CN1020216C - Making method of cutting amorphous inductive magnetic core - Google Patents
Making method of cutting amorphous inductive magnetic core Download PDFInfo
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- CN1020216C CN1020216C CN 89106983 CN89106983A CN1020216C CN 1020216 C CN1020216 C CN 1020216C CN 89106983 CN89106983 CN 89106983 CN 89106983 A CN89106983 A CN 89106983A CN 1020216 C CN1020216 C CN 1020216C
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- magnetic core
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Abstract
The present invention belongs to a fabrication process for a soft-magnetic amorphous material and a magnetic core. An iron base amorphous band containing 0 to 4 of Me, 3.5 to 12 of Si, 13 to 16 of B, 0 to 2 of C and Fe as the rest is coiled into a magnetic core, and then the magnetic core is enveloped, solidified and shaped by epoxy resin after the annealing procedure is carried out at the temperature of 430 DEG C; subsequently, gas gap cutting is carried out to make the magnetic core into a cutting non crystalline state inductance magnetic core. The average direct-current magnetoconductivity of the magnetic core of which the saturated magnetic induction Bs is 1.45T and the biggest constant-conductance magnetic field Hmax is 40 A/cm is 240, and the loss P2/20K is equal to 4 W/kg. Moreover, the magnetic core has the excellent frequency characteristics, and the working frequency is from 1KH-[2] to 200KH-[2]. The biggest constant-conductance magnetic field Hmax can be changed within range of 10 to 80 A/cm by controlling the width of gas gap. The magnetic core replaces a ferrite and a magnetic powder core, which can reduce the volume by 50 to 75%.
Description
The invention belongs to the manufacture method of soft magnetic amorphous attitude magnetic core.
In the past, as the wide permanent magnetic conduction magnetic core of High frequency filter and energy storage device, used ferrite, magnetic core and the perm constant permeable alloy of band air gap usually.Because the saturated magnetic strength B of ferrite
sLow (＜0.5T), it is the same with the magnetic core, and its linear permeability is less, and for example the permeability of FeSiAl powder core only is 75.6 * 10
-6H/M(60GS/Oe), under the condition of identical parameters, the volume weight of this powder core and FERRITE CORE is bigger, and high-frequency loss is higher, has shortcomings such as the work temperature rise is big.
On the other hand, the domestic wide permanent magnetic conduction permalloy magnetic core of common employing in some important electronic equipments at present, the trade mark is 1J34KH and 1J50H, its Daheng magnetic conduction magnetic field is respectively 16 and 18A/cm, but the perseverance of between is led material and is still belonged to blank, and the Daheng magnetic conduction magnetic field that universal demand is suitable in the electronic installation now is about 40A/cm.The major defect of perm constant permeable alloy is that resistivity is little, and high-frequency loss is bigger, is only applicable to use under the operating frequency condition less than 20KHz.
Beginning in 1984 has occurred using amorphous alloy to make the inductance core with permanent permeance in succession.
In existing amorphous magnetic core manufacturing technology, existing following three kinds of methods can make amorphous alloy obtain permanent permeance.Wherein one of method is as British patent GB2139008A[1] as described in, it is had carry out the epoxide resin vacuum dipping after the non-crystaline amorphous metal magnetic core annealing of direct magnetostriction and solidify, make magnetic core become the integral body of scleroma owing to infiltrated resin between sheet, this compression that produces during just because of sclerosis, make coiling magnetic core its inductance value under low bias current condition be unlikely rapid decline, obtained accurate permanent permeance.But the shortcoming of this magnetic core is because Stress in Magnetic Core is big, causes magnetic strength value and permeability significantly to reduce, and coercive force and core loss are increased, because magnetic permeability is non-linear with respect to magnetic field, is unsuitable for requiring the application scenario of linear permeability.Another method such as patent JP59-181504A[2] be to adopt partially-crystallized annealing and resin impregnation to solidify complex method, this method is utilized partially-crystallized too and is solidified the stress that produces, the shortcoming that has first method equally, and partially-crystallized annealing process is restive, is difficult to obtain stable magnetic characteristic.
The third method [3] of US4834814 is similar to the method that [2] are mentioned, magnetic core after promptly at first will annealing carries out vacuum impregnation in the resin of good fluidity, make resin infilter the belt surface of magnetic core inside, heating cure then, make it to become the integral body of a sclerosis, carry out the air gap cutting at last, obtain in wide magnetic field range, to have linear permanent permeance.But there is the problem of solidifying after-hardening stress too in this method, and it has caused the magnetic strength value B of annealing magnetic core
10With declining to a great extent and coercive force H of magnetic permeability mu m
cIncrease with core loss P.Common B
10Value descends 15～20%, and the decline of μ m value is about 75～80%, H
cIncrease about 5～10 times with the P value.
The objective of the invention is to overcome in above-mentioned three kinds of prior aries stress to the harmful effect of magnetic core soft magnetic characteristic, seek a kind of stable magnetic core curing process manufacture method, when making the annealing magnetic core keep original good soft magnetic characteristic, obtain in the wide magnetic field range of difference (the permanent magnetic conduction feature that has good linear in 0～80A/cm) by the air gap cutting.
Along with electronic device in the rapid progress aspect high frequencyization and the miniaturization and, magnetic core as some inductance components, for example, differential mode noise filter in the Switching Power Supply, the smothing filtering flow vibration coil, resonant inductance and energy storage inductance etc. also have high saturated magnetic strength, high magnetic conduction and low-coercivity and low soft magnetic characteristics such as high-frequency loss when all requiring magnetic core to have wide permanent permeance.
The present invention uses iron-based non-crystalline alloy as core material, adopt special magnetic core adhesive solidification method to be cut into the permanent permeance of Daheng magnetic conduction field by 16 to 80A/cm variable ranges by air gap, and have various amorphous inductance cores of good soft magnet performance, the saturated magnetic strength B of magnetic core
100Being 1.45T, is the inferior magnetic core of 40A/cm retaining for Hm, and its linear permeability is 275 * 10
-6H/M(220GS/Oe).Coercive force H
cLess than 0.12A/cm, the core loss under the condition of 0.05T magnetic strength and 20KHz frequency is 3.0W/kg, and the magnetic core product of this development is specially adapted to the device that the filtering of working under 5KHz～250KHz frequency and energy storage inductance and other requirement have linear magnetic.
Alloy composition scope of the present invention is (at%)
Si：3.5～12
B：12～16
C：0～2.0
Me（Me＝Ni、Mo、Cr）0～4
Fe: surplus
Interpolation alloying element Me can improve the permeability and the high frequency characteristics of material.Si and B element are used as the amorphous forming element.
The employing single-roller method is made the amorphous band of Rack, scratches to circularize or the rectangle magnetic core, carries out annealing in process subsequently under the protection of nitrogen or argon gas.
The annealing process that the present invention adopts is 420～440 ℃, be incubated 0.5～2 hour, under greater than 40 ℃/minute speed, be cooled to room temperature then, also can adopt horizontal magnetic anneal method in addition, horizontal magnetic external magnetic field intensity should be greater than 300A/cm, and its annealing process is same as described above, because the non-crystalline material fragility after the annealing is bigger, and interlayer do not have bonding, should not directly carry out the air gap cutting.
Content of the present invention is to adopt resin envelope magnetic core, makes it curing molding.At first carry out the preparation of resin by following proportioning:
Kind allocation ratio (weight)
Epoxy resin 100
Curing agent 8～16
Increase sword agent 5～30
Filler 30～50
Magnetic core put into give resin that the mould neutrality that is heated to 40～60 ℃ of temperature earlier is about to mix up and inject space between mould and the magnetic core, put into dryer after the injection and be cured processing, its curing process is 150 ℃ and kept three hours.
Resin envelope method of the present invention does not require vacuum impregnation, only needs magnetic core to be put into injection mold or put into special-purpose plastics and protect box, can carry out resin dosing equipment under atmosphere.The Resin Flow of perfusion must be moderate, to guarantee that resin can not penetrate between the lamella of magnetic core inside, only carries out the envelope sclerosis at the magnetic core peripheral surface, so that solidifying, magnetic core is combined into integral body, solidify the stress that produces like this, only reach the solid shape effect, so that the cutting of air gap subsequently.This stress is less to the deterioration effect of soft magnetic characteristic, makes the B of annealing magnetic core usually
sReduce by 1～4%, μ
mReduce by 10～25%,, H
cOnly increase by 5～20%.
In order to reduce the deleterious effects of envelope solidification internal stress, when modulation perfusion resin proportioning, added 5～30% the filler that increases sword agent and 30～50% especially, to guarantee that solidifying the back produces less stress to soft magnetic characteristic.
Magnetic core after solidifying needs for annular or rectangle magnetic core, can make single air gap in the cutting of the enterprising promoting the circulation of qi of cutting machine crack, also can make two air gaps.
The width of cutting air gap needs to be determined that according to the numerical value of permanent magnetic conduction field width degree and the length of magnetic path of magnetic core the width of air gap size range of its single air gap is 0.4mm～3.0mm.
The inductance core of making as stated above has good comprehensive magnetic characteristic, promptly high saturated magnetic strength value, good alternating current-direct current superimposed characteristics and low high-frequency loss value.Fig. 1 shows the magnetic conduction field H of Daheng
mBe the typical static hysteresis line of 40A/cm retaining time magnetic core, its saturated magnetic strength B
mBe the linear permeability 300 * 10 of 1.46T direct current
-6H/M(240GS/Oe).
Fig. 2 shows that the longitudinal axis is the relative change rate of magnetic core inductance value in the typical alternating current-direct current superimposed characteristics curve chart, and transverse axis is the D.C. magnetic biasing number of ampere turns, and magnetic core is of a size of internal diameter 16mm, external diameter 26mm, height mm, the wide 0.6mm of air gap.According to the instructions for use difference, adopt different cutting air gaps can make the magnetic conduction field H of Daheng of magnetic core of the present invention
MaxBe controlled at interior variation of scope of 10～80A/cm.
Magnetic core of the present invention has following characteristics:
1, than prior art obviously good soft magnetic characteristic, promptly high saturated magnetic strength, high permeability, low coercive force and low high-frequency loss are arranged.
2, it can satisfy the requirement of the linear applications of some occasions such as resonant inductance to have obviously good permeability linear characteristic (Fig. 1) than prior art.
3, use the resin envelope, the operation of resin solidification and cutting is simpler than the method for prior art with equipment, and technology and performance have good one stability of making peace when producing in batches.
Smelt mother metal with vacuum furnace, its chemical analysis is Fe
77Si
7B
13C
2(at%), make the wide amorphous band of 15mm with single-roller method, volume is scratched into Φ 40/64 * 15 toroidal core; after the argon shield annealing furnace of 430 ℃ of 1hr is cold; adopt above-mentioned method to carry out epoxy perfusion and curing, cut into the wide air gap of 2.5mm then, its final magnetic is B
s=1.45T, direct current permeability 250～300 * 10
-6H/M(200～240GS/Oe), P0.5/20K(B
m=0.05T, f=20KHz)=3.2～4.8W/kg, Daheng magnetic conduction field is 40A/cm.
Embodiment 2
Use vacuum furnace to smelt mother metal, its chemical analysis is Fe
77Mo
2Si
5B
16(at%), with the magnetic core that the single-roller method system roll coil of strip is scratched into Φ 25/32 * 5, (horizontal magnetic magnetic field is greater than 300A/cm) is cured as stated above behind the horizontal magnetic anneal of 430 ℃ * 1hr, cuts the wide air gap of 0.5mm then.
The final magnetic that obtains is B
s=1.4T, the direct current magnetic permeability mu is 685 * 10
-6H/M(540GS/Oe) the D.C. magnetic biasing of 16A/cm after the match the interchange permeability of 1KHz be 610 * 10
-6H/M(490GS/Oe), at B
mThe core loss of=0.05T, f=20KHz is 2.51W/kg.Daheng magnetic conduction field is 20A/cm.
Claims (3)
1, the manufacture method of soft magnetic amorphous attitude magnetic core; the chemical analysis of its magnetic core (at%) is Si3.5～12.0, B12.0～16.0, C0～2.0, Me (Me=Ni, Mo, Cr) 0～4.0, Fe surplus; use the mother metal of vacuum metling; make the amorphous band of Rack with single-roller method; coiled annular or rectangle magnetic core; under protective atmosphere, carry out annealing in process then; it is characterized in that adopting the low stress resin solidification moulding of magnetic core surface envelope; carry out the air gap cutting then, the width of air gap scope is 0.4～3.0mm.
2, by the described method for making of claim 1, it is characterized in that the proportioning (weight) of resin is: epoxy resin 100, curing agent 8～16 increases sword agent 5～30 fillers 30～50.
3,, it is characterized in that curing molding is treated to 150 ℃ and kept 3 hours by the described method for making of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106983 CN1020216C (en) | 1989-09-03 | 1989-09-03 | Making method of cutting amorphous inductive magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106983 CN1020216C (en) | 1989-09-03 | 1989-09-03 | Making method of cutting amorphous inductive magnetic core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050108A CN1050108A (en) | 1991-03-20 |
| CN1020216C true CN1020216C (en) | 1993-03-31 |
Family
ID=4857003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106983 Expired - Fee Related CN1020216C (en) | 1989-09-03 | 1989-09-03 | Making method of cutting amorphous inductive magnetic core |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2082061C (en) * | 1991-03-04 | 1998-08-18 | Masato Takeuchi | Method of manufacturing and applying heat treatment to a magnetic core |
| CN100432266C (en) * | 2005-11-01 | 2008-11-12 | 王青松 | Amorphous/amorphous nano structured alloy |
| CN100490028C (en) * | 2005-12-07 | 2009-05-20 | 安泰科技股份有限公司 | Block-shaped soft magnetic alloy lamination element and its manufacturing method |
| CN101369771B (en) * | 2007-08-17 | 2011-12-14 | 力博特公司 | ARCP soft switch circuit |
| CN102426912A (en) * | 2011-12-01 | 2012-04-25 | 安徽迪维乐普非晶器材有限公司 | Process for producing transformer iron core |
| CN102509603B (en) * | 2011-12-31 | 2015-10-07 | 青岛云路新能源科技有限公司 | Iron-based amorphous state soft magnetic material and preparation method thereof |
| CN103151133B (en) * | 2013-03-18 | 2015-05-06 | 合肥工业大学 | Preparation technology of high-performance amorphous nickel-based anti-theft iron core |
| CN104200982A (en) * | 2014-03-28 | 2014-12-10 | 北京冶科磁性材料有限公司 | Manufacturing method of nanocrystalline magnetic core for high-frequency electrostatic dust collection power transformer |
| CN105788825A (en) * | 2016-05-17 | 2016-07-20 | 江阴市晶磁电子有限公司 | Impregnation solidification type amorphous iron core and preparation method thereof |
| CN110160693A (en) * | 2019-07-08 | 2019-08-23 | 无锡集磁科技有限公司 | The measuring method of orientation silicon steel magnetic core resin solidification stress |
| CN112281060B (en) * | 2020-10-21 | 2022-07-01 | 江苏大磁纳米材料有限公司 | Tube sealing hydrogenation heat treatment annealing process |
| CN115036125B (en) * | 2022-06-27 | 2023-05-09 | 中国科学院空间应用工程与技术中心 | Nanocrystalline magnetic core, preparation method thereof and magnetic equipment |
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1989
- 1989-09-03 CN CN 89106983 patent/CN1020216C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1050108A (en) | 1991-03-20 |
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