CN105931790A - Iron-silicon-aluminum magnetic powder core and preparation method thereof - Google Patents
Iron-silicon-aluminum magnetic powder core and preparation method thereof Download PDFInfo
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- 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
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Abstract
The invention relates to a preparation method of an iron-silicon-aluminum magnetic core. The preparation method comprises the steps of: (S10) preparing iron-silicon-aluminum powder; (S20) preparing iron-silicon powder; (S30) carrying out specific screen target screening on the iron-silicon-aluminum powder and the iron-silicon powder respectively, wherein the composition of the iron-silicon-aluminum powder is 120-270 meshes and the composition of the iron-silicon powder is 200-325 meshes; (S40) carrying out passivating treatment and insulating coating treatment on the screened powder respectively; (S50) mixing the powder at different ratios; (S60) carrying out compression molding on the mixed powder; and (S70) carrying out annealing and spraying insulating treatment on the molded magnetic powder core in sequence. In the preparation process, the loss of the prepared magnetic core can be greatly reduced through a powdering technology of atomized iron-silicon-aluminum and the DC bias capability is improved; the DC bias capability can be greatly improved again through mixing with quantitative atomized iron-silicon-aluminum; and the prepared magnetic core obtains a relatively low loss when the DC bias capability is greatly improved through screening the particle sizes of specific atomized iron-silicon-aluminum and atomized iron-silicon.
Description
Technical field
The present invention relates to metal soft magnetic material and manufacture field, be specifically related to a kind of Fe-Si-Al magnetic core and system thereof
Preparation Method.
Background technology
Fe-Si-Al alloy increases the present invention in northeastern Japan university in 1936, just leads due to it at the beginning of its invention
Magnetic coefficient, the magnetic flux density that magnetostriction coefficient is close to zero and high, and demonstrate excellent soft magnet performance.But
Fe-Si-Al alloy is hard and crisp, after make compressed-core, instead of ferrite.For as magnetic head material,
Wherein add Cr and improve corrosion resistance, develop the magnetic head material of anti-corrosion, wear-resisting tape recorder.
In recent years get back in terms of compressed-core, electromagnetic shielding development.It is mainly used in Switching Power Supply magnetic core, circuit
Noise filter, pulse transformer, kickback transformer and pfc controller.
Conventional conventional metals powder core, is respectively arranged with pluses and minuses.Although ferromagnetic oxide powder core can be used for high frequency model
Enclose, but its low saturation induction density also limit its application scenario；Although ferrocart core is cheap,
But high frequency characteristics and loss characteristic are the best；Although permalloy powder core high frequency characteristics, DC superposition characteristic and
Loss characteristic is all good, but fancy price is also only used for the special occasions such as Aero-Space；Though amorphous powder core
So having without anisotropic longrange disorder, the special construction of shortrange order, comprehensive magnetic can be excellent, but
It is owing to magnetostriction coefficient λ s is not zero, causes amorphous powder core to there is noise problem, in a lot of fields
All kept outside of the door.In sum, existing powder core product, performance has features, price
Widely different, application also has respective difference.In general, its performance has weak point, is improved
Leeway；Price is higher, has decline space.Along with the development of electronic technology, device miniaturization, lightness,
Cause having necessarily become smaller of electronic device.And miniaturization, power density, it is necessary to make powder core material
High frequency and low-loss, and ferrum Si-Al Magnetic Powder Core has this high frequency, low-loss and cost degradation
Feature.
In sum, Fe-Si-Al magnetic core has many advantages relative to other powder cores, but ferrum sial now
The production of powder core also faces many problems:
1. the bigoted ability of ferrum sial direct current under big electric current is poor, can not meet the technology day by day promoted
Standard, to such an extent as to much require that higher electronic devices and components all can not be up to standard.
2. tradition crush method prepares ferrum sial, and except the bigoted ability of direct current, loss also awaits carrying further
Height, and cheap, there is no competitive advantage, manufacture process rigor is inadequate.
Summary of the invention
For solving the problems referred to above, it is an object of the invention to provide the preparation method of a kind of Fe-Si-Al magnetic core,
Improve the present situation of the bigoted ability of direct current of conventional iron sial, with adapt to electronic devices and components development needs and
The requirement produced in enormous quantities.
First aspect, the invention provides the preparation method of a kind of sendust core, including: S10, system
Standby ferrum sial powder；S20, prepares ferrum Si powder；S30, to described ferrum sial powder and described ferrum silica flour
End carries out specified sieve purpose screening respectively；Wherein ferrum sial powder consists of-120 mesh～-270 mesh, ferrum silicon
Powder consist of-200 mesh～-325 mesh；S40, is passivated the powder after screening processing respectively successively
Process with insulating wrapped；；S50, the powder after step S40 being processed is mixed by different ratio；S60,
Mixed powder is pressed；S70, anneals successively to the powder core of described molding and sprays
It is coated with insulation processing.
Preferably, described ferrum sial powder and ferrum Si powder all use aerosolization method to be prepared from.
Preferably, passivator described in step S40 uses phosphoric acid solution, and its addition is powder quality
1～5%.
Preferably, insulating wrapped described in step S40 processes particularly as follows: add insulating compound and binding agent
Carry out insulating wrapped process；Wherein, insulating compound uses Ludox and glass powder with low melting point, and addition is respectively
It is 0.5～5wt% and 0.5～5wt%；Binding agent uses silicone resin, and addition is 1～5wt%.
Preferably, in step S50, ferrum sial powder account for ferrum sial powder and the 20 of ferrum Si powder gross mass～
80%.
It is further preferred that in step S50, ferrum sial powder accounts for ferrum sial powder and the total matter of ferrum Si powder
The 50～80% of amount.
Preferably, compressing described in step S60 pressure uses 14～28t/cm2。
Preferably, make annealing treatment described in step S70 and carry out less than 6h. at 650～750 DEG C
Preferably, spray insulation described in step S70 processes and uses epoxy resin is inorganic agent.
Second aspect, it is provided that Fe-Si-Al magnetic core prepared by preparation method described in a kind of above-mentioned first aspect.
The preparation method that the present invention provides has the advantages that 1, by the powder process of aerosolization ferrum sial
Technique, can be substantially reduced the loss of prepared magnetic core, and promote the bigoted ability of direct current；2, by with quantitatively
The mixing of aerosolization ferrum Si powder, can the most significantly promote the bigoted ability of direct current；3, by specific gas
Atomization ferrum sial and the screening of aerosolization ferrum silicon granularity, make to prepare magnetic core and be substantially improved in the bigoted ability of direct current
While obtain relatively low-loss；4, by compressing and annealing, obtain even tissue, high-strength
Degree, high-compactness and the alloy soft magnetic powder core of high frequency pcrmeability；5, processed by spray insulation, improve soft
The corrosion resistance of powder core and the time of use.
Accompanying drawing explanation
The preparation method flow chart of the Fe-Si-Al magnetic core that Fig. 1 provides for the embodiment of the present invention one.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.Should
Specifically describe when being interpreted as these embodiments to be only used in more detail, but be not intended to limit the present invention
Protection domain.
Embodiment one
The preparation method flow chart of the Fe-Si-Al magnetic core that Fig. 1 provides for the embodiment of the present invention one, such as Fig. 1
Shown in, described method includes:
S10, prepares ferrum sial powder.
Specifically, use and smelt under vacuum environment, and use aerosolization method to be prepared under an inert atmosphere.
S20, prepares ferrum Si powder.
Specifically, identical with the preparation method of ferrum sial powder in step S10, use smelting under vacuum environment
Refining, and use aerosolization method to be prepared under an inert atmosphere.
S30, carries out specified sieve purpose screening respectively to described ferrum sial powder and described ferrum Si powder；Wherein
Ferrum sial powder consists of-120 mesh～-270 mesh, ferrum Si powder consist of-200 mesh～-325 mesh.
S40, is passivated the powder after screening processing and insulating wrapped process respectively successively.
Specifically, it is passivated successively processing and at insulating wrapped to ferrum sial powder and ferrum Si powder respectively
Reason.As a example by ferrum sial powder, it is passivated successively it processing and insulation processing, particularly as follows: first
Quantitative ferrum sial powder is poured in blender, after stirring a few minutes, adds the phosphorus playing passivation effect
Acid solution, its addition is the 1～5% of ferrum sial powder quality, mix homogeneously.At the uniform velocity stirring is until powder
End is dried；Being subsequently adding silicon sol solution, addition is the 0.5～5% of ferrum sial powder quality, continues to stir
Mix uniformly；Treating that powder adds insulating compound glass powder with low melting point after drying, addition is ferrum sial powder quality
0.5～5%, be subsequently adding binding agent silicone resin, addition is the 1～5% of ferrum sial powder quality,
Stirring is until being dried；Being eventually adding lubricant to be uniformly mixed, its addition is ferrum sial powder quality
0.3%.Ferrum Si powder uses above-mentioned same Passivation Treatment and insulating wrapped to process.
It should be noted that wherein, glass powder with low melting point primarily serves the effect of insulating compound, in addition,
The effect of binding agent can also be played, and add wetting agent, mainly be beneficial to follow-up compressing and protection
Mould.
S50, the powder after step S40 being processed is mixed by different ratio.
Specifically, ferrum sial powder accounts for ferrum sial powder and the 20～80% of ferrum Si powder gross mass.
S60, is pressed mixed powder.
Specifically, mixed-powder step S50 obtained, compressing, such as, being pressed into specification is
467060 powder cores.Wherein, described compressing pressure uses 14～28t/cm2。
S70, anneals successively to the powder core of described molding and spray insulation processes.
Specifically, the powder core of described molding is made annealing treatment at 650～750 DEG C, annealing time
Less than 6h.After annealing, it is carried out spray insulation process, obtain required Fe-Si-Al magnetic core.Excellent
Selection of land, described spray insulation processes and uses epoxy resin is inorganic agent.
The preparation method of the Fe-Si-Al magnetic core that the present embodiment provides, in preparation process, passes through aerosolization
The flouring technology of ferrum sial, can be substantially reduced the loss of prepared magnetic core, and promote the bigoted ability of direct current；
By the mixing with firm gas atomization ferrum Si powder, can the most significantly promote the bigoted ability of direct current；Pass through
To specific aerosolization ferrum sial and the screening of aerosolization ferrum silicon granularity, make to prepare magnetic core in the bigoted ability of direct current
Relatively low-loss is obtained while being substantially improved；By compressing and annealing, obtained even tissue,
High intensity, high-compactness and the alloy soft magnetic powder core of high frequency pcrmeability；Processed by spray insulation, improve
The corrosion resistance of soft magnetic-powder core and time of use.
The technical scheme provided for a better understanding of the present invention, following being described separately with multiple instantiations should
The preparation method provided by the above embodiment of the present invention prepares the detailed process of Fe-based amorphous powder core, and surveys
Try its performance.
Embodiment two
Step one, aerosolization legal system obtains ferrum sial powder.
Step 2, uses the mode of same aerosolization to prepare ferrum Si powder.
Step 3, screening: sieve ferrum sial powder and ferrum Si powder respectively, ferrum sial powder leads to
Cross-200 sieve meshes；Ferrum Si powder passes through-325 mesh sieve mesh.
Step 4, passivation and insulating wrapped process: ferrum sial powder and ferrum Si powder are carried out successively respectively
Passivation and insulating wrapped process.First quantitative ferrum sial powder is poured in blender, stir a few minutes
After, adding the phosphoric acid liquid playing passivation effect, addition is the 1% of ferrum sial powder granular mass, mixing
Uniformly, at the uniform velocity stirring is until being dried；Treating that powder is dried, use silicon sol solution, addition is 1%；
Continue to stir；Treat that powder adds insulating compound glass powder with low melting point and silicone resin, addition after drying
For respectively 2% and 0.6%；It is eventually adding lubricant 0.3%.Ferrum Si powder uses same passivation with exhausted
Edge cladding processes.
Step 5, batch mixing: ferrum sial powder and the ferrum Si powder granule of different ratio are mixed.
Step 6, compressing: by ferrum sial powder and the ferrum Si powder granule compacting established practice of different ratio
Lattice are 467060 powder cores.
Step 7, annealing and spray insulation process: make annealing treatment the powder core of described molding, so
Afterwards powder core surface is carried out spray insulation process.
The present embodiment, by changing ferrum sial powder and the addition of ferrum Si powder in step 5, obtains 11
Example, numbered (1)-(11), each material addition refers to table 1.
Comparative example 1
This comparative example 1 is with the difference of embodiment two, and this comparative example 1 uses the broken legal system of tradition
The ferrum sial powder obtained.
The method preparing iron-silicon-aluminum soft magnet powder core that this comparative example 1 provides comprises the steps:
Step one, using the traditional handicraft broken ferrum sial powder of preparation is that raw material carries out comparative example 1 and tests.
Step 2, screening: the ferrum sial powder preparing described crush method sieves, for preferably
Realize contrast meaning, by broken ferrum sial powder also by-200 sieve meshes.
Step 3, Passivation Treatment and insulating wrapped: ferrum sial powder crush method prepared carries out phase Tongfang
The passivation of formula and insulating wrapped process.First the ferrum sial powder quantitative crush method obtained pours stirring into
In machine, after stirring a few minutes, adding the phosphoric acid liquid playing passivation effect, its addition is crush method ferrum silicon
The 1% of alumina particles quality, mix homogeneously, at the uniform velocity stirring, until being dried, are treated that powder is dried, are added silicon molten
Sol solution, addition is 1%；Continue to stir, treat that powder adds insulating compound low-melting glass after drying
Powder and silicone resin, addition is respectively 2% and 0.6%；It is eventually adding lubricant 0.3%.
Step 4, compressing: the insulated powder parti-cles of the broken ferrum sial prepared is pressed into specification
It is 467060 powder cores.
Step 7, annealing and spray insulation process: make annealing treatment the powder core of described molding, so
Afterwards powder core surface is carried out spray insulation process.
The powder core obtained in above-described embodiment two and comparative example 1 is carried out performance test, specifically, incites somebody to action
The powder core electric wire double wrap 15 that example in above-described embodiment two and comparative example 1 obtain is enclosed, test
Loss under 100kHz/50mT, test equipment uses the SY8219B-H tester that Japan's rock is rugged；Then
The copper cash using line footpath to be Φ 0.9mm, around 40 circles, test condition is set to 1V/1kHz, tests specified electricity
The inductance flowed down, and calculate the inductance ratio under 100Oe, test equipment uses Microtest 6377 instrument.
By the data record that obtains in Table 1.
Table 1 embodiment two and comparative example 1 the performance test results
From in above-mentioned table 1 contrast, the addition of aerosolization ferrum sial powder in the range of 50%-80%,
Loss and the bigoted ability of direct current reach optimal, and aerosolization ferrum sial powder compares traditional broken ferrum sial
Powder loss and the bigoted ability of direct current have promoted.Along with the increase of aerosolization ferrum sial powder addition,
The minimizing of aerosolization ferrum Si powder addition, is lost more and more lower, and the bigoted ability of direct current is gradually lowered；
Otherwise, along with the minimizing of aerosolization ferrum sial powder addition, the increase of aerosolization ferrum Si powder addition,
Being lost more and more higher, the bigoted ability of direct current gradually rises.Therefore, the present invention preferred aerosolization ferrum aluminum silicon powder
The addition at end is 50%-80%.
Embodiment three
The preparation method of the iron-silicon-aluminum soft magnet powder core that the present embodiment provides comprises the steps:
Step one, aerosolization legal system obtains ferrum sial powder.
Step 2, uses the mode of same aerosolization to prepare ferrum Si powder.
Step 3, screening: sieving ferrum sial powder and ferrum Si powder respectively, ferrum sial powder divides
Do not pass through-120 sieve meshes ,-200 sieve meshes ,-270 mesh；Ferrum Si powder passes through-200 sieve meshes ,-325 sieves respectively
Mesh.
Step 4, Passivation Treatment and insulating wrapped: respectively by ferrum sial powder and the ferrum silica flour of different meshes
End is passivated processing with insulating wrapped respectively.First quantitative ferrum sial powder is poured in blender,
After stirring a few minutes, adding the phosphoric acid liquid playing passivation effect, addition is aerosolization ferrum sial granule matter
The 1% of amount, mix homogeneously, at the uniform velocity stirring until being dried, treating that powder is dried, using silicon sol solution,
Addition is 1%；Continue to stir, treat that powder adds insulating compound glass powder with low melting point after drying, add
Amount is 2wt% and silicone resin 0.6%, is eventually adding lubricant 0.3%.Ferrum Si powder uses same
Passivation and insulating wrapped process.
Step 5, batch mixing: fixing ferrum sial powder and ferrum Si powder grain mixture ratio are 8:2.
Step 6, compressing: by ferrum sial powder and the compacting of ferrum Si powder granule of different grain size proportioning
Becoming specification is 467060 powder cores；
Step 7, annealing and spray insulation process: make annealing treatment the powder core of described molding, so
Afterwards powder core surface is carried out spray insulation process.
The present embodiment three, by powder size under sieve meshes different in change step 3, obtains 6 examples, compiles
Number it is (12)-(17), refers to table 2.
Comparative example 2
This comparative example 2 is with the difference of embodiment three, and this comparative example 2 is to ferrum sial powder and ferrum silica flour
The screening at end is different from embodiment three.Ferrum sial powder in this comparative example 2 passes through-500 sieve meshes, ferrum
Si powder passes through-500 sieve meshes.
Comparative example 3
This comparative example 3 is with the difference of comparative example 2, ferrum sial and atomization ferrum silicon in this comparative example 3
Mesh number is 100 mesh.
Observe the powder core that embodiment three obtains with comparative example 2 and 3, and it carried out the test of magnetic property,
And by test result record in table 2.Method of testing is: to the powder core electric wire double wrap 15 obtained
Circle, the loss under test 100kHz/50mT, the SY8219B-H that test equipment uses Japan's rock rugged surveys
Examination instrument；Then the copper cash using line footpath to be Φ 0.9mm, around 40 circles, test condition is set to 1V/1kHz；
Inductance under test rated current, and calculate the inductance ratio under 100Oe, test equipment uses Microtest
6377 instrument.
Table 2 embodiment three and the magnetism testing result of comparative example 3,4
By the contrast in upper table 2, embodiments of the invention are better than comparative example, aerosolization ferrum sial
The granularity of powder is at-120～-270 mesh, and the granularity of aerosolization ferrum Si powder is in-200 mesh～-325 mesh, loss
Ability bigoted with direct current is preferable.Comparative example 2 is too thin due to powder, is not suitable for compacting, and exists ultra-fine
Easily there is the hidden danger of blast in powder agglomeration, comparative example 3 is too thick due to powder, causes the core loss prepared
And the bigoted ability of direct current does not complys with requirement.Along with aerosolization ferrum sial powder gentle atomization ferrum Si powder
The reduction of granularity, inductance declines, is lost the lowest, and the bigoted ability of direct current is the best, it is contemplated that granularity is the thinnest,
The situation that production cost is the highest, the particle size range of the present invention preferred aerosolization ferrum sial powder is at-120 mesh
～-200 mesh, the particle size range of aerosolization ferrum Si powder is optimal at-200 mesh～-325 mesh.
Above example be premised on technical solution of the present invention under, be given implement in detail material component and
Concrete preparation process, but protection scope of the present invention is not limited to above-described embodiment.
In sum, the preparation method of the Fe-Si-Al magnetic core that the present embodiment provides, in preparation process,
By the flouring technology of aerosolization ferrum sial, the loss of prepared magnetic core can be substantially reduced, and promote direct current
Bigoted ability；By the mixing with firm gas atomization ferrum Si powder, can the most significantly promote direct current bigoted
Ability；By to specific aerosolization ferrum sial and the screening of aerosolization ferrum silicon granularity, make to prepare magnetic core directly
Flow while bigoted ability is substantially improved and obtain relatively low-loss；By compressing and annealing, obtain
Even tissue, high intensity, high-compactness and the alloy soft magnetic powder core of high frequency pcrmeability；By spraying absolutely
Edge processes, and improves corrosion resistance and the use time of soft magnetic-powder core.
Although it should be noted that present invention has been a certain degree of description, it will be apparent that, do not taking off
Under conditions of the spirit and scope of the present invention, the suitable change of each condition can be carried out.Can be understood as
The invention is not restricted to described embodiment, and be attributed to the scope of claim, it includes described each factor
Equivalent.
Above-described detailed description of the invention, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention detailed description of the invention and
, the protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, done
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the preparation method of a sendust core, it is characterised in that described preparation method includes:
S10, prepares ferrum sial powder；
S20, prepares ferrum Si powder；
S30, carries out specified sieve purpose screening respectively to described ferrum sial powder and described ferrum Si powder；Wherein, ferrum sial powder consists of-120 mesh～-270 mesh, ferrum Si powder consist of-200 mesh～-325 mesh；
S40, is passivated the powder after screening processing and insulating wrapped process respectively successively；
S50, the powder after step S40 being processed is mixed by different ratio；
S60, is pressed mixed powder；
S70, anneals successively to the powder core of described molding and spray insulation processes.
Preparation method the most according to claim 1, it is characterised in that described ferrum sial powder and ferrum Si powder all use aerosolization method to be prepared from.
Preparation method the most according to claim 1, it is characterised in that passivator described in step S40 uses phosphoric acid solution, and its addition is the 1～5% of powder quality.
Preparation method the most according to claim 1, it is characterised in that insulating wrapped described in step S40 processes particularly as follows: addition insulating compound and binding agent carry out insulating wrapped process；Wherein, insulating compound uses Ludox and glass powder with low melting point, and addition is respectively 0.5～5wt% and 0.5～5wt%；Binding agent uses silicone resin, and addition is 1～5wt%.
Preparation method the most according to claim 1, it is characterised in that in step S50, ferrum sial powder accounts for ferrum sial powder and the 20～80% of ferrum Si powder gross mass.
Preparation method the most according to claim 1, it is characterised in that in step S50, ferrum sial powder accounts for ferrum sial powder and the 50-80% of ferrum Si powder gross mass.
Preparation method the most according to claim 1, it is characterised in that pressure compressing described in step S60 uses 14～28t/cm2。
Preparation method the most according to claim 1, it is characterised in that make annealing treatment described in step S70 and carry out less than 6h at 650～750 DEG C.
Preparation method the most according to claim 1, it is characterised in that spray insulation described in step S70 processes and uses epoxy resin is inorganic agent.
10. the Fe-Si-Al magnetic core that prepared by the preparation method as described in any one of the claims 1-9.
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