CN104607644A - Insulating treatment method for soft magnetic alloy powder core - Google Patents
Insulating treatment method for soft magnetic alloy powder core Download PDFInfo
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- CN104607644A CN104607644A CN201510026903.1A CN201510026903A CN104607644A CN 104607644 A CN104607644 A CN 104607644A CN 201510026903 A CN201510026903 A CN 201510026903A CN 104607644 A CN104607644 A CN 104607644A
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Abstract
The invention provides an insulating treatment method for a soft magnetic alloy powder core. The insulating treatment method comprises the steps of adopting an insulating material with target permeability to conduct coating on the soft magnetic alloy powder core and pressing the soft magnetic alloy powder core to form a magnetic core blank; putting the magnetic core blank into the insulating material to soak, and vacuumizing and keeping vacuumization for three or more minutes; taking out the prepared magnetic core, drying the prepared magnetic core, and conducting annealing treatment. According to the insulating treatment method for the soft magnetic alloy powder core, soft magnetic alloy metal powder is first pressed to form the magnetic core flan after ordinary insulation treatment is conducted, and then further soaking insulation is conducted on the semi-finished product, the insulating material is added to the magnetic core blank and insulation breakdown caused by press forming is repaired without changing the permeability of the magnetic core; vacuum soaking is adopted as the soaking method, and under the condition of returning back to normal atmospheric pressure, the liquid insulating material is forcibly pressed into internal gaps of the magnetic core semi-finished product through atmospheric pressure. By means of the insulating treatment method for the soft magnetic alloy powder core, the magnetic core loss of the soft magnetic alloy powder core is reduced by more than 15%.
Description
Technical field
The invention belongs to fine inorganic chemical technology field, particularly relate to a kind of insulating treatment method of soft magnetic alloy powder core, and the soft magnetic alloy powder core obtained after adopting this insulating treatment method process.
Background technology
Metal soft magnetic material needs to work under alternating magnetic field usually, and therefore material internal can induce alternating electric field, thus produces induced-current at material internal, and namely the energy of electric field is consumed by metal soft magnetic material with the form of eddy-current loss.For reducing the eddy-current loss of metal soft magnetic material, usually need to add the higher element of some resistivity, and metal soft magnetic material is fried batter in a thin layer shape.At some metal soft magnetic alloy of preparation, during as amorphous, nano-crystal soft magnetic alloy, first melt supercooled technology is utilized alloy melt to be prepared into thickness 15 μm ~ 40 μm amorphous ribbons (band resistivity about 130 μ Ω cm), thin coiled stock is coiled into magnetic core, then makes it that there is good soft magnet performance by suitable Technology for Heating Processing.
When magnetic core works at low frequency, due in magnetic core between tape layer eddy current effect less, magnetic core can normally work usually.When magnetic core works (as at more than 20kHz) in high frequency, if the insulation between band lamination is undesirable, interlayer may be communicated with, eddy-current loss is increased and causes the high-frequency loss of whole magnetic core sharply to increase, and every layer of band internal vortex makes to there is very high induced voltage between band lamination, electric discharge phenomena between easy generating layer, cause band lamination breakdown, and even whole magnetic core is burnt.
Therefore, soft-magnetic alloy powder is used for magnetic core, must through powder surface insulation processing.The insulation of metal current powder adopts the methods such as phosphoric acid oxidation, Surface coating inorganic material or organic material usually; If clad material adds too much, easily cause the decline even increase of eddy-current loss of magnetic conductivity, if but clad material is very few, then insulation characterisitic meet less than, eddy-current loss can increase considerably; Insulating materials, in large pressure forming process, easily causes breaking, and makes breaking of insulating materials, and cause the increase of eddy-current loss.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of insulating treatment method of soft magnetic alloy powder core is provided, adopt the core loss after this insulating treatment method process to decline more than 15%.
First aspect of the present invention is to provide a kind of insulating treatment method of soft magnetic alloy powder core, comprises the following steps:
Step 1, first adopts the insulating materials of target magnetic conductivity to carry out coated to magnetically soft alloy powder, and is pressed into magnetic core semifinished product;
Step 2, then puts into liquid insulating material magnetic core semifinished product and soaks, and liquid level covers magnetic core semifinished product;
Step 3, then liquid insulating material is put into vacuum tank together with magnetic core semifinished product, vacuumize, and keep the time of at least 3 minutes;
Step 4, then takes out core material, dries, carries out annealing in process.
Preferably, in step 3, the vacuum after vacuumizing exceedes-0.9 atmospheric pressure.
Preferably, the liquid insulating material described in step 2 be selected from sodium silicate solution, sodium aluminate solution, Ludox, organic silicon emulsion or nano-inorganic substance slurry one or more.
Preferably, described insulating treatment method also comprises step 5: the magnetic core superposition after step 4 being processed, the magnetic core highly increased.Have employed the treating method of sandwich construction superposition, magnetic core height can be solved high and cause inner situation of soaking weak effect.
Second aspect of the present invention is to provide a kind of soft magnetic alloy powder core, obtains after carrying out insulation processing according to the insulating treatment method described in the present invention first aspect.
The present invention at magnetically soft alloy metal dust after common insulation processing, first be pressed into magnetic core semifinished product, and further immersion insulation has been done, when not changing the magnetic conductivity of magnetic core to blank, add insulating materials, and repaired and break because suppressing the insulation that causes; Immersion process have employed vacuum and soaks, and is being returned in normobaric situation, is make use of atmospheric pressure and liquid insulating material is pressed into by force among the internal clearance of magnetic core blank.Adopt insulating treatment method of the present invention, the core loss of soft magnetic alloy powder core declines more than 15%.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further, to understand the present invention better.
Comparative example 1
First soft-magnetic alloy powder system is become magnetic core semifinished product.After getting the silicon carbide powder of 125g particle mean size 50 μm and the alumina powder mixing of 375g particle mean size 200 μm, add in 5kg deionized water the formation suspension that also constantly stirs.Then by obtained magnetic core semifinished product dip-coating 90s in suspension, then dry, both.
Embodiment 1
After getting the silicon carbide powder of 125g particle mean size 50 μm and the alumina powder mixing of 375g particle mean size 200 μm, add in 5kg deionized water the formation suspension that also constantly stirs, by magnetically soft alloy powder dip-coating 90s in suspension, then dry, make insulating materials carry out coated to magnetically soft alloy powder, then make magnetic core semifinished product.
Magnetic core semifinished product is put into organic silicon emulsion soak, liquid level covers magnetic core semifinished product.Again organic silicon solution is put into vacuum tank together with magnetic core semifinished product, vacuumize and make vacuum exceed-0.9 atmospheric pressure, and keep the time of 3 minutes; Then take out core material, dry, carry out annealing in process.
The loss of test magnetic core, under 20kHz, 0.2T, the magnetic core semifinished product that the loss ratio comparative example of the magnetic core that the present embodiment 1 is obtained is obtained reduces 15%.
Embodiment 2
The difference of the present embodiment and embodiment 1 is, soaked by the sodium silicate solution that 1M put into by magnetic core semifinished product, liquid level covers magnetic core semifinished product.Again sodium silicate solution is put into vacuum tank together with magnetic core semifinished product, vacuumize and make vacuum exceed-0.9 atmospheric pressure, and keep the time of 15 minutes; Then take out core material, dry, carry out annealing in process.
The loss of test magnetic core, under 20kHz, 0.2T, the magnetic core semifinished product that the loss ratio comparative example of the magnetic core that the present embodiment 1 is obtained is obtained reduces 18%.
Embodiment 3
The difference of the present embodiment and embodiment 1 is, soaked by the sodium aluminate solution that 1M put into by magnetic core semifinished product, liquid level covers magnetic core semifinished product.Again sodium aluminate solution is put into vacuum tank together with magnetic core semifinished product, vacuumize and make vacuum exceed-0.9 atmospheric pressure, and keep the time of 10 minutes; Then take out core material, dry, carry out annealing in process.
The loss of test magnetic core, under 20kHz, 0.2T, the magnetic core semifinished product that the loss ratio comparative example of the magnetic core that the present embodiment 1 is obtained is obtained reduces 20%.
Embodiment 4
The difference of the present embodiment and embodiment 1 is, magnetic core semifinished product is put into Ludox and soaks, and liquid level covers magnetic core semifinished product.Again Ludox is put into vacuum tank together with magnetic core semifinished product, vacuumize and make vacuum exceed-0.9 atmospheric pressure, and keep the time of 5 minutes; Then take out core material, dry, carry out annealing in process.
The loss of test magnetic core, under 20kHz, 0.2T, the magnetic core semifinished product that the loss ratio comparative example of the magnetic core that the present embodiment 1 is obtained is obtained reduces 17%.
Embodiment 5
The difference of the present embodiment and embodiment 1 is, magnetic core semifinished product is put into nano-inorganic substance slurry and soaks, liquid level covers magnetic core semifinished product.Again nano-inorganic substance slurry is put into vacuum tank together with magnetic core semifinished product, vacuumize and make vacuum exceed-0.9 atmospheric pressure, and keep the time of 6 minutes; Then take out core material, dry, carry out annealing in process.
The loss of test magnetic core, under 20kHz, 0.2T, the magnetic core semifinished product that the loss ratio comparative example of the magnetic core that the present embodiment 1 is obtained is obtained reduces 15%.
Be described in detail specific embodiments of the invention above, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, equalization conversion done without departing from the spirit and scope of the invention and amendment, all should contain within the scope of the invention.
Claims (5)
1. an insulating treatment method for soft magnetic alloy powder core, is characterized in that, comprises the following steps:
Step 1, first adopts the insulating materials of target magnetic conductivity to carry out coated to magnetically soft alloy powder, and is pressed into magnetic core semifinished product;
Step 2, then puts into liquid insulating material magnetic core semifinished product and soaks, and liquid level covers magnetic core semifinished product;
Step 3, then liquid insulating material is put into vacuum tank together with magnetic core semifinished product, vacuumize, and keep the time of at least 3 minutes;
Step 4, then takes out core material, dries, carries out annealing in process.
2. insulating treatment method according to claim 1, is characterized in that, in step 3, the vacuum after vacuumizing exceedes-0.9 atmospheric pressure.
3. insulating treatment method according to claim 1, is characterized in that, the liquid insulating material described in step 2 be selected from sodium silicate solution, sodium aluminate solution, Ludox, organic silicon emulsion or nano-inorganic substance slurry one or more.
4. insulating treatment method according to claim 1, is characterized in that, also comprises step 5: the magnetic core superposition after step 4 being processed, the magnetic core highly increased.
5. a soft magnetic alloy powder core, is characterized in that, obtains after carrying out insulation processing according to the insulating treatment method described in Claims 1 to 4 any one.
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| CN201510026903.1A CN104607644A (en) | 2015-01-19 | 2015-01-19 | Insulating treatment method for soft magnetic alloy powder core |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344993A (en) * | 2015-12-04 | 2016-02-24 | 广东工业大学 | Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing |
| CN105655082A (en) * | 2015-12-31 | 2016-06-08 | 苏州达方电子有限公司 | Inductor, magnetic material composition for inductor and electronic component manufacturing method |
| CN114429857A (en) * | 2020-10-29 | 2022-05-03 | 东莞市铧美电子有限公司 | Diffusion-proof treatment process for alloy material iron core |
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| JP2002008935A (en) * | 1999-11-12 | 2002-01-11 | Sumitomo Special Metals Co Ltd | Method of manufacturing rare-earth magnet |
| CN102789861A (en) * | 2012-08-31 | 2012-11-21 | 哈尔滨工业大学 | Soft magnetic composite material of collosol infiltrating glass powder coating layer and preparation method of soft magnetic composite material |
| CN102820115A (en) * | 2012-08-31 | 2012-12-12 | 哈尔滨工业大学 | Sol soaked glass wrapped layer soft magnetism composite material and preparation method thereof |
| CN102938312A (en) * | 2012-11-14 | 2013-02-20 | 浙江宏伟磁业科技股份有限公司 | Method for manufacturing iron-silicon-aluminium metal magnetic powder core |
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2015
- 2015-01-19 CN CN201510026903.1A patent/CN104607644A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002008935A (en) * | 1999-11-12 | 2002-01-11 | Sumitomo Special Metals Co Ltd | Method of manufacturing rare-earth magnet |
| CN102789861A (en) * | 2012-08-31 | 2012-11-21 | 哈尔滨工业大学 | Soft magnetic composite material of collosol infiltrating glass powder coating layer and preparation method of soft magnetic composite material |
| CN102820115A (en) * | 2012-08-31 | 2012-12-12 | 哈尔滨工业大学 | Sol soaked glass wrapped layer soft magnetism composite material and preparation method thereof |
| CN102938312A (en) * | 2012-11-14 | 2013-02-20 | 浙江宏伟磁业科技股份有限公司 | Method for manufacturing iron-silicon-aluminium metal magnetic powder core |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344993A (en) * | 2015-12-04 | 2016-02-24 | 广东工业大学 | Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing |
| CN105344993B (en) * | 2015-12-04 | 2018-12-28 | 广东工业大学 | A kind of method that temperature and pressure prepare iron-silicon-aluminum soft magnet powder core |
| CN105655082A (en) * | 2015-12-31 | 2016-06-08 | 苏州达方电子有限公司 | Inductor, magnetic material composition for inductor and electronic component manufacturing method |
| CN114429857A (en) * | 2020-10-29 | 2022-05-03 | 东莞市铧美电子有限公司 | Diffusion-proof treatment process for alloy material iron core |
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Application publication date: 20150513 |