressuring forming process: be pressed into magnet steel on experiment press, the high current of pulsed is applied on coil, produce
One instantaneous pulse magnetic field, is not less than 20000oe;
(5) sintering process: carry out degumming process at 300~500 degrees Celsius, then sinter at 1230~1260 degrees Celsius
0.5~2 hour.
First in flouring technology, choose suitable binding agent so as to can directly be sufficiently mixed with Magnaglo;Then
The high current of pulsed, in dry pressuring forming process, being applied on coil, producing an instantaneous pulse magnetic field, thus avoiding
The phenomenon of stationary magnetic field situation lower coil easily heating, makes the degree of orientation of dry-pressing opposite sex ferromagnetic oxide powder improve simultaneously.
Preferably, in step (1), permanent ferrite prefiring material is the hexagonal ferrite including a, r, b and fe
Body, and there is the molecular formula of following feature: a1~xrx[(fe3+ afe2+ b)12-yby]zo19, wherein a represent one of sr, ba or
Two kinds of elements;R represents and is selected from one of rare earth element and bi element;B represents one of co, ti, mn, zn, ge, as and w
Element, the quantivalence of co element is positive trivalent;Wherein a+b is equal to 1;Z is 0.9~1.1;The scope of x and y be respectively as follows: 0≤x≤
O.54,0≤y≤0.45.
Preferably, described a is 0.97~0.999, b is 0.001~0.03;The span of x and y is: 1.0≤x/y
≤ 1.5, z are 1.
Preferably, in step (1), first in permanent ferrite prefiring material, add additive and dispersant, after carry out
Secondary wet grinding, wherein: additive includes sio2And caco3, dispersant is at least one in boric acid and organic dispersing agent, adds
The total weight percent that the total addition level of agent and dispersant accounts for permanent ferrite prefiring material is 0~1.5wt%.sio2、caco3Add
Plus the addition of agent, contribute to being formed crystal boundary in sintering process, hinder growing up of ferrite crystal grains, thus effectively improving rectifying of product
Stupid power;The addition of dispersant, that on the one hand plays grinding aid in crushing process acts on the magnet powder particle diameter so that after grinding
It is more uniformly distributed;On the other hand the performance of dry-pressing product is also increased.
Preferably, in step (3), binding agent includes in polyvinyl alcohol, Polyethylene Glycol, Camphora and calcium stearate
Kind or multiple, and Camphora must be contained, wherein Camphora be shaped as powder, it is pre- that the addition of binding agent accounts for permanent-magnet ferrite
The total weight percent of imitation frosted glass is 1~5wt%.The feature of above-mentioned Camphora makes it not lump when adding, and is conducive to and magnet powder
Last is sufficiently mixed.
The invention has the beneficial effects as follows: powder Camphora can directly be sufficiently mixed with Magnaglo;Using pulsed
High current is so that the degree of orientation of dry-pressing opposite sex ferromagnetic oxide powder improves;Additive is favorably improved the coercivity of product;Dispersant
So that the magnet powder particle diameter after grinding is more uniformly distributed, also the performance of dry-pressing product is also increased simultaneously.
Specific embodiment
With reference to specific embodiment, the present invention will be further described.
Embodiment 1:
Preparation one kind has sr0.75la0.25fe11.8co0.2o19The Preburning material of ferrite principal phase, weighs fe by proportioning2o3(pure
Degree >=99.3wt%, cl-≤ 0.1wt%, the original mean particle≤1.5um of granule), la2o3(purity >=99.3wt%, granule
Original mean particle≤5um), co2o3(co content >=72wt%, the original mean particle≤3um of granule), srco3(purity
>=97wt%, the original mean particle≤1.5um of granule) etc. raw material carry out ball milling of wet method, Ball-milling Time 5 hours, mix
O.8um average particle size after conjunction is, is subsequently dried slip in an oven, processes through 10mpa pressure precompressed, subsequently
1210 DEG C of pre-burnings in atmosphere, temperature retention time 1 hour, obtain block Preburning material.Preburning material is processed through dry type coarse pulverization, coarse powder
The mean diameter of broken rear powder body is 4um.The ferritic concrete technology of the dry-pressing opposite sex is as follows:
1st, ball-milling technology
First permanent ferrite prefiring material is carried out secondary wet grinding, add the caco of 1.07wt%3, the sio of 0.3wt%2、
The boric acid of 0.15wt%, its technique is such as the secondary wet-grinding technology and relative device in traditional permanent-magnet ferrite production.
2nd, stoving process
Slip after secondary ball milling is put into drying baker and is dried 20 hours the magnetic it is desirable to after drying with 120 degrees Celsius
Property powder moisture content is within 0.3wt%.
3rd, flouring technology
Material block after drying, first crosses 20 eye mesh screens, makes Magnaglo;Then add 3wt% powder Camphora and
0.5wt% calcium stearate (crosses 100 mesh sieves), after mixing 1 hour, pulverizes 40 mesh through high speed disintegrator in dry mix machine
Screen cloth, prepared dry-pressing opposite sex ferrite powder.
4th, dry pressuring forming process
100 tons of experiment press are pressed into magnet steel, its pressure is 1mpa, the high current of pulsed is applied on coil, produce
Raw instantaneous pulse magnetic field 20000oe.
5th, sintering process
Carry out degumming process at 300~500 degrees Celsius, then with 1230 degrees Celsius of 1 hour sintering of temperature, wherein
Rise gentle rate of cooling slow, it is to avoid produce cracking.
Finally, performance test is carried out to product, test result is shown in Table 1.
Embodiment 2:
Preburning material in embodiment 2 is identical with embodiment 1, and preparation technology in addition to following flouring technology remaining technique with
Embodiment 1 is identical.
3rd, flouring technology
Material block after drying, first crosses 20 eye mesh screens, makes Magnaglo;Then add the powder Camphora (mistake of 4wt%
100 mesh sieves), after mixing 1 hour in dry mix machine, pulverized 40 eye mesh screens, the prepared dry-pressing opposite sex through high speed disintegrator
Ferrite powder.
Finally, performance test is carried out to product, test result is shown in Table 1.
Embodiment 3:
Preburning material in embodiment 3 is identical with embodiment 1, and preparation technology is in addition to following powder processed and dry pressuring forming process
Remaining technique is same as Example 1.
3rd, flouring technology
Material block after drying, first crosses 20 eye mesh screens, makes Magnaglo;Then add the powder Camphora (mistake of 4wt%
100 mesh sieves), after mixing 1 hour in dry mix machine, pulverized 40 eye mesh screens, the prepared dry-pressing opposite sex through high speed disintegrator
Ferrite powder.
4th, dry pressuring forming process
100 tons of experiment press are pressed into magnet steel, its pressure is 1mpa, the high current of pulsed is applied on coil, produce
Raw instantaneous pulse magnetic field 30000oe.
Finally, performance test is carried out to product, test result is shown in Table 1.
Comparative example 1:
Preburning material in comparative example 1 is identical with embodiment 1, and preparation technology is in addition to following powder processed and dry pressuring forming process
Remaining technique is same as Example 1.
3rd, flouring technology
Material block after drying, first crosses 20 eye mesh screens, makes Magnaglo;Then by Camphora and ethanol with (1 gram: 1 milliliter)
Ratio mixing, make solution, then this solution and Magnaglo added with 3% ratio, and add 0.5wt% calcium stearate
(crossing 100 mesh sieves), after mixing 1 hour, pulverized 40 eye mesh screens through high speed disintegrator, prepared dry-pressing is different in dry mix machine
Property ferrite powder.
4th, dry pressuring forming process
100 tons of experiment press are pressed into magnet steel, its pressure is 1mpa, forming magnetic field is 10000oe.
Finally, performance test is carried out to product, test result is shown in Table 1.
Comparative example 2:
Preburning material in comparative example 2 is identical with embodiment 1, and preparation technology is in addition to following powder processed and dry pressuring forming process
Remaining technique is same as Example 1.
3rd, flouring technology
Material block after drying, first crosses 20 eye mesh screens, makes Magnaglo;Then add 3wt% powder Camphora and
0.5wt% calcium stearate (crosses 100 mesh sieves), after mixing 1 hour, pulverizes 40 mesh through high speed disintegrator in dry mix machine
Screen cloth, prepared dry-pressing opposite sex ferrite powder.
4th, dry pressuring forming process
100 tons of experiment press are pressed into magnet steel, its pressure is 1mpa, forming magnetic field is 10000oe.
Finally, performance test is carried out to product, test result is shown in Table 1.
Table 1 embodiment 1-3 and comparative example 1-2 performance comparison
br(gs) | hcb(oe) | hcj(oe) | (bh)max(mgoe) | |
Embodiment 1 | 3937 | 3429 | 4201 | 3.691 |
Embodiment 2 | 3964 | 3441 | 4191 | 3.695 |
Embodiment 3 | 3995 | 3488 | 4128 | 3.800 |
Comparative example 1 | 3873 | 3375 | 4192 | 3.476 |
Comparative example 2 | 3899 | 3301 | 4136 | 3.577 |
Claims (5)
1. the different in nature ferritic manufacture method of a kind of dry-pressing, is characterized in that, concrete operation step is as follows:
(1) ball-milling technology: first permanent ferrite prefiring material is carried out secondary wet grinding;
(2) stoving process: the slip after secondary wet grinding is put into drying baker and is dried, the magnetic powder moisture content after drying exists
Within 0.3wt%;
(3) flouring technology: the material block after drying, first sieves and makes Magnaglo, then add binding agent, in dry mix machine
Mixing, pulverized 40~60 eye mesh screens, prepared dry-pressing opposite sex ferrite powder through high speed disintegrator;
(4) dry pressuring forming process: be pressed into magnet steel on experiment press, the high current of pulsed is applied on coil, produce
Instantaneous pulse magnetic field, is not less than 20000oe;
(5) sintering process: carry out degumming process at 300~500 degrees Celsius, then sinter 0.5~2 at 1230~1260 degrees Celsius
Hour.
2. a kind of ferritic manufacture method of the dry-pressing opposite sex according to claim 1, is characterized in that, in step (1), forever
Magnetic ferrites Preburning material is the hexgonal screw including a, r, b and fe, and has the molecular formula of following feature: a1~xrx
[(fe3+ afe2+ b)12-yby]zo19, wherein a represents one of sr, ba or two kinds of elements;R represents and is selected from rare earth element and bi
One of element;B represents one of co, ti, mn, zn, ge, as and w element, and the quantivalence of co element is positive trivalent;Its
Middle a+b is equal to 1;Z is 0.9~1.1;The scope of x and y is respectively as follows: 0≤x≤0.54,0≤y≤0.45.
3. a kind of ferritic manufacture method of the dry-pressing opposite sex according to claim 2, is characterized in that, described a is 0.97~
0.999, b is 0.001~0.03;The span of x and y is: 1.0≤x/y≤1.5, and z is 1.
4. the ferritic manufacture method of a kind of dry-pressing opposite sex according to claim 1 or 2 or 3, is characterized in that, in step
(1), in, first in permanent ferrite prefiring material, add additive and dispersant, after carry out secondary wet grinding, wherein: additive includes
sio2And caco3, dispersant is at least one in boric acid and organic dispersing agent, and the total addition level of additive and dispersant accounts for forever
The total weight percent of magnetic ferrites Preburning material is 0~1.5wt%.
5. a kind of ferritic manufacture method of the dry-pressing opposite sex according to claim 1, is characterized in that, in step (3), glue
Mixture includes one of polyvinyl alcohol, Polyethylene Glycol, Camphora and calcium stearate or multiple, and must contain Camphora, wherein
Camphora be shaped as powder, the total weight percent that the addition of binding agent accounts for permanent ferrite prefiring material is 1~5wt%.
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CN108285348A (en) * | 2018-02-08 | 2018-07-17 | 安徽盛美格新材料有限公司 | A kind of manufacturing method of dry-pressing opposite sex permanent-magnet ferrite magnetic powder |
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CN110323027A (en) * | 2018-03-28 | 2019-10-11 | Tdk株式会社 | The manufacturing method of ferrite sintered magnet and ferrite sintered magnet |
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CN109102977B (en) * | 2018-08-20 | 2020-02-14 | 横店集团东磁股份有限公司 | High-density dry-pressed anisotropic ferrite magnet and manufacturing method thereof |
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Denomination of invention: A manufacturing method for dry pressed anisotropic ferrite Granted publication date: 20190115 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Registration number: Y2024330001130 |