CN115472397A - Interlayer insulating amorphous nanocrystalline magnetic core and preparation method thereof - Google Patents
Interlayer insulating amorphous nanocrystalline magnetic core and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
-
- 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
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/022—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) by winding the strips or ribbons around a coil
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention relates to the technical field of magnetic core devices, in particular to an interlayer insulated amorphous nanocrystalline magnetic core and a preparation method thereof, wherein the preparation method comprises the following steps: the surface of the magnetic core strip is plated with an inorganic crystal insulating film; the magnetic core strip is rolled to form the amorphous nanocrystalline magnetic core; the inorganic crystal insulating film positioned on the surface of the magnetic core strip on the outermost layer of the amorphous nanocrystalline magnetic core is an outer layer protective film of the amorphous nanocrystalline magnetic core. The invention has the beneficial effects that: through before rolling up the magnetic core, through plating inorganic crystal insulating film at magnetic core strip surface, increased the withstand voltage ability on magnetic core strip surface, and then make the magnetic core that rolls up and obtain can have better layer and magnetic core internal insulation characteristic after rolling up the magnetic core, avoided the risk of layer breakdown.
Description
Technical Field
The invention relates to the technical field of magnetic core devices, in particular to an interlayer insulating amorphous nanocrystalline magnetic core and a preparation method thereof.
Background
With the progress of science and technology, computer network technology is continuously developed, especially, the development of the fields of intelligent AI of 5G era, high-density recording technology, high-power high-frequency magnetic devices and the like is achieved, the devices have high performance, high quality, small volume and low cost, and therefore, the performance of metal functional materials such as soft magnetic alloy and the like for preparing the magnetic devices is required to be continuously improved and the cost is required to be reduced. The high Bs sub-nanocrystalline soft magnetic alloy is used as a new-generation functional material, has better soft magnetic performance than the conventional amorphous nanocrystalline, such as high saturation magnetic induction intensity, high saturation current intensity and the like, and is partially applied to the fields of wireless charging of electronic wearable equipment, transformers, inductors and the like.
In the prior art, there is a technical scheme of manufacturing a magnetic core by using an amorphous material and a nanocrystalline material. The technical scheme is that a magnetic core with a specific specification is usually coiled by a strip of amorphous material and nanocrystalline material, and the amorphous nanocrystalline magnetic core is obtained by magnetization treatment.
However, in the practical implementation process, the inventor finds that when the magnetic component is switched on by high-frequency electromagnetic pulses to work, corresponding eddy currents are induced in each layer of strip material in the magnetic core, induced voltages appear between adjacent layers, and when the adjacent layers are switched on, a large interlayer eddy current loop is formed, so that eddy current loss is rapidly increased, and further interlayer breakdown is caused.
Disclosure of Invention
In view of the above problems in the prior art, an interlayer insulating amorphous nanocrystalline core is now provided; on the other hand, also provides a preparation method of the amorphous nanocrystalline magnetic core.
The specific technical scheme is as follows:
an interlayer insulating amorphous nanocrystalline magnetic core, comprising:
the surface of the magnetic core strip is plated with an inorganic crystal insulating film;
the magnetic core strip is rolled to form the amorphous nanocrystalline magnetic core;
the inorganic crystal insulating film positioned on the surface of the magnetic core strip on the outermost layer of the amorphous nanocrystalline magnetic core is an outer layer protective film of the amorphous nanocrystalline magnetic core.
Preferably, the inorganic crystal insulating film is formed by preparing a mixed solution composed of gas phase nano-oxide particles, absolute ethyl alcohol, a surfactant, a silane coupling agent and an anti-settling agent.
Preferably, the mixed solution comprises 3-30% of the gas-phase nano-oxide particles and 50-75% of the anhydrous ethanol by mass fraction.
Preferably, the gas-phase nano-oxide particles are composed of two or more of gas-phase nano-silicon dioxide, nano-magnesium oxide and nano-alpha-aluminum oxide.
Preferably, the surface of the magnetic core strip is provided with a rolling pattern.
A method for preparing an amorphous nanocrystalline magnetic core is used for preparing the amorphous nanocrystalline magnetic core and comprises the following steps:
step S1: preparing a coating liquid;
step S2: preparing an inorganic crystal insulating film on the surface of the magnetic core strip by using the coating liquid;
and step S3: coiling the magnetic core strip to form a magnetic core to be treated;
and step S4: and carrying out heat treatment on the magnetic core to be treated and applying a transverse magnetic field to form the amorphous nanocrystalline magnetic core.
Preferably, the step S1 includes:
step S11: introducing gas-phase nano oxide particles into absolute ethyl alcohol, and dissolving the gas-phase nano oxide particles in the absolute ethyl alcohol through an ultrasonic crusher to form emulsion;
step S12: and adding a surfactant, a silane coupling agent and an anti-settling agent into the emulsion to form the coating liquid.
Preferably, the step S3 includes:
step S31: inputting the magnetic core strip into a rolling device, and rolling patterns on the magnetic core strip to form a rolled strip;
step S32: and rolling the rolled strip to form the magnetic core to be treated.
Preferably, in the step S31, the line width of the rolling pattern is between 0.08 and 0.2mm, and the depth is between 0.25 and 0.3 mm;
the pressure of the rolling equipment is between 10 and 150 Kg.
Preferably, in the step S4, the temperature of the heat treatment is 540-585 ℃, and the holding time of a single heat treatment is 50-180 min;
the transverse magnetic field intensity is 1000-3000A/m.
The technical scheme has the following advantages or beneficial effects: through before rolling up the magnetic core, through plating inorganic crystal insulating film on the magnetic core strip surface, increased the withstand voltage ability on magnetic core strip surface, and then make the magnetic core that rolls up and obtain can have better layer and magnetic core internal insulation characteristic after rolling up the magnetic core, avoided the risk of interlayer puncture.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a cross-sectional view of a magnetic core ribbon according to an embodiment of the present invention;
FIG. 2 is a schematic view of a production process in an example of the present invention;
FIG. 3 is a schematic diagram illustrating the substep of step S1 in the embodiment of the present invention;
FIG. 4 is a diagram illustrating the substep of step S3 according to an embodiment of the present invention;
FIG. 5 is a schematic view of a roll pattern in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention comprises the following steps:
an interlayer insulating amorphous nanocrystalline core, as shown in fig. 1, comprising:
the surface of the magnetic core strip A1 is plated with an inorganic crystal insulating film;
coiling the magnetic core strip A1 to form an amorphous nanocrystalline magnetic core;
the inorganic crystal insulating film A2 positioned on the surface of the magnetic core strip A1 at the outermost layer of the amorphous nanocrystalline magnetic core is an outer layer protective film of the amorphous nanocrystalline magnetic core.
Specifically, to the magnetic core part among the prior art, it can have stronger induced vortex under the high frequency electromagnetic pulse environment, and then leads to the problem of withstand voltage inefficacy between the layer, in this embodiment, through setting up inorganic crystal insulating film A2 as the coating film on magnetic core strip A1 surface, has improved the insulating nature on magnetic core strip A1 surface, has avoided the problem of withstand voltage inefficacy after rolling into the magnetic core, has improved the security of magnetic core.
Further, an insulating layer is formed on the surface of the magnetic core strip material in the mode of plating the inorganic crystal insulating film A2 before the magnetic core is rolled, and the steps of re-dipping the magnetic core in paint and forming a protective shell on the outer layer of the magnetic core after the magnetic core is prepared in the prior art are replaced, so that the preparation process of the amorphous nanocrystalline magnetic core is simplified, and the lower preparation cost is realized.
In a preferred embodiment, the material of the magnetic core strip A1 is at least one of amorphous soft magnetic alloy powder and nanocrystalline soft magnetic alloy powder.
Specifically, in order to realize that the finally prepared magnetic core has better magnetic induction intensity, in this embodiment, the material of the magnetic core strip A1 is controlled to be at least one of amorphous soft magnetic alloy powder and nanocrystalline soft magnetic alloy powder, and the actual mixture ratio of each component in the magnetic core strip is adjusted in the actual production process, so as to realize better electrical performance of the magnetic core.
In a preferred embodiment, the inorganic crystal insulating film A2 is formed by preparing a mixed solution composed of vapor phase nano-oxide particles, anhydrous ethanol, a surfactant, a silane coupling agent, and an anti-settling agent.
In a preferred embodiment, the mixed solution comprises 3-30% of gas-phase nano-oxide particles and 50-75% of anhydrous ethanol.
Specifically, in the embodiment, a mixed solution composed of 3% -30% by mass of vapor phase nano oxide particles, 50% -75% by mass of absolute ethyl alcohol, and a specific surfactant, a silane coupling agent, and an anti-settling agent is adopted to spray and dry the surface of a magnetic core strip A1, so that a uniform film mainly composed of the vapor phase nano oxide particles is formed on the surface of the magnetic core strip A1 after the absolute ethyl alcohol is evaporated to serve as an inorganic crystal insulating film A2, the thickness of an insulating layer on the surface of the magnetic core strip A1 is increased, and the interlayer withstand voltage capability of the magnetic core is improved.
In a preferred embodiment, the fumed nano-oxide particles are composed of two or more of fumed nano-silica, nano-magnesia and nano-alpha-alumina.
Specifically, in order to make the amorphous nanocrystalline magnetic core have a better interlayer withstand voltage capability, in this embodiment, when the mixed solution is prepared, the coating liquid is prepared by selecting the gas-phase nano-oxide particles with a specific ratio, and further, the control of the surface resistance of the finally formed inorganic crystal insulating film A2 is realized.
In the implementation process, the gas phase nano silicon dioxide, the nano magnesium oxide and the nano alpha-aluminum oxide are all materials which can be directly purchased, and the expressions of the gas phase nano silicon dioxide, the nano magnesium oxide and the nano alpha-aluminum oxide can be changed to a certain extent according to the actual conditions, such as nano aluminum oxide (alpha phase) and the like, but the implementation of the scheme is not influenced.
Specifically, the mass ratio and surface resistance of the coating solution of each component are shown in table 1 below:
TABLE 1
In a preferred embodiment, the surface of the core strip A1 is provided with a roll pattern.
Specifically, for the magnetic core in the prior art, which is easy to generate induced eddy current in a high-frequency environment, and thus causes a problem of increased loss, in this embodiment, the magnetic core strip is rolled between the rolled magnetic core strips A1, a fracture surface with a specific rolling pattern is formed on the magnetic core strip A1, and then ji increases the magnetic permeability of the magnetic core, so that the finally prepared amorphous nanocrystalline magnetic core has a lower eddy current loss.
In a preferred embodiment, the rolling pattern is a regular pattern including regular hexagons, corrugations, squares, rectangles.
A method for preparing an amorphous nanocrystalline magnetic core, as shown in fig. 2, comprises:
step S1: preparing a coating liquid;
step S2: preparing an inorganic crystal insulating film on the surface of the magnetic core strip by adopting a film coating liquid;
and step S3: rolling the magnetic core strip to form a magnetic core to be treated;
and step S4: and carrying out heat treatment on the magnetic core to be treated and applying a transverse magnetic field to form the amorphous nanocrystalline magnetic core.
Specifically, in order to enable the finally prepared amorphous nanocrystalline magnetic core to have good interlayer insulation characteristics and low eddy current loss, in the embodiment, the coating liquid is prepared in advance, the inorganic crystal insulating film is prepared in advance before the magnetic core strip is rolled, and then the magnetic core strip is rolled, heat treated and magnetized, so that good interlayer voltage resistance of the amorphous nanocrystalline magnetic core is realized.
Further, in the embodiment, before winding the magnetic core, the coating liquid is sprayed on the surface of the magnetic core strip and dried and cured to form the inorganic crystal insulating film, and after the magnetic core is wound, the outermost inorganic crystal insulating film is used as the outer protective layer of the amorphous nanocrystalline magnetic core, so that the step of dipping the paint is replaced, and the working procedure is saved.
In a preferred embodiment, as shown in fig. 3, step S1 comprises:
step S11: pouring the gas-phase nano oxide particles into absolute ethyl alcohol, and stirring to form a suspension;
step S12: dispersing and crushing the turbid liquid by using an ultrasonic crusher, and simultaneously adding a surfactant, a silane coupling agent and an anti-settling agent into the turbid liquid to uniformly disperse the turbid liquid to obtain an emulsion;
step S13: and sequentially filtering the emulsion by adopting a plurality of screens to obtain the coating liquid.
Specifically, in order to realize the preparation of the uniform inorganic crystal insulating layer, in this embodiment, after a certain amount and proportion of vapor phase nano oxide particles are weighed, the vapor phase nano oxide particles are poured into anhydrous ethanol to be pre-stirred to form a suspension, an ultrasonic crusher is used for crushing the suspension, a surfactant, a silane coupling agent and an anti-settling agent are added in the crushing process to enable the suspension to be uniformly dispersed to form an emulsion, and then a plurality of layers of screens with sequentially increasing meshes are used for sieving to obtain a coating solution, so that a better preparation effect can be realized through the uniformly distributed emulsion-shaped coating solution in the subsequent preparation process of the inorganic crystal insulating layer.
In a preferred embodiment, in step S12, 1% by mass of a surfactant, 1% to 2% by mass of a silane coupling agent, and 1% by mass of an anti-settling agent are added during crushing.
In a preferred embodiment, the surfactant is alkylolamide 6501 and the anti-settling agent is polyoxyethylene fatty amine (alcohol).
In a preferred embodiment, as shown in fig. 4, step S3 comprises:
step S31: inputting the magnetic core strip into a rolling device, and rolling patterns on the magnetic core strip to form a rolled strip;
step S32: and rolling the rolled strip to form the magnetic core to be treated.
Specifically, for the magnetic core in the prior art, there is a problem of strong induced eddy current in a high-frequency environment, in this embodiment, before rolling the magnetic core, a magnetic core strip is input into a rolling device to roll the surface of the magnetic core strip to form a rolling pattern as shown in fig. 5, so that the surface of the magnetic core strip has a uniform cracked surface, thereby reducing the eddy current of the finally formed magnetic core and realizing lower loss.
In a preferred embodiment, in step S31, the line width of the rolled pattern is between 0.08 and 0.2mm, and the depth is between 0.25 and 0.3 mm;
the pressure of the rolling equipment is between 10 and 150 Kg.
In a preferred embodiment, in step S4, the temperature of the heat treatment is 540-585 ℃, and the holding time of single heat treatment is 50-180 min;
the transverse magnetic field intensity is 1000-3000A/m.
The scheme will now be further illustrated with reference to the following examples and comparative examples:
example 1
Weighing 3-30% of gas-phase nano oxide particles, pouring the gas-phase nano oxide particles into 50-75% of absolute ethyl alcohol by mass fraction, fully dissolving the particles by an ultrasonic crusher to form emulsion, and adding a certain mass fraction of surfactant, silane coupling agent and anti-settling agent to form coating liquid;
spraying inorganic crystal coating liquid on the upper and lower surfaces of a magnetic core strip which is cut in advance to a specific size in a spraying mode until the upper and lower surfaces are dried to form an inorganic crystal insulating film;
inputting a magnetic core strip with an inorganic crystal insulating film into a feeding device, setting the pressure of a pattern roller to be 80-150Kg, acting on the surface of the strip to form rolling pattern lines, and winding the rolling pattern lines into a magnetic core to be processed with specified size through a buffer roller;
starting a heating system, closing a furnace chamber door, vacuumizing the furnace body, closing a vacuum pump when the vacuum requirement is met, and introducing nitrogen into the furnace body;
heating to 250 ℃, and putting the magnetic core to be treated;
starting a magnetic field, wherein the magnetic field intensity is 2600A/m;
heating to 490 deg.C, holding for 90min, heating to 550 deg.C, holding for 90min, cooling to 200 deg.C, and discharging the magnetic core.
Comparative example 1
Selecting the magnetic core strip material same as that in the embodiment 1, directly inputting the magnetic core strip material into a feeding device, setting the pressure of a pattern roller to be 80-150Kg, forming rolling pattern lines on the surface of the strip material, and winding the strip material into a magnetic core to be processed with a specified size through a buffer roller;
starting a heating system, closing a furnace chamber door and vacuumizing a furnace body; the vacuum pump is closed when the vacuum requirement is met, and nitrogen is introduced into the furnace body;
heating to 250 ℃, and putting the magnetic core to be treated;
heating to 490 deg.C, holding for 90min, heating to 550 deg.C, holding for 90min, cooling to 200 deg.C, and discharging the magnetic core.
Comparative example 2
Selecting the magnetic core strip material same as the magnetic core strip material in the embodiment 1, directly inputting the magnetic core strip material into a feeding device, setting the pressure of a pattern roller to be 80-150Kg, forming rolling pattern lines on the surface of the magnetic core strip material, and winding the magnetic core strip material into a magnetic core to be processed with specified size through a buffer roller;
starting a heating system, closing a furnace chamber door and vacuumizing a furnace body; the vacuum pump is closed when the vacuum requirement is met, and nitrogen is introduced into the furnace body;
heating to 250 ℃, and putting the magnetic core to be treated;
starting a magnetic field, wherein the magnetic field intensity is 2600A/m;
heating to 490 deg.C, holding for 90min, heating to 550 deg.C, holding for 90min, cooling to 200 deg.C, and discharging the magnetic core.
Comparative example 3
Directly rolling the magnetic core strip material of the embodiment 1 into a magnetic core to be treated;
starting a heating system, closing a furnace chamber door and vacuumizing a furnace body;
the vacuum pump is closed when the vacuum requirement is met, and nitrogen is introduced into the furnace body
Heating to 250 ℃, and putting the magnetic core to be treated;
starting a magnetic field, wherein the magnetic field intensity is 2600A/m;
heating to 490 deg.C, holding for 90min, heating to 550 deg.C, holding for 90min, cooling to 200 deg.C, and discharging the magnetic core.
Comparative example 4
Directly rolling the magnetic core strip material of the embodiment 1 into a magnetic core to be treated;
starting a heating system, closing a furnace chamber door and vacuumizing a furnace body;
closing the vacuum pump, and introducing nitrogen into the furnace body;
heating to 250 ℃, and putting the magnetic core to be treated; heating to 490 deg.C, maintaining for 60min, heating to 550 deg.C, maintaining for 90min, and cooling to 200 deg.C.
In summary, the performance tests of loss (Pc) @1MHz, hysteresis loss @1MHz, and eddy current loss @1MHz were performed on the high Bs nanocrystalline magnetic rings prepared in examples 1 to 5 of the present invention and the comparative example, and the measured data are shown in table 2:
| case(s) | Plating inorganic crystal film | Rolling pressure (Kg) | Magnetic field intensity (A/m) | Ph(KW/M3) | pe(KW/M3) | pc(KW/M3) |
| Example 1 | Is that | 50 | 2600 | 52 | 185 | 237 |
| Comparative example 1 | \ | 50 | \ | 60 | 455 | 517 |
| Comparative example 2 | \ | 50 | 2600 | 52 | 403 | 455 |
| Comparative example 3 | \ | \ | 2600 | 61 | 459 | 520 |
| Comparative example 4 | \ | \ | \ | 100 | 500 | 601 |
TABLE 2
From the data of table 2, it can be seen that the difference between example 1 and comparative example 2 is whether the inorganic oxide crystal film is plated or not, and by comparing the test data of the two, the hysteresis loss is the same for example 1 and comparative example 2, but the eddy current loss is significantly lower for example 1 than for comparative example 2, and the total loss is also lower. Thus, the coating of the inorganic oxide crystal film can effectively reduce the eddy current loss under high-frequency application.
The proportion of the coating liquid is adjusted according to the width of the nanocrystalline and the thickness of the coating, and the coating is not uniform when the content is too small, and the requirement of the coating process cannot be met when the content is too large. The solid content ratio is not illustrated here. The thickness of the plated film is 0.5-2 μm in general. The inorganic crystal coating liquid is prepared by experiment, wherein the main components of the inorganic crystal coating liquid comprise 3-30% of gas-phase nano oxide particles, 50-75% of absolute ethyl alcohol (analytically pure), a silane coupling agent, an active agent and an anti-settling agent. The nano oxide particles are composed of two or more of gas phase nano silicon dioxide, nano magnesium oxide and nano alpha-aluminum oxide.
Comparison of example 2, comparative example 2 and comparative example in the absence of applied magnetic field, comparison of hysteresis loss, eddy current loss and total loss in example 2 and comparative example 2 at different ultrasonic powers, it can be seen that the decrease with increasing ultrasonic power and that examples 2, 3 are significantly superior to conventional heat treatment comparative example.
Comparative examples 1, 2 and 3 were compared for coercivity and loss,
1. comparing the comparative example 1 with the comparative example 2 under the same embossing roll pressure and with or without the applied magnetic field, the coercive force and the loss of the comparative example 2 are obviously superior to those of the comparative example 1, and the fact that the coercive force and the loss of the nanocrystalline magnetic core are further reduced through the heat treatment of the applied magnetic field under the embossing roll mechanical compression stress treatment is illustrated.
2. Comparing comparative example 1 and comparative example 2 at the same time, the coercive force and loss were almost identical. It is known that the effects of reducing loss and improving performance can be almost achieved by mechanical compressive stress treatment and conventional heat treatment and magnetic field heat treatment. Clearly superior to comparative example 3.
In conclusion, the nanocrystalline magnetic core subjected to the inorganic oxide crystal film plating, the magnetic field heat treatment and the ultrasonic rolling device and magnetic field heat treatment has the lowest loss, so that the internal magnetic domain direction of the nanocrystalline microcosmic world is changed, the internal stress of the nanocrystalline material is further released, the surface resistivity is synchronously increased, and the eddy current loss under high frequency is reduced. The magnetic performance of the nano-crystal is improved and the loss of the nano-crystal is reduced.
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. An interlayer insulating amorphous nanocrystalline magnetic core, comprising:
the surface of the magnetic core strip is plated with an inorganic crystal insulating film;
the magnetic core strip is rolled to form the amorphous nanocrystalline magnetic core;
the inorganic crystal insulating film positioned on the surface of the magnetic core strip on the outermost layer of the amorphous nanocrystalline magnetic core is an outer layer protective film of the amorphous nanocrystalline magnetic core.
2. An amorphous nanocrystalline magnetic core according to claim 1, wherein the inorganic crystal insulating film is formed by preparing a mixed solution composed of gas phase nano-oxide particles, absolute ethyl alcohol, a surfactant, a silane coupling agent, and an anti-settling agent.
3. The amorphous nanocrystalline magnetic core according to claim 2, characterized in that the mixed solution contains 3-30% by mass of the vapor-phase nano-oxide particles and 50-75% by mass of the anhydrous ethanol.
4. The amorphous nanocrystalline magnetic core according to claim 2, characterized in that the fumed nano-oxide particles are composed of two or more of fumed nano-silica, nano-magnesia, and nano-alpha-alumina.
5. The amorphous nanocrystalline core according to claim 1, characterized in that the core strip surface is provided with a rolled pattern.
6. A method for producing an amorphous nanocrystalline magnetic core, for producing an amorphous nanocrystalline magnetic core according to any one of claims 1 to 5, comprising:
step S1: preparing a coating liquid;
step S2: preparing an inorganic crystal insulating film on the surface of the magnetic core strip by using the coating liquid;
and step S3: coiling the magnetic core strip to form a magnetic core to be treated;
and step S4: and carrying out heat treatment on the magnetic core to be treated and applying a transverse magnetic field to form the amorphous nanocrystalline magnetic core.
7. The method according to claim 6, wherein the step S1 includes:
step S11: pouring the gas-phase nano oxide particles into absolute ethyl alcohol, and stirring to form a suspension;
step S12: dispersing and crushing the turbid liquid by using an ultrasonic crusher, and simultaneously adding a surfactant, a silane coupling agent and an anti-settling agent into the turbid liquid to uniformly disperse the turbid liquid to obtain an emulsion;
step S13: and sequentially filtering the emulsion by adopting a plurality of screens to obtain the coating liquid.
8. The method according to claim 6, wherein the step S3 includes:
step S31: inputting the magnetic core strip material into a rolling device, and rolling patterns on the magnetic core strip material to form a rolled strip material;
step S32: and rolling the rolled strip to form the magnetic core to be treated.
9. The method according to claim 8, wherein in the step S31, the roll patterns have a line width of 0.08 to 0.2mm and a depth of 0.25 to 0.3 mm;
the pressure of the rolling equipment is between 10 and 150 Kg.
10. The method according to claim 6, wherein in the step S4, the temperature of the heat treatment is 540-585 ℃, and the holding time of a single heat treatment is 50-180 min;
the transverse magnetic field intensity is 1000-3000A/m.
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