CN108597714B - Sendust core and preparation method thereof - Google Patents
Sendust core and preparation method thereof Download PDFInfo
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- CN108597714B CN108597714B CN201810609123.3A CN201810609123A CN108597714B CN 108597714 B CN108597714 B CN 108597714B CN 201810609123 A CN201810609123 A CN 201810609123A CN 108597714 B CN108597714 B CN 108597714B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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Abstract
The present invention proposes a kind of sendust core and preparation method thereof, belongs to magnetic field of material technology, is able to solve the technical problems such as existing aerosolization iron sial powder loss is high, direct current biasing ability is weak.The technical solution includes being dusted using metal smelt, aerosolization and being prepared iron sial powder；The iron sial powder is sieved, the powder sieved under different mesh ranges is mixed in proportion；Insulating wrapped processing is carried out to uniformly mixed powder, the type of being then pressed into obtains magnetic core；The magnetic core is made annealing treatment, then to magnetic core surface spray insulation inorganic agent.The present invention can be applied in the production process of high magnetic characteristics sendust core.
Description
Technical field
The invention belongs to magnetic field of material technology more particularly to a kind of sendust core and preparation method thereof.
Background technique
1936, Japanese Yamamoto and increase the present invention a kind of alloy with high permeability of not nickeliferous metal, i.e. iron
Silico-aluminum, due to its invention for the celestial platform of Japan, this is special, therefore also known as this special alloy of celestial platform.The standard analysis of the alloy is
Al5.4%, Si9.6%, remaining is Fe, and the distinguishing feature of the alloy is with leveling off to zero magnetic anisotropy COEFFICIENT K 1 and full
With magnetic hysteresis coefficient of dilatation λ s.Compared to other soft-magnetic composite materials, FeSiAl soft-magnetic composite material have be lost it is low, resistance is high, at
Originally the overall merits such as low, noiseless, make it by favor.
With the raising of electronic technology, the requirement to magnetic device is also higher and higher, main toward miniaturization, the side of high frequency
To development, this undoubtedly needs all to put forward higher requirements magnetic loss and temperature rise model.In order to optimize the performance of iron sial powder,
Traditional crumbling method is substituted in a manner of aerosolization gradually in the market to prepare iron sial powder.The advantage of gas-atomized powder is
It eliminates by shaping process bring stress such as broken, ball millings, reduce oxygen content, therefore, aerosolization iron sial either iron
Pcv (kw/m is lost3) or direct current biasing ability all have a clear superiority than broken iron sial.
Aerosolization iron sial powder quality is irregular currently on the market, and loss is lower, direct current biasing ability is higher
Magnetic property powder-product is always the direction that soft magnetic powder production industry is pursued.Therefore, how to optimize the magnetic property of iron sial, dig
Its potentiality is dug, this all has highly important meaning to the development of the market competitiveness or soft magnetic materials that improve powder production quotient
Justice.
Summary of the invention
The present invention proposes a kind of sendust core and preparation method thereof, can be real by the sendust core that this method is prepared
Existing magnetic core more low-loss, while direct current biasing ability effectively improves, and can effectively meet existing market to the hair of soft magnetic materials
Exhibition demand.
In order to achieve the above object, a kind of preparation method of sendust core of the present invention, which is characterized in that including following step
It is rapid:
It is dusted using metal smelt, aerosolization and prepares iron sial powder；
The iron sial powder is sieved, the powder sieved under different mesh ranges is mixed in proportion
It is even；
Insulating wrapped processing is carried out to uniformly mixed powder, the type of being then pressed into obtains magnetic core；
The magnetic core is made annealing treatment, then to magnetic core surface spray insulation inorganic agent；
Wherein, the insulating wrapped, which is handled, includes:
Mica powder is added into the uniformly mixed powder, is uniformly mixed；
Phosphoric acid solution passivation is added, is uniformly mixed, after dry, the aqueous solution of silica solution is added, is uniformly mixed, is done
It is dry；
Glass powder with low melting point and silicone resin are sequentially added, is uniformly mixed；
It is eventually adding zinc stearate, is uniformly mixed.
Preferably, using air induced melting mode when metal smelt, smelting temperature is 1400-1800 DEG C；Aerosolization spray
Using liquid nitrogen as atomization protective gas when powder, spray disk pressure is 5-30bar, and the flow velocity that dusts is 7-30kg/min.
Preferably, the powder proportions sieved under different mesh ranges are as follows: -100~+150 mesh account for 1-3%, and -150
~+200 mesh account for 10-15%, and -200~+250 mesh account for 10-20%, and -250~+400 mesh account for 20-25%, and -400 mesh accountings >=
32%.
Preferably, insulating wrapped processing includes: additive amount to be added into the uniformly mixed powder as 0.1-
The mica powder of 2.0wt% is uniformly mixed；The phosphoric acid solution that additive amount is 0.1-2wt% is added to be passivated, is uniformly mixed, does
After dry, the aqueous solution for the silica solution that additive amount is 0.1-1.0wt% is added, is uniformly mixed, is dried；Sequentially add addition
The silicone resin that the glass powder with low melting point and additive amount that amount is 0.1-1.5wt% are 0.2-2.0wt%, is uniformly mixed；Finally plus
Enter the zinc stearate that additive amount is 0.5wt%, is uniformly mixed.
Preferably, pressure used by compression moulding is 14-28t/cm2, the outer diameter for the toroidal core suppressed is
27mm。
Preferably, annealing in 750-850 DEG C, under nitrogen protection operation be no more than 2 hours.
Preferably, the spray insulation processing uses epoxy resin for inorganic agent.
The present invention also provides a kind of iron sial that the preparation method as described in any of the above-described technical solution is prepared
Magnetic core.
Preferably, the sendust core is in magnetic conductivity 60, DC-bias >=64% of 100Oe, core loss is low
To 300kw/m3。
Compared with prior art, the advantages and positive effects of the present invention are:
1, sendust core prepared by the present invention can be such that mixed-powder has excellent by the grain size proportion of refinement powder
Filling effect increases the apparent density and tap density of powder, improves mobility, and then improve the pressed density and magnetic core of magnetic core
Weight, final to improve direct current biasing ability, obtaining outer diameter is the magnetic core of 27mm in 60 magnetic conductivity, and the DC-bias of 100Oe is
64%；
2, by optimize insulating compound formula and study mica powder order of addition and its additive amount variation it is exhausted to magnetic core
The influence of edge, to obtain loss down to PCV(100kHz/100mT)=300kw/m3Magnetic core performance；
3, by compression moulding and annealing, obtained even tissue, high intensity, high-compactness alloy soft magnetic powder
Core；
4, it is handled by spray insulation, improve the corrosion resistance of soft magnetic-powder core and uses the time.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The embodiment of the invention provides a kind of preparation methods of sendust core, comprising the following steps:
S1: it is dusted using metal smelt, aerosolization and prepares iron sial powder；
S2: the iron sial powder is sieved, the powder sieved under different mesh ranges is mixed in proportion
Uniformly；
S3: insulating wrapped processing is carried out to uniformly mixed powder, the type of being then pressed into obtains magnetic core；
S4: making annealing treatment the magnetic core, then to magnetic core surface spray insulation inorganic agent；
Wherein, the insulating wrapped, which is handled, includes:
Mica powder is added into the uniformly mixed powder, is uniformly mixed；
Phosphoric acid solution passivation is added, is uniformly mixed, after dry, the aqueous solution of silica solution is added, is uniformly mixed, is done
It is dry；
Glass powder with low melting point and silicone resin are sequentially added, is uniformly mixed；
It is eventually adding zinc stearate, is uniformly mixed.
The preparation method of sendust core provided in this embodiment passes through the grain size proportion of optimization powder, the formula of insulating compound
And the order of addition of mica powder, so that the sendust core being prepared is equal in terms of core loss and direct current biasing ability
It is significantly improved.Specifically, the grain size proportion to powder optimizes, it can make mixed-powder that there is excellent filling to imitate
Fruit increases the apparent density and tap density of powder, improves mobility, and then improve the pressed density and magnetic core weight of magnetic core,
It is final to improve direct current biasing ability；In addition, covering material is optimized while right when the present embodiment is for insulating wrapped processing
The order of addition of mica powder is optimized, so that adding few as far as possible when guaranteeing that insulating materials plays necessary insulating effect
Megohmite insulant, the thickness of insulating layer is reduced on the basis of guaranteeing that resistivity is high, could more effectively improve powder particle it
Between compactibility, to effectively improve the DC-Bias performance of magnetic core.
It should also be noted that, aerosolization is dusted, the raw material ratio of process is Al:5.4%, Si:9.6%, remaining is
Iron.Said ratio is capable of forming stable iron silicon-aluminum structure, guarantees the excellent magnetic property of aerosolization iron sial.
In a preferred embodiment, air induced melting mode is used when metal smelt, smelting temperature is 1400-1800 DEG C；
Using liquid nitrogen as atomization protective gas when aerosolization is dusted, spray disk pressure is 5-30bar, and the flow velocity that dusts is 7-30kg/min.
The processing mode of initial iron sial powder is optimized in the present embodiment, wherein smelting temperature can for 1450 DEG C, 1500 DEG C,
Any other temperature value in 1550 DEG C, 1600 DEG C, 1650 DEG C, 1700 DEG C, 1750 DEG C or above range, spray disk pressure can be
Any other pressure value in 10bar, 15bar, 20bar, 25bar or above range, the flow velocity that dusts can be 7kg/min, 10kg/
Any other flow speed value in min, 15kg/min, 20kg/min, 25kg/min or above range.Specifically, art technology
Personnel can reasonably adjust within the above range according to practical condition.
In a preferred embodiment, the powder proportions sieved under different mesh ranges are as follows: -100~+150 mesh account for 1-
3%, -150~+200 mesh account for 10-15%, and -200~+250 mesh account for 10-20%, and -250~+400 mesh account for 20-25%, -400 mesh
Accounting >=32%.The ratio of powder after sieve is optimized in the present embodiment, including to selected Shai Hou powder size area
Between range and the accounting of large or fine granule optimization, this is primarily due to, and powder size interval range is wider, large or fine granule accounts for
Than more reasonable, various sizes of fine powder can be more effectively filled gap, keep its apparent density and tap density higher, powder
End mobility it is better, in pressing process between particle it is readily flowed, can the entire mold of Fast Filling, more effectively to pressure
It is fed back, improves pressed density, the weight of powder core, to improve DC-bias performance.
In a preferred embodiment, insulating wrapped processing includes: and additive amount is added into the uniformly mixed powder to be
The mica powder of 0.1-2.0wt% is uniformly mixed；The phosphoric acid solution that additive amount is 0.1-2wt% is added to be passivated, mixing is equal
It is even, after dry, the aqueous solution for the silica solution that additive amount is 0.1-1.0wt% is added, is uniformly mixed, is dried；Successively add again
Enter the glass powder with low melting point that additive amount is 0.1-1.5wt% and the silicone resin that additive amount is 0.2-2.0wt%, is uniformly mixed；
It is eventually adding the zinc stearate that additive amount is 0.5wt%, is uniformly mixed.
In the above-described embodiments, mica powder is fed first into iron aluminum silicon powder as a kind of powder class insulating materials that mesh number is superfine
It in end, is mixed with powder, is sticked to the surface of metallic particles, then add phosphoric acid solution to the inside again, as a kind of solution,
Phosphoric acid can effectively coat all powder, including mica powder, and be passivated its surface.Then silicon sol solution is added again,
Mica powder and iron sial powder have been coated two layers by solution at this time, and have carried out prolonged stirring.It is suitable compared to other
The addition of sequence, such as phosphoric acid, mica powder, silica solution or phosphoric acid, silica solution, mica powder etc., sequence provided in this embodiment can make
Mica powder and iron sial powder mix time longest are obtained, cladding is the closest, therefore insulation effect is preferably also.It is added in mica powder
Measure it is low in the case where can reach 60 magnetic conductivities, and core loss is minimum.
In a preferred embodiment, pressure used by compression moulding is 14-28t/cm2, the toroidal core suppressed
Outer diameter be 27mm.In a preferred embodiment, annealing in 750-850 DEG C, under nitrogen protection operation be no more than it is 2 small
When.In the above-described embodiments, by compression moulding and annealing treating process, even tissue, high intensity, high-compactness have been obtained
Alloy soft magnetic powder core.In conjunction with above-mentioned parameter, the performance and specification of magnetic core can effectively ensure that.
In a preferred embodiment, the spray insulation processing uses epoxy resin for inorganic agent.At spray insulation
Reason can be improved the corrosion resistance of soft magnetic-powder core and use the time.
The iron sial magnetic that the preparation method as described in above-described embodiment that the embodiment of the invention also provides a kind of is prepared
Core.The sendust core is in magnetic conductivity 60, DC-bias >=64% of 100Oe, and core loss is down to 300kw/m3.By
The sendust core that this method is prepared realize magnetic core it is more low-loss direct current biasing ability effectively improves simultaneously,
Existing market can effectively be met to the growth requirement of soft magnetic materials.
Sendust core and preparation method thereof provided by the embodiment of the present invention is introduced in detail in order to become apparent from, and below will
It is described in conjunction with specific embodiments.
Magnetism testing content includes inductance, calculates magnetic conductivity, unit volume iron loss, direct current biasing ability.
Test method is as follows:
Using the inductance of 6377 LCR instrument of Mircrotest measurement magnetic core.According to e=L × Le × 10 formula μ3/0.4/π/
N2/ Ae calculates the Effective permeability μ e of sample.Wherein, L is inductance (uH), and μ e is Effective permeability, and N is the number of turns, and Ae is magnetic
Core section accumulates (mm2), Le is the magnetic core length of magnetic path (mm).
Using the iron-loss per unit weight of the rugged SY8219B-H tester test magnetic core of rock, test condition 100kHz/100mT, unit
For kW/m3.Using the direct current biasing ability of 6377 instrument of Mircrotest test magnetic core, 0.9 bronze medal of test condition 1kHz, 1v, Φ
Line list is tested to obtain %Ldc@100Oe (60 μ) under 20 circles, 25.27A rated current.
Embodiment 1
It is dusted using metal smelt, aerosolization and prepares iron sial powder, wherein smelting temperature is 1650 DEG C, atomization protection gas
Body uses liquid nitrogen, and spray disk pressure is 25bar, and the flow velocity that dusts is 25kg/min.
Grain size proportion is as follows: -100~+150 mesh account for 1%, and -150~+200 mesh account for 10%；- 200~+250 mesh account for
10%, -250~+400 mesh account for 20%, and -400 mesh account for 59%.
Insulating wrapped is carried out to uniformly mixed powder, the mica powder and iron sial powder for being first 0.4wt% by additive amount
It is uniformly mixed, then carries out phosphoric acid solution passivation, additive amount 0.5wt% after dry, adds the aqueous solution of silica solution to powder
In, glass powder with low melting point 0.5wt% is added in powder, then add the silicone of 0.5wt% by additive amount 1wt% after dry
Resin is uniformly mixed, and finally adds the lubricant stearic acid zinc of 0.5wt%.
The pressure of compression moulding uses 20t/cm2, it is pressed into the toroidal core that outer diameter is 27mm.
Annealing carries out 30min at 780 DEG C, is protected using the atmosphere of nitrogen, finally sprays to magnetic core surface
Insulation processing agent, obtains sendust core.
Embodiment 2
It is dusted using metal smelt, aerosolization and prepares iron sial powder, wherein smelting temperature, atomization protective gas, spray disk
Pressure, the flow velocity that dusts are consistent with embodiment 1.
The grain size proportion of the mixed-powder is that -100~+150 mesh account for 3%, and -150~+200 mesh account for 15%；- 200~+
250 mesh account for 20%, and -250~+400 mesh account for 25%, and -400 mesh accountings 32% are uniformly mixed.
Insulating wrapped process is same as Example 1.
Compression moulding is same as Example 1.
It makes annealing treatment same as Example 1.
Embodiment 3
It is dusted using metal smelt, aerosolization and prepares iron sial powder, wherein smelting temperature, atomization protective gas, spray disk
Pressure, the flow velocity that dusts are consistent with embodiment 1.
Grain size proportion is as follows: -100~+150 mesh account for 2%, and -150~+200 mesh account for 8%；- 200~+250 mesh account for 15% ,-
250~+400 mesh account for 22%, and -400 mesh account for 53%, are uniformly mixed.
Insulating wrapped process is same as Example 1.
Compression moulding is same as Example 1.
It makes annealing treatment same as Example 1.
Comparative example 1
The difference from embodiment 1 is that: powder was 140 mesh screens, and obtaining proportion by slap is -100~+150 mesh
0.5% is accounted for, -150~+200 mesh account for 7%；- 200~+250 mesh account for 25%, and -250~+400 mesh account for 37.5%, and -400 mesh account for
30%, it is uniformly mixed.By the screening situation of slap sieve, obtained powder size is thicker, and distribution is relatively narrow.
Comparative example 2
The difference from embodiment 1 is that: powder was 200 mesh screens, was -100~+150 by the proportion that slap obtains
Mesh accounts for 0.04%, and -150~+200 mesh account for 0.09%；- 200~+250 mesh account for 9%, and -250~+400 mesh account for 40%, and -400 mesh account for
50.87%, it is uniformly mixed.By the screening situation of slap sieve, obtained powder size is thicker, and distribution is relatively narrow.
Performance test
To embodiment 1-3 and the obtained sendust core of comparative example 1-2 magnetic property, apparent density, tap density and
It is compared in terms of magnetic core weight, to illustrate its performance advantage, see Table 1 for details for test data.
The performance test data of table 1 embodiment 1-3 and the obtained sendust core of comparative example 1-2
As shown in Table 1, in the case where grain size intervals powder accounting optimizes, the core loss of Φ 27mm is minimum to be can achieve
300kw/m3, DC-Bias 64%, under the grain size proportion of optimization, the magnetic property of corresponding powder, apparent density, tap density
And magnetic core weight is superior to comparative example.
The quality of apparent density and the mobility of tap density characterization powder, under normal circumstances, the two is higher, represents powder
Mobility it is better, the grain size proportion of powder is more reasonable.Therefore, apparent density and tap density can be used as assessment powder size
The whether reasonable effective detection means of proportion.As shown in Table 1, the apparent density with tap density of embodiment 1-3 are relatively high, right
The magnetic core weight answered is all in 26.8g or more, it was demonstrated that the grain size proportion in this embodiment is more reasonable, and the density of magnetic core obtains effectively
It improves, therefore the DC-bias performance of embodiment 1-3 is all relatively good, 64% or more, improves nearly 10% compared with comparative example.
In the case where insulation processing, powdered ingredients, magnetic core size are constant, the weight of magnetic core is higher, and DC-Bias is higher,
Corresponding drain performance can be reduced slightly, this is because powder core pressing weight does not increase, density is low, deposits between particle and particle
Air gap it is bigger, Effective permeability is lower, and uniquely having magnetic Fe content in same volume reduces, DC-Bias it is inevitable with
Reduction.
Powder size interval range is wider, large or fine granule accounting is more reasonable, and various sizes of fine powder can be more effectively right
Gap is filled, and keeps its apparent density and tap density higher, and the mobility of powder is better, in pressing process between particle
It is readily flowed, can the entire mold of Fast Filling, more effectively pressure is fed back, improves pressed density, the weight of powder core, from
And improve DC-bias performance.
Comparative example 3
It is the mica powder order of addition of insulating wrapped with the difference place of embodiment 1.
Insulating wrapped is carried out to uniformly mixed powder, first carries out phosphoric acid solution passivation, additive amount 0.5wt% is dry
Afterwards, then additive amount be 0.6wt% mica powder into iron sial powder, stir evenly, then, by the aqueous solution of silica solution to powder
In end, glass powder with low melting point 0.5wt% is added in powder, then add 0.5wt%'s by additive amount 1.0wt% after dry
Silicone resin stirs evenly.Finally add the lubricant stearic acid zinc of 0.5wt%.
Comparative example 4
It is the mica powder order of addition of insulating wrapped with the difference place of embodiment 1,3.
Insulating wrapped is carried out to uniformly mixed powder, first carries out phosphoric acid solution passivation, additive amount 0.5wt% is dry
Afterwards, by the aqueous solution of silica solution into powder, additive amount 1.0wt%, after dry, then additive amount is the mica powder of 0.8wt%
It into iron sial powder, stirs evenly, then, glass powder with low melting point 0.5wt% is added in powder, then add 0.5wt%
Silicone resin, stir evenly.Finally add the lubricant stearic acid zinc of 0.5wt%.
2 embodiment 1 of table, the performance test data of the obtained sendust core of comparative example 3-4
As shown in Table 2, the magnetic core magnetic property of embodiment 1 is best, and in the formula, the optimal sequence for adding mica powder is cloud
Female powder, phosphoric acid, silica solution, glass powder, silicone resin, lubricant.Wherein the loss in embodiment 1 is compared with the loss in embodiment 4
It reduces by 37%, DC and promotes 10%, weight promotes 0.4g.
By table 2 it is also seen that the magnetic core that magnetic conductivity is 60 in order to obtain, the different order of addition of mica powder will lead to it and add
Dosage is different.Mica powder is as a kind of low density non magnetic megohmite insulant, and the amount of addition is more, it is meant that the gas inside powder core
Gap is bigger, and the insulating layer between iron sial powder is thicker, and density reduces between metallic particles, effective magnetisable material Fe content
It reduces, density reduces, so as to cause DC-Bias reduction.Therefore, when guaranteeing that insulating materials plays necessary insulating effect,
Addition megohmite insulant few as far as possible, reduces the thickness of insulating layer, can effectively improve the DC-Bias performance of magnetic core.
Since the order of addition of mica powder is different, in embodiment 1, mica powder insulate as a kind of powder class that mesh number is superfine
Material is fed first into iron sial powder, is mixed with powder, and the surface of metallic particles is sticked to, and is then added again to the inside
Phosphoric acid solution, as a kind of solution, phosphoric acid can effectively be coated all powder, including mica powder, and be passivated its surface.
Then silicon sol solution is added again, and mica powder and iron sial powder have been coated two layers by solution at this time, and when having carried out long
Between stirring, in this three kinds of embodiments, embodiment 1 belongs to mixing time longest, and coats with iron sial powder the closest.
Therefore insulation effect is best, 60 magnetic conductivities can be reached in the case where additive amount is low, and core loss is minimum,
100kHz/100mT reduces 37.5% compared with embodiment 4.
From the foregoing, it will be observed that the preparation-obtained sendust core of the embodiment of the present invention can realize magnetic core more low-loss, while straight
Stream biasing ability effectively improves, and can effectively meet existing market to the growth requirement of soft magnetic materials.
Claims (8)
1. a kind of preparation method of sendust core, which comprises the following steps:
It is dusted using metal smelt, aerosolization and prepares iron sial powder；
The iron sial powder is sieved, the powder sieved under different mesh ranges is mixed in proportion；
Insulating wrapped processing is carried out to uniformly mixed powder, the type of being then pressed into obtains magnetic core；
The magnetic core is made annealing treatment, then to magnetic core surface spray insulation inorganic agent；
Wherein, the insulating wrapped, which is handled, includes:
0.1-2.0wt% mica powder is added into the uniformly mixed powder, is uniformly mixed；
The passivation of 0.1-2wt% phosphoric acid solution is added, is uniformly mixed, after dry, the aqueous solution of 0.1-1.0wt% silica solution is added,
It is uniformly mixed, is dried；
0.1-1.5wt% glass powder with low melting point and 0.2-2.0wt% silicone resin are sequentially added, is uniformly mixed；
It is eventually adding 0.5wt% zinc stearate, is uniformly mixed.
2. preparation method according to claim 1, which is characterized in that use air induced melting mode, smelting when metal smelt
Refining temperature is 1400-1800 DEG C；Using liquid nitrogen as atomization protective gas when aerosolization is dusted, spray disk pressure is 5-30bar, spray
Powder flow rate is 7-30kg/min.
3. preparation method according to claim 1, which is characterized in that the powder proportions sieved under different mesh ranges
Are as follows: -100~+150 mesh account for 1-3%, and -150~+200 mesh account for 10-15%, and -200~+250 mesh account for 10-20%, and -250~+400
Mesh accounts for 20-25%, -400 mesh accounting >=32%.
4. preparation method according to claim 1, which is characterized in that pressure used by compression moulding is 14-28t/cm2,
The outer diameter for suppressing obtained toroidal core is 27mm.
5. preparation method according to claim 1, which is characterized in that annealing in 750-850 DEG C, under nitrogen protection
Operation is no more than 2 hours.
6. preparation method according to claim 1, which is characterized in that the spray insulation processing uses epoxy resin for place
Manage agent.
7. a kind of sendust core that preparation method as claimed in any one of claims 1 to 6 is prepared.
8. sendust core according to claim 7, which is characterized in that the sendust core in magnetic conductivity 60,
DC-bias >=64% of 100Oe, core loss is down to 300kw/m3。
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| CN110176337B (en) * | 2019-07-03 | 2020-12-22 | 深圳市麦捷微电子科技股份有限公司 | High-filling-rate metal soft magnetic powder and preparation method thereof |
| CN110797182A (en) * | 2019-11-08 | 2020-02-14 | 上海置信电气非晶有限公司 | Insulation coating method for preparing amorphous magnetic powder core by utilizing recycled amorphous material |
| CN111029076B (en) * | 2020-01-15 | 2021-03-30 | 合肥工业大学 | Gas atomization iron-silicon-aluminum soft magnetic composite material with low intermediate frequency loss |
| CN113963929A (en) * | 2020-07-20 | 2022-01-21 | 昆山磁通新材料科技有限公司 | Method for improving insulation impedance of molded inductor |
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