CN103065760A - Integral type anisotropic multipolar ferrite bead and preparation method thereof - Google Patents
Integral type anisotropic multipolar ferrite bead and preparation method thereof Download PDFInfo
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- CN103065760A CN103065760A CN201110317891XA CN201110317891A CN103065760A CN 103065760 A CN103065760 A CN 103065760A CN 201110317891X A CN201110317891X A CN 201110317891XA CN 201110317891 A CN201110317891 A CN 201110317891A CN 103065760 A CN103065760 A CN 103065760A
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Abstract
The invention discloses an integral type anisotropic multipolar ferrite bead and a preparation method thereof. The ferrite bead is composed of main composition and auxiliary composition. The main composition comprises ferric oxide and SrO by mass ratio of 1:5.5-1:5.7. On the basis of the sum of the mass of all main composition, the auxiliary composition comprises 0.35%-0.50% of kaolin, 0.40%-0.60% of calcium carbonate, and 1.0%-5.0% nanometer inorganic fluxing agents. According to the integral type anisotropic multipolar ferrite bead, residual magnetism Br is larger than or equal to 400mT, coercive force Hcb is larger than or equal to 245kA/m, intrinsic coercive force Hcj is larger than or equal to 250kA/m, and a maximum magnetic energy product (BH) is larger than or equal to 30kJ/m3.
Description
Technical field
The present invention relates to multipole ferrite bead of a kind of integral type anisotropy and preparation method thereof.
Background technology
The multipole ferrite bead of anisotropy is widely used in fields such as convertible frequency air-conditioner motor, mahjong machine, washing machine, Oil pump electrical machinery, servomotor and stepping motors.In the servomotor that exchanges and brushless electric machine, as the permanent magnet of stator or rotor, need to provide in the side around rotary main shaft the Surface field of period profile, to guarantee that simultaneously the magnetic flux distribution difference in each cycle is less.The periodical magnetic filed of above requirement is provided, and traditional method is: settle all identical magnetic shoes of shape size, material property and Surface field around rotary main shaft, the magnetic shoe position becomes several parts by circumference equal dividing, such as 4,8 etc.Boning in conjunction with employing glue between magnetic shoe.Such magnetic tile bonding multi-pole magnet-ring design exists two problems: the one, and the leakage field phenomenon is serious, and the magnetic flux distribution uniformity is also relatively poor, causes the slot effect of motor to increase; The 2nd, under the high rotating speed of motor rotary main shaft or high temperature, the glue of adhesive magnetic tile may lose efficacy, and caused the magnetic shoe element falling, the fail safe when having a strong impact on the motor use.
For above deficiency, people have developed the integral type multi-pole magnet-ring.Whole magnet ring can be divided into isotropism and anisotropy two classes.Wherein, isotropic magnet ring is under the identical condition that magnetizes, and the magnetic flux distribution uniformity is best.But because magnet ring orientation not in manufacture process, therefore, same material magnetizes under the condition equally, and the surface magnetic flux that the isotropism magnet ring produces only is about 1/2nd of the surface magnetic flux of different in nature magnet ring, and magnetic property is lower, and corresponding output power of motor is less.The magnetic field orientating method of forming is adopted in the preparation of anisotropic ferrite usually, D.C. magnetic field additional when namely utilizing moulding makes the direction of easy axis of single domain particle make neat orientations along external magnetic field, and such blank can obtain anisotropic permanent-magnet ferrite through oversintering.The moulding process of permanent-magnet ferrite mainly contains two kinds of dry-pressing and wet pressings, and wherein dry-pressing formed to have a shaping efficiency high, and shrinkage ratio is controlled well and is convenient to production small size and the complex-shaped production advantages such as product.Yet, owing to being subjected to the restriction of process conditions, to compare with the wet pressing product, the pressed Anisotropic ferrite product magnetic property of China is lower, and the space has greatly improved.Along with being gradually improved of China's wet pressing technique, the raising of magnetic property and the raising of rate of finished products, the cost of product constantly descends, the pressure huge to the pressed Anisotropic product composition.Therefore have the magnetic property that improves dry-pressing opposite sex product only, just can hold market, bring into play its production advantage.
Summary of the invention
The object of the invention is to provide multipole ferrite bead of a kind of integral type anisotropy and preparation method thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is:
The multipole ferrite bead of a kind of integral type anisotropy is characterized in that, is made by principal component and accessory ingredient;
Described principal component is 1: 5.5～1: 5.7 Fe by mass ratio
2O
3Form with SrO;
Take the quality sum of all principal components as benchmark, described accessory ingredient comprises 0.35%～0.50% kaolin, 0.40%～0.60% calcium carbonate, 1.0%～5.0% nano inorganic flux;
Described nano inorganic flux is 1～4% coupling agent by inorganic cosolvent with respect to the quality consumption of inorganic cosolvent, ball milling to particle diameter less than the 100nm gained; Described inorganic cosolvent is CuO, Bi
2O
3Or WO
3In the mixture of one or more any proportionings.
Ball milling speed during above-mentioned preparation nano inorganic flux is preferably 200～400rpm, and Ball-milling Time is preferably 8～15 hours.
Described coupling agent is preferably silane coupler, more preferably the mixture of one or more any proportionings in gamma-aminopropyl-triethoxy-silane, γ-acryloxy propyl trimethoxy silicane, APTES, 3-aminopropyl triethoxysilane or the gamma-amino propyl group three ethoxy silane is more preferably a kind of.
Take the quality sum of all principal components as benchmark, described accessory ingredient also comprises 0.8～1.2% camphor, 0.3～0.7% calcium stearate.
The preparation method of the multipole ferrite bead of above-mentioned integral type anisotropy, the same with conventional preparation method, may further comprise the steps: 1, batching; 2, ball milling; 3, pre-burning; 4, secondary prescription; 5, secondary ball milling; 6, premagnetization; 7, dry-pressing formed; 8, sintering 9, grinding 10, check.
The preparation method of the multipole ferrite bead of described integral type anisotropy added the nano inorganic flux in the principal component before a ball milling.
Camphor and calcium stearate preferably add in the secondary ball milling process.
Camphor more preferably was heated to molten state at 150 ℃ to 200 ℃ before adding.
In dry-pressing formed, the ferromagnetic oxide powder after the premagnetization is inserted the annular die group, with the stamping forming while of magnetic, the mould bar in the center imposes size and is 50A to 100A axial current set of molds with axially.Make on the internal diameter of mould bar or die and produce and magnet ring number of poles equal number vertical magnetic field, and adjacent the two poles of the earth consist of magnetic loop, this multipole magnetic field just can form radial oriented effect to ferromagnetic oxide powder, and namely magnet ring is realized the whole multipole radial oriented of magnet ring in the process of integrated punching moulding.Adopt the integrated punching moulding process can realize multi-pole magnet-ring number of poles controllable adjustment by the magnetizing coil design.
The technique that above-mentioned preparation method does not mention all adopts common process.
The multipole ferrite bead of integral type anisotropy of the present invention, remanent magnetism Br 〉=400mT, coercive force H
Cb〉=245kA/m, HCJ H
Cj〉=250kA/m, maximum magnetic energy product (BH)
Max〉=30kJ/m
3
Description of drawings
Fig. 1 is the demagnetization curve figure of the multipole ferrite bead of integral type anisotropy of embodiments of the invention 1;
Embodiment
Specific embodiments of the invention below are described: but the present invention is not limited to these embodiment.
The test mode of remanent magnetism of the present invention, coercive force, HCJ, maximum magnetic energy product: with reference to GB/T 3217-1992 permanent magnetism (Hard Magnetic) magnetism of material test method.
Embodiment 1
Principal component: Fe
2O
3: SrO=1: 5.5; Take the quality sum of principal component as benchmark, kaolin addition: 0.35%; The calcium carbonate addition: 0.60%, nano inorganic flux 1.0% is prepared burden, will join mixture through steps such as ball milling, pre-burning, secondary prescription, secondary ball milling, premagnetization, dry-pressing formed, sintering, grinding, checks.Wherein, the nano inorganic flux is to be 1: 1 Bi with mass ratio
2O
3Powder and Bi
2O
3, and be that 3% DL602 silane coupler carries out high-energy ball milling and obtains with respect to the mass content of inorganic flux, ball milling speed is 400rpm, Ball-milling Time is 10 hours.
In above-mentioned secondary ball milling process, add 1.0wt% camphor as adhesive, add the 0.5wt% calcium stearate as lubricant.Adhesive camphor is molten state through 150 ℃ of heat treated.
Dry-pressing formed process is as follows: will insert the annular die group after this ferromagnetic oxide powder premagnetization, set of molds is with axially with the stamping forming while of magnetic, impose axial current by the mould bar in the center, size of current is 100A, for making the upper vertical magnetic field that produces 24 utmost points of mould bar (the perhaps internal diameter of die), this multipole magnetic field just can form radial oriented effect to ferromagnetic oxide powder, namely obtains the multipole ferrite bead of 24 utmost point integral type anisotropy.
The performance of the above-mentioned multipole ferrite bead of integral type anisotropy that makes after measured, remanent magnetism Br=413mT, coercive force H
Cb=250.0kA/m, HCJ H
Cj=253.8kA/m, maximum magnetic energy product (BH)
Max=33.5kJ/m
3
Embodiment 2
Principal component: Fe
2O
3: SrO=1: 5.7; Take the quality sum of principal component as benchmark, kaolin addition: 0.50%; The calcium carbonate addition: 0.40%, nano inorganic flux 5.0% is prepared burden, will join mixture through steps such as ball milling, pre-burning, secondary prescription, secondary ball milling, premagnetization, dry-pressing formed, sintering, grinding, checks.Wherein, the nano modification flux is with Bi
2O
3And WO
3Powder adds the gamma-aminopropyl-triethoxy-silane that accounts for mixed powder quality 1% and carries out the high-energy ball milling acquisition after mixing by 2: 1 mass ratios, and ball milling speed is 300rpm, and Ball-milling Time is 12 hours.
In above-mentioned secondary ball milling process, add 0.8wt% camphor as adhesive, add the 0.7wt% calcium stearate as lubricant.Adhesive camphor is molten state through 180 ℃ of heat treated.
Dry-pressing formed process is as follows: will insert the annular die group after this ferromagnetic oxide powder premagnetization, set of molds is with axially with the stamping forming while of magnetic, impose axial current by the mould bar in the center, size of current is 80A, for making the upper vertical magnetic field that produces 12 utmost points of mould bar (the perhaps internal diameter of die), this multipole magnetic field just can form radial oriented effect to ferromagnetic oxide powder, namely obtains the multipole ferrite bead of 12 utmost point integral type anisotropy.
The performance of the above-mentioned multipole ferrite bead of integral type anisotropy that makes after measured, remanent magnetism Br=401mT, coercive force H
Cb=254.5kA/m, HCJ H
Cj=258.2kA/m, maximum magnetic energy product (BH)
Max=32.5kJ/m
3
Principal component: Fe
2O
3: SrO=1: 5.6; Take the quality sum of principal component as benchmark, kaolin addition: 0.46%, calcium carbonate addition: 0.53%, nano inorganic flux 5.0% is prepared burden, will join mixture through steps such as ball milling, pre-burning, secondary prescription, secondary ball milling, premagnetization, dry-pressing formed, sintering, grinding, checks.Wherein, the nano modification flux is with CuO, Bi
2O
3, WO
3Powder is pressed: after mass ratio mixed in 1: 1: 1, add the APTES that accounts for mixed powder quality 4% and carry out the high-energy ball milling acquisition, ball milling speed is 300rpm, and Ball-milling Time is 12 hours.
In above-mentioned secondary ball milling process, add 1.2wt% camphor as adhesive, add the 0.3wt% calcium stearate as lubricant.Adhesive camphor is molten state through 180 ℃ of heat treated.
Dry-pressing formed process is as follows: will insert the annular die group after this ferromagnetic oxide powder premagnetization, set of molds is with axially with the stamping forming while of magnetic, impose axial current by the mould bar in the center, size of current is 50A, for making the upper vertical magnetic field that produces 12 utmost points of mould bar (the perhaps internal diameter of die), this multipole magnetic field just can form radial oriented effect to ferromagnetic oxide powder, namely obtains the multipole ferrite bead of 12 utmost point integral type anisotropy.
The performance of the above-mentioned multipole ferrite bead of integral type anisotropy that makes after measured, remanent magnetism Br=410mT, coercive force H
Cb=252.7kA/m, HCJ H
Cj=255.1kA/m, maximum magnetic energy product (BH)
Max=33.4kJ/m
3
Embodiment 4
Principal component: Fe
2O
3: SrO=1: 5.6; Take the quality sum of principal component as benchmark, kaolin addition: 0.46%, calcium carbonate addition: 0.53%, nano inorganic flux 5.0% is prepared burden, will join mixture through steps such as ball milling, pre-burning, secondary prescription, secondary ball milling, premagnetization, dry-pressing formed, sintering, grinding, checks.Wherein, the nano modification flux is with CuO, Bi
2O
3, WO
3Powder is pressed: after mass ratio mixed in 1: 1: 1, add the gamma-amino propyl group three ethoxy silane that account for mixed powder quality 4% and carry out the high-energy ball milling acquisition, ball milling speed is 300rpm, and Ball-milling Time is 12 hours.
In above-mentioned secondary ball milling process, add 1.2wt% camphor as adhesive, add the 0.3wt% calcium stearate as lubricant.Adhesive camphor is molten state through 180 ℃ of heat treated.
Dry-pressing formed process is as follows: will insert the annular die group after this ferromagnetic oxide powder premagnetization, set of molds is with axially with the stamping forming while of magnetic, impose axial current by the mould bar in the center, size of current is 50A, for making the upper vertical magnetic field that produces 12 utmost points of mould bar (the perhaps internal diameter of die), this multipole magnetic field just can form radial oriented effect to ferromagnetic oxide powder, namely obtains the multipole ferrite bead of 12 utmost point integral type anisotropy.
The performance of the above-mentioned multipole ferrite bead of integral type anisotropy that makes after measured, remanent magnetism Br=410mT, coercive force H
Cb=253.1kA/m, HCJ H
Cj=255.4kA/m, maximum magnetic energy product (BH)
Max=34.1kJ/m
3
Claims (9)
1. multipole ferrite bead of integral type anisotropy, it is characterized in that: it is made by principal component and accessory ingredient;
Described principal component is 1: 5.5～1: 5.7 Fe by mass ratio
2O
3Form with SrO;
Take the quality sum of all principal components as benchmark, described accessory ingredient comprises 0.35%～0.50% kaolin, 0.40%～0.60% calcium carbonate and 1.0%～5.0% nano inorganic flux;
Described nano inorganic flux is 1～4% coupling agent by inorganic cosolvent with respect to the quality consumption of inorganic cosolvent, ball milling to particle diameter less than the 100nm gained; Described inorganic cosolvent is CuO, Bi
2O
3Or WO
3In the mixture of one or more any proportionings.
2. the multipole ferrite bead of integral type anisotropy as claimed in claim 1, it is characterized in that: described coupling agent is silane coupler.
3. the multipole ferrite bead of integral type anisotropy as claimed in claim 2, it is characterized in that: described silane coupler is the mixture of one or more any proportionings in gamma-aminopropyl-triethoxy-silane, γ-acryloxy propyl trimethoxy silicane, APTES, 3-aminopropyl triethoxysilane or the gamma-amino propyl group three ethoxy silane.
4. such as the multipole ferrite bead of each described integral type anisotropy in the claims 1 to 3, it is characterized in that: take the quality sum of all principal components as benchmark, described accessory ingredient also comprises 0.8～1.2% camphor, 0.3～0.7% calcium stearate.
5. such as the multipole ferrite bead of each described integral type anisotropy in the claims 1 to 3, it is characterized in that: the ball milling speed of nano inorganic flux is 200～400rpm, and Ball-milling Time is 8～15 hours.
6. the preparation method of the multipole ferrite bead of the described integral type anisotropy of each in the claim 1 to 5, comprise the steps: batching, ball milling, pre-burning, secondary prescription, secondary ball milling, premagnetization, dry-pressing formed, sintering, it is characterized in that, the nano inorganic flux was added in the principal component before a ball milling.
7. the preparation method of the multipole ferrite bead of integral type anisotropy as claimed in claim 6 is characterized in that: camphor and calcium stearate are added in the secondary ball milling process.
8. such as claim
The preparation method of the multipole ferrite bead of described integral type anisotropy is characterized in that: camphor before adding, 150 ℃ to 200 ℃ heating place to molten state.
9. such as the preparation method of the multipole ferrite bead of each described integral type anisotropy in the claim 6 to 8, it is characterized in that: in dry-pressing formed, ferromagnetic oxide powder after the premagnetization is inserted the annular die group, with the stamping forming while of magnetic, the mould bar in the center imposes size and is 50A to 100A axial current set of molds with axially.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435337A (en) * | 2013-08-20 | 2013-12-11 | 韶关西格玛技术有限公司 | Method for improving property of dry pressing isotropic permanent magnetic ferrite |
| CN104058738A (en) * | 2014-07-11 | 2014-09-24 | 辽宁工业大学 | Sintering process method of strontium ferrite |
| CN104392836A (en) * | 2014-09-25 | 2015-03-04 | 中钢集团安徽天源科技股份有限公司 | Manufacturing method of anisotropic high-performance dry-pressed sintered ferrite multi-pole magnetic ring |
| CN104446418A (en) * | 2014-12-11 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for improving remanence and intrinsic coercive force of permanent magnetic ferrite |
| CN104496458A (en) * | 2014-09-22 | 2015-04-08 | 横店集团东磁股份有限公司 | Manufacturing method of dry-pressed anisotropic ferrite magnetic powder |
| CN105895300A (en) * | 2015-07-23 | 2016-08-24 | 南通万宝实业有限公司 | Roasting method of ferric oxide magnetic ring |
| CN104505990B (en) * | 2014-09-15 | 2017-02-15 | 横店集团东磁股份有限公司 | Preparation method for sintering permanent magnetic ferrite ring of brushless motor |
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| CN101599333A (en) * | 2009-04-28 | 2009-12-09 | 横店集团东磁股份有限公司 | Method for manufacturing anisotropic multi-pole magnetic ring by dry pressing |
| CN101752075A (en) * | 2010-02-20 | 2010-06-23 | 南通万宝磁石制造有限公司 | Experimental method for determining use and addition amount of dry Sr ferrite magnetic steel adhesive agents |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435337A (en) * | 2013-08-20 | 2013-12-11 | 韶关西格玛技术有限公司 | Method for improving property of dry pressing isotropic permanent magnetic ferrite |
| CN104058738A (en) * | 2014-07-11 | 2014-09-24 | 辽宁工业大学 | Sintering process method of strontium ferrite |
| CN104058738B (en) * | 2014-07-11 | 2015-08-26 | 辽宁工业大学 | A kind of strontium ferrites sintering process method |
| CN104505990B (en) * | 2014-09-15 | 2017-02-15 | 横店集团东磁股份有限公司 | Preparation method for sintering permanent magnetic ferrite ring of brushless motor |
| CN104496458A (en) * | 2014-09-22 | 2015-04-08 | 横店集团东磁股份有限公司 | Manufacturing method of dry-pressed anisotropic ferrite magnetic powder |
| CN104392836A (en) * | 2014-09-25 | 2015-03-04 | 中钢集团安徽天源科技股份有限公司 | Manufacturing method of anisotropic high-performance dry-pressed sintered ferrite multi-pole magnetic ring |
| CN104446418A (en) * | 2014-12-11 | 2015-03-25 | 湖南航天磁电有限责任公司 | Method for improving remanence and intrinsic coercive force of permanent magnetic ferrite |
| CN104446418B (en) * | 2014-12-11 | 2016-03-30 | 湖南航天磁电有限责任公司 | A kind of method improving permanent magnetic ferrite residual magnetization and HCJ |
| CN105895300A (en) * | 2015-07-23 | 2016-08-24 | 南通万宝实业有限公司 | Roasting method of ferric oxide magnetic ring |
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