CN104795195A - Sendust magnetic powder core - Google Patents
Sendust magnetic powder core Download PDFInfo
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- CN104795195A CN104795195A CN201410240263.XA CN201410240263A CN104795195A CN 104795195 A CN104795195 A CN 104795195A CN 201410240263 A CN201410240263 A CN 201410240263A CN 104795195 A CN104795195 A CN 104795195A
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Abstract
The invention discloses a sendust magnetic powder core. Magnetic powder adopted for the sendust magnetic powder core comprises, by weight, 9-10% of Si, 5-6% of Al, and the balance Fe. Based on the ratio, the sendust magnetic powder core is prepared through powder pre-annealing, screening, passivation, insulation coating, compression moulding forming and heat treatment. According to the sendust magnetic powder core, the sendust magnetic powder core preparing technology is optimized, each preparation step is controlled, and excellent comprehensive performance is realized through the cooperation of all the steps.
Description
Technical field
The invention belongs to powder core technical field, particularly relate to a kind of Fe-Si-Al magnetic core.
Background technology
Along with expanding economy, more and more higher to the requirement of inverter circuit high frequency, miniaturization and electromagnetism interference.Metal magnetic powder core is a kind of soft magnetic material manufactured based on powder metallurgical technique, its advantage in magnetic property, makes to obtain application in many occasions.Wherein, Fe-Si-Al magnetic core has higher cost performance, is subject to the favor in market, and market scale speedup is very fast.In prior art, Fe-Si-Al magnetic core also Shortcomings in magnetic permeability, loss ratio etc., needs to continue to improve.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of Fe-Si-Al magnetic core.
The present invention proposes a kind of Fe-Si-Al magnetic core, the magnetic that described Fe-Si-Al magnetic core uses by weight percentage comprises following component: Si, 9% ~ 10%; Al, 5% ~ 6%; Fe, surplus;
According to above-mentioned magnetic proportioning, prepare Fe-Si-Al magnetic core according to following steps;
S1: powder preannealing; By magnetic at 1000 DEG C of heat treatment 1-1.5h, and pass into H
2as protective gas;
S2: screening; The powder that the magnetic obtained in S1 is respectively 147 μm, 104 μm, 61 μm, 45 μm by aperture is sieved, and mark is got 3 ~ 5% respectively and is 147 μm of powder sieve by aperture and is not that the magnetic, 7 ~ 9% of 104 μm of powder sieves is 104 μm of powder sieves by aperture and is not that the magnetic, 33 ~ 35% of 61 μm of powder sieves is 61 μm of powder sieves by aperture by aperture and the magnetic, 53 ~ 55% being not 45 μm of powder sieves by aperture is 45 μm of powder sieves by aperture that magnetic mixes by aperture by weight, obtains mixing magnetic;
S3: Passivation Treatment; The chromic anhydride that the mixing magnetic obtained in S2 puts into 0.5%-0.8% is soaked 14min ~ 16min, and 190 DEG C ~ 210 DEG C oven dry;
S4: insulating wrapped process, in the magnetic obtained in S3, interpolation 1250 ± 50 object mica powder, silicone resin, absolute ethyl alcohol, tetraethoxysilane mix and add thermal agitation, add zinc stearate, after absolute ethyl alcohol volatilizees completely, take out powder, after placing 20min ~ 30min in atmosphere, sieve the magnetic of sieved insulating wrapped with 30-40 object powder, wherein, the mass ratio of mica powder and magnetic is 0.8 ~ 1.2%;
S5: compression molding; The magnetic obtained in S4 is colded pressing on a hydraulic press, rises to pressurize 1-1.5min 1000MPa ~ 2100MPa pressure with the average rate of pressure rise of 360-400MPa/min from normal pressure, increase with the rising rate of pressure rise of pressure in boost process;
S6: heat treatment; The pressed compact obtained in S5 is put into tube furnace seal, vacuum degree in pipe is evacuated to 10
-3after Pa, be filled with high-purity argon gas protection, rise to 570 DEG C ~ 720 DEG C, in temperature-rise period with the average heating rate of 5-10 DEG C/min, with the rising of temperature, heating rate reduces, insulation 60min ~ 70min, and air cooling, to room temperature, takes out, obtains Fe-Si-Al magnetic core.
Preferably, in S2, take be 147 μm of powder sieve by aperture and not by aperture be 104 μm of powder sieves magnetic, be 104 μm of powder sieves by aperture and not by aperture be 61 μm of powder sieves magnetic, be 61 μm of powder sieves by aperture and not by aperture be 45 μm of powder sieves magnetic, be the magnetic of 45 μm of powder sieves by aperture, mark is respectively 4%, 8%, 34%, 54% by weight.
Preferably, in S4, the mass ratio of mica powder and magnetic is 1%.
Preferably, in S5, rise to pressurize 1min 1600MPa pressure with the average rate of pressure rise of 360MPa/min from normal pressure.
Preferably, in S6, rise to 650 DEG C with the average heating rate of 7 DEG C/min, insulation 70min.
In the present invention, the fineness ratio of conservative control magnetic, thus improve the magnetic powder particle uniformity of being out of shape in follow-up compressing process and harmony, the distortion of lattice that reduction produces under pressure and internal stress, and utilize fine grain magnetic to fill up the space of coarse granule magnetic formation, improve the density of pressing magnetic body, simultaneously, coarsegrain magnetic is utilized to promote the characteristic of powder core magnetic permeability and the characteristic of small grain size magnetic reduction powder core loss, the magnetic permeability of overall balance powder core and loss; Organic and that inorganic insulation is coated method is adopted to carry out insulating wrapped to magnetic, on the one hand can by coated for magnetic, to intercept the eddy current between powder core, thus reduce the eddy current loss of powder core, magnetic can be made to bond in compacting subsequently and heat treatment step on the other hand, promote density and the intensity of pressed compact; In compression molding process, conservative control briquetting pressure, can obtain the powder core of higher density on the one hand, on the other hand, prevents the inner dislocation of magnetic too much, the excessive penalty causing powder core of internal stress; Pass through heat treatment, be conducive to eliminating the internal stress that magnetic produces in compression molding process, improve the electromagnetic property of powder core, simultaneously, be conducive to the intensity improving powder core, and by the control to heat treatment temperature, insulating barrier scorification can be prevented, cause the decomposition of dielectric and the destruction of insulation film, prevent eddy current loss from increasing; Thus, by the cooperation of the control and each step of being prepared by powder core to each step, powder core is made to obtain excellent combination property.
Embodiment
Below in conjunction with instantiation, the present invention is described in detail; should understand; embodiment is only for illustration of the present invention, instead of for limiting the present invention, any amendment, equivalent replacement etc. made on basis of the present invention is all in protection scope of the present invention.
Fe-Si-Al magnetic core disclosed in this invention, the magnetic that described Fe-Si-Al magnetic core uses by weight percentage comprises following component: Si, 9% ~ 10%; Al, 5% ~ 6%; Fe, surplus.
Above-mentioned magnetic can lay a good foundation for the Fe-Si-Al magnetic core preparing combination property good.
Now the concrete preparation method of each embodiment is described.
Embodiment 1
According to above-mentioned magnetic proportioning, prepare Fe-Si-Al magnetic core according to following steps;
S1: powder preannealing; By magnetic at 1000 DEG C of heat treatment 1h, and pass into H
2as protective gas;
S2: screening; The powder that the magnetic obtained in S1 is respectively 147 μm, 104 μm, 61 μm, 45 μm by aperture is sieved, and mark is got 3% respectively and is 147 μm of powder sieve by aperture and is not that the magnetic, 9% of 104 μm of powder sieves is 104 μm of powder sieves by aperture and is not that the magnetic, 35% of 61 μm of powder sieves is 61 μm of powder sieves by aperture by aperture and the magnetic, 53% being not 45 μm of powder sieves by aperture is 45 μm of powder sieves by aperture that magnetic mixes by aperture by weight, obtains mixing magnetic;
S3: Passivation Treatment; The chromic anhydride that the mixing magnetic obtained in S2 puts into 0.6% is soaked 16min, and 210 DEG C of oven dry;
S4: insulating wrapped process, add 1200 object mica powder in the magnetic obtained in S3, silicone resin, absolute ethyl alcohol, tetraethoxysilane mix and add thermal agitation, add zinc stearate, after absolute ethyl alcohol volatilizees completely, take out powder, after placing 20min in atmosphere, with the magnetic of the sieved insulating wrapped of 30 object powder, wherein, the mass ratio of mica powder and magnetic is 0.8%;
S5: compression molding; Colded pressing on a hydraulic press by the magnetic obtained in S4, rise to pressurize 1.5min 1100MPa pressure from normal pressure with the average rate of pressure rise of 360MPa/min, in boost process, with the rising of pressure, rate of pressure rise increases;
S6: heat treatment; The pressed compact obtained in S5 is put into tube furnace seal, vacuum degree in pipe is evacuated to 10
-3after Pa, be filled with high-purity argon gas protection, rise to 580 DEG C, in temperature-rise period with the average heating rate of 7 DEG C/min, with the rising of temperature, heating rate reduces, insulation 70min, and air cooling, to room temperature, takes out, obtains Fe-Si-Al magnetic core.
Embodiment 2
According to above-mentioned magnetic proportioning, prepare Fe-Si-Al magnetic core according to following steps;
S1: powder preannealing; By magnetic at 1000 DEG C of heat treatment 1.5h, and pass into H
2as protective gas;
S2: screening; The powder that the magnetic obtained in S1 is respectively 147 μm, 104 μm, 61 μm, 45 μm by aperture is sieved, and mark is got 4% respectively and is 147 μm of powder sieve by aperture and is not that the magnetic, 8% of 104 μm of powder sieves is 104 μm of powder sieves by aperture and is not that the magnetic, 34% of 61 μm of powder sieves is 61 μm of powder sieves by aperture by aperture and the magnetic, 54% being not 45 μm of powder sieves by aperture is 45 μm of powder sieves by aperture that magnetic mixes by aperture by weight, obtains mixing magnetic;
S3: Passivation Treatment; The chromic anhydride that the mixing magnetic obtained in S2 puts into 0.8% is soaked 14min, and 190 DEG C of oven dry;
S4: insulating wrapped process, add 1300 object mica powder in the magnetic obtained in S3, silicone resin, absolute ethyl alcohol, tetraethoxysilane mix and add thermal agitation, add zinc stearate, after absolute ethyl alcohol volatilizees completely, take out powder, after placing 25min in atmosphere, with the magnetic of the sieved insulating wrapped of 40 object powder, wherein, the mass ratio of mica powder and magnetic is 1%;
S5: compression molding; Colded pressing on a hydraulic press by the magnetic obtained in S4, rise to pressurize 1.2min 1600MPa pressure from normal pressure with the average rate of pressure rise of 380MPa/min, in boost process, with the rising of pressure, rate of pressure rise increases;
S6: heat treatment; The pressed compact obtained in S5 is put into tube furnace seal, vacuum degree in pipe is evacuated to 10
-3after Pa, be filled with high-purity argon gas protection, rise to 650 DEG C, in temperature-rise period with the average heating rate of 8 DEG C/min, with the rising of temperature, heating rate reduces, insulation 70min, and air cooling, to room temperature, takes out, obtains Fe-Si-Al magnetic core.
Embodiment 3
According to above-mentioned magnetic proportioning, prepare Fe-Si-Al magnetic core according to following steps;
S1: powder preannealing; By magnetic at 1000 DEG C of heat treatment 1h, and pass into H
2as protective gas;
S2: screening; The powder that the magnetic obtained in S1 is respectively 147 μm, 104 μm, 61 μm, 45 μm by aperture is sieved, and mark is got 5% respectively and is 147 μm of powder sieve by aperture and is not that the magnetic, 7% of 104 μm of powder sieves is 104 μm of powder sieves by aperture and is not that the magnetic, 33% of 61 μm of powder sieves is 61 μm of powder sieves by aperture by aperture and the magnetic, 55% being not 45 μm of powder sieves by aperture is 45 μm of powder sieves by aperture that magnetic mixes by aperture by weight, obtains mixing magnetic;
S3: Passivation Treatment; The chromic anhydride that the mixing magnetic obtained in S2 puts into 0.5% is soaked 15min, and 200 DEG C of oven dry;
S4: insulating wrapped process, add 1250 object mica powder in the magnetic obtained in S3, silicone resin, absolute ethyl alcohol, tetraethoxysilane mix and add thermal agitation, add zinc stearate, after absolute ethyl alcohol volatilizees completely, take out powder, after placing 30min in atmosphere, with the magnetic of the sieved insulating wrapped of 40 object powder, wherein, the mass ratio of mica powder and magnetic is 1.2%;
S5: compression molding; Colded pressing on a hydraulic press by the magnetic obtained in S4, rise to pressurize 1min 2000MPa pressure from normal pressure with the average rate of pressure rise of 400MPa/min, in boost process, with the rising of pressure, rate of pressure rise increases;
S6: heat treatment; The pressed compact obtained in S5 is put into tube furnace seal, vacuum degree in pipe is evacuated to 10
-3after Pa, be filled with high-purity argon gas protection, rise to 710 DEG C, in temperature-rise period with the average heating rate of 9 DEG C/min, with the rising of temperature, heating rate reduces, insulation 60min, and air cooling, to room temperature, takes out, obtains Fe-Si-Al magnetic core.
In embodiment 1-3, the properties of the Fe-Si-Al magnetic core that test is obtained, performance data is as shown in table 1.
| Magnetic permeability/(H/m) (50kHz, 0.05T) | Loss/(W/cm 3)(50kHz，0.05T) | |
| Embodiment 1 | 138 | 68 |
| Embodiment 2 | 131 | 57 |
| Embodiment 3 | 127 | 54 |
In above-mentioned table 1, data show, powder core disclosed in this invention has good combination property.
Claims (5)
1. a Fe-Si-Al magnetic core, is characterized in that, the magnetic that described Fe-Si-Al magnetic core uses by weight percentage comprises following component: Si, 9% ~ 10%; Al, 5% ~ 6%; Fe, surplus;
According to above-mentioned magnetic proportioning, prepare Fe-Si-Al magnetic core according to following steps;
S1: powder preannealing; By magnetic at 1000 DEG C of heat treatment 1-1.5h, and pass into H
2as protective gas;
S2: screening; The powder that the magnetic obtained in S1 is respectively 147 μm, 104 μm, 61 μm, 45 μm by aperture is sieved, and mark is got 3 ~ 5% respectively and is 147 μm of powder sieve by aperture and is not that the magnetic, 7 ~ 9% of 104 μm of powder sieves is 104 μm of powder sieves by aperture and is not that the magnetic, 33 ~ 35% of 61 μm of powder sieves is 61 μm of powder sieves by aperture by aperture and the magnetic, 53 ~ 55% being not 45 μm of powder sieves by aperture is 45 μm of powder sieves by aperture that magnetic mixes by aperture by weight, obtains mixing magnetic;
S3: Passivation Treatment; The chromic anhydride that the mixing magnetic obtained in S2 puts into 0.5%-0.8% is soaked 14min ~ 16min, and 190 DEG C ~ 210 DEG C oven dry;
S4: insulating wrapped process, in the magnetic obtained in S3, interpolation 1250 ± 50 object mica powder, silicone resin, absolute ethyl alcohol, tetraethoxysilane mix and add thermal agitation, add zinc stearate, after absolute ethyl alcohol volatilizees completely, take out powder, after placing 20min ~ 30min in atmosphere, sieve the magnetic of sieved insulating wrapped with 30-40 object powder, wherein, the mass ratio of mica powder and magnetic is 0.8 ~ 1.2%;
S5: compression molding; The magnetic obtained in S4 is colded pressing on a hydraulic press, rises to pressurize 1-1.5min 1000MPa ~ 2100MPa pressure with the average rate of pressure rise of 360-400MPa/min from normal pressure, increase with the rising rate of pressure rise of pressure in boost process;
S6: heat treatment; The pressed compact obtained in S5 is put into tube furnace seal, vacuum degree in pipe is evacuated to 10
-3after Pa, be filled with high-purity argon gas protection, rise to 570 DEG C ~ 720 DEG C, in temperature-rise period with the average heating rate of 5-10 DEG C/min, with the rising of temperature, heating rate reduces, insulation 60min ~ 70min, and air cooling, to room temperature, takes out, obtains Fe-Si-Al magnetic core.
2. Fe-Si-Al magnetic core according to claim 1, it is characterized in that, in S2, take be 147 μm of powder sieve by aperture and not by aperture be 104 μm of powder sieves magnetic, be 104 μm of powder sieves by aperture and not by aperture be 61 μm of powder sieves magnetic, be 61 μm of powder sieves by aperture and not by aperture be 45 μm of powder sieves magnetic, be the magnetic of 45 μm of powder sieves by aperture, mark is respectively 4%, 8%, 34%, 54% by weight.
3. Fe-Si-Al magnetic core according to claim 1, is characterized in that, in S4, the mass ratio of mica powder and magnetic is 1%.
4. Fe-Si-Al magnetic core according to claim 1, is characterized in that, in S5, rises to pressurize 1min 1600MPa pressure from normal pressure with the average rate of pressure rise of 360MPa/min.
5. Fe-Si-Al magnetic core according to claim 1, is characterized in that, in S6, rises to 650 DEG C with the average heating rate of 7 DEG C/min, insulation 70min.
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|---|---|---|---|
| CN201410240263.XA CN104795195A (en) | 2014-05-30 | 2014-05-30 | Sendust magnetic powder core |
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Cited By (6)
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|---|---|---|---|---|
| CN106521312A (en) * | 2016-11-01 | 2017-03-22 | 电子科技大学 | Method for preparing FeSiAl-series alloy micro powder electromagnetic absorbent |
| CN107030279A (en) * | 2017-03-21 | 2017-08-11 | 海安南京大学高新技术研究院 | Iron-based magnetic insulating coating method |
| CN107414089A (en) * | 2017-07-20 | 2017-12-01 | 上海交通大学 | A kind of Fe-Si-Al magnetic and preparation method thereof |
| CN108777227A (en) * | 2018-04-25 | 2018-11-09 | 天长市中德电子有限公司 | A kind of preparation method of low-loss Fe-Si-Al magnetic core |
| CN110246679A (en) * | 2019-07-31 | 2019-09-17 | 合肥工业大学 | A kind of metal soft magnetic powder core preparation method based on organic/inorganic compound inslation technique |
| CN111696747A (en) * | 2020-07-15 | 2020-09-22 | 中钢集团南京新材料研究院有限公司 | Low-loss Fe-Si-Al soft magnetic powder core and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106521312A (en) * | 2016-11-01 | 2017-03-22 | 电子科技大学 | Method for preparing FeSiAl-series alloy micro powder electromagnetic absorbent |
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| CN108777227A (en) * | 2018-04-25 | 2018-11-09 | 天长市中德电子有限公司 | A kind of preparation method of low-loss Fe-Si-Al magnetic core |
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| CN110246679A (en) * | 2019-07-31 | 2019-09-17 | 合肥工业大学 | A kind of metal soft magnetic powder core preparation method based on organic/inorganic compound inslation technique |
| CN110246679B (en) * | 2019-07-31 | 2020-12-22 | 合肥工业大学 | Preparation method of metal soft magnetic powder core based on organic/inorganic composite insulation process |
| CN111696747A (en) * | 2020-07-15 | 2020-09-22 | 中钢集团南京新材料研究院有限公司 | Low-loss Fe-Si-Al soft magnetic powder core and preparation method thereof |
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