CN108597712A - A kind of iron powder heartwood and the method using iron powder heartwood manufacture powder core - Google Patents
A kind of iron powder heartwood and the method using iron powder heartwood manufacture powder core Download PDFInfo
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- CN108597712A CN108597712A CN201810543544.0A CN201810543544A CN108597712A CN 108597712 A CN108597712 A CN 108597712A CN 201810543544 A CN201810543544 A CN 201810543544A CN 108597712 A CN108597712 A CN 108597712A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 239000000843 powder Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 239000011812 mixed powder Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 8
- 235000013312 flour Nutrition 0.000 claims abstract description 7
- 238000012387 aerosolization Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 64
- 239000003822 epoxy resin Substances 0.000 claims description 16
- 229920000647 polyepoxide Polymers 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 7
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- -1 phosphoric acid chromic acid acetone Chemical compound 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 claims description 2
- 229910017435 S2 In Inorganic materials 0.000 claims description 2
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 2
- 239000010426 asphalt Substances 0.000 claims description 2
- 150000002576 ketones Chemical class 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 7
- 238000000748 compression moulding Methods 0.000 abstract description 5
- 229910001111 Fine metal Inorganic materials 0.000 abstract 1
- 235000013339 cereals Nutrition 0.000 abstract 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract 1
- 238000005253 cladding Methods 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000011259 mixed solution Substances 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000006227 byproduct Substances 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- WMYWOWFOOVUPFY-UHFFFAOYSA-L dihydroxy(dioxo)chromium;phosphoric acid Chemical compound OP(O)(O)=O.O[Cr](O)(=O)=O WMYWOWFOOVUPFY-UHFFFAOYSA-L 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- VDGJOQCBCPGFFD-UHFFFAOYSA-N oxygen(2-) silicon(4+) titanium(4+) Chemical compound [Si+4].[O-2].[O-2].[Ti+4] VDGJOQCBCPGFFD-UHFFFAOYSA-N 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 3
- LXJXRIRHZLFYRP-VKHMYHEASA-N D-glyceraldehyde 3-phosphate Chemical compound O=C[C@H](O)COP(O)(O)=O LXJXRIRHZLFYRP-VKHMYHEASA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000005007 epoxy-phenolic resin Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical group [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
Classifications
-
- 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
-
- B22F1/0003—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
A kind of iron powder heartwood and the method using iron powder heartwood manufacture powder core, using 1.0 2.5 microns of carbonyl iron dust of grain size, 3.5 5.5 micron carbonyl iron powder, 500 mesh aerosolization iron silica flours, silicone content is 3.5~6.5%.Above, the mixed solution of three kinds of mixed powder surface phosphoric acid and chromate does surface passivating treatment, and powder is dried, then powder is mixed with resin with super-fine metal oxide mixed liquor, realizes the cladding processing of secondary powder surface.Powdered lubricant is added after powder drying and does remover.By press compression moulding, baking processing and product surface spray coating obtain iron-dust core finished product.Technical process is simple to operation, and product surface has high resistivity, has high DC superposition characteristic, low loss, while product to have good mechanical performance.
Description
Technical field
The present invention relates to the selections of the magnetic material by Composition Region point, are related to the method for manufacturing magnetic core, espespecially a kind of
Iron powder heartwood and the method for manufacturing powder core using the iron powder heartwood.
Background technology
The metal magnetic heart refer to after mixing soft magnetic metal powder with insulating adhesive be molded and it is thermally treated obtain it is soft
Magnetic composite material, the metal magnetic heart are widely used in switch power converter, filter, AC/DC converters, DC/DC conversions
Device etc. is essential key components in electronic equipment.
Iron-dust core is widely used in due to cheap price and excellent performance makes each field.Currently on the market
Iron-dust core has two kinds of the common iron powder heart and carbonyl dust core, and the common iron powder heart is collectively constituted by reduced iron powder and megohmite insulant, and
Carbonyl iron dust is collectively constituted by carbonyl iron dust and megohmite insulant.It is general can iron-dust core due to use common reduced iron powder, at
This is low, but aberrations in property.Carbonyl dust core generally use carbonyl iron powder makees material, and carbonyl iron dust is ball-type, and granularity model
Enclose narrow, therefore powder deposits insufficient formability, slightly inferior properties.
Invention content
In view of the shortcomings of the prior art, the purpose of the present invention is to provide a kind of iron powder heartwood and use the iron powder heartwood system
The method for making powder core.Aim to solve the problem that iron-dust core DC superposition characteristic existing for present technology is poor, loss is high and Q values are low asks
Topic, provides a kind of preparation method of high superimposed characteristics high q-factor low magnetic permeability iron-dust core.
The technical solution adopted by the present invention to solve the technical problems is：A kind of iron powder heartwood is provided and uses the iron-dust core
The method that material manufactures powder core, the iron powder heartwood are characterized in that including following material component：1.5-2.5 micron carbonyl iron powder
20-50%, 3.5-5.5 micron carbonyl iron powder 10-20%, surplus are -500 mesh aerosolization iron silica flours, and wherein silicone content is iron silicon
3.5~6.5% in powder.
Present invention simultaneously provides a kind of manufacturing method of the powder core of the magnetic conductivity 35 using above-mentioned iron powder heartwood, features
It is to include the following steps：
Iron powder heartwood each component powder is uniformly mixed by S1, and phosphoric acid chromic acid acetone water (phosphoric acid and chromic acid are added into powder
Mass ratio is 20:1~0.5, the ratio of acetone and water is 10-20:1, the mass ratio that mixed liquor accounts for iron powder is 5~8%.) it is mixed
It closes liquid to be stirred, powder is made to be chemically reacted with liquid, oxide layer, reaction time 30- are formed in powder surface passivation
90 minutes, after acetone completely volatilization, powder is toasted 1-2 hours under the conditions of 50-70 degree, powder is made to dry；
S2, the powder obtained by step S1 is placed in temperature 150-200 degree, and oxidation processes are done to powder surface；
Third handle mixed liquor of superfine oxide and resin is added to described by S3 after gained powder dries after step S2
In powder, powder and mixed liquor are mixed, mixing time 20-50 minutes, are then placed in the container of sealing for use；
(resin account for mixed-powder ratio be 0.5~5%, superpower oxide account for mixed-powder ratio be 0.2~0.1.0%, third
The addition of ketone accounts for the 5-10% of mixed-powder.)
A part of powder obtained by step S3 is carried out the operation in step S6 by S4, and another part powder toasts after drying, temperature
Spend 150-180 degree, time 2-3 hour；
Resin acetone soln is added in the powder that step S4 has dried by S5, after stirring 5-30 minutes, crosses 30 mesh sieve,
It places 5-10 minutes, is sieved after 40 mesh, the powder after sieving is placed in iron pan, is dried under room temperature；(resin is asphalt mixtures modified by epoxy resin
The ratio of fat, resin point mixed metal powder is 0.5~2.5%, and the ratio of acetone point mixed metal powder is 5-10%.)
Powder obtained by step S3 is crossed 30 mesh sieve, after placing 5-10 minutes, is sieved after 40 mesh by S6；By the powder after sieving
End is placed in iron pan, is dried under room temperature；
The powder that step S4 was toasted is uniformly mixed by S7 with resin acetone soln, is stirred 20-50 minutes, and 30 mesh sieve is crossed,
After placing 5-10 minutes, is sieved after 40 mesh, the powder after sieving is placed in iron pan, is dried under room temperature；(resin is epoxy
The ratio of resin, resin point mixed metal powder is 0.5~2.5%, and the ratio of acetone point mixed metal powder is 5-10%.)
Powdered lubricant is added in S8, the powder that step S6 has been dried, and is uniformly mixed, and crosses 60 mesh sieve；
S9, the powder that step S5 is crossed to 60 mesh sieve are placed in press die die cavity and suppress blank；
The blank suppressed is done baking processing by S10 in an oven, and product first toasts to 1 hour under 100 degree, then
It is raised again under 150-200 degree, toasts 1-2 hours, obtain the powder core product of magnetic conductivity 35.
Further：
In step S1, phosphoric acid and chromic acid mass ratio are 20 in phosphoric acid chromic acid aqueous acetone solution:1~0.5, the ratio of acetone and water
Example is 10-20:1, the mass ratio that mixed liquor accounts for iron powder is 5~8%.
Resin described in step S3 is epoxy resin, phenolic resin or silicones, and the superfine oxide is nanoscale two
Silica, aluminium dioxide, magnesium dioxide or mica powder, the ratio that resin accounts for mixed-powder is 0.5~5%, and superpower oxide accounts for
The ratio of mixed-powder is 0.2~0.1.0%, and the addition of acetone accounts for the 5-10% of mixed-powder.
For step S5 with resin acetone soln described in step 7, the resin is epoxy resin, resin point mixed metal powder
The ratio at end is 0.5~2.5%, and the ratio of acetone point mixed metal powder is 5-10%.
Powdered lubricant in step S8 is day poem wax powder, and the addition of trade mark Twax-1405, lubricating material are 0.25~0.5%.
In step S9, it is pressure 5-10T/cm2 to suppress blank molding technological condition, dwell time 1-2 second.
The beneficial effects of the invention are as follows：Technical process is simple, and iron powder forms one layer of cause after Passivation Treatment in product surface
Close oxidation film, uniform the overlayed on iron powder surface of oxidation film be not easy-peel by chemical bond mode and iron powder intimate surface contact
From.Not only there is good electromagnetic property by the iron-dust core that method prepared above obtains, also there is good mechanical strength.
Description of the drawings
Fig. 1 is the performance comparison figure that the present invention implements obtained iron-dust core and comparison powder core.
Specific implementation mode
Embodiment one：A kind of method present invention iron powder heartwood and manufacture powder core using the iron powder heartwood, including it is as follows
Step：
1) it is 15% that take 1.5-2.5 micron carbonyl iron powder, which be 50%, 3.5-5.5 micron carbonyl iron powder, and surplus is -500 mesh
Aerosolization iron silica flour, silicone content 4% are uniformly mixed；
2) in being added to phosphoric acid chromic acid aqueous acetone solution 1) in iron powder, phosphoric acid chromic acid aqueous acetone solution accounts for iron powder ratio and is
10%, it is 2% that phosphoric acid, which accounts for iron powder ratio, and phosphoric acid and chromic acid ratio are 20:0.5, the ratio of acetone and water is 95:5；Connect after addition
Continuous stirring is adequately chemically reacted using mixed liquor with iron powder, and entire reaction carries out under normal temperature state, waits for solution
After volatilization completely, powder is toasted, 1.5 hours time under the conditions of 60 degree, obtains the iron powder for completing primary insulation；
3) bicomponent epoxy resin AB glue, A are taken：B=2:1, it is 1% that AB glue and iron powder, which are ratios, takes nanoscale titanium dioxide
Silicon is 0.5% with the ratio of iron powder, epoxy resin is added in acetone soln to be uniformly mixed with silica mixing is made
Liquid, the ratio that acetone accounts for iron powder are 10%；Mixed liquor is added in 2) powder, is stirred at ambient temperature to powder and is dried；
4) 0.35% powdered lubricant is added in step 3) powder, is uniformly mixed；
5) mixed powder that step 4) obtains is placed in dry-pressing formed in mold cavity, obtains iron-dust core blank, compression moulding pressure
Power is 8T/cm2, the dwell time is 2 seconds；
6) blank suppressed is heat-treated in an oven, air atmosphere, detailed process is, first by product in 100 degree of items
It is toasted 60 minutes under part, then heats to 200 degree, toasted 60 minutes；Then by product after taking out cooling in baking, product table
Face sprays last layer epoxy resin and completes iron-dust core making.
Embodiment two：A kind of method present invention iron powder heartwood and manufacture powder core using the iron powder heartwood, including it is as follows
Step：
1) it is 15% that take 1.5-2.5 micron carbonyl iron powder, which be 50%, 3.5-5.5 micron carbonyl iron powder, and surplus is -500 mesh
Aerosolization iron silica flour, silicone content 4% are uniformly mixed；
2) in being added to phosphoric acid chromic acid aqueous acetone solution 1) in iron powder, phosphoric acid chromic acid aqueous acetone solution accounts for iron powder ratio and is
10%, it is 2% that phosphoric acid, which accounts for iron powder ratio, and phosphoric acid and chromic acid ratio are 20:0.5, the ratio of acetone and water is 95:5；Connect after addition
Continuous stirring is adequately chemically reacted using mixed liquor with iron powder, and entire reaction carries out under normal temperature state, waits for solution
After volatilization completely, powder is toasted, 1.5 hours time under the conditions of 60 degree, obtains the iron powder for completing primary insulation；
3) powder in step 2) is taken, is placed in baking oven and toasts, 200 degree of temperature, the 7 hours time takes out from baking oven and dries；
4) bicomponent epoxy resin AB glue, A are taken：B=2:1, it is 1% that AB glue and iron powder, which are ratios, takes nanoscale titanium dioxide
Silicon is 0.5% with the ratio of iron powder, epoxy resin is added in acetone soln to be uniformly mixed with silica mixing is made
Liquid, the ratio that acetone accounts for iron powder are 10%；Mixed liquor is added in 3) powder, is stirred at ambient temperature to powder and is dried；
5) 0.35% powdered lubricant is added in step 4) powder, is uniformly mixed；
6) mixed powder that step 5) obtains is placed in dry-pressing formed in mold cavity, obtains iron-dust core blank, compression moulding pressure
Power is 8T/cm2, the dwell time is 2 seconds；
7) blank suppressed is heat-treated in an oven, air atmosphere, detailed process is, first by product in 100 degree of items
It is toasted 60 minutes under part, then heats to 200 degree, toasted 60 minutes；Then by product after taking out cooling in baking, product table
Face sprays last layer epoxy resin and completes iron-dust core making.
Embodiment three：A kind of method present invention iron powder heartwood and manufacture powder core using the iron powder heartwood, including it is as follows
Step：
1) it is 15% that take 1.5-2.5 micron carbonyl iron powder, which be 50%, 3.5-5.5 micron carbonyl iron powder, and surplus is -500 mesh
Aerosolization iron silica flour, silicone content 4% are uniformly mixed；
2) in being added to phosphoric acid chromic acid aqueous acetone solution 1) in iron powder, phosphoric acid chromic acid aqueous acetone solution accounts for iron powder ratio and is
10%, it is 2% that phosphoric acid, which accounts for iron powder ratio, and phosphoric acid and chromic acid ratio are 20:0.5, the ratio of acetone and water is 95:5；Connect after addition
Continuous stirring is adequately chemically reacted using mixed liquor with iron powder, and entire reaction carries out under normal temperature state, waits for solution
After volatilization completely, powder is toasted, 1.5 hours time under the conditions of 60 degree, obtains the iron powder for completing primary insulation；
3) powder in step 2) is taken, is placed in baking oven and toasts, 200 degree of temperature, the 7 hours time takes out from baking oven and dries；
4) bicomponent epoxy resin AB glue, A are taken：B=2:1, it is 1% that AB glue and iron powder, which are ratios, takes nanoscale titanium dioxide
Silicon is 0.5% with the ratio of iron powder, epoxy resin is added in acetone soln to be uniformly mixed with silica mixing is made
Liquid, the ratio that acetone accounts for iron powder are 10%；Mixed liquor is added in 3) powder, is stirred at ambient temperature to powder and is dried；
5) powder in step 4) is taken, is placed in baking oven and toasts, 200 degree of temperature, the 7 hours time takes out from baking oven and dries；
6) resin the third handle solution is uniformly mixed with the powder in step 5), incorporation time is 10 minutes, is kept at powder
In moisture condition, 30 mesh of rear mistake sieve is placed after five minutes, sieves, the powder after sieving is placed in iron pan, room temperature item after 40 mesh
It is dried under part；
7) 0.35% powdered lubricant is added in step 6) powder, is uniformly mixed；
8) mixed powder that step 7) obtains is placed in dry-pressing formed in mold cavity, obtains iron-dust core blank, compression moulding pressure
Power is 8T/cm2, the dwell time is 2 seconds；
9) blank suppressed is heat-treated in an oven, air atmosphere, detailed process is, first by product in 100 degree of items
It is toasted 60 minutes under part, then heats to 200 degree, toasted 60 minutes；Then by product after taking out cooling in baking, product table
Face sprays last layer epoxy resin and completes iron-dust core making.
Example IV (contrast groups)：
1) take 3.5-5.5 micron carbonyl irons powder as the iron powder for making iron-dust core；
2) in being added to triosephosphate solution 1) in iron powder, it is 10% that triosephosphate solution, which accounts for iron powder ratio, and phosphoric acid accounts for
Iron powder ratio is 2%；It continuously stirs after addition and is adequately chemically reacted with iron powder using mixed liquor, entire reaction is normal
It is carried out under state of temperature, after solution evaporation is complete, powder is toasted under the conditions of 60 degree, 1.5 hours time, obtains completion one
The iron powder of minor insulation；
3) bicomponent epoxy resin AB glue, A are taken：B=2:1, it is 1% that AB glue and iron powder, which are ratios, takes nanoscale titanium dioxide
Silicon is 0.5% with the ratio of iron powder, epoxy resin is added in acetone soln to be uniformly mixed with silica mixing is made
Liquid, the ratio that acetone accounts for iron powder are 10%；Mixed liquor is added in 2) powder, is stirred at ambient temperature to powder and is dried；
4) 0.35% powdered lubricant is added in step 3) powder, is uniformly mixed；
5) mixed powder that step 4) obtains is placed in dry-pressing formed in mold cavity, obtains iron-dust core blank, compression moulding pressure
Power is 8T/cm2, the dwell time is 2 seconds；
6) blank suppressed is heat-treated in an oven, air atmosphere, detailed process is, first by product in 100 degree of items
It is toasted 60 minutes under part, then heats to 200 degree, toasted 60 minutes.Then by product after taking out cooling in baking, product table
Face sprays last layer epoxy resin and completes iron-dust core making.
The performance of the iron-dust core that the embodiment of the present invention obtains and comparative example powder core is as shown in Figure 1.
It will be seen from figure 1 that experimental group 1 is opposite with contrast groups in the present invention, the loss for the iron powder that the present invention obtains
It is lost less than contrast groups, and DC superposition characteristic is better than contrast groups, quality factor q value is also obviously better than contrast groups.
This experiment is mixed using varigrained powder and does original powder, and powder is dried in insulation plus course powder
Roasted journey can significantly improve the state and insulation characterisitic of the insulating film on powder surface, help to improve molded product density,
The mouldability between powder is improved, properties of product are improved.
The present invention has the advantages that：
1) iron-dust core product is made in such a way that varigrained carbonyl iron dust is mixed with gas atomization iron powder silicon, obtained
Iron-dust core has good electromagnetic property, can significantly improve the direct current of iron-dust core, and low, quality factor q value height is lost.
2) after being passivated film process to iron powder surface in such a way that chromic acid is combined with phosphoric acid, powder is in 150-200
It spends constant temperature to toast 5-7 hours, passivating film is stablized in further solidification.The compactness of oxidation film is improved, powder surface resistivity is improved,
Iron-dust core eddy-current loss is reduced, the quality factor of iron-dust core are improved.
3) it uses superfine oxide to make secondary insulating with resin, so that two kinds of substances is uniformly sticked to iron powder by wet mixing process
Surface, first can improve the insulating properties on powder surface, improve powder surface resistivity, reduce eddy-current loss improving quality because
Number.Second can improve the mouldability of powder, improve the density of molded blank, improve the intensity of blank after molding.
4) powder after secondary insulating is in temperature 150-180 degree, time 2-3 hour.Baking can make resin in powder solid
Change, improve powder surface state, improves the compactness and insulating properties of powder surface oxidation insulating layer.Improve powder sheet resistance
Rate reduces eddy-current loss, while improving quality factor.
5) powder is crossed after 30 mesh sieve under moisture state and sieves granulation after 40 mesh, the powder obtained in this way contributes to powder
In the die for molding blank of big press.
The blank suppressed is done into baking processing in an oven, the temperature 150-280 degree of baking can be eliminated in product
Internal stress, while the intensity of product can be improved.
Claims (6)
1. a kind of iron powder heartwood, it is characterised in that including following material component：1.5-2.5 micron carbonyl iron powder 20-50%, 3.5-
5.5 micron carbonyl iron powder 10-20%, surplus be -500 mesh aerosolization iron silica flours, wherein silicone content be iron silica flour in 3.5~
6.5%.
2. using the method for iron powder heartwood manufacture powder core described in claim 1, it is characterised in that include the following steps：
The iron powder heartwood each component powder is uniformly mixed by S1, into powder be added phosphoric acid chromic acid acetone water mixed liquor into
Row stirring, makes powder be chemically reacted with liquid, and oxide layer is formed in powder surface passivation, and the reaction time is 30-90 minutes,
After acetone completely volatilization, powder is toasted 1-2 hours under the conditions of 50-70 degree, powder is made to dry；
S2, the powder obtained by step S1 is placed in temperature 150-200 degree, and oxidation processes are done to powder surface；
Third handle mixed liquor of superfine oxide and resin is added to the powder by S3 after gained powder dries after step S2
In, powder and mixed liquor are mixed, mixing time 20-50 minutes, are then placed in the container of sealing for use；
S4 toasts the half of powder obtained by step S3, and baking temperature 150-180 degree, then dries at time 2-3 hour；
Resin acetone soln is added in the powder that step S4 has dried by S5, after stirring 5-30 minutes, is crossed 30 mesh sieve, is placed
It 5-10 minutes, is sieved after 40 mesh, by drying at ambient temperature after sieving；
Powder obtained by step S5 is uniformly mixed by S6 with resin acetone soln, is stirred 20-50 minutes, is crossed 30 mesh sieve, is placed 5-10
After minute, is sieved after 40 mesh, the powder after sieving is placed in iron pan, is dried under room temperature；
S7, the other half by the powder obtained by step S3 are crossed 30 mesh sieve, after placing 5-10 minutes, are sieved after 40 mesh；After being sieved
Powder be placed in iron pan, dry under room temperature；
Powdered lubricant is added in S8, the powder that step S6 has been dried, and is uniformly mixed, and crosses 60 mesh sieve；Step S5 is crossed 60 mesh sieve by S9
Powder be placed in press die die cavity and suppress blank；The blank suppressed is done baking processing by S10 in an oven, first will
Product toasts 1 hour under 100 degree, is then raised again under 150-200 degree, toasts 1-2 hours, obtains the powder core of magnetic conductivity 35
Product.
3. the manufacturing method of powder core according to claim 2, it is characterised in that：In step S1, phosphoric acid chromic acid acetone water
Phosphoric acid and chromic acid mass ratio are 20 in solution:1~0.5, the ratio of acetone and water is 10-20:1, mixed liquor accounts for the quality of iron powder
Than being 5~8%.
4. the manufacturing method of powder core according to claim 2, it is characterised in that：Resin described in step S3 is asphalt mixtures modified by epoxy resin
Fat, phenolic resin or silicones, the superfine oxide be nanometer grade silica, aluminium dioxide, magnesium dioxide or mica powder,
Resin account for mixed-powder ratio be 0.5~5%, superpower oxide account for mixed-powder ratio be 0.2~0.1.0%, third
The addition of ketone accounts for the 5-10% of mixed-powder.
5. the manufacturing method of powder core according to claim 2, it is characterised in that：Powdered lubricant in step S8 is day poem wax
The addition of powder, trade mark Twax-1405, lubricating material is 0.25~0.5%.
6. the manufacturing method of powder core according to claim 2, it is characterised in that：In step S9, blank molding is suppressed
Process conditions are pressure 5-10T/cm2, dwell time 1-2 second.
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| CN111524697A (en) * | 2020-04-20 | 2020-08-11 | 东莞市铭燕电子有限公司 | Preparation method of 35 carbonyl iron powder core with magnetic conductivity |
| CN113426994A (en) * | 2021-06-05 | 2021-09-24 | 合泰盟方电子（深圳）股份有限公司 | Passivation treatment process of soft magnetic metal powder for inductor forming |
| CN113488331A (en) * | 2021-07-20 | 2021-10-08 | 湖南圆奕新材料有限公司 | Preparation process of soft magnetic powder core |
| CN114582580A (en) * | 2022-05-06 | 2022-06-03 | 天通控股股份有限公司 | Soft magnetic metal powder and preparation method thereof |
| CN114582580B (en) * | 2022-05-06 | 2022-07-29 | 天通控股股份有限公司 | Soft magnetic metal powder and preparation method thereof |
| CN116130237A (en) * | 2022-12-12 | 2023-05-16 | 北京七星飞行电子有限公司 | Preparation method of carbonyl iron powder magnetic core with 35 magnetic permeability and high Q value |
| CN116130237B (en) * | 2022-12-12 | 2023-10-13 | 北京七星飞行电子有限公司 | Preparation method of carbonyl iron powder magnetic core with 35 magnetic permeability and high Q value |
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