CN114156034A - Low-loss iron-nickel magnetic powder core composite coating method - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Abstract
The invention belongs to the technical field of metal soft magnetic materials, and particularly relates to a low-loss iron-nickel magnetic powder core composite coating method. The composite coating method disclosed by the invention has the advantages that the coating is carried out in multiple times, the resistivity is high, the coating is uniform, the thermal stability is good, and the obtained iron-nickel magnetic powder core has the characteristics of low loss and high magnetic conductivity.
Description
Technical Field
The invention belongs to the technical field of metal soft magnetic materials, and particularly relates to a low-loss iron-nickel magnetic powder core composite coating method.
Background
The iron-nickel magnetic powder core is a metal powder magnetic core made of Fe and Ni alloy powder, can work under high power, high direct current bias or high frequency alternating current, and is mainly applied to switching regulation inductors, online noise filters, flyback transformers, power factor correction, pulse transformers and the like.
At present, a metal magnetic powder core is obtained by mainly uniformly mixing metal magnetic powder and an insulating material, coating a layer of uniform and compact insulating material on the surface of the magnetic powder, and then performing certain heat treatment after compression molding. However, the power loss of the magnetic powder core has an important relationship with the type and the addition amount of the insulating material to be coated and the coating method. With the development of high frequency electronic devices, it is an essential trend that the metal magnetic powder core has excellent properties such as high magnetic permeability and low loss. Therefore, how to obtain a low-loss magnetic powder core by improving the coating method is worth studying.
Disclosure of Invention
The invention aims to provide a low-loss iron-nickel magnetic powder core composite coating method, which comprises the steps of respectively carrying out surface treatment on iron and nickel, coating the iron and nickel with silicon dioxide, mixing the iron and the nickel in proportion, and coating the mixture with epoxy modified organic silicon resin, wherein the coating is uniform and good in thermal stability, and the obtained iron-nickel magnetic powder core has the characteristics of low magnetic loss and high magnetic conductivity.
In order to achieve the aim, the invention provides a low-loss iron-nickel magnetic powder core composite coating method, which comprises the following specific steps:
s1, respectively placing an iron ingot and a nickel ingot in a medium-frequency induction furnace for smelting, after impurity removal, crushing by using spray to prepare powder, and then respectively sieving according to the particle size of 150-300 meshes for later use;
s2, respectively weighing 50-55 parts by weight of iron powder and 45-50 parts by weight of nickel powder in S1, respectively carrying out surface treatment, then respectively putting into a stirrer to be mixed with 1-1.5 parts by weight of silicon dioxide, and stirring for 1-2h to obtain iron-coated powder and nickel-coated powder of which the surfaces are coated with silicon dioxide;
s3, uniformly mixing the iron-coated powder and the nickel-coated powder in the step S2, adding 3-4 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding the lubricant into the iron-nickel magnetic powder insulated and coated in the step S3, putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, and maintaining the pressure for 2-4S under the condition that the forming pressure is 18-24t/cm2 to prepare a blank magnetic powder core;
s5, carrying out heat treatment on the blank magnetic powder core formed in the step S4 for 2-3h under the protection of nitrogen at the temperature of 600-700 ℃ to obtain the iron-nickel magnetic powder core.
According to the technical scheme, iron powder and nickel powder are respectively mixed with high-heat-resistance silicon dioxide to form iron-coated powder and nickel-coated powder, the surfaces of which are coated with a thin layer, the fluidity of iron and nickel can be improved by adding silicon, the mixing is more uniform, meanwhile, the heat resistance and corrosion resistance can be improved, the resistivity can be improved, then the iron-coated powder and the nickel-coated powder are mixed, epoxy modified organic silicon resin is added to coat a layer of uniform insulating film on the surface of the iron-nickel magnetic powder, the resistivity is further improved, the magnetic loss is reduced, and the frequency stability is improved.
Further, in the technical scheme S1, after the impurity removal, the sulfur content in the iron is lower than 0.01%.
The sulfur content in the iron powder is too high, so that the magnetic conductivity and the saturation magnetic flux density of the iron powder are reduced, and the hysteresis loss and the coercive force are improved. In the technical scheme, the impurity removal method is utilized to reduce the content of the iron powder to be less than 0.01%, which is beneficial to improving the magnetic conductivity and reducing the magnetic loss.
Further, in the above technique S2, the particle size of the silica is less than 300 meshes, and the stirring speed is 300-500 r/min.
In the technical scheme, the particle size of the silicon dioxide is controlled to be smaller than that of the iron powder and the nickel powder, so that a silicon dioxide film is conveniently formed on the surfaces of the iron powder and the nickel powder, and the resistivity and the heat resistance are improved.
Further, in the above technical solution S2, the surface treatment method includes: respectively adding phosphorus pentoxide accounting for 0.03-0.04% of the weight of the iron powder or the nickel powder into the iron powder or the nickel powder, grinding for 1-2h, respectively adding hot water of which the weight is 10-50 times that of the phosphorus powder, and reacting for 0.5-1h to obtain the phosphorus-containing iron-nickel composite material. Specifically, the hot water is hot water with a temperature of 80-100 ℃. In the technical scheme, a small amount of phosphorus pentoxide and iron powder or nickel powder are added for mixing and grinding, so that the resistivity and strength of the powder can be improved, the eddy current loss is reduced, the grinding ball efficiency can be improved, after hot water is added, excessive phosphorus pentoxide can be added into water to form phosphoric acid, a passivation layer is formed on the surfaces of the iron powder and the nickel powder, and the magnetic loss is reduced.
Further, in the technical scheme S3, the epoxy modified silicone resin mixed solution is obtained by adding 20 to 40 parts by weight of mica powder, 20 to 50 parts by weight of silica powder and 0 to 50 parts by weight of titanium dioxide into 100 parts by weight of epoxy modified silicone resin, and grinding the mixture for 1 to 2 hours by using a grinder.
In the technical scheme, the mica powder has the characteristics of good elasticity, insulativity, high temperature resistance, strong adhesive force and the like, is used as an additive to be added into resin, and can improve the insulating property, the mechanical property and the high temperature resistance of the resin; the silicon micropowder is quartz powder with the average particle size of 0.1-0.3 mu m, has excellent electrical insulation and soakage, can eliminate the internal stress of resin, and improves the insulation and arc resistance of the resin; titanium dioxide as an inorganic filler can improve the heat resistance and mechanical strength of the resin, has good surface wettability and is easy to disperse.
Further, in the above technical scheme, the solid content of the epoxy modified silicone resin is 52-58%.
Further, in the technical scheme, the epoxy modified organic silicon resin is obtained by mixing E-20 epoxy resin and dimethyl diethoxy silane according to the weight ratio of 1: 0.3-0.5. Specifically, 1 part by weight of E-20 epoxy resin and 0.3-0.5 part by weight of dimethyl diethoxy silane are added into cyclohexanone or butyl acetate solvent and catalyst, heated in a stirrer for reaction for 2-3h, and then cooled to obtain the epoxy resin.
Further, in the above technical solution S4, the lubricant is one of zinc stearate or amide wax, and the usage amount accounts for 0.4 to 0.8% of the total amount of the insulation-coated iron-nickel magnetic powder.
The invention has the beneficial effects that:
1. the invention can improve the magnetic conductivity and reduce the magnetic loss by strictly controlling the content of sulfur in the raw materials;
2. according to the invention, through surface treatment, the phosphorus content in the raw material is increased, the resistivity and the strength can be improved, and the eddy current loss is reduced;
3. according to the invention, iron and nickel are respectively subjected to surface treatment and then coated with silicon dioxide, and then the iron and the nickel are mixed in proportion and then coated with the epoxy modified organic silicon resin solution, so that the resistivity and the heat resistance are improved, the coating is uniform, the thermal stability is good, and the obtained iron-nickel magnetic powder core has the characteristics of low loss and high magnetic conductivity.
Detailed Description
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials in the following examples are all commercially available products and are commercially available, unless otherwise specified.
The present invention is described in further detail below with reference to examples:
example 1
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the sulfur content in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 200 meshes for later use;
s2, weighing 50 parts by weight of iron powder in S1, adding 0.02 part by weight of phosphorus pentoxide, grinding for 1h, then adding 1 part by weight of 80 ℃ hot water, reacting for 1h, putting into a stirrer, mixing with 1 part by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 2h at the speed of 300r/min to obtain iron-coated powder with the surface coated with the silicon dioxide; weighing 50 parts by weight of nickel powder, adding 0.02 part by weight of phosphorus pentoxide, grinding for 1h, adding 1 time of hot water with the weight of phosphorus powder and the temperature of 80 ℃, reacting for 1h, putting the mixture into a stirrer, mixing with 1 part by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 2h at the speed of 300r/min to obtain nickel-coated powder with the surface coated with silicon dioxide;
s3, uniformly mixing the iron-coated powder and the nickel-coated powder in the step S2, adding 3 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding 0.5 weight part of zinc stearate into the iron-nickel magnetic powder coated in the S3 in an insulating way, and then putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, wherein the forming pressure is 18t/cm2Maintaining the pressure for 4s under the condition of (1) to prepare a blank magnetic powder core;
and S5, heating the blank magnetic powder core formed in the step S4 for 3 hours at the temperature of 600 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
Wherein the mixed solution of the epoxy modified organic silicon resin is obtained by adding 20 parts by weight of mica powder, 30 parts by weight of silica powder and 20 parts by weight of titanium dioxide into 100 parts by weight of the epoxy modified organic silicon resin and grinding the mixture for 1 hour by a grinder.
Example 2
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the content of sulfur in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 250 meshes for later use;
s2, weighing 52 parts by weight of iron powder in S1, adding 0.016 part by weight of phosphorus pentoxide, grinding for 1.5h, adding 0.8 part by weight of 90 ℃ hot water, reacting for 0.8h, putting into a stirrer, mixing with 1.2 parts by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 1.5h at the speed of 400r/min to obtain iron-coated powder with the surface coated with silicon dioxide; weighing 48 parts by weight of nickel powder, adding 0.015 part by weight of phosphorus pentoxide into the nickel powder, grinding for 1.5h, adding 0.75 part by weight of 90 ℃ hot water, reacting for 0.8h, putting the mixture into a stirrer, mixing with 1.2 parts by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 1.5h at the speed of 400r/min to obtain nickel-coated powder with the surface coated with silicon dioxide;
s3, uniformly mixing the iron-coated powder and the nickel-coated powder in the step S2, adding 3.5 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding 0.6 weight part of amide wax into the iron-nickel magnetic powder coated in the S3 in an insulating way, and then putting the mixture into an automatic dry powder forming hydraulic press, wherein the forming pressure is 20t/cm2Maintaining the pressure for 3s under the condition of (1) to prepare a blank magnetic powder core;
and S5, carrying out heat treatment on the blank magnetic powder core formed in the step S4 for 2.5 hours at the temperature of 650 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
Wherein the mixed solution of the epoxy modified organic silicon resin is obtained by adding 30 parts by weight of mica powder, 30 parts by weight of silica powder and 20 parts by weight of titanium dioxide into 100 parts by weight of the epoxy modified organic silicon resin and grinding the mixture for 1.5 hours by using a grinder.
Example 3
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the content of sulfur in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 300 meshes for later use;
s2, weighing 55 parts by weight of iron powder in S1, adding 0.02 part by weight of phosphorus pentoxide, grinding for 2 hours, then adding 1 part by weight of 100 ℃ hot water, reacting for 0.5 hour, putting into a stirrer, mixing with 1.5 parts by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 1 hour at the speed of 500r/min to obtain iron-coated powder with the surface coated with the silicon dioxide; weighing 45 parts by weight of nickel powder, adding 0.018 part by weight of phosphorus pentoxide into the nickel powder, grinding the mixture for 2 hours, adding 0.9 part by weight of hot water with the temperature of 100 ℃, reacting the mixture for 0.5 hour, putting the mixture into a stirrer, mixing the mixture with 1.5 parts by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring the mixture for 1 hour at the speed of 500r/min to obtain nickel-coated powder with the surface coated with the silicon dioxide;
s3, uniformly mixing the iron-coated powder and the nickel-coated powder in the step S2, adding 4 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding 0.8 weight part of zinc stearate into the iron-nickel magnetic powder coated in the S3 in an insulating way, and then putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, wherein the forming pressure is 24t/cm2Maintaining the pressure for 2s under the condition of (1) to prepare a blank magnetic powder core;
and S5, carrying out heat treatment on the blank magnetic powder core formed in the step S4 for 2h at the temperature of 700 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
Wherein the mixed solution of the epoxy modified organic silicon resin is obtained by adding 40 parts by weight of mica powder, 20 parts by weight of silica powder and 10 parts by weight of titanium dioxide into 100 parts by weight of the epoxy modified organic silicon resin and grinding the mixture for 1 to 2 hours by using a grinder.
Comparative example 1
The specific steps of the low-loss iron-nickel magnetic powder core composite coating method are the same as those of example 1, except that the sulfur content in iron is higher than 0.04%.
Comparative example 2
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the sulfur content in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 200 meshes for later use;
s2, weighing 50 parts by weight of iron powder and 50 parts by weight of nickel powder in the step S1, uniformly mixing, then adding 3 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s3, adding 0.5 part by weight of zinc stearate into the iron-nickel magnetic powder coated in the S2 in an insulating way, and then putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, wherein the forming pressure is 18t/cm2Maintaining the pressure for 4s under the condition of (1) to prepare a blank magnetic powder core;
and S4, heating the blank magnetic powder core formed in the step S3 for 3 hours at the temperature of 600 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
Wherein the mixed solution of the epoxy modified organic silicon resin is obtained by adding 20 parts by weight of mica powder, 30 parts by weight of silica powder and 20 parts by weight of titanium dioxide into 100 parts by weight of the epoxy modified organic silicon resin and grinding the mixture for 1 hour by a grinder.
Comparative example 3
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the sulfur content in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 200 meshes for later use;
s2, weighing 50 parts by weight of iron powder and 50 parts by weight of nickel powder in S1, uniformly mixing, adding 0.04 part by weight of phosphorus pentoxide, grinding for 1h, adding 1 time of hot water with the weight of phosphorus powder and the temperature of 80 ℃, reacting for 1h, putting into a stirrer, mixing with 2 parts by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 2h at the speed of 300r/min to obtain iron-nickel coated powder with the surface coated with the silicon dioxide;
s3, adding the iron-nickel coated powder in the step S2 into 3 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding 0.5 weight part of zinc stearate into the iron-nickel magnetic powder coated in the S3 in an insulating way, and then putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, wherein the forming pressure is 18t/cm2Maintaining the pressure for 4s under the condition of (1) to prepare a blank magnetic powder core;
and S5, carrying out heat treatment on the blank magnetic powder core formed in the step S4 for 3 hours at the temperature of 600 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
Comparative example 4
A low-loss iron-nickel magnetic powder core composite coating method comprises the following specific steps:
s1, respectively putting an iron ingot and a nickel ingot into a medium-frequency induction furnace for smelting, after impurity removal, enabling the sulfur content in iron to be lower than 0.01%, crushing into powder by using spray, and then respectively sieving according to the particle size of 200 meshes for later use;
s2, weighing 50 parts by weight of iron powder in S1, adding 0.02 part by weight of phosphorus pentoxide, grinding for 1h, then adding 1 part by weight of 80 ℃ hot water, reacting for 1h, putting into a stirrer, mixing with 1 part by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 2h at the speed of 300r/min to obtain iron-coated powder with the surface coated with the silicon dioxide; weighing 50 parts by weight of nickel powder, adding 0.02 part by weight of phosphorus pentoxide, grinding for 1h, adding 1 time of hot water with the weight of phosphorus powder and the temperature of 80 ℃, reacting for 1h, putting the mixture into a stirrer, mixing with 1 part by weight of silicon dioxide with the particle size of less than 300 meshes, and stirring for 2h at the speed of 300r/min to obtain nickel-coated powder with the surface coated with silicon dioxide;
s3, uniformly mixing the iron coating powder and the nickel coating powder in the step S2, drying, adding 0.5 part by weight of zinc stearate, putting into an automatic dry powder forming hydraulic press, and forming under the pressure of 18t/cm2Maintaining the pressure for 4s under the condition of (1) to prepare a blank magnetic powder core;
and S4, heating the blank magnetic powder core formed in the step S3 for 3 hours at the temperature of 600 ℃ under the protection of nitrogen to obtain the iron-nickel magnetic powder core.
And (3) performance testing:
the specific detection method comprises the following steps: the performance of the iron-nickel magnetic powder cores prepared in examples 1 to 3 and comparative examples 1 to 4 was measured using an IWATSUB-H analyzer (SY-8219) in accordance with standard SJ20966-2006, and the results are shown in Table 1.
TABLE 1 test results table
As can be seen from the test results in Table 1, the iron-nickel magnetic powder core prepared by the coating method of the embodiments 1-3 of the invention has high magnetic permeability, low loss and excellent comprehensive performance.
It can be seen from the results of comparative example 1 and comparative example 1 that when the sulfur content of the iron powder in comparative example 1 is too high, the saturation magnetic flux density and permeability are inferior to those in example 1, and the hysteresis loss is also larger.
The results of comparative example 1 and comparative example 2 show that the overall performance is poorer than that of example 1 when no silica pre-coating is used.
Comparing the results of example 1 and comparative example 3, it can be seen that although the silica coating is used in comparative example 3, the performance of the iron-nickel magnetic powder core obtained by mixing the iron and nickel powders is better than that of the iron-nickel magnetic powder core obtained by mixing the iron and nickel powders and coating the iron and nickel powders separately, although the performance is better than that of the iron-nickel magnetic powder core obtained by mixing the iron and nickel powders without using the silica coating.
As can be seen by comparing the results of example 1 and comparative example 4, when the coating was not performed using the epoxy-modified silicone resin, the neutralization performance was significantly inferior to that of example 1.
In conclusion, the invention uses the low-sulfur-content iron-nickel raw material, respectively coats the iron-nickel raw material with silicon dioxide, then mixes the raw material and the silicon dioxide in proportion, and coats the raw material with the epoxy modified organic silicon resin, so that the resistivity and the heat resistance are improved, the coating is uniform, the thermal stability is good, and the obtained iron-nickel magnetic powder core has the characteristics of low loss and high magnetic conductivity.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (8)
1. A low-loss iron-nickel magnetic powder core composite coating method is characterized by comprising the following specific steps:
s1, respectively placing an iron ingot and a nickel ingot in a medium-frequency induction furnace for smelting, after impurity removal, crushing by using spray to prepare powder, and then respectively sieving according to the particle size of 150-300 meshes for later use;
s2, respectively weighing 50-55 parts by weight of iron powder and 45-50 parts by weight of nickel powder in S1, respectively carrying out surface treatment, then respectively putting into a stirrer to be mixed with 1-1.5 parts by weight of silicon dioxide, and stirring for 1-2h to obtain iron-coated powder and nickel-coated powder of which the surfaces are coated with silicon dioxide;
s3, uniformly mixing the iron-coated powder and the nickel-coated powder in the step S2, adding 3-4 parts by weight of epoxy modified organic silicon resin mixed solution, uniformly stirring, and drying to obtain insulated coated iron-nickel magnetic powder;
s4, adding the lubricant into the iron-nickel magnetic powder insulated and coated in the step S3, and then putting the iron-nickel magnetic powder into an automatic dry powder forming hydraulic press, wherein the forming pressure is 18-24t/cm2Maintaining the pressure for 2-4s under the condition of (1) to prepare a blank magnetic powder core;
s5, carrying out heat treatment on the blank magnetic powder core formed in the step S4 for 2-3h under the protection of nitrogen at the temperature of 600-700 ℃ to obtain the iron-nickel magnetic powder core.
2. The low-loss iron-nickel magnetic powder core composite coating method according to claim 1, wherein in S1, after impurity removal, the sulfur content in iron is lower than 0.01%.
3. The method as claimed in claim 1, wherein in S2, the silica has a particle size of less than 300 meshes and a stirring speed of 300-500 r/min.
4. The low-loss iron-nickel magnetic powder core composite coating method according to claim 1, wherein in S2, the surface treatment method comprises the following steps: respectively adding phosphorus pentoxide accounting for 0.03-0.04% of the weight of the iron powder or the nickel powder into the iron powder or the nickel powder, grinding for 1-2h, respectively adding hot water of which the weight is 10-50 times that of the phosphorus powder, and reacting for 0.5-1h to obtain the phosphorus-containing iron-nickel composite material.
5. The low-loss iron-nickel magnetic powder core composite coating method according to claim 1, wherein in S3, the mixed solution of epoxy modified silicone resin is obtained by adding 20-40 parts by weight of mica powder, 20-50 parts by weight of silica powder and 0-50 parts by weight of titanium dioxide into 100 parts by weight of epoxy modified silicone resin, and grinding the mixture for 1-2 hours by using a grinder.
6. The low-loss iron-nickel magnetic powder core composite coating method according to claim 5, wherein the solid content of the epoxy modified silicone resin is 52-58%.
7. The low-loss iron-nickel magnetic powder core composite coating method according to claim 5, wherein the epoxy modified silicone resin is obtained by mixing E-20 epoxy resin and dimethyl diethoxysilane in a weight ratio of 1: 0.3-0.5.
8. The method of claim 1, wherein in step S4, the lubricant is one of zinc stearate or amide wax, and is used in an amount of 0.4-0.8% of the total amount of the insulation coated iron-nickel magnetic powder.
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