CN116825468B - Iron-cobalt magnetic core and preparation method and application thereof - Google Patents
Iron-cobalt magnetic core and preparation method and application thereof Download PDFInfo
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 46
- QVYYOKWPCQYKEY-UHFFFAOYSA-N [Fe].[Co] Chemical compound [Fe].[Co] QVYYOKWPCQYKEY-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910002796 Si–Al Inorganic materials 0.000 claims abstract description 85
- 239000000843 powder Substances 0.000 claims abstract description 78
- 239000012298 atmosphere Substances 0.000 claims abstract description 22
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 19
- 230000005294 ferromagnetic effect Effects 0.000 claims description 14
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000003570 air Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000009692 water atomization Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 10
- 230000032683 aging Effects 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 5
- RIVZIMVWRDTIOQ-UHFFFAOYSA-N cobalt iron Chemical compound [Fe].[Co].[Co].[Co] RIVZIMVWRDTIOQ-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 26
- 229920002050 silicone resin Polymers 0.000 description 11
- 239000000956 alloy Substances 0.000 description 8
- 239000012300 argon atmosphere Substances 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 229910005347 FeSi Inorganic materials 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 239000002923 metal particle Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229910002546 FeCo Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- YCANCZRRZBHLEN-UHFFFAOYSA-N [N].O Chemical compound [N].O YCANCZRRZBHLEN-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- CMBZEFASPGWDEN-UHFFFAOYSA-N argon;hydrate Chemical compound O.[Ar] CMBZEFASPGWDEN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/08—Cores, Yokes, or armatures made from powder
-
- 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
- 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
Abstract
The invention discloses a ferro-cobalt magnetic core, a preparation method and application thereof. The preparation method of the iron-cobalt magnetic core comprises the following steps: 1) Preparing Fe-Co-Si-Al powder; 2) Preparing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer; 3) Preparing Fe-Co-Si-Al powder containing an Al layer; 4) Mixing Fe-Co-Si-Al powder containing an Al layer with silicon resin, pressing to form, and annealing in a protective atmosphere to obtain the iron-cobalt magnetic core. The iron-cobalt magnetic core has the advantages of high bending strength, small change of magnetic conductivity under high frequency, small change rate of inductance under high saturation magnetic field strength, no aging risk and the like, is simple in preparation process and low in production cost, can be used for a photovoltaic inverter, and is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of alloy magnetic cores, in particular to a ferro-cobalt magnetic core, a preparation method and application thereof.
Background
A photovoltaic power generation system (photovoltaic generation system, simply referred to as photovoltaic) is a power generation system that directly converts solar radiation energy into electric energy by utilizing the photovoltaic effect of photovoltaic cells. The photovoltaic inverter is an important component of the photovoltaic power generation system, and can convert variable direct current voltage generated by the photovoltaic solar panel into alternating current with the mains frequency, and the efficiency and the reliability of the photovoltaic inverter directly influence the performance of the whole photovoltaic power generation system. Currently, a large number of photovoltaic inverters use magnetic cores made of FeSi-based alloy materials having saturation magnetization of typically 150Am 2 About/kg, the inductance reduction rate corresponding to the saturation of the FeSi-based alloy material at the magnetic field strength of 100Oe is about 25%, and along with the increase of the installed amount, the FeSi-based alloy material cannot meet the practical application requirements. The saturation magnetization of FeCo-based alloy material is generally 190Am 2 Higher than/kg, corresponding to the inductance of saturation under 100Oe magnetic field strengthThe drop rate is about 15%, and the performance is more excellent than that of FeSi-based alloy materials, but the frequency characteristics are poor, the application is generally limited to low-frequency application, the requirement of high-frequency application cannot be met, and the strength of the manufactured magnetic core is low. In addition, both the existing FeSi-based alloy material and FeCo-based alloy material need to improve the bonding strength of the powder through a resin impregnation treatment, and the introduction of an organic resin often causes the risk of aging of the manufactured magnetic core.
Therefore, the development of the ferromagnetic cobalt magnetic core with high bending strength, small change of magnetic permeability under high frequency, small change rate of inductance under high saturation magnetic field strength and no aging risk has very important significance.
The statements above merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Disclosure of Invention
The invention aims to provide a ferromagnetic cobalt magnetic core, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
the preparation method of the iron-cobalt magnetic core comprises the following steps:
1) Smelting Fe-Co-Si-Al material, and then carrying out ultrahigh-pressure water atomization to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, mixing the Fe-Co-Si-Al powder with high temperature resistant oxide powder with the particle size of 0.1-1 mu m, then placing the mixture in an atmosphere containing water vapor at 400-600 ℃ for treatment, and sieving the high temperature resistant oxide powder to obtain Fe-Co-Si-Al powder containing a Si-Al composite oxide layer;
3) Placing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer in a reducing atmosphere for annealing, and forming an Al layer on the surface of the Si-Al composite oxide layer to obtain Fe-Co-Si-Al powder containing the Al layer;
4) Mixing Fe-Co-Si-Al powder containing an Al layer with silicon resin, pressing to form, and annealing in a protective atmosphere to obtain the iron-cobalt magnetic core.
Preferably, the Fe-Co-Si-Al material in the step 1) comprises the following components in percentage by mass:
Fe：65.5％～75.5％；
Co：20％～27％；
Si：3％～5％；
Al：1.5％～2.5％。
preferably, the addition amount of the high-temperature-resistant oxide powder in the step 2) is 5-25% of the mass of the Fe-Co-Si-Al powder.
Preferably, the refractory oxide powder in the step 2) is at least one of a silicon oxide powder and an aluminum oxide powder. The high-temperature resistant oxide powder is distributed among the Fe-Co-Si-Al powder, so that the agglomeration of the Fe-Co-Si-Al powder caused by adhesion in the oxidation treatment process can be effectively prevented.
Preferably, the Fe-Co-Si-Al powder obtained in the step 2) has a particle size of 3-27 μm after air classification.
Preferably, the atmosphere containing water vapor of step 2) is composed of water vapor and at least one of air, nitrogen and argon.
Preferably, the volume percentage of the water vapor in the atmosphere containing water vapor in the step 2) is 70-90%.
Preferably, the treatment in step 2) takes 1 to 5 hours.
Preferably, the reducing atmosphere in step 3) is a hydrogen-containing atmosphere.
Preferably, the annealing in the step 3) is performed at 600-700 ℃ for 1-3 hours.
Preferably, the addition amount of the silicon resin in the step 4) is 1.5-2.5% of the mass of the Fe-Co-Si-Al powder of the Al-containing layer.
Preferably, the silicone resin in the step 4) is at least one of silicone resin KR-282 of Xinyue chemical industry Co., ltd, silicone resin KR-242A of Xinyue chemical industry Co., ltd, and silicone resin KR-271 of Xinyue chemical industry Co., ltd.
Preferably, the pressing in step 4) is carried out at a pressure of 16 tons/cm 2 About 20 tons/cm 2 。
Preferably, the protective atmosphere in step 4) is an argon atmosphere.
Preferably, the annealing in the step 4) is performed at 550-650 ℃ for 2-5 hours.
A ferromagnetic cobalt core made by the above method of preparation.
A photovoltaic inverter comprising the ferromagnetic core described above.
The beneficial effects of the invention are as follows: the iron-cobalt magnetic core has the advantages of high bending strength, small change of magnetic conductivity under high frequency, small change rate of inductance under high saturation magnetic field strength, no aging risk and the like, is simple in preparation process and low in production cost, can be used for a photovoltaic inverter, and is suitable for large-scale popularization and application.
Specifically: according to the invention, the material components and the process flow are improved and optimized, an alloy phase which is easier to oxidize Fe is formed, the saturation magnetization intensity of the prepared iron-cobalt magnetic core is higher, al and Si are gradually separated out by utilizing catalysis of high-temperature vapor, an Si-Al composite oxide layer is formed on the surface of metal particles, and then an Al layer is formed on the surface of the Si-Al composite oxide layer through reduction treatment, wherein the Si-Al composite oxide layer can improve the insulating property of the magnetic core material, so that eddy current loss among particles can be reduced, and an Al oxide film formed among metal particles in the compression molding process of the magnetic core material can be used for bonding metal particles, so that the prepared iron-cobalt magnetic core has no aging problem and can be applied to KHz level.
Detailed Description
The invention is further illustrated and described below in connection with specific examples.
Example 1:
a ferromagnetic cobalt core, the method of making comprising the steps of:
1) The Fe-Co-Si-Al material (composition: 75.5wt% of Fe, 20wt% of Co, 3wt% of Si and 1.5wt% of Al) are added into a high-frequency furnace for smelting, and then ultra-high pressure water atomization is carried out to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, mixing Fe-Co-Si-Al powder with the particle size of 3-27 mu m with silicon oxide powder with the particle size of 1 mu m according to the mass ratio of 1:0.25, then placing the mixture in an argon-water vapor mixed atmosphere (the volume ratio of argon to water vapor is 3:7) for treatment at 400 ℃ for 5 hours, and sieving the silicon oxide powder to obtain Fe-Co-Si-Al powder containing a Si-Al composite oxide layer;
3) Placing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer in a hydrogen atmosphere, and annealing at 700 ℃ for 1h to form an Al layer on the surface of the Si-Al composite oxide layer to obtain Fe-Co-Si-Al powder containing the Al layer;
4) Mixing Fe-Co-Si-Al powder containing Al layer with silicone resin (silicon resin KR-282 of Xinyue chemical Co., ltd.) at a mass ratio of 1:0.02, and pressing at 20 ton/cm 2 And (3) pressing and forming the material, and annealing the material for 2 hours at 650 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Example 2:
a ferromagnetic cobalt core, the method of making comprising the steps of:
1) The Fe-Co-Si-Al material (composition: 70.5wt% of Fe, 23wt% of Co, 4.5wt% of Si and 2wt% of Al) are added into a high-frequency furnace for smelting, and then ultra-high pressure water atomization is carried out to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, mixing Fe-Co-Si-Al powder with the particle size of 3-27 mu m with silicon oxide powder with the particle size of 0.3 mu m according to the mass ratio of 1:0.15, then placing the mixture in an air-water vapor mixed atmosphere (the volume ratio of air to water vapor is 2:8) for 3 hours at 500 ℃, and sieving the silicon oxide powder to obtain Fe-Co-Si-Al powder containing a Si-Al composite oxide layer;
3) Placing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer in a hydrogen atmosphere, and annealing at 650 ℃ for 2 hours to form an Al layer on the surface of the Si-Al composite oxide layer, thereby obtaining Fe-Co-Si-Al powder containing the Al layer;
4) Mixing Fe-Co-Si-Al powder containing Al layer with silicone resin (silicon resin KR-242A of Xinyue chemical Co., ltd.) at a mass ratio of 1:0.02, and pressing at 18 ton/cm 2 And (3) pressing and forming the material, and annealing the material for 3 hours at 600 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Example 3:
a ferromagnetic cobalt core, the method of making comprising the steps of:
1) The Fe-Co-Si-Al material (composition: 65.5wt% of Fe, 27wt% of Co, 5wt% of Si and 2.5wt% of Al) are added into a high-frequency furnace for smelting, and then ultra-high pressure water atomization is carried out to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, mixing Fe-Co-Si-Al powder with the particle size of 3-27 mu m with alumina powder with the particle size of 0.1 mu m according to the mass ratio of 1:0.05, then placing the mixture in a nitrogen-water vapor mixed atmosphere (the volume ratio of nitrogen to water vapor is 1:9) for treatment at 400 ℃ for 1h, and sieving the alumina powder to obtain Fe-Co-Si-Al powder containing a Si-Al composite oxide layer;
3) Placing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer in a hydrogen atmosphere at 600 ℃ for annealing for 3 hours, and forming an Al layer on the surface of the Si-Al composite oxide layer to obtain Fe-Co-Si-Al powder containing the Al layer;
4) Mixing Fe-Co-Si-Al powder containing Al layer with silicone resin (silicon resin KR-271 of Xinyue chemical Co., ltd.) at a mass ratio of 1:0.02, and pressing at 16 ton/cm 2 And (3) pressing and forming the material, and annealing the material for 5 hours at 550 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Comparative example 1:
a ferromagnetic cobalt core, the method of making comprising the steps of:
will D 50 Fe-Co gas atomized powder with particle size of 15 μm (composition: 96.5wt% Fe and 3.5wt% Co), silicone resin (silicone resin KR-282 of Xinyue chemical industry Co., ltd.), talcum powder and silane coupling agent KH550 were mixed and granulated according to a mass ratio of 1:0.02:0.02:0.003, and then mixed with epoxy resin (epoxy resin DER331 of Dow chemical) according to a mass ratio of 1:0.01, and then the mixture was subjected to granulation under a pressure of 20 tons/cm 2 And (3) pressing and forming the material, and annealing the material for 5 hours at 600 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Comparative example 2:
a ferromagnetic cobalt core, the method of making comprising the steps of:
1) The Fe-Co-Si-Al material (composition: 75.5wt% of Fe, 20wt% of Co, 3wt% of Si and 1.5wt% of Al) are added into a high-frequency furnace for smelting, and then ultra-high pressure water atomization is carried out to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, and then taking Fe-Co-Si-Al powder with the particle size of 3-27 mu m, and placing the Fe-Co-Si-Al powder in a hydrogen atmosphere for annealing at 700 ℃ for 1h to obtain Fe-Co-Si-Al powder subjected to reduction treatment;
3) Mixing the reduced Fe-Co-Si-Al powder with silicone resin (silicon resin KR-282 of Xinyue chemical Co., ltd.) at a mass ratio of 1:0.02, and pressing at 20 ton/cm 2 And (3) pressing and forming the material, and annealing the material for 2 hours at 650 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Comparative example 3:
a ferromagnetic cobalt core, the method of making comprising the steps of:
1) The Fe-Co-Si-Al material (composition: 75.5wt% of Fe, 20wt% of Co, 3wt% of Si and 1.5wt% of Al) are added into a high-frequency furnace for smelting, and then ultra-high pressure water atomization is carried out to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Placing Fe-Co-Si-Al powder in an argon-steam mixed atmosphere (the volume ratio of argon to steam is 3:7) for treatment at 400 ℃ for 5 hours, and then placing in a hydrogen atmosphere for annealing at 700 ℃ for 1 hour to obtain reduction-treated Fe-Co-Si-Al powder;
3) Mixing the reduced Fe-Co-Si-Al powder with silicone resin (silicon resin KR-282 of Xinyue chemical Co., ltd.) at a mass ratio of 1:0.02, and pressing at 20 ton/cm 2 And (3) pressing and forming the material, and annealing the material for 2 hours at 650 ℃ in an argon atmosphere to obtain the iron-cobalt magnetic core.
Performance test:
the results of the performance tests of the ferromagnetic cores of examples 1 to 3 and comparative examples 1 to 3 are shown in the following table:
TABLE 1 results of Performance test of the iron-cobalt cores of examples 1 to 3 and comparative examples 1 to 3
Note that:
flexural strength: the size specification of the test sample piece is 35mm multiplied by 4mm multiplied by 3mm, the test is carried out by adopting a universal tester, the test span is 30mm, and the displacement loading rate is 0.5mm/min.
Permeability and inductance decrease rate: the test sample piece is annular, the outer diameter is 20mm, the inner diameter is 12mm, the height is 2mm, the number of winding turns is N=13 Ts, and the effective magnetic permeability mu of the magnetic ring sample is tested by adopting a 3260B LCR tester e (test frequencies are 10KHz, 50KHz and 100KHz respectively), and the reduction rate of inductance is tested at an equivalent magnetic field strength of 100Oe for a DC field H relative to that of 0Oe for H.
As can be seen from table 1: compared with the iron-cobalt magnetic cores of comparative examples 1-3, the iron-cobalt magnetic cores of examples 1-3 have significantly smaller magnetic permeability change at high frequency, greatly improved bending strength and smaller inductance change rate at high saturation magnetic field strength, which shows that the invention finally obtains the iron-cobalt magnetic core with high bending strength, small magnetic permeability change at high frequency and small inductance change rate at high saturation magnetic field strength through the improvement and optimization of material components and process flow, and is suitable for a photovoltaic inverter.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. The preparation method of the iron-cobalt magnetic core is characterized by comprising the following steps of:
1) Smelting Fe-Co-Si-Al material, and then carrying out ultrahigh-pressure water atomization to obtain Fe-Co-Si-Al powder with the particle size of 3-50 mu m;
2) Carrying out air classification on Fe-Co-Si-Al powder, mixing the Fe-Co-Si-Al powder with high temperature resistant oxide powder with the particle size of 0.1-1 mu m, then placing the mixture in an atmosphere containing water vapor at 400-600 ℃ for treatment, and sieving the high temperature resistant oxide powder to obtain Fe-Co-Si-Al powder containing a Si-Al composite oxide layer;
3) Placing Fe-Co-Si-Al powder containing the Si-Al composite oxide layer in a reducing atmosphere for annealing, and forming an Al layer on the surface of the Si-Al composite oxide layer to obtain Fe-Co-Si-Al powder containing the Al layer;
4) Mixing Fe-Co-Si-Al powder containing an Al layer with silicon resin, pressing to form, and annealing in a protective atmosphere to obtain a ferromagnetic cobalt magnetic core;
the Fe-Co-Si-Al material in the step 1) comprises the following components in percentage by mass: fe:65.5 to 75.5 percent; co:20% -27%; si:3% -5%; al:1.5 to 2.5 percent;
the addition amount of the high-temperature-resistant oxide powder in the step 2) is 5-25% of the mass of the Fe-Co-Si-Al powder;
the high-temperature resistant oxide powder in the step 2) is at least one of silicon oxide powder and aluminum oxide powder;
the Fe-Co-Si-Al powder in the step 2) is subjected to air current classification, and the grain diameter is 3-27 mu m;
the treatment time of the step 2) is 1-5 h;
and 3) annealing at 600-700 ℃ for 1-3 h.
2. The method of manufacturing according to claim 1, characterized in that: the atmosphere containing water vapor in the step 2) is composed of at least one of air, nitrogen and argon and water vapor.
3. The method of manufacturing according to claim 1, characterized in that: the addition amount of the silicon resin in the step 4) is 1.5-2.5% of the mass of the Fe-Co-Si-Al powder of the Al-containing layer.
4. The method of manufacturing according to claim 1, characterized in that: step 4) the pressing pressure is 16 tons/cm 2 About 20 tons/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the And 4) annealing at 550-650 ℃ for 2-5 h.
5. A ferromagnetic cobalt core, characterized by being produced by the production method according to any one of claims 1 to 4.
6. A photovoltaic inverter comprising the ferromagnetic cobalt core of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310973767.1A CN116825468B (en) | 2023-08-04 | 2023-08-04 | Iron-cobalt magnetic core and preparation method and application thereof |
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| CN202310973767.1A CN116825468B (en) | 2023-08-04 | 2023-08-04 | Iron-cobalt magnetic core and preparation method and application thereof |
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| Publication Number | Publication Date |
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