CN104392817A - Fe-Si magnetic powder core with low magnetic core loss and preparation method of Fe-Si magnetic powder core - Google Patents
Fe-Si magnetic powder core with low magnetic core loss and preparation method of Fe-Si magnetic powder core Download PDFInfo
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- CN104392817A CN104392817A CN201410744002.1A CN201410744002A CN104392817A CN 104392817 A CN104392817 A CN 104392817A CN 201410744002 A CN201410744002 A CN 201410744002A CN 104392817 A CN104392817 A CN 104392817A
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Abstract
The invention discloses a Fe-Si magnetic powder core with low magnetic core loss and a preparation method of the Fe-Si magnetic powder core. According to the method, SiO2 successfully wraps a Fe-Si powder core, the magnetic core loss of the Fe-Si powder core can be about 614mW/cm(3) to a minimum extent, and the magnetic powder core has high direct-current bias characteristics and high heat stability. The Fe-6.5Si low-loss magnetic powder core can be applied to design and application of heavy-load inductors such as frequency converters powered by new energy (solar energy, wind energy and the like), power factor correctors and UPS (uninterrupted power supplies).
Description
Technical field
The present invention relates to powder core of a kind of low loss characteristic and preparation method thereof.
Background technology
Powder core ferromagnetic powder is mixed a kind of compound soft magnetic material suppressed.Compared with soft magnetic metal, there is the feature of low eddy current loss; Compared with soft magnetic ferrite, there is again higher saturation induction density.Therefore, powder core is the novel soft magnetic material of one at present with good combination property.
The main feature of Fe-Si powder core is that saturation induction density is high, core loss is lower than ferrocart core, has excellent direct current biasing performance.In addition, Fe-Si powder core also has good temperature stability and high-energy storage capability.
The covering that in invention CN 102314986 A and CN 103824670 A, Fe-Si powder core adopts is phenolic resins.Because the fusing point of organic coating agent is low, adopt the powder core of this covering can not carry out high-temperature heat treatment to eliminate internal stress.The Fe-Si core loss that in invention CN 103700460 A prepared by inorganic coating is still higher, is 2000 mW/cm
3left and right (test condition 100 kHz, 100 mT).
Summary of the invention
The object of the invention is to use the agent of nano inorganic insulating wrapped to carry out insulation processing to Fe-Si magnetic, provide a kind of method of Fe-Si powder core preparing low-loss, high stability.
In the present invention low core loss Fe-Si powder core, the content of Si is 6.5 wt.%, and all the other are Fe constituent content.The technical solution used in the present invention is as follows.
1) powder preliminary treatment: powder material is first carried out the pretreatment of high temperature anneal in hydrogen, and annealing temperature is 800 DEG C, is incubated 2 hours, then slowly cools to room temperature.
2) preparation of Phosphating Solution: take the ethanolic solution being made into phosphoric acid after a certain amount of phosphoric acid or aluminium dihydrogen phosphate are dissolved in ethanol.
3) preparation of adhesive: adopt nano silicon, mica powder, kaolin etc. to be scattered in ethanol, form certain density colloidal solution or suspension-turbid liquid.
4) phosphorating treatment: take a certain amount of Phosphating Solution, after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry.The addition of Phosphating Solution is generally in 0.1 % of phosphoric acid in powder quality.
5) insulating binder is coated: take a certain amount of adhesive dispersion liquid, and after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry.The addition of adhesive is in about 1% of powder quality.
6) compressing: to adopt hydraulic press once compressing in grinding tool, compacting tonnage is 20 T/cm
2, add 0.15 % zinc stearate before compacting and make demoulding lubricant.Compacting sample is annular, and external diameter 14 mm, internal diameter 8 mm, quality control is at about 4.6 g.
7) annealing sintering: sample is placed in tube furnace, sinters under hydrogen atmosphere, sintering temperature at 600-800 DEG C, temperature retention time 1-2 hour.
The present invention adopts Nano-meter SiO_2
2as surface insulation clad material, through regulating and controlling the Parameter Conditions such as addition, stress relief annealing condition of adhesive, obtain low core loss (614 mW/cm
3, test condition is 50 kHz, 100 mT) Fe-6.5Si powder core.This powder core has the loss lower than ferrocart core, high cost performance and good direct current biasing characteristic.
Fe-6.5Si low-loss powder core of the present invention can be used for the higher high magnetic flux material of alternative cost.Due to the advantage of high saturation, can also be applied in the design and devdlop of heavy load inductance, such as, use the frequency converter of new forms of energy (solar energy, wind energy and hybrid power), power factor corrector and UPS uninterrupted power supply.
Accompanying drawing explanation
Fig. 1 be under different frequency condition core loss with change (0.3% Nano-meter SiO_2 in magnetic field
2).
Fig. 2 is DC superposition characteristic (0.3% Nano-meter SiO_2
2).
Fig. 3 is relation (0.3% Nano-meter SiO_2 of powder core loss and serviceability temperature
2).
Embodiment
The core loss of Fe-Si powder core of the present invention is 614 mW/cm
3between (50 kHz, 100 mT), embodiment is as follows.
Execution mode one.
1) low-loss Fe-Si powder core of the present invention is made up of Fe, Si two kinds of elements, and wherein Si Elements Atom ratio is 6.5 wt%, and all the other are Fe element.Powder granule size selects 200 orders.
2) first powder material is carried out the pretreatment of high temperature anneal in hydrogen, annealing temperature is 800 DEG C, is incubated 2 hours, then slowly cools to room temperature.
3) take 0.1 %(of powder quality in phosphoric acid) Phosphating Solution, after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry.
4) the adhesive dispersion liquid of powder quality 1 % and the SiO of 0.15 % is taken
2, after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry.
5) add 0.15 % zinc stearate and make demoulding lubricant, then adopt hydraulic press once compressing in a mold, compacting tonnage is 20 T/cm
2.
6) sample is placed in tube furnace, sinters under hydrogen atmosphere, sintering temperature at 650 DEG C, temperature retention time 1-2 hour.
Execution mode two.
In this execution mode, SiO
2addition be 0.2 %, all the other conditions are identical with execution mode one.
Execution mode three.
In this execution mode, SiO
2addition be 0.3 %, all the other conditions are identical with execution mode one.
Execution mode four.
In this execution mode, SiO
2addition be 0.3 %, sintering temperature is 800 DEG C, and all the other conditions are identical with execution mode one.
Execution mode five.
In this execution mode, SiO
2addition be 0.3 %, sintering temperature is 1000 DEG C, and all the other conditions are identical with execution mode one.
As can be seen from Table 1, compared with other insulating coating material, Nano-meter SiO_2
2coated powder core has minimum core loss.Although can obtain higher initial permeability for organic substance adhesive, from application point, organic substance is easily aging, and serviceability temperature scope is little.As seen from Figure 1, at test condition 100 kHz, under 100 mT, the core loss of Fe-6.5Si is 1300 mW/cm
3left and right, lower than 2000 mW/cm in invention CN 103700460 A
3.Nano-meter SiO_2 is described
2coating layer compares other covering obviously can reduce core loss.
Nano-meter SiO_2
2covering property excellent, insulation property good, sintering character is also better, therefore can control addition, and reduce the wastage.As can be seen from Table 2, Nano-meter SiO_2 is increased
2addition can improve insulating properties between magnetic powder particle, thus reduce eddy current, reduce power consumption.
Can see from table 3, for interpolation 0.3% Nano-meter SiO_2
2fe-6.5Si powder core is along with the rising of annealing temperature, and magnetic permeability declines slightly; Core loss then first declines, after have and increase rapidly.This is because powder core is very large at pressing process tonnage, and have very high residual stress, cause coercive force to increase, therefore annealing can not eliminate stress completely at low temperatures, causes power consumption higher.If but annealing temperature is too high, the crystal grain of powder core powder granule inside will be grown up rapidly, and crystal boundary reduces, and the resistivity of granule interior must be caused to reduce rapidly, and eddy current loss increases severely, and therefore total power consumption increases rapidly.Along with the reduction of powder core resistivity, magnetic permeability also can decline accordingly in fact, therefore for Nano-meter SiO_2
2coated Fe-6.5Si powder core, annealing temperature should be selected in about 800 DEG C.
Shown in Fig. 2 is 0.3% Nano-meter SiO_2
2initial permeability under coated powder core direct current biasing changes relatively, (test frequency 1 kHz).Can find out that powder core is when its direct current biasing field reaches 90 Oe, initial permeability is reduced to without half time biased, and direct current biasing performance is good.
Fig. 3 contrast lists us and measures total losses between 20-125 DEG C.Obviously find out from figure, use Nano-meter SiO_2
2the attrition table of coated Fe-6.5Si powder core reveals the relation totally declined with temperature, but occurs fluctuation in some temperature.Generally speaking, Nano-meter SiO_2
2coated Fe-6.5Si powder core shows good drain performance.Because loss declines with serviceability temperature, therefore, when temperature raises, powder core can play the effect of cooling automatically.SiO is described
2coated Fe-6.5Si powder core has good thermal stability.
Claims (4)
1. the Fe-Si powder core and preparation method thereof of a low core loss, be specially: first powder material is carried out the pretreatment of high temperature anneal in hydrogen, annealing temperature is 800 DEG C, is incubated 2 hours, then slowly cools to room temperature; Take the Phosphating Solution of 0.1 % of powder quality, after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry; Take the adhesive dispersion liquid of powder quality 1 % and the SiO of 0.15 ~ 3 % again
2, after adding powder, uniform stirring to solvent volatilizees to the greatest extent substantially, then 80 DEG C of oven dry; Add 0.15 % zinc stearate and make demoulding lubricant, then compacting tonnage be 20 T/cm
2lower compressing; Finally sample is placed in tube furnace, sinters under hydrogen atmosphere, sintering temperature is at 650 ~ 1000 DEG C, and temperature retention time is 1-2 hour.
2. according to claim 1) Fe-Si powder core prepared by described method, its core loss is minimum is 614 mW/cm
3.
3. according to claim 1) Fe-Si powder core prepared by described method, there is good direct current biasing characteristic.
4. according to claim 1) Fe-Si powder core prepared by described method, there is good thermal stability.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409462A (en) * | 2016-09-07 | 2017-02-15 | 同济大学 | High-silicon-steel ferrite soft magnetic composite magnetic powder core and preparation method thereof |
| CN107492433A (en) * | 2017-07-05 | 2017-12-19 | 安徽江威精密制造有限公司 | A kind of iron-based soft magnetic composite of doping vario-property nickel powder and preparation method thereof |
| CN108565108A (en) * | 2018-04-10 | 2018-09-21 | 广东省材料与加工研究所 | A kind of iron silicon titanium powder core and its preparation method and application |
| CN115588548A (en) * | 2022-11-04 | 2023-01-10 | 广东泛瑞新材料有限公司 | Alloy magnetic powder core and preparation method and application thereof |
-
2014
- 2014-12-09 CN CN201410744002.1A patent/CN104392817A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409462A (en) * | 2016-09-07 | 2017-02-15 | 同济大学 | High-silicon-steel ferrite soft magnetic composite magnetic powder core and preparation method thereof |
| CN107492433A (en) * | 2017-07-05 | 2017-12-19 | 安徽江威精密制造有限公司 | A kind of iron-based soft magnetic composite of doping vario-property nickel powder and preparation method thereof |
| CN108565108A (en) * | 2018-04-10 | 2018-09-21 | 广东省材料与加工研究所 | A kind of iron silicon titanium powder core and its preparation method and application |
| CN115588548A (en) * | 2022-11-04 | 2023-01-10 | 广东泛瑞新材料有限公司 | Alloy magnetic powder core and preparation method and application thereof |
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