CN102360652A - Composite material for direct-current-bias-resistant magnetic core and method for preparing direct-current-bias-resistant magnetic core - Google Patents
Composite material for direct-current-bias-resistant magnetic core and method for preparing direct-current-bias-resistant magnetic core Download PDFInfo
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- CN102360652A CN102360652A CN2011101770522A CN201110177052A CN102360652A CN 102360652 A CN102360652 A CN 102360652A CN 2011101770522 A CN2011101770522 A CN 2011101770522A CN 201110177052 A CN201110177052 A CN 201110177052A CN 102360652 A CN102360652 A CN 102360652A
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Abstract
The invention discloses a composite material for a direct-current-bias-resistant magnetic core. The composite material comprises a soft magnetic material and a permanent magnet material in a mass ratio of (5:5)-(9:1). The prepared magnetic core has better direct-current bias resistance, the volume of the magnetic core can be further reduced, and the application range of the magnetic core is greatly extended.
Description
Technical field
The present invention relates to a kind of magnetic core of anti-the direct current biasing and use composite material.
Background technology
The miniaturization of electronic product; Lightness is the target that electronic industry is pursued always, in the soft magnetism field, no matter which kind of soft magnetic material; The raising of saturation induction density all helps the realization of this target; But because saturation induction density is the intrinsic parameters of material, can't further improve in the application, this makes the limited use of product.In high frequency, high-power applications field, higher magnetic field also makes magnetic core very easily saturated simultaneously, and the means that address this problem at present can only be to increase core volume or reduce the magnetic core magnetic permeability, and these two kinds of means all make the self-characteristic of material can not get fully playing.Investigate existing magnetic core high-power applications environment; Basically all can equivalence be the stack of flip-flop and alternating component, the saturated of magnetic core be then mainly caused by flip-flop, if can eliminate the influence that flip-flop causes; The range of application that makes magnetic core is greatly expanded, the volume of magnetic core is further reduced.The method of accomplishing this purpose in the market mainly is on magnetic core, to open air gap; And the introducing permanent magnet is realized in air gap; Though this method has realized above-mentioned purpose in principle, because air gap place leakage field is serious, the loss that edge effect causes is too big; Not only being prone to influences the magnetic core magnetic characteristic, also is prone to cause the too high lead that burns of air gap place temperature.
Summary of the invention
The purpose of this invention is to provide the preparation method of a kind of magnetic core of anti-the direct current biasing with composite material and the magnetic core of anti-the direct current biasing.
A kind of magnetic core of anti-the direct current biasing is used composite material, and it comprises soft magnetic material and permanent magnetic material, and the mass ratio of soft magnetic material and permanent magnetic material is 5:5-9:1.
Described soft magnetic material is that sendust powder, pure iron, phosphorus content are lower than at least a in iron Si system alloy between 0.5-4.8% of 0.04% mild steel, silicon content, the iron aluminum series alloy that contains aluminium 6-16%, this special alloy of celestial platform, permalloy, soft magnetic ferrite, iron-based non-crystalline alloy, iron nickel base amorphous alloy, co-based amorphous alloy, the nano microcrystalline soft magnetic material.
Described permanent magnetic material is at least a in rare earth permanent-magnetic material, the ferrite permanent-magnet materials.
A kind of preparation method of the magnetic core of anti-the direct current biasing may further comprise the steps:
1) soft magnetic powder and permanent-magnet powder is even according to the mixed of mass ratio 5:5-9:1, and carry out insulation processing with insulating compound;
2) in the powder that insulation processing is crossed, add adhesive;
3) again powder is placed mould compression moulding;
4) obtained magnetic core is carried out annealing in process.
Step 2) in, the addition of adhesive is the 0.2-3% of powder gross mass.
The invention has the beneficial effects as follows: the magnetic core of the present invention's preparation has anti-preferably direct current biasing ability, and the volume of magnetic core is further reduced, greatly the range of application of core extension.
Embodiment
A kind of preparation method of the magnetic core of anti-the direct current biasing may further comprise the steps:
1) soft magnetic powder and permanent-magnet powder is even according to the mixed of mass ratio 5:5-9:1, and carry out insulation processing with insulating compound;
2) in the powder that insulation processing is crossed, add adhesive, the addition of adhesive is the 0.2-3% of powder gross mass;
3) again powder is placed mould compression moulding;
4) obtained magnetic core is carried out annealing in process.
Obtained magnetic core carries out saturated magnetizing at last, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.
Described insulation processing is that insulating compound was that mass concentration is the phosphoric acid solution of 30-40% with powder impregnation in insulating compound 3-4 minute, titanate coupling agent, a kind of in the organic siliconresin.
Adhesive is a kind of in epoxy resin, unsaturated polyester (UP), the polyimides.
Below in conjunction with specific embodiment the present invention is described:
Embodiment 1:
Is that the mixed of 9:1 is even with sendust powder (D50 of powder is 70 μ m) and Nd-Fe-B permanent magnetic powder (Nd-Fe-B powder D50 is 30 μ m) according to mass ratio; And carry out insulation processing with phosphoric acid solution, and adding the agent of epoxy resin gluing again, the amount that is added accounts for 0.2% of powder total weight; Place mould again; With powder pressing forming, and under 700 ℃, carry out annealing in process with the pressure of 20T/cm2, annealing atmosphere is a nitrogen; Obtained magnetic core carries out saturated magnetizing, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.The magnetic flux density in magnetic field of magnetizing is 4T.
Embodiment 2:
Is that the mixed of 8:2 is even with sendust powder (D50 of powder is 70 μ m) and Nd-Fe-B permanent magnetic powder (Nd-Fe-B powder D50 is 30 μ m) according to mass ratio; And carry out insulation processing with phosphoric acid solution, and adding the agent of epoxy resin gluing again, the amount that is added accounts for 1% of powder total weight; Place mould again; With powder pressing forming, and under 700 ℃, carry out annealing in process with the pressure of 20T/cm2, annealing atmosphere is a nitrogen; Obtained magnetic core carries out saturated magnetizing, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.The magnetic flux density in magnetic field of magnetizing is 4T.
Embodiment 3:
Is that the mixed of 7:3 is even with sendust powder (D50 of powder is 70 μ m) and Nd-Fe-B permanent magnetic powder (Nd-Fe-B powder D50 is 30 μ m) according to mass ratio; And carry out insulation processing with phosphoric acid solution, and adding the agent of epoxy resin gluing again, the amount that is added accounts for 1.5% of powder total weight; Place mould again; With powder pressing forming, and under 700 ℃, carry out annealing in process with the pressure of 20T/cm2, annealing atmosphere is a nitrogen; Obtained magnetic core carries out saturated magnetizing, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.The magnetic flux density in magnetic field of magnetizing is 4T.
Embodiment 4:
Is that the mixed of 6:4 is even with sendust powder (D50 of powder is 70 μ m) and Nd-Fe-B permanent magnetic powder (Nd-Fe-B powder D50 is 30 μ m) according to mass ratio; And carry out insulation processing with phosphoric acid solution, and adding the agent of epoxy resin gluing again, the amount that is added accounts for 3% of powder total weight; Place mould again; With powder pressing forming, and under 700 ℃, carry out annealing in process with the pressure of 20T/cm2, annealing atmosphere is an argon gas; Obtained magnetic core carries out saturated magnetizing, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.The magnetic flux density in magnetic field of magnetizing is 4T.
Embodiment 5:
Is that the mixed of 5:5 is even with sendust powder (D50 of powder is 70 μ m) and Nd-Fe-B permanent magnetic powder (Nd-Fe-B powder D50 is 30 μ m) according to mass ratio; And carry out insulation processing with phosphoric acid solution, and adding the unsaturated polyester (UP) adhesive again, the amount that is added accounts for 0.5% of powder total weight; Place mould again; With powder pressing forming, and under 700 ℃, carry out annealing in process with the pressure of 20T/cm2, annealing atmosphere is an argon gas; Obtained magnetic core carries out saturated magnetizing, the D.C. magnetic field that the magnetizing direction of magnetic core and bias current produce in the opposite direction.The magnetic flux density in magnetic field of magnetizing is 4T.
Magnetic core direct current biasing characteristic after magnetizing is as shown in table 1:
Table 1: the magnetic core direct current biasing characteristic after magnetizing
Can know that by table 1 the direct current biasing characteristic of the back magnetic core that magnetizes significantly improves.
Claims (5)
1. the magnetic core of anti-the direct current biasing is used composite material, it is characterized in that: it comprises soft magnetic material and permanent magnetic material, and the mass ratio of soft magnetic material and permanent magnetic material is 5:5-9:1.
2. a kind of magnetic core of anti-direct current biasing the according to claim 1 is used composite material, it is characterized in that: described soft magnetic material is that sendust powder, pure iron, phosphorus content are lower than at least a in iron Si system alloy between 0.5-4.8% of 0.04% mild steel, silicon content, the iron aluminum series alloy that contains aluminium 6-16%, this special alloy of celestial platform, permalloy, soft magnetic ferrite, iron-based non-crystalline alloy, iron nickel base amorphous alloy, co-based amorphous alloy, the nano microcrystalline soft magnetic material.
3. a kind of magnetic core of anti-direct current biasing the according to claim 1 is used composite material, it is characterized in that: described permanent magnetic material is at least a in rare earth permanent-magnetic material, the ferrite permanent-magnet materials.
4. use the method for the described magnetic core of anti-direct current biasing of claim 1, it is characterized in that: may further comprise the steps with the Composite Preparation magnetic core of anti-the direct current biasing:
1) soft magnetic powder and permanent-magnet powder is even according to the mixed of mass ratio 5:5-9:1, and carry out insulation processing with insulating compound;
2) in the powder that insulation processing is crossed, add adhesive;
3) again powder is placed mould compression moulding;
4) obtained magnetic core is carried out annealing in process.
5. a kind of magnetic core of anti-direct current biasing the according to claim 4 is characterized in that: step 2 with the method for the Composite Preparation magnetic core of anti-the direct current biasing) in, the addition of adhesive is the 0.2-3% of powder gross mass.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945720A (en) * | 2012-10-15 | 2013-02-27 | 广州市德珑电子器件有限公司 | Preparation method of sendust core with high direct current bias characteristic |
| CN104992806A (en) * | 2015-07-20 | 2015-10-21 | 深圳顺络电子股份有限公司 | Composite FeSiAl material with 75 magnetic conductivity and manufacturing method for same |
| CN107119174A (en) * | 2017-05-02 | 2017-09-01 | 江苏瑞德磁性材料有限公司 | A kind of method for annealing for improving iron-silicon-aluminum soft magnet powder core direct current biasing performance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645525A (en) * | 2005-01-20 | 2005-07-27 | 横店集团东磁有限公司 | Formula of composite bonded magnet |
| CN101499343A (en) * | 2008-01-29 | 2009-08-05 | 台达电子工业股份有限公司 | Composite soft-magnetic powder material and permanent magnet bias magnetic core |
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2011
- 2011-06-28 CN CN2011101770522A patent/CN102360652A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645525A (en) * | 2005-01-20 | 2005-07-27 | 横店集团东磁有限公司 | Formula of composite bonded magnet |
| CN101499343A (en) * | 2008-01-29 | 2009-08-05 | 台达电子工业股份有限公司 | Composite soft-magnetic powder material and permanent magnet bias magnetic core |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945720A (en) * | 2012-10-15 | 2013-02-27 | 广州市德珑电子器件有限公司 | Preparation method of sendust core with high direct current bias characteristic |
| CN102945720B (en) * | 2012-10-15 | 2016-08-03 | 广州市德珑电子器件有限公司 | A kind of preparation method of high direct current biasing characteristic Fe-Si-Al magnetic core |
| CN104992806A (en) * | 2015-07-20 | 2015-10-21 | 深圳顺络电子股份有限公司 | Composite FeSiAl material with 75 magnetic conductivity and manufacturing method for same |
| CN104992806B (en) * | 2015-07-20 | 2017-07-21 | 深圳顺络电子股份有限公司 | The compound FeSiAl materials and its manufacture method of a kind of magnetic conductivity 75 |
| CN107119174A (en) * | 2017-05-02 | 2017-09-01 | 江苏瑞德磁性材料有限公司 | A kind of method for annealing for improving iron-silicon-aluminum soft magnet powder core direct current biasing performance |
| CN107119174B (en) * | 2017-05-02 | 2021-04-13 | 江苏瑞德磁性材料有限公司 | Annealing method for improving DC bias performance of Fe-Si-Al soft magnetic powder core |
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Address after: 511300, No. three, No. 8, Zeng Jiang Street, Zengcheng, Guangdong, Guangzhou Applicant after: Guangzhou Golden South Plastic Magnet Co., Ltd. Address before: 510640 Guangdong city of Guangzhou province Tianhe District Wushan Jinhui Street No. 88 courtyard Applicant before: Guangzhou Golden South Plastic Magnet Co., Ltd. |
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Application publication date: 20120222 |