CN115910514A - Preparation method of amorphous nanocrystalline magnetic core with stable performance - Google Patents
Preparation method of amorphous nanocrystalline magnetic core with stable performance Download PDFInfo
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Abstract
The invention provides a preparation method of an amorphous nanocrystalline magnetic core with stable performance, which relates to the technical field of magnetic core preparation and comprises the following steps: winding the amorphous nanocrystalline strip into a magnetic core; placing the magnetic core in a heat treatment furnace for heat treatment, and cooling to room temperature to obtain a heat-treated magnetic core; preheating the magnetic core after heat treatment; soaking the preheated magnetic core in pre-prepared and heat-insulating glue paint, and then baking and curing to obtain an amorphous nanocrystalline magnetic core with stable performance; the manner of preparing the glue paint comprises the following steps: mixing the resin, the ester compound and the organic solvent to prepare the glue paint, and then carrying out heat preservation on the glue paint. The preparation method has the beneficial effects that the prepared magnetic core has excellent high-frequency performance, the inductance attenuation of the magnetic core is reduced, and the attenuation rate is lower than 5%, so that the inductance prepared by the amorphous nanocrystalline magnetic core with stable performance has excellent direct current bias resistance, the application range of the magnetic core is expanded, the stability of the magnetic core in working is ensured, and the design and the function realization of a magnetic device are facilitated.
Description
Technical Field
The invention relates to the technical field of magnetic core preparation, in particular to a preparation method of an amorphous nanocrystalline magnetic core with stable performance.
Background
With the increasing popularity of electronic devices and the progress toward high-frequency miniaturization, weight reduction, and integration, the application field of magnetic cores has been expanding as an important support member in the electronic information industry. However, the expansion of various new fields has put higher performance requirements on magnetic elements such as magnetic cores. The performance of electronic equipment is closely related to components such as magnetic cores used in the electronic equipment, and more and higher requirements are put forward on soft magnetic materials in order to realize high efficiency and miniaturization of power electronic devices. At present, power electronic devices inevitably have direct current components caused by leakage current and capacitive coupling in electronic circuits, and therefore, EMI common mode inductors in the circuits need to be designed to have certain anti-saturation capability and anti-DC-bias (anti-DC bias) characteristics, which also puts higher requirements on magnetic core performance.
Although the existing nanocrystalline magnetic core has good high magnetic conductivity and low loss, the anti-saturation capacity and the anti-direct current bias current characteristic are insufficient, the nanocrystalline magnetic core is quickly saturated in a circuit with a direct current component, the EMI filtering effect is poor, and the development and application of the magnetic core are hindered; in addition, even though the magnetic core prepared by the traditional magnetic core preparation method can meet the magnetic performance, once the winding and the boxing form the common-mode inductor, the inductance attenuation of the magnetic core is serious, and the design and the function realization of a magnetic device are not facilitated.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of an amorphous nanocrystalline magnetic core with stable performance, which comprises the following steps:
step S1, winding: winding the amorphous nanocrystalline strip into a magnetic core;
step S2, heat treatment: placing the magnetic core in a heat treatment furnace for heat treatment, and cooling to room temperature to obtain a heat-treated magnetic core;
step S3, pretreatment: preheating the magnetic core after heat treatment;
step S4, dip coating and curing: soaking the preheated magnetic core in pre-prepared and heat-insulating glue paint for vacuum impregnation and then baking and curing to obtain an amorphous nanocrystalline magnetic core with stable performance;
the manner of preparing the lacquer includes:
mixing resin, an ester compound and an organic solvent to prepare a glue paint, and then carrying out heat preservation on the glue paint.
Preferably, the step S2 includes:
s21, placing the magnetic core in the heat treatment furnace, raising the heat treatment temperature of the heat treatment furnace from room temperature to a first temperature rise temperature within a first temperature rise time, and then preserving heat for a first heat preservation time;
step S22, raising the temperature of the heat treatment from the first temperature rise temperature to a second temperature rise temperature within a second temperature rise time, and then keeping the temperature for a second heat preservation time;
step S23, raising the temperature of the heat treatment from the second temperature rise temperature to a third temperature rise temperature within a third temperature rise time, and then keeping the temperature for a third heat preservation time;
s24, cooling the heat treatment temperature from the third temperature rise temperature to the first temperature drop temperature within first temperature drop time, then preserving heat for fourth heat preservation time, and applying a transverse magnetic field within the fourth heat preservation time;
and S25, cooling the heat treatment temperature from the first cooling temperature to a second cooling temperature, and then discharging from the furnace and cooling to room temperature.
Preferably, the first temperature rise time is 50min to 120min, the first temperature rise temperature is 300 ℃ to 370 ℃, and the first heat preservation time is 20min to 60min;
the second temperature rise time is 30min-80min, the second temperature rise temperature is 370 ℃ to 490 ℃, and the second heat preservation time is 60min-120min;
the third temperature rise time is 60min to 100min, the third temperature rise temperature is 520 ℃ to 580 ℃, and the third heat preservation time is 100min to 150min;
the first cooling time is 30-60 min, the first cooling temperature is 500-530 ℃, the fourth heat preservation time is 100-300 min, and the current of the transverse magnetic field is 50-65A;
the second cooling temperature is below 120 ℃.
Preferably, in the step S3, the pre-treatment is to preheat the magnetic core after the heat treatment at a temperature of 75-85 ℃ for 30-50 min.
Preferably, in the mode of preparing the glue paint, the glue paint is prepared according to the mixing proportion of 10-20% of the resin, 40-60% of the ester compound and the balance of the organic solvent, and then the glue paint is placed at 71-80 ℃ for heat preservation for 20-40 min.
Preferably, the resin is at least one of epoxy resin, polyurethane, silicone resin, polyimide, cyanate ester, and acrylic resin.
Preferably, the ester compound is at least one of propylene glycol monoether acetate, polyacrylate and aromatic isocyanate.
Preferably, the organic solvent is one of ethanol, diethyl ether, ethyl acetate, acetone, xylene, toluene and cyclohexane.
Preferably, in the step S4, the impregnation time in the vacuum impregnation is 10S to 30S.
Preferably, in the step S4, the baking and curing temperature is 120 ℃ to 180 ℃, and the baking time is 1h to 2h.
The technical scheme has the following advantages or beneficial effects:
1) The amorphous nanocrystalline magnetic core prepared by the technical scheme has excellent high-frequency performance, the inductance attenuation of the magnetic core is reduced, and the attenuation rate is lower than 5%, so that the inductance prepared by the amorphous nanocrystalline magnetic core has excellent direct current bias resistance, the application range of the magnetic core is expanded, the stability of the magnetic core in work is ensured, and the design and the function realization of a magnetic device are facilitated;
2) The preparation method has the advantages of simple process, convenient operation, stable performance and good consistency of the prepared amorphous nanocrystalline magnetic core, low cost and mass production.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing a stable amorphous nanocrystalline magnetic core according to a preferred embodiment of the present invention;
FIG. 2 is a sub-flowchart of step S2 according to a preferred embodiment of the present invention;
fig. 3 is a graph comparing dc bias capability of magnetic cores prepared in each example and comparative example.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems in the prior art, a method for preparing an amorphous nanocrystalline magnetic core with stable performance is provided, as shown in fig. 1, including:
step S1, winding: winding the amorphous nanocrystalline strip into a magnetic core;
step S2, heat treatment: placing the magnetic core in a heat treatment furnace for heat treatment, and cooling to room temperature to obtain a heat-treated magnetic core;
step S3, preprocessing: preheating the magnetic core after heat treatment;
step S4, dip coating and curing: soaking the preheated magnetic core in pre-prepared and heat-insulating glue paint, and then baking and curing to obtain an amorphous nanocrystalline magnetic core with stable performance;
the manner of preparing the glue paint comprises the following steps:
mixing the resin, the ester compound and the organic solvent to prepare the glue paint, and then carrying out heat preservation on the glue paint.
Specifically, in this embodiment, an amorphous nanocrystalline strip is wound into a magnetic core by using a winding machine, and then the magnetic core is subjected to a heat treatment, where the heat treatment preferably includes three temperature raising stages, each temperature raising stage is performed with one corresponding heat preservation stage, and after the third heat preservation stage is completed, one temperature reduction stage is performed, and then one heat preservation stage is performed, after the heat preservation is completed, after the one temperature reduction stage is performed, the amorphous nanocrystalline strip is taken out of a furnace and is subjected to air cooling to room temperature, so that the magnetic core after the heat treatment can be prepared, further, a transverse magnetic field is synchronously applied in the heat preservation stage after the first temperature reduction stage, specifically, as shown in fig. 2, step S2 includes:
s21, placing the magnetic core in a heat treatment furnace, raising the heat treatment temperature of the heat treatment furnace from room temperature to a first temperature rise temperature within a first temperature rise time, and then preserving heat for a first heat preservation time;
step S22, raising the temperature of the heat treatment from the first temperature rise temperature to a second temperature rise temperature within a second temperature rise time, and then keeping the temperature for a second heat preservation time;
step S23, raising the temperature of the heat treatment from the second temperature rise temperature to a third temperature rise temperature within a third temperature rise time, and then keeping the temperature for a third heat preservation time;
step S24, cooling the heat treatment temperature from the third temperature rise temperature to the first temperature drop temperature within the first temperature drop time, then preserving heat for a fourth heat preservation time, and applying a transverse magnetic field within the fourth heat preservation time;
and S25, cooling the heat treatment temperature from the first cooling temperature to a second cooling temperature, and then discharging from the furnace to cool to room temperature.
In the preferred embodiment of the invention, the first temperature rise time is 50min-120min, the first temperature rise temperature is 300 ℃ -370 ℃, and the first heat preservation time is 20min-60min;
the second temperature rise time is 30min-80min, the second temperature rise temperature is 370 ℃ to 490 ℃, and the second heat preservation time is 60min-120min;
the third temperature rise time is 60min-100min, the third temperature rise temperature is 520 ℃ to 580 ℃, and the third heat preservation time is 100min-150min;
the first temperature reduction time is 30-60 min, the first temperature reduction temperature is 500-530 ℃, the fourth temperature preservation time is 100-300 min, and the current of the transverse magnetic field is 50-65A;
the second cooling temperature is below 120 ℃.
After the heat treatment is finished to obtain the heat-treated magnetic core, in order to ensure the impregnation effect, the method also comprises the step S3 of preheating the heat-treated magnetic core for 30-50 min at the temperature of 75-85 ℃. The glue paint obtained by preparation is insulated, so that the glue paint is high in activity and low in viscosity, and when the preheated magnetic core is placed in the insulated glue paint for vacuum impregnation, the glue paint can enter the magnetic core through the gravity of the glue paint, the surface of the magnetic core is clean and tidy, and subsequent magnetic core cutting is facilitated. The baking and curing are carried out after the vacuum impregnation, so that the glue paint can quickly form a sealing film on the surface of the magnetic core under the high-temperature condition, the glue paint is ensured to be remained in the magnetic core, the problems of paint leakage, low strength and the like in the conventional mode are solved, meanwhile, the high strength and low stress of the glue paint play a role in protecting the direct current bias resistance of the magnetic core, and the inductance attenuation rate is reduced from 12.23% to 4.09% by testing under the condition of applying 1.5A direct current when the finally prepared magnetic core is at 100kHz/0.3V, so that the inductance attenuation rate is reduced and the direct current bias resistance is strong.
In the preferred embodiment of the invention, in the mode of preparing the glue paint, the glue paint is prepared according to the mixing proportion of 10-20 percent of the mass ratio of the resin, 40-60 percent of the mass ratio of the ester compound and the balance of the organic solvent, and then the glue paint is placed at 71-80 ℃ for heat preservation for 20-40 min.
In a preferred embodiment of the present invention, the resin is at least one of epoxy resin, polyurethane, silicone resin, polyimide, cyanate ester, and acrylic resin.
In a preferred embodiment of the present invention, the ester compound is at least one of propylene glycol monoether acetate, polyacrylate, and aromatic isocyanate.
In a preferred embodiment of the present invention, the organic solvent is one of ethanol, diethyl ether, ethyl acetate, acetone, xylene, toluene, and cyclohexane.
In a preferred embodiment of the present invention, in step S4, the impregnation time of the vacuum impregnation is 10S to 30S.
In a preferred embodiment of the present invention, in step S4, the baking and curing temperature is 120 ℃ to 180 ℃, and the baking time is 1h to 2h.
Example 1
Selecting a Fe-Si-B-Nb-Cu iron-based nanocrystalline magnetically soft alloy strip with the average strip thickness of 20 +/-2 microns, preparing the amorphous nanocrystalline magnetic core with stable performance by adopting the preparation method disclosed by the invention, and completely preparing a circular iron core for testing the performance conveniently in the embodiment, wherein the specific steps are as follows:
winding: winding the nanocrystalline strip into a plurality of magnetic cores with the specification of 50 × 35 × 20mm by an automatic winding machine according to the size requirement of the magnetic cores;
and (3) heat treatment: placing the magnetic core in a magnetic field heat treatment furnace, heating to 350 deg.C for the first time, maintaining the temperature for 30min, heating to 400 deg.C for 50min, and maintaining the temperature for 100min; finally, heating to 80-550 ℃, preserving heat for 120min, then cooling, cooling to 40-520 ℃, preserving heat for 200min, applying a transverse magnetic field with current of 55A in the heat preservation stage, cooling to below 120 ℃ after the heat preservation stage is finished, and cooling to room temperature;
pretreatment: preheating the magnetic core after heat treatment for 40min at 75 ℃;
preparing glue paint: the resin is epoxy resin, the ester compound is propylene glycol monoether acetate, the organic solvent is acetone, and the epoxy resin, the propylene glycol monoether acetate and the acetone are mixed and stirred according to the mass ratio of 3;
paint dipping and curing: preheating the prepared glue lacquer in vacuum lacquer dipping equipment at 75 ℃ for 30min, then dipping the preheated magnetic core in the glue lacquer, carrying out vacuum impregnation for 20s, taking out the magnetic core, and then baking the magnetic core in a 150 ℃ baking oven for 90min to obtain the cured nanocrystalline magnetic core.
Selecting 10 magnetic cores prepared in the above example 1, and performing a performance test on the selected magnetic cores, wherein the test method comprises the following steps: winding a single-turn enameled copper wire on each magnetic core, and testing that the average value of the single-turn inductance is 26.9 muH under the condition of 100kHz/0.3V and the average value of the single-turn inductance under the DC bias of 100kHz/0.3V/1.5A is 25.8 muH by using an impedance analyzer; the inductance attenuation rate was 4.09%.
Example 2
Selecting a Fe-Si-B-Nb-Cu iron-based nanocrystalline magnetically soft alloy strip with the average strip thickness of 20 +/-2 microns, selecting epoxy resin as resin, selecting propylene glycol monoether acetate as an ester compound, selecting acetone as an organic solvent, and mixing and stirring the epoxy resin, the propylene glycol monoether acetate and the acetone according to a mass ratio of 1.
The magnetic cores prepared by the preparation method in example 2 were subjected to performance tests by the same test methods as in example 1, and the specific test results are shown in table 1.
Comparative example 1
The same soft magnetic alloy strip as in example 1, i.e. a Fe-Si-B-Nb-Cu iron-based nanocrystalline soft magnetic alloy strip with an average strip thickness of 20 +/-2 μm, was selected. In order to test the performance conveniently, the comparative example is prepared into a circular iron core, and the specific steps are as follows:
winding: winding the nanocrystalline strip into a plurality of magnetic cores with the specification of 50-35-20mm by an automatic winding machine according to the size requirement of the magnetic cores;
and (3) heat treatment: and (3) placing the magnetic ring in a heat treatment furnace for heat treatment, preserving the heat at 550 ℃ for 120min, and then cooling to room temperature to obtain the target magnetic core.
In the comparative example, 10 magnetic cores in the comparative example 1 are selected, and performance test is performed on the selected magnetic cores, wherein the test method comprises the following steps: winding a single-turn enameled copper wire on each magnetic core, and testing that the average value of the single-turn inductance is 27.8 muH under the condition of 100kHz/0.3V and the average value of the inductance under the DC bias of 100kHz/0.3V/1.5A is 24.4 muH by using an impedance analyzer; the inductance attenuation rate was 12.23%.
Comparative example 2
In this comparative example, the same soft magnetic alloy strip as in example 1 was selected, and the average thickness of the strip was 20 ± 2 μm. In order to test the performance conveniently, the comparative example is prepared into a circular iron core, and the specific steps are as follows:
winding: winding the nanocrystalline strip into a plurality of magnetic cores with the specification of 50-35-20mm by an automatic winding machine according to the size requirement of the magnetic cores;
and (3) heat treatment: and (3) placing the magnetic ring in a heat treatment furnace for heat treatment, preserving the heat at 550 ℃ for 120min, and then cooling to room temperature to obtain the target magnetic core.
Pretreatment: preheating the magnetic core after heat treatment for 40min at 75 ℃;
preparing a rubber paint: the resin is epoxy resin, the ester compound is propylene glycol monoether acetate, the organic solvent is acetone, and the epoxy resin, the propylene glycol monoether acetate and the acetone are mixed and stirred according to the mass ratio of 3.
Paint dipping and curing: preheating the prepared glue paint in vacuum paint dipping equipment at 75 ℃ for 30min, dipping the preheated magnetic core in the glue paint, carrying out vacuum impregnation for 20s, taking out, and baking in a 150 ℃ oven for 90min to obtain the cured nanocrystalline magnetic core.
The magnetic cores prepared by the preparation method of comparative example 2 were subjected to performance tests using the same test methods as in example 1, and the specific test results are shown in table 1.
Comparative example 3
In the comparative example, a Fe-Si-B-Nb-Cu iron-based nanocrystalline magnetically soft alloy strip with the average strip thickness of 20 +/-2 microns is selected, epoxy resin is selected as the resin, acetone is selected as the organic solvent, and the epoxy resin and the acetone are mixed and stirred according to the mass ratio of 1.
The magnetic cores prepared by the preparation method in comparative example 3 were subjected to performance tests using the same test method as in example 1, and the specific test results are shown in table 1.
TABLE 1 magnetic Property parameters before and after curing of magnetic cores of examples 1-2 and comparative examples 1-3
| AL(100kHz/0.3V) | AL(100kHz/0.3V/1.5A) | Rate of inductance decay | |
| Examples1 | 26.9 | 25.8 | 4.09％ |
| Example 2 | 26.7 | 25.4 | 4.87％ |
| Comparative example 1 | 27.8 | 24.4 | 12.23％ |
| Comparative example 2 | 27.5 | 24.3 | 11.63％ |
| Comparative example 3 | 24.1 | 15.6 | 35.26％ |
It can be seen that, the preparation methods of the present invention are adopted to prepare the magnetic cores in the embodiments 1 and 2, and the differences are only that the proportions of the resin, the ester compound and the organic solvent in the glue varnish are different, and the dc-resistant magnetic cores prepared in the two embodiments have excellent high-frequency performance, the inductance attenuation of the magnetic cores is reduced, and the attenuation rate is lower than 5%, so that the inductor prepared by adopting the amorphous nanocrystalline magnetic core has excellent dc bias resistance, the application range of the magnetic core is expanded, the stability of the magnetic core in operation is ensured, and the design and the function realization of the magnetic device are facilitated.
In comparative example 1, the inductance attenuation rate of the prepared target magnetic core is 12.23% which is far higher than that of examples 1 and 2 under the same test method by adopting the conventional heat treatment process and not carrying out impregnation treatment on the magnetic core after heat treatment.
In comparative example 2, after the heat treatment is performed by the conventional heat treatment process, the impregnation treatment process in the technical scheme is used for impregnating the magnetic core after the heat treatment, and the inductance attenuation rate of the prepared nanocrystalline magnetic core is 11.63% under the same test method, which is improved compared with the inductance attenuation rate of the magnetic core without the impregnation treatment in comparative example 1, but is still far higher than that of examples 1 and 2.
In comparative example 3, the magnetic core is prepared by the preparation method of the technical scheme, but the components and the proportion of the glue paint are different from those of the technical scheme, and the inductance attenuation rate of the prepared magnetic core is 35.26 percent under the same test method and is far higher than that of the magnetic core prepared in example 1 and example 2.
As shown in fig. 3, in order to compare the dc bias abilities of the magnetic cores prepared in the respective examples and comparative examples, it can be seen that the dc bias abilities of the magnetic cores prepared in the examples 1 and 2 are apparently due to the dc bias abilities of the magnetic cores prepared in the comparative examples 1, 2 and 3.
In conclusion, it can be seen that the reason for the excellent properties of inventive examples 1 and 2 is mainly due to the heat treatment and the dip curing process of the inventive lacquer used in the magnetic core preparation process. As can be seen from fig. 3, the magnetic core obtained by matching the improved composite heat treatment process in the embodiments 1 and 2 of the present invention has a dc offset resistance significantly better than that of the magnetic core in the comparative example 1, and can meet the requirements of miniaturization, high efficiency, and high frequency, thereby widening the application range and facilitating the product application at the rear end of the magnetic core. The magnetic core and the glue paint are preheated before the magnetic core is solidified and are kept at 71-80 ℃, the glue paint has high activity and low viscosity at the temperature, the glue paint can be ensured to enter the nano-crystal magnetic core through the self gravity action, the surface cleanness of the magnetic core is ensured, the subsequent cutting of the magnetic core is facilitated, in addition, in order to further improve the viscosity and the fluidity of the glue paint, an organic solvent is adopted as a diluent, a vacuum impregnation and high-temperature baking mode is adopted for drying the magnetic core, the glue paint can quickly form a sealing film on the surface of the magnetic core under the high-temperature condition, the glue paint is ensured to be kept in the magnetic core, the problems of paint leakage, low strength and the like of the traditional conventional mode are solved, meanwhile, the high strength and low stress of the glue paint play a protection role in the direct current bias resistance of the magnetic core, and the finally prepared magnetic core is subjected to the application of 1.5A direct current at 100kHz/0.3V, the lowest inductance attenuation rate is reduced to 4.09% through the test, and the saturation resistance is high.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A method for preparing an amorphous nanocrystalline magnetic core with stable performance is characterized by comprising the following steps:
step S1, winding: winding the amorphous nanocrystalline strip into a magnetic core;
step S2, heat treatment: placing the magnetic core in a heat treatment furnace for heat treatment, and cooling to room temperature to obtain a heat-treated magnetic core;
step S3, pretreatment: preheating the magnetic core after heat treatment;
step S4, dip coating and curing: soaking the preheated magnetic core in pre-prepared and heat-insulating glue paint for vacuum impregnation and then baking and curing to obtain an amorphous nanocrystalline magnetic core with stable performance;
the manner of preparing the lacquer includes:
mixing resin, an ester compound and an organic solvent to prepare a glue paint, and then carrying out heat preservation on the glue paint.
2. The method according to claim 1, wherein the step S2 includes:
s21, placing the magnetic core in the heat treatment furnace, raising the heat treatment temperature of the heat treatment furnace from room temperature to a first temperature rise temperature within a first temperature rise time, and then preserving heat for a first heat preservation time;
step S22, raising the temperature of the heat treatment from the first temperature rise temperature to a second temperature rise temperature within a second temperature rise time, and then keeping the temperature for a second heat preservation time;
step S23, raising the temperature of the heat treatment from the second temperature raising temperature to a third temperature raising temperature within a third temperature raising time, and then keeping the temperature for a third heat preservation time;
s24, cooling the heat treatment temperature from the third temperature rise temperature to the first temperature drop temperature within first temperature drop time, then preserving heat for fourth heat preservation time, and applying a transverse magnetic field within the fourth heat preservation time;
and S25, cooling the heat treatment temperature from the first cooling temperature to a second cooling temperature, and then discharging from the furnace to cool to room temperature.
3. The preparation method according to claim 2, wherein the first temperature rise time is 50min to 120min, the first temperature rise temperature is 300 ℃ to 370 ℃, and the first temperature preservation time is 20min to 60min;
the second temperature rise time is 30min-80min, the second temperature rise temperature is 370 ℃ to 490 ℃, and the second heat preservation time is 60min-120min;
the third temperature rise time is 60min to 100min, the third temperature rise temperature is 520 ℃ to 580 ℃, and the third heat preservation time is 100min to 150min;
the first cooling time is 30-60 min, the first cooling temperature is 500-530 ℃, the fourth heat preservation time is 100-300 min, and the current of the transverse magnetic field is 50-65A;
the second cooling temperature is below 120 ℃.
4. The method according to claim 1, wherein in the step S3, the pre-treatment is to pre-heat the heat-treated magnetic core at 75-85 ℃ for 30-50 min.
5. The preparation method according to claim 1, characterized in that in the manner of preparing the gel coat, the gel coat is prepared according to the mixing ratio of 10-20% by mass of the resin, 40-60% by mass of the ester compound and the balance of the organic solvent, and then the gel coat is placed at 71-80 ℃ for 20-40 min.
6. The production method according to claim 1 or 5, characterized in that the resin is at least one of epoxy resin, polyurethane, silicone resin, polyimide, cyanate ester, and acrylic resin.
7. The method according to claim 1 or 5, wherein the ester compound is at least one of propylene glycol monoether acetate, polyacrylate, and aromatic isocyanate.
8. The method according to claim 1 or 5, wherein the organic solvent is one of ethanol, diethyl ether, ethyl acetate, acetone, xylene, toluene, and cyclohexane.
9. The production method according to claim 1, wherein in the step S4, the impregnation time of the vacuum impregnation is 10S to 30S.
10. The preparation method according to claim 1, wherein in the step S4, the baking and curing temperature is 120-180 ℃, and the baking time is 1-2 h.
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| CN117747285A (en) * | 2023-12-25 | 2024-03-22 | 东莞市昱懋纳米科技有限公司 | Method for obtaining nanocrystalline magnetic core with low magnetic permeability |
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| CN117747285A (en) * | 2023-12-25 | 2024-03-22 | 东莞市昱懋纳米科技有限公司 | Method for obtaining nanocrystalline magnetic core with low magnetic permeability |
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