CN114446628B - Soft magnetic composite material and preparation method and application thereof - Google Patents
Soft magnetic composite material and preparation method and application thereof Download PDFInfo
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- CN114446628B CN114446628B CN202210106133.1A CN202210106133A CN114446628B CN 114446628 B CN114446628 B CN 114446628B CN 202210106133 A CN202210106133 A CN 202210106133A CN 114446628 B CN114446628 B CN 114446628B
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000011265 semifinished product Substances 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 229910002796 Si–Al Inorganic materials 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 238000001962 electrophoresis Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000004513 sizing Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 34
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 12
- 239000010410 layer Substances 0.000 description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 239000006247 magnetic powder Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000000498 ball milling Methods 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229910000702 sendust Inorganic materials 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- -1 iron-silicon-aluminum Chemical compound 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention provides a soft magnetic composite material, a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) Smelting the Fe-Si-Al alloy, performing a piece throwing treatment, and crushing a material obtained by the piece throwing treatment to obtain powder; (2) Performing insulating coating treatment on the powder obtained in the step (1) to obtain a semi-finished product; (3) The soft magnetic composite material is obtained by carrying out hot press forming and stress relief annealing on the semi-finished product, and the invention realizes material forming through a set of process routes of smelting, quick cooling throwing piece, throwing piece crushing, insulating coating, hot press forming and stress relief annealing, so that the material has high magnetic property and good complex shape formability, and the problem that the material performance is difficult to further improve due to factors such as uneven granularity, difficult insulating layer coating and the like is solved.
Description
Technical Field
The invention belongs to the technical field of soft magnetic composite materials, and relates to a soft magnetic composite material, a preparation method and application thereof.
Background
The soft magnetic composite material has the characteristics of high saturation magnetic flux density, high magnetic permeability and low high-frequency loss, and is a novel magnetic material which is widely focused in the fields of new energy driving motors, power electronics, communication and the like in the future. The existing soft magnetic composite material is prepared by preparing pure iron matrix magnetic powder particles by a powder metallurgy method, coating an insulating layer of an organic substance or an inorganic substance on the surface of the magnetic powder, and finally forming a block-shaped magnet by compression sintering and other processes. The magnet prepared by the method has the problems of low material saturation magnetic flux density (usually, the maximum saturation magnetic density is not more than 1.8T), large high-frequency iron loss and the like due to the factors of uneven particle size distribution of magnetic powder particles (about 2-300 mu m), lower compression sintering density (about 6.5g/cm 3-7.2g/cm3 density), uneven coating of an insulating layer, difficult realization and the like.
CN101996723A adopts the control oxidation method to generate a layer of Fe 3O4 shell layer on the surface of iron powder particles in situ to form Fe/Fe 3O4 composite soft magnetic powder, the composite soft magnetic powder is mixed with a proper amount of silicon resin, and then a powder metallurgy pressing process is adopted to prepare a high-performance Fe/Fe 3O4 soft magnetic composite material block or part.
CN101658932a is to put water atomized iron powder or reduced iron powder into phosphoric acid solution to stir, then to filter and wash, and then to put into saponification liquid to stir, finally to obtain the insulating iron powder coated with phosphate and zinc stearate on the surface. The soft magnetic composite material prepared by phosphoric acid cladding has poor thermal stability, no effective heat treatment process after compression molding, low magnetic property and high loss, and can not meet higher application requirements.
The soft magnetic composite material with high magnetic induction intensity, high saturation magnetic density and low iron loss is necessary to solve the problems of low compaction density, low magnetic property, uneven distribution of an insulating coating layer or a compound layer, unstable performance, low resistivity of a coating layer and an iron powder body and the like of the soft magnetic composite material in the prior art.
Disclosure of Invention
The invention aims to provide a soft magnetic composite material and a preparation method and application thereof, the invention adopts a set of process routes of smelting, quick cooling throwing, throwing crushing, insulating coating, hot press forming and stress relief annealing, the material forming is realized, so that the material has high magnetic performance and good complex shape forming property, and the problem that the material performance is difficult to further improve due to factors such as uneven granularity, difficult coating of an insulating layer and the like is solved.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing a soft magnetic composite material, the method comprising the steps of:
(1) Smelting the Fe-Si-Al alloy, performing a piece throwing treatment, and crushing a material obtained by the piece throwing treatment to obtain powder;
(2) Performing insulating coating treatment on the powder obtained in the step (1) to obtain a semi-finished product;
(3) And carrying out hot press molding and stress relief annealing on the semi-finished product to obtain the soft magnetic composite material.
The invention provides an iron-silicon alloy bulk material which is a flaky fragment obtained by melt-spun crushing, is different from a bulk material of nearly spherical particles or powder obtained by powder metallurgy in the prior art, improves the problem that the material performance is difficult to further improve due to uneven granularity, difficult coating of an insulating layer and other factors, and the obtained soft magnetic composite material has high magnetic induction intensity, high saturated magnetic density and low iron loss, can meet the application requirements of power frequency to 2kHz (the main working frequency range of high-performance motors such as automobile driving motors) and has good manufacturability, and mass production and application are easy to realize.
Compared with the spherical powder plus sintering process, the throwing process adopted by the invention has three main advantages, namely, the crystal grains are finer by quick cooling throwing, a thin (less than or equal to 300 mu m) and uniform sheet layer can be obtained by controlling process parameters, and the cross section area can be effectively reduced by assisting with an insulating coating, so that the eddy current loss in a magnetic field is reduced; secondly, compared with spherical powder, the flake is not easy to agglomerate, and the surface tension of the insulating mixed solution can be fully utilized for uniform coating, so that the insulating coating can be uniformly coated; thirdly, a high-density blank is easier to obtain through a hot pressing process.
Preferably, the mass fraction of silicon in the sendust is 3-6.5% based on 100% of the mass of the sendust in step (1), for example: 3%, 3.5%, 4%, 5%, 6% or 6.5%, etc.
Preferably, the mass fraction of aluminum in the iron-silicon-aluminum alloy is 0.1 to 1%, for example: 0.1%, 0.3%, 0.5%, 0.8% or 1%, etc.
Preferably, the mass fraction of silicon in the sendust is 92.5-96.9%, for example: 92.5%, 93%, 94%, 95%, 96% or 96.9%, etc.
The invention adopts high silicon steel material with silicon content of 3-6.5%, the silicon content of the component can effectively reduce the resistivity of the material, thereby reducing the iron loss and simultaneously obtaining excellent magnetic performance.
Preferably, the sheet throwing treatment in the step (1) specifically comprises casting the melted alloy melt on the surface of a copper roller which rotates rapidly, and carrying out rapid cooling sheet throwing.
Preferably, the initial temperature of the melt is 1400 to 1600 ℃, for example: 1400 ℃, 1450 ℃, 1500 ℃, 1550 ℃, 1600 ℃, or the like.
Preferably, the copper roller is cooled by circulating water.
Preferably, the temperature of the circulating water is less than or equal to 95 ℃, for example: 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃, 95 ℃ or the like.
Preferably, the diameter of the copper roller is 150-300 mm, for example: 150mm, 180mm, 200mm, 250mm or 300mm, etc.
Preferably, the surface linear velocity of the copper roller is 6 to 15m/s, for example: 6m/s, 8m/s, 10m/s, 12m/s, 15m/s, etc.
Preferably, the maximum external dimension of the material obtained after the throwing piece treatment in the step (1) is less than or equal to 100mm, for example: 1mm, 5mm, 10mm, 20mm, 50mm, 100mm, etc.
Preferably, the thickness of the material obtained after the throwing piece treatment is 0.02-0.3 mm, for example: 0.02mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, etc.
Preferably, the crushing treatment comprises a mechanical crushing method and/or a physicochemical crushing method.
Preferably, the powder has a maximum external dimension of 0.01 to 5mm, for example: 0.01mm, 0.1mm, 0.5mm, 1mm, 3mm, 5mm, etc.
Preferably, the insulating coating treatment in step (2) includes any one or a combination of at least two of liquid coating, spraying or electrophoresis, and is preferably liquid coating.
Preferably, the liquid phase coating specifically comprises the steps of mixing a high-temperature-resistant inorganic insulating coating material with a dispersing agent and Jin Runji to obtain a sol, mixing powder with the sol, and drying to obtain a semi-finished product.
Preferably, the high temperature resistant inorganic insulating coating material comprises CaF 2.
Preferably, the thickness of the semi-finished surface insulation layer is 0.5-3 μm, for example: 0.5 μm, 1 μm, 2 μm, 2.5 μm or 3 μm, etc.
Preferably, the temperature of the hot press molding in the step (3) is 800-1500 ℃, for example: 800 ℃, 900 ℃, 1000 ℃, 1200 ℃ or 1500 ℃, etc.
Preferably, the stress relief anneal is performed under an inert atmosphere.
Preferably, the temperature of the stress relief annealing is 600 to 1200 ℃, for example: 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃ or 1200 ℃ and the like.
Preferably, the time of the stress relief annealing is 0.5 to 2 hours, for example: 0.5h, 0.8h, 1h, 1.5h, 2h, etc.
In a second aspect, the present invention provides a soft magnetic composite material made by the method of the first aspect.
In a third aspect, the present invention provides the use of a soft magnetic composite material as described in the second aspect, in an inductor, a sensor, an electromagnetic drive or a magnetic field shield.
Compared with the prior art, the invention has the following beneficial effects:
(1) The process method is easy to control and suitable for mass production and manufacture, and meanwhile, has near net forming conditions and advantages by adjusting the hot pressing die.
(2) The soft magnetic composite material prepared by the invention has high magnetic performance and low iron loss, the saturated magnetic density Bs can reach more than 1.63T, the maximum relative magnetic permeability mu r can reach more than 1720, and the total loss P10/400 can reach less than 24.8W/kg.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a soft magnetic composite material according to the present invention.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a soft magnetic composite material, and the preparation method of the soft magnetic composite material comprises the following steps:
(1) Smelting Fe-Si-Al alloy with the silicon mass content of 5%, the aluminum mass content of 0.8% and the iron mass content of 94.2% into a molten liquid, controlling the initial temperature to 1550 ℃ and pouring the molten liquid onto the surface of a copper roller rotating at the surface linear speed of 10m/s, wherein the diameter of the copper roller is 200mm, obtaining a throwing piece with the thickness of 0.15mm and the outer diameter of less than or equal to 100mm through circulating water cooling at 90 ℃, and performing ball milling treatment on the throwing piece to obtain flake powder with the outer diameter of 3 mm;
(2) Mixing calcium difluoride, phosphoric acid and lithium stearate to prepare sol, mixing the powder obtained in the step (1) with the sol, and drying to obtain a semi-finished product with the thickness of an insulating layer of 1 mu m;
(3) And (3) performing compression molding on the semi-finished product at 1200 ℃, and performing stress relief annealing for 1h at 850 ℃ to obtain the soft magnetic composite material.
The process flow diagram of the preparation method is shown in fig. 1.
Example 2
The embodiment provides a soft magnetic composite material, and the preparation method of the soft magnetic composite material comprises the following steps:
(1) Smelting Fe-Si-Al alloy with the silicon mass content of 4%, the aluminum mass content of 0.5% and the iron mass content of 95.5% into a molten liquid, controlling the initial temperature to 1580 ℃ and pouring the molten liquid onto the surface of a copper roller rotating at the surface linear speed of 12m/s, wherein the diameter of the copper roller is 200mm, obtaining a throwing piece with the thickness of 0.12mm and the outer diameter of less than or equal to 100mm through circulating water cooling at 90 ℃, and performing ball milling treatment on the throwing piece to obtain powder with the outer diameter of 3 mm;
(2) Mixing calcium difluoride, phosphoric acid and lithium stearate to prepare sol, mixing the powder obtained in the step (1) with the sol, and drying to obtain a semi-finished product with the thickness of an insulating layer of 1 mu m;
(3) And (3) performing compression molding on the semi-finished product at 1300 ℃, and performing stress relief annealing for 1h at 900 ℃ to obtain the soft magnetic composite material.
Example 3
This example differs from example 1 only in that the alloy of step (1) has a mass fraction of silicon of 2%, a mass fraction of iron of 97.2% and the other conditions and parameters are identical to those of example 1.
Example 4
This example differs from example 1 only in that the alloy of step (1) has a mass fraction of silicon of 7%, a mass fraction of iron of 92.2% and the other conditions and parameters are identical to those of example 1.
Example 5
This example differs from example 1 only in that the copper roller surface linear velocity in step (1) was 5m/s, and other conditions and parameters were identical to those in example 1.
Example 6
This example differs from example 1 only in that the copper roller surface linear velocity in step (1) was 20m/s, and other conditions and parameters were identical to those in example 1.
Comparative example 1
The comparative example is different from example 1 only in that the step (1) is not performed with the throwing, the cooling and blocking are directly performed with ball milling, and other conditions and parameters are exactly the same as those of example 1.
Comparative example 2
Materials were prepared using CN101658932a as a comparative example.
Performance test:
the soft magnetic composite materials obtained in examples 1 to 6 and comparative examples 1 to 2 were tested for magnetic permeability, specific total loss and saturation magnetic density, and the test results are shown in table 1:
TABLE 1
As can be seen from Table 1, the soft magnetic composite materials prepared in the invention have high magnetic properties and low iron loss, the saturated magnetic density Bs can be more than 1.63T, the maximum relative permeability μr can be more than 1720, and the total loss P10/400 can be less than 24.8W/kg.
As can be seen from comparison of examples 1 and examples 3 to 4, the use of the mass fraction of silicon in the ferroalloy affects the performance of the soft magnetic composite material, the mass fraction of silicon in the ferroalloy is controlled to be 3 to 6.5%, the performance of the soft magnetic composite material is better, if the mass fraction of silicon is too low, the total loss of the material ratio is increased, and if the mass fraction of silicon is too high, the magnetic conductivity and the saturation magnetic density are affected.
As can be seen from comparison of the embodiment 1 and the embodiment 5-6, the surface linear velocity of the copper roller can influence the performance of the soft magnetic composite material in the process of throwing the sheet, the surface linear velocity of the copper roller is controlled to be 6-15 m/s, the performance of the soft magnetic composite material is good, if the surface linear velocity of the copper roller is too slow, the material ratio total loss is obviously increased, and if the surface linear velocity of the copper roller is too fast, the saturation magnetic density and the magnetic permeability of the material are both affected to a certain extent.
The comparison of the embodiment 1 and the comparative example 1 shows that the process of the invention has important influence on the material performance, the throwing piece can effectively reduce the sectional area of the thin sheet, and the insulating coating is added, so that the performance can be effectively improved, and the iron loss can be reduced.
As can be seen from the comparison of example 1 and comparative example 2, the properties of the materials prepared according to the invention are significantly improved over comparative example 2; the invention makes the finally obtained soft magnetic composite material have very good magnetic performance and loss characteristic under the working condition of medium and low frequency (taking 400Hz typical working condition as an example) through the comprehensive innovation of the material body and the forming process, and has remarkable performance improvement compared with the prior published patent material. Is very suitable for the application in the electromagnetic driving fields of driving motors of new energy automobiles and the like.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (13)
1.A method for preparing a soft magnetic composite material, the method comprising the steps of:
(1) Smelting the Fe-Si-Al alloy, performing a piece throwing treatment, and crushing a material obtained by the piece throwing treatment to obtain powder;
(2) Performing insulating coating treatment on the powder obtained in the step (1) to obtain a semi-finished product;
(3) Carrying out hot press molding and stress relief annealing on the semi-finished product to obtain the soft magnetic composite material;
Wherein, the mass fraction of silicon in the Fe-Si-Al alloy is 5-6.5% based on 100% of the mass of the Fe-Si-Al alloy in the step (1); the mass fraction of aluminum in the Fe-Si-Al alloy is 0.1-1%;
The sheet throwing treatment in the step (1) specifically comprises the steps of pouring molten alloy onto the surface of a copper roller which rotates rapidly, and carrying out rapid cooling sheet throwing; the surface linear speed of the copper roller is 6-15 m/s; the diameter of the copper roller is 150-300 mm; the initial temperature of the melt is 1400-1600 ℃; the copper roller is cooled by circulating water; the temperature of the circulating water is less than or equal to 95 ℃; the maximum external dimension of the material obtained after the throwing piece treatment is less than or equal to 100mm; the thickness of the material obtained after the throwing piece treatment is 0.02-0.3 mm;
And (3) the maximum external dimension of the powder in the step (1) is 0.5-5 mm.
2. The method of claim 1, wherein the disruption treatment comprises a mechanical disruption and/or a physicochemical disruption.
3. The method of claim 1, wherein the insulating coating treatment in step (2) comprises any one or a combination of at least two of liquid coating, spraying or electrophoresis.
4. The method according to claim 3, wherein the insulating coating treatment in the step (2) is a liquid phase coating.
5. The method according to claim 4, wherein the liquid phase coating comprises mixing the high temperature resistant inorganic insulating coating material with a dispersing agent and a sizing agent to obtain a sol, mixing the powder and the sol, and drying to obtain a semi-finished product.
6. The method of manufacturing of claim 5, wherein the high temperature resistant inorganic insulating coating material comprises CaF 2.
7. The method according to claim 5, wherein the thickness of the semi-finished product surface insulation layer is 0.5-3 μm.
8. The method according to claim 1, wherein the hot press molding temperature in the step (3) is 800-1500 ℃.
9. The method of claim 1, wherein the stress relief annealing is performed in an inert atmosphere.
10. The method of claim 1, wherein the temperature of the stress relief anneal is 600-1200 ℃.
11. The method of claim 1, wherein the stress relief anneal is performed for a period of 0.5 to 2 hours.
12. A soft magnetic composite material, characterized in that it is produced by a method according to any one of claims 1-11.
13. Use of a soft magnetic composite material according to claim 12, wherein the soft magnetic composite material is applied in an inductor, a sensor, a low frequency filter, an electromagnetic drive or a magnetic field shield.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217835A (en) * | 2013-06-05 | 2014-12-17 | 宋艳 | Method for manufacturing sendust core with effective magnetic permeability of 125 Henrys per meter |
| CN110534282A (en) * | 2019-09-02 | 2019-12-03 | 山东汇嘉磁电科技有限公司 | High magnetic permeability sendust powder preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002060915A (en) * | 2000-08-08 | 2002-02-28 | Daido Steel Co Ltd | Fe-Si-Al BASED ALLOY THIN STRIP AND ITS PRODUCTION METHOD |
| JP2005317679A (en) * | 2004-04-27 | 2005-11-10 | Fuji Electric Holdings Co Ltd | Magnetic device and its manufacturing method |
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