CN108039260A - A kind of preparation method of 60 iron silica magnetic particle core materials of μ - Google Patents
A kind of preparation method of 60 iron silica magnetic particle core materials of μ Download PDFInfo
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- CN108039260A CN108039260A CN201711020574.5A CN201711020574A CN108039260A CN 108039260 A CN108039260 A CN 108039260A CN 201711020574 A CN201711020574 A CN 201711020574A CN 108039260 A CN108039260 A CN 108039260A
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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
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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 invention discloses a kind of preparation method of 60 iron silica magnetic particle core materials of μ, the preparation method includes powders mixing, phosphorating treatment step, insulating wrapped step, baking step, lubricating step, compression molding step, magnetic-field annealing processing step and surface coating step, and iron silica magnetic particle core made from this method has the characteristics that cost is low, low and direct current biasing excellent performance is lost.
Description
Technical field
The present invention relates to the preparation field of metal soft magnetic material, more particularly to a kind of preparation of 60 iron silica magnetic particle core materials of μ
Method.
Background technology
Metal soft magnetic composite material (also known as metal soft magnetic powder core) refers to be situated between by the ferromagnetic powder and insulation of micron dimension
A kind of metallic composite that matter is formed by compacting, there is some distributed air gaps between magnetic powder particle.Electric power
Electronic device is constantly the important original of metal soft magnetic powder core appearance to high frequency, energy-saving, high efficiency, the development trend of miniaturization
Cause.And metal soft magnetic material, soft magnetic ferrite and amorphous nanocrystalline soft magnetic material can not meet power electronics at the same time
These growth requirements of device.Wherein, it is that eddy-current loss is big in high frequency the shortcomings that silicon steel sheet, and produces very big noise；
The shortcomings that soft magnetic ferrites is that saturation flux density is small, and heat endurance is poor；Amorphous nanocrystalline soft magnetic material is in high frequency
Eddy-current loss is big, and saturation flux density is relatively low, and noise is larger, and saturation is easier under high current.And metal soft magnetic powder core integrates
The advantages of above-mentioned soft magnetic materials, eddy-current loss in high frequency is relatively low, also with saturation flux density is higher and direct current biasing
The characteristics such as function admirable.
Metal soft magnetic powder core is widely used in the modern electrics such as photovoltaic DC-to-AC converter, reactor, Switching Power Supply, ups power electricity
In sub-device, the iron core as devices such as PFC inductance, output inductor, resonant inductance, EMI inductance and flyback transformers.With
The high-end power electronic devices such as photovoltaic DC-to-AC converter and high frequency switch power development and electrical apparatus industry to EMC Requirements
Raising, metal soft magnetic powder core industry obtains fast development, its market demand constantly increases.
The metal magnetic powder core for being now widely used for the field is mainly iron silica magnetic particle core, although iron silica magnetic particle core cost
Low, DC stacked performance is high, but is lost higher (in f=100kHz, BmDuring=100mT, Pcv≈2100mW/cm3), fever is compared
Seriously, it is unfavorable for device energy-efficientization.Micro Nb and V element are added in patent CN102303115A in iron silicon materials
It can suppress the oxidation of ferro-silicium, prevent oxide to be mixed in intra-die, reduce coercivity, reduce the magnetic hysteresis damage of magnetic core
Consumption, but the incorporation of micro Nb and V elements is smaller to the resistivity effects of ferro-silicium, eddy-current loss is higher, therefore iron silicon
The overall losses of powder core are higher.Patent CN103824669A, CN103839642A, CN103839644A are respectively by iron silicon
The iron tantnickel powder core that different magnetic conductivities are made in nickel element is added on the basis of alloy, although DC stacked performance is more excellent,
It is to be lost in f=100kHz, BmDuring=100mT, Pcv≈1000mW/cm3, also have larger gap for device requirement.Cause
This is necessary the further power attenuation for reducing iron silica magnetic particle core to meet the requirement of device.
In conclusion since the loss of current iron silicon metal magnetic powder core is larger, its use scope have impact on.
The content of the invention
For overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of system of 60 iron silica magnetic particle core materials of μ
Preparation Method, iron silica magnetic particle core made from the preparation method have the characteristics that cost is low, low and direct current biasing excellent performance is lost.
The purpose of the present invention adopts the following technical scheme that realization：
A kind of preparation method of 60 iron silica magnetic particle core materials of μ, including：
Powders mixing：It is respectively the iron of+200 mesh, -200~+300 mesh, -300~+400 mesh, -400 mesh by granularity
Si powder particle is uniformly mixed to obtain mixed-powder；
Phosphorating treatment step：Triosephosphate solution is added magnetic powder surface treatment is carried out in mixed-powder, be stirred continuously straight
It is complete to acetone volatilization, obtain pretreatment powder；
Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and add pretreatment powder
In end, wherein, the additive amount for the mixed-powder that insulate is the 1-3% of pretreatment powder, and the addition of silicon powder is nickel-zinc ferrite
The 0.5-2% of powder weight, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains coated composite powder
End；
Baking step：Cladding powder is put into baking oven and carries out drying and processing, drying powder is obtained after drying；
Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；
Compression molding step：Compression molding processing is carried out to lubrication powder, obtains powder core blank；
Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；
Surface coating step：Powder core blank after magnetic-field annealing is handled carries out surface epoxy resin coating processing, obtains
To 60 iron silica magnetic particle core materials of μ.
Further, in powders mixing, granularity be respectively+200 mesh, -200~+300 mesh, -300~+400 mesh, -
The weight ratio of the iron Si powder particle of 400 mesh is (0.3-0.5)：(16-19)：(18-20)：(60-65).
Further, in phosphorating treatment step, the addition of triosephosphate solution is the 2-6% of mixed-powder weight；Phosphorus
The concentration of sour acetone soln is 5%, and weight ratio shared by phosphoric acid is 2%-10% in triosephosphate solution.
Further, in insulating wrapped step, binding agent acetone soln is phenolic resin acetone soln, epoxy resin acetone
Solution or silicone resin acetone soln.
Further, in insulating wrapped step, the addition of binding agent acetone soln is the 1- of pretreatment powder weight
3%, the percentage by weight of binding agent is 1-5% in binding agent acetone soln.
Further, in baking step, the temperature of drying is 50-150 DEG C, drying time 30-60min.
Further, in lubricating step, lubricant is in stearate, molybdenum disulfide, hexagonal boron nitride and aluminum stearate
One or more；The additive amount of lubricant is the 0.2-0.5% of drying powder weight.
Further, in compression molding step, pressure size 1800-2100MPa, dwell time 2-10s.
Further, in magnetic-field annealing processing step, the temperature of annealing is 650-800 DEG C, keeps the temperature 30-60min.
Further, intensive treatment step is further included between magnetic-field annealing processing step and surface coating step, at reinforcing
Step is managed specifically, the powder core blank after annealing is put into varnish, is taken out after soaking 15-30min at 50-100 DEG C.
The beneficial effects of the present invention are：
The preparation method of 60 iron silica magnetic particle core materials of μ of the present invention includes powders mixing, phosphorating treatment step, insulating bag
Cover step, baking step, lubricating step, compression molding step, magnetic-field annealing processing step and surface coating step, party's legal system
The iron silica magnetic particle core obtained has the characteristics that cost is low, low and direct current biasing excellent performance is lost.
Brief description of the drawings
Fig. 1 is the 60 iron silica magnetic particle core material service check result figures of μ of embodiment 1-3.
Embodiment
In the following, with reference to embodiment, the present invention is described further, it is necessary to which explanation is, what is do not collided
Under the premise of, new embodiment can be formed between various embodiments described below or between each technical characteristic in any combination.
A kind of preparation method of 60 iron silica magnetic particle core materials of μ, including：
Powders mixing：It is respectively the iron of+200 mesh, -200~+300 mesh, -300~+400 mesh, -400 mesh by granularity
Si powder particle is uniformly mixed to obtain mixed-powder；
Phosphorating treatment step：Triosephosphate solution is added magnetic powder surface treatment is carried out in mixed-powder, be stirred continuously straight
It is complete to acetone volatilization, obtain pretreatment powder；
Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and add pretreatment powder
In end, wherein, the additive amount for the mixed-powder that insulate is the 1-3% of pretreatment powder, and the addition of silicon powder is nickel-zinc ferrite
The 0.5-2% of powder weight, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains coated composite powder
End；
Baking step：Cladding powder is put into baking oven and carries out drying and processing, drying powder is obtained after drying；
Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；
Compression molding step：Compression molding processing is carried out to lubrication powder, obtains powder core blank；
Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；
Surface coating step：Powder core blank after magnetic-field annealing is handled carries out surface epoxy resin coating processing, obtains
To 60 iron silica magnetic particle core materials of μ.
As the mode that further carries out, in powders mixing, granularity be respectively+200 mesh, -200~+300 mesh, -
300~+400 mesh, the weight ratio of iron Si powder particle of -400 mesh are (0.3-0.5)：(16-19)： (18-20)：(60-65).
As the mode that further carries out, in phosphorating treatment step, the addition of triosephosphate solution is mixed-powder weight
The 2-6% of amount；The concentration of triosephosphate solution is 5%, and weight ratio shared by phosphoric acid is 2%-10% in triosephosphate solution.
As the mode that further carries out, in insulating wrapped step, binding agent acetone soln is phenolic resin acetone soln,
Epoxy resin acetone soln or silicone resin acetone soln.
As the mode that further carries out, in insulating wrapped step, the addition of binding agent acetone soln is pretreatment powder
The 1-3% of last weight, the percentage by weight of binding agent is 1-5% in binding agent acetone soln, binding agent correspond to phenolic resin,
Epoxy resin or silicone resin.
As the mode that further carries out, in baking step, the temperature of drying is 50-150 DEG C, drying time 30-
60min。
As the mode that further carries out, in lubricating step, lubricant is stearate, molybdenum disulfide, hexagonal boron nitride
With it is more than one or both of aluminum stearate；The additive amount of lubricant is the 0.2-0.5% of drying powder weight.
As the mode that further carries out, in compression molding step, pressure size 1800-2100MPa, dwell time 2-
10s。
As the mode that further carries out, in magnetic-field annealing processing step, the temperature of annealing is 650-800 DEG C, is protected
Warm 30-60min.
As the mode that further carries out, intensive treatment is further included between magnetic-field annealing processing step and surface coating step
Step, intensive treatment step soak 15- specifically, the powder core blank after annealing is put into varnish at 50-100 DEG C
Taken out after 30min.
Before mesh number plus can sign then represent leak through the mesh of the mesh number.Negative number representation can leak through the mesh of the mesh number,
I.e. particle size is less than mesh size；And positive number represents that the mesh of the mesh number cannot be leaked through, i.e. particle size is more than mesh size；
For example, particle is the mesh of -200 mesh~+300, that is, represent these particles can be leaked through from the mesh of 200 mesh and cannot be from the net of 300 mesh
Hole leaks through.
It is specific embodiment of the present invention below, used raw material, equipment etc. remove special limit in the following embodiments
It can be obtained outside fixed by buying pattern.
Embodiment 1：
A kind of preparation method of 60 iron silica magnetic particle core materials of μ, including：
Powders mixing：It is+200 mesh by granularity, the iron silica flour of -200~+300 mesh, -300~+400 mesh, -400 mesh
Last particle is respectively according to 0.3:19:18:62.7 weight ratio is uniformly mixed to obtain mixed-powder；
Phosphorating treatment step：The triosephosphate solution that concentration is 5% is added in mixed-powder and carries out magnetic powder surface treatment,
It is stirred continuously until acetone volatilization completely, obtains pretreatment powder；Wherein, phosphoric acid addition is the 0.3% of mixed-powder weight,
Weight ratio shared by phosphoric acid is 2% in triosephosphate solution；
Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and add pretreatment powder
In end, wherein, the additive amount for the mixed-powder that insulate is the 1% of pretreatment powder, and the addition of silicon powder is nickel-zinc ferrite powder
The 0.8% of last weight, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains cladding powder；It is viscous
It is silicone resin acetone soln to tie agent acetone soln；The addition of silicone resin acetone soln is the 2% of pretreatment powder weight,
The percentage by weight of silicone resin is 3% in silicone resin acetone soln.
Baking step：Cladding powder is put into baking oven and carries out drying and processing, the temperature of drying is 120 DEG C, drying time
For 40min, drying powder is obtained after drying；
Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；Lubricant is stearic acid
Salt, the additive amount of lubricant is the 0.3% of drying powder weight；
Compression molding step：Compression molding processing is carried out to lubrication powder, pressure size 1800MPa, dwell time 9s, obtains
To the powder core blank of 27mm*14.70mm*11.2mm；
Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；Move back
The temperature of fire processing is 650 DEG C, keeps the temperature 40min；
Intensive treatment step：Powder core blank after annealing is put into varnish, is taken after soaking 24min at 50 DEG C
Go out；
Surface coating step：Powder core blank after intensive treatment is subjected to surface epoxy resin coating, curing process, is obtained
To 60 iron silica magnetic particle core materials of μ.
Embodiment 2：
A kind of preparation method of 60 iron silica magnetic particle core materials of μ, including：
Powders mixing：It is+200 mesh by granularity, the iron silica flour of -200~+300 mesh, -300~+400 mesh, -400 mesh
Last particle is respectively according to 0.3:19:18:62.7 weight ratio is uniformly mixed to obtain mixed-powder；
Phosphorating treatment step：The triosephosphate solution that concentration is 5% is added in mixed-powder and carries out magnetic powder surface treatment,
It is stirred continuously until acetone volatilization completely, obtains pretreatment powder；Wherein, phosphoric acid addition is the 6% of mixed-powder weight, phosphorus
Weight ratio shared by phosphoric acid is 10% in sour acetone soln；
Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and add pretreatment powder
In end, wherein, the additive amount for the mixed-powder that insulate is the 3% of pretreatment powder, and the addition of silicon powder is nickel-zinc ferrite powder
The 1.2% of last weight, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains cladding powder；It is viscous
It is phenolic resin acetone soln to tie agent acetone soln；The addition of phenolic resin acetone soln is the 3% of pretreatment powder weight,
The percentage by weight of phenolic resin is 5% in phenolic resin acetone soln.
Baking step：Cladding powder is put into baking oven and carries out drying and processing, the temperature of drying is 120 DEG C, drying time
For 35min, drying powder is obtained after drying；
Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；Lubricant is stearic acid
Salt, the additive amount of lubricant is the 0.2% of drying powder weight；
Compression molding step：Compression molding processing is carried out to lubrication powder, pressure size 2100MPa, dwell time 3s, obtains
To powder core blank；
Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；Move back
The temperature of fire processing is 700 DEG C, keeps the temperature 30min；
Intensive treatment step：Powder core blank after annealing is put into varnish, is taken after soaking 160min at 70 DEG C
Go out；
Surface coating step：Powder core blank after intensive treatment is subjected to surface epoxy resin coating, curing process, is obtained
To 60 iron silica magnetic particle core materials of μ.
Embodiment 3：
A kind of preparation method of 60 iron silica magnetic particle core materials of μ, including：
Powders mixing：It is+200 mesh by granularity, the iron silica flour of -200~+300 mesh, -300~+400 mesh, -400 mesh
Last particle is respectively according to 0.3:19:18:62.7 weight ratio is uniformly mixed to obtain mixed-powder；
Phosphorating treatment step：The triosephosphate solution that concentration is 5% is added in mixed-powder and carries out magnetic powder surface treatment,
It is stirred continuously until acetone volatilization completely, obtains pretreatment powder；Wherein, phosphoric acid addition is the 0.3% of mixed-powder weight,
Weight ratio shared by phosphoric acid is 2% in triosephosphate solution；
Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and add pretreatment powder
In end, wherein, the additive amount for the mixed-powder that insulate is the 1% of pretreatment powder, and the addition of silicon powder is nickel-zinc ferrite powder
The 1.5% of last weight, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains cladding powder；It is viscous
It is epoxy resin acetone soln to tie agent acetone soln；The addition of epoxy resin acetone soln is the 2% of pretreatment powder weight,
The percentage by weight of epoxy resin acetone soln epoxy resin is 2%.
Baking step：Cladding powder is put into baking oven and carries out drying and processing, the temperature of drying is 100 DEG C, drying time
For 30min, drying powder is obtained after drying；
Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；Lubricant is stearic acid
Salt, the additive amount of lubricant is the 0.3% of drying powder weight；
Compression molding step：Compression molding processing is carried out to lubrication powder, pressure size 1800MPa, dwell time 5s, obtains
To powder core blank；
Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；Move back
The temperature of fire processing is 800 DEG C, keeps the temperature 60min；
Intensive treatment step：Powder core blank after annealing is put into varnish, is taken after soaking 15min at 100 DEG C
Go out；
Surface coating step：Powder core blank after intensive treatment is subjected to surface epoxy resin coating, curing process, is obtained
To 60 iron silica magnetic particle core materials of μ.
Effect assessment and performance detection
Service check is carried out to the 60 iron silica magnetic particle core materials of μ of embodiment 1-3, the results are shown in Figure 1.
As seen from Figure 1, the 60 iron silica magnetic particle core materials of μ of embodiment 1-3 have direct current biasing excellent performance, loss low, meet
The requirement of device.
The above embodiment is only the preferred embodiment of the present invention, it is impossible to the scope of protection of the invention is limited with this,
The change and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed scope.
Claims (10)
- A kind of 1. preparation method of 60 iron silica magnetic particle core materials of μ, it is characterised in that including：Powders mixing：It is respectively the iron silica flour of+200 mesh, -200~+300 mesh, -300~+400 mesh, -400 mesh by granularity Last particle is uniformly mixed to obtain mixed-powder；Phosphorating treatment step：Triosephosphate solution is added magnetic powder surface treatment is carried out in mixed-powder, be stirred continuously until third Ketone volatilization is complete, obtains pretreatment powder；Insulating wrapped step：Silicon powder, nickel-zinc ferrite powder are mixed into after insulation mixed-powder and added in pretreatment powder, Wherein, insulate mixed-powder additive amount for pretreatment powder 1-3%, the addition of silicon powder is nickel-zinc ferrite powder weight The 0.5-2% of amount, then adds binding agent acetone soln, is stirred continuously until acetone volatilization completely, obtains cladding powder；Baking step：Cladding powder is put into baking oven and carries out drying and processing, drying powder is obtained after drying；Lubricating step：Lubricant is added into drying powder, is stirred evenly, obtains lubrication powder；Compression molding step：Compression molding processing is carried out to lubrication powder, obtains powder core blank；Magnetic-field annealing processing step：Powder core blank is put into core magnetic field annealing furnace, makes annealing treatment and is taken out after keeping the temperature；Surface coating step：Powder core blank after magnetic-field annealing is handled carries out surface epoxy resin coating processing, obtains μ 60 Iron silica magnetic particle core material.
- 2. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In powders mixing, Granularity is respectively that+200 mesh, -200~+300 mesh, -300~+400 mesh, the weight ratio of iron Si powder particle of -400 mesh are (0.3-0.5)：(16-19)：(18-20)：(60-65).
- 3. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In phosphorating treatment step, The addition of triosephosphate solution is the 2-6% of mixed-powder weight；The concentration of triosephosphate solution is 5%, and triosephosphate is molten Weight ratio shared by phosphoric acid is 2%-10% in liquid.
- 4. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In insulating wrapped step, Binding agent acetone soln is phenolic resin acetone soln, epoxy resin acetone soln or silicone resin acetone soln.
- 5. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In insulating wrapped step, The addition of binding agent acetone soln is to pre-process the 1-3% of powder weight, the weight hundred of binding agent in binding agent acetone soln It is 1-5% to divide ratio.
- 6. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In baking step, drying Temperature be 50-150 DEG C, drying time 30-60min.
- 7. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In lubricating step, lubrication Agent is more than one or both of stearate, molybdenum disulfide, hexagonal boron nitride and aluminum stearate；The additive amount of lubricant is Dry the 0.2-0.5% of powder weight.
- 8. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：In compression molding step, Pressure size 1800-2100MPa, dwell time 2-10s.
- 9. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：Magnetic-field annealing processing step In rapid, the temperature of annealing is 650-800 DEG C, keeps the temperature 30-60min.
- 10. the preparation method of 60 iron silica magnetic particle core materials of μ as claimed in claim 1, it is characterised in that：Magnetic-field annealing processing step Suddenly intensive treatment step is further included between surface coating step, intensive treatment step is specifically, by the powder core hair after annealing Base is put into varnish, is taken out after soaking 15-30min at 50-100 DEG C.
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| CN108831731A (en) * | 2018-06-27 | 2018-11-16 | 四川东阁科技有限公司 | A kind of powder core resistant to high temperature |
| CN109754977A (en) * | 2019-01-30 | 2019-05-14 | 宁波韵升电子元器件技术有限公司 | A kind of high anti-corrosion molding inductance soft magnetism powder and preparation method thereof |
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