CN113488330B - Preparation method of functional magnetic slurry and magnetic device - Google Patents
Preparation method of functional magnetic slurry and magnetic device Download PDFInfo
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- CN113488330B CN113488330B CN202110803008.1A CN202110803008A CN113488330B CN 113488330 B CN113488330 B CN 113488330B CN 202110803008 A CN202110803008 A CN 202110803008A CN 113488330 B CN113488330 B CN 113488330B
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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
- H01F41/0253—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 for manufacturing permanent magnets
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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
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
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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
Abstract
The invention discloses a preparation method of functional magnetic slurry and a magnetic device, which belong to the field of magnetic materials, and the preparation method comprises the following steps of S1, weighing magnetic powder with preset quality; s2, preprocessing the magnetic powder; step S3, dissolving organic resin into colloid to obtain dissolved silicone resin, wherein the organic resin comprises organic fluorine silicone resin, modified epoxy silicone resin and flexible silicone resin; and S4, directly and uniformly mixing the second powder pretreated in the step S2 and the dissolved silicon resin obtained in the step S3, or uniformly mixing after adding sulfate and/or glass powder, and then adding a dispersing agent and a curing agent to obtain the magnetic slurry. The invention has the beneficial effects that: the device can be optimized in comprehensive performance by selectively adding the activation capability to the surface of the magnetic powder, and/or the ultrasonic dispersion insulation treatment wrapping is more uniform and compact, and/or the voltage and current resistant performance of the fluorosilicone resin.
Description
Technical Field
The invention relates to the field of magnetic materials, in particular to a preparation method of functional magnetic slurry and a magnetic device.
Background
The electronic components are the basic stone for supporting the development of the information technology industry, and are also the key for guaranteeing the safety and stability of the industry chain supply chain, so as to accelerate the high-quality development of the electronic components industry, promote the advanced industry foundation and the modernization of the industry chain, promote the development of the information technology industry in China, and the electronic industry has increasingly demanded high-performance soft magnetic powder materials. The nano carbonyl/hydroxy iron powder has high magnetic flux rate under high frequency and ultrahigh frequency, is widely applied to the manufacture of magnetic materials, and has an irreplaceable effect in the manufacturing materials of high-frequency iron powder cores.
At present, in the prior art, a plurality of resins and inorganic coating materials are generally adopted to be mixed and then are coated with powder, so that the powder cannot be fully coated, and voltage breakdown is caused; the powder surface is subjected to phosphating treatment to form a layer of phosphating film, and the phosphating film can cause poor magnetic performance and other performances, so that the electromagnetic performance requirements of complex and various inductances under the high-speed development of the electronic industry are difficult to meet, and therefore, aiming at the problems, a preparation method of functional magnetic slurry and a magnetic device are urgently needed to be designed so as to meet the actual use needs.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of functional magnetic slurry and a magnetic device, and the device is optimized in comprehensive performance by selectively adding activation capability to the surface of magnetic powder, and/or ultrasonic dispersion insulation treatment and encapsulation to be more uniform and compact, and/or voltage and current resistance of fluorosilicone resin.
The technical problems solved by the invention can be realized by adopting the following technical scheme:
a method for preparing a functional magnetic slurry, comprising:
step S1, weighing magnetic powder with preset quality;
s2, preprocessing the magnetic powder;
step S3, dissolving organic resin into colloid to obtain dissolved silicone resin, wherein the organic resin comprises organic fluorine silicone resin, modified epoxy silicone resin and flexible silicone resin;
and S4, directly and uniformly mixing the pretreated powder in the step S2 and the dissolved silicon resin obtained in the step S3, or uniformly mixing after adding sulfate and/or glass powder, and then adding a dispersing agent and a curing agent to obtain the magnetic slurry.
Preferably, in the step S2, the preprocessing the magnetic powder includes:
diluting sulfuric acid in a solvent, stirring and dispersing uniformly, and adding a surfactant with the mass fraction of 0-5% to obtain an activated solution, wherein the solvent is one or more of ethanol and pure water, and the mass fraction of the solvent is 0.1-10%;
and mixing the magnetic powder with the activation solution, drying the mixed solution, and screening by a screen to obtain activated first powder.
Preferably, in the step S2, the drying treatment is performed on the mixed solution, and specifically includes:
the drying temperature is 70 ℃, the drying time is 35min, and the drying time is 50-120 min after the temperature is raised to 120-125 ℃.
Preferably, in the step S2, the preprocessing of the magnetic powder further includes:
carrying out ultrasonic dispersion insulation treatment on the magnetic powder, specifically, dispersing and dissolving gas-phase carbon dioxide and/or silicon carbide by ultrasonic, and uniformly attaching the surface of the non-activated magnetic powder; or alternatively
And (2) performing ultrasonic dispersion and dissolution on the gas-phase carbon dioxide and/or silicon carbide, and uniformly attaching the gas-phase carbon dioxide and/or the silicon carbide to the surface of the first powder after the activation treatment in the step (S2).
Preferably, in the step S3, the mass ratio of the organic resin, the sulfate and the glass powder is (1-5): 0.2-3): 0.1-2;
the organic resin, the sulfate and the glass powder account for 1.5 to 60 percent of the total mass.
Preferably, in the step S3, the mass ratio of the organic fluorine silicone resin to the modified epoxy silicone resin to the flexible silicone resin is 1.5:1:1 to 5:3:2.
Preferably, in the step S4, the solid content of the magnetic slurry is 68.5 to 98.6%.
Preferably, the magnetic powder is one or a combination of a plurality of hydroxy iron powder, carbonyl iron powder and amorphous nanocrystalline iron powder;
the particle size of the magnetic powder is 0.9-5 um.
The invention also provides a magnetic device, which is prepared by the preparation method of the functional magnetic slurry, comprising the following steps:
the magnetic slurry is filled in a device cavity of a built-in coil through knife coating or pressing, then is baked and solidified, and then is printed or sprayed with an encapsulation layer, and finally, a single magnetic device is obtained through a cutting process.
Preferably, the curing temperature of the baking and curing is 150-180 ℃ and the curing time is 120-270 min.
The invention has the beneficial effects that:
the invention provides a preparation method of functional magnetic slurry and a magnetic device, which ensure that the device achieves the best comprehensive performance by selectively adding activation capability to the surface of magnetic powder, and/or ultrasonic dispersion insulation treatment and encapsulation to be more uniform and compact, and/or the voltage and current resistance of fluorosilicone resin, improves the magnetic characteristic parameters such as saturated magnetic flux density, magnetic permeability and the like, and simultaneously strengthens the breakdown capability of current and voltage resistance, so that the device has better salt spray corrosion resistance and mechanical capability, the preparation method is simple, the operation is easy, the requirements on raw materials and equipment are lower, and the batch high-efficiency industrialized application of the inductor can be realized.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing a functional magnetic slurry according to the present invention;
FIG. 2 is a schematic flow chart of an embodiment of adding an activation treatment to the surface of a magnetic powder according to the present invention;
FIG. 3 is a schematic flow chart of an embodiment of ultrasonic dispersion insulation treatment for non-activated magnetic powder according to the present invention;
FIG. 4 is a schematic flow chart of an embodiment of ultrasonic dispersion insulation treatment for activated powder according to the present invention;
FIG. 5 is a microstructure of an embodiment of the unactivated powder according to the present invention;
FIG. 6 is a microstructure of an embodiment of the activated powder in accordance with the present invention;
FIG. 7 is a block diagram illustrating an embodiment of the effect of screen sieving of different mesh sizes on magnetic properties such as inductance and Q.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The invention provides a preparation method of functional magnetic slurry, which belongs to the field of magnetic materials, and as shown in fig. 1-7, comprises the following steps:
step S1, weighing magnetic powder with preset quality;
s2, preprocessing the magnetic powder;
step S3, dissolving organic resin into colloid to obtain dissolved silicone resin, wherein the organic resin comprises organic fluorine silicone resin, modified epoxy silicone resin and flexible silicone resin;
and S4, directly and uniformly mixing the pretreated powder in the step S2 and the dissolved silicone resin obtained in the step S3, or uniformly mixing after adding sulfate and/or glass powder, and then adding a dispersing agent and a curing agent to obtain the magnetic slurry.
As a preferred embodiment, as shown in fig. 2, 5 and 6, in step S2, the magnetic powder is subjected to pretreatment including:
diluting sulfuric acid in a solvent, stirring and dispersing uniformly, and adding a surfactant with the mass fraction of 0% -5% to obtain an activated solution, wherein the solvent is one or more of ethanol and pure water, and the mass fraction of the solvent is 0.1% -10%;
and mixing the magnetic powder with the activation solution, drying the mixed solution, and screening by a screen to obtain the activated first powder.
In a preferred embodiment, in step S2, the mixed solution is subjected to a drying process, specifically including:
the drying temperature is 70 ℃, the drying time is 35min, and the drying time is 50-120 min after the temperature is raised to 120-125 ℃.
As a preferred embodiment, as shown in fig. 3 to 4, in step S2, the magnetic powder is pretreated, and further includes:
performing ultrasonic dispersion insulation treatment on the magnetic powder, specifically, performing ultrasonic dispersion dissolution on gas-phase carbon dioxide and/or silicon carbide, and uniformly attaching the gas-phase carbon dioxide and/or silicon carbide to the surface of the magnetic powder which is not subjected to the activation treatment in the step S2; or alternatively
And (3) dispersing and dissolving the gas-phase carbon dioxide and/or silicon carbide by ultrasonic waves, and uniformly attaching the gas-phase carbon dioxide and/or the silicon carbide to the surface of the first powder after the activation treatment in the step S2.
In the step S3, the mass ratio of the organic resin to the sulfate to the glass powder is (1-5): 0.2-3): 0.1-2;
the organic resin, sulfate and glass powder account for 1.5 to 60 percent of the total mass.
In a preferred embodiment, in step S3, the mass ratio of the organic fluorine silicone resin, the modified epoxy silicone resin, and the flexible silicone resin is 1.5:1:1 to 5:3:2.
In a preferred embodiment, in step S4, the solid content of the magnetic slurry is 68.5 to 98.6%.
As a preferred embodiment, the magnetic powder is one or a combination of a plurality of hydroxy iron powder, carbonyl iron powder and amorphous nanocrystalline iron powder;
the particle size of the magnetic powder is 0.9-5 um.
The invention also provides a magnetic device, which is prepared by the preparation method of the functional magnetic slurry, comprising the following steps:
the magnetic slurry is filled in a device cavity of a built-in coil through knife coating or pressing, then is baked and solidified, and then is printed or sprayed with an encapsulation layer, and finally, a single magnetic device is obtained through a cutting process.
As a preferred embodiment, the curing temperature of the baking curing is 150-180 ℃ and the curing time is 120-270 min.
Hereinafter, four specific examples are provided to further illustrate and describe the present technical solution:
example 1:
a preparation method of voltage-current breakdown resistant functional magnetic slurry and a magnetic device comprise the following steps:
powder activation treatment: weighing carbonyl iron powder with preset mass which is 400g; adding carbonyl iron powder and slow powder into an activation solution, uniformly mixing, standing at room temperature for 150-210min, washing the powder with ethanol, airing the activated powder, putting the dried powder into a blast drying oven, baking at 75 ℃ for 25min, heating to 120 ℃ for 70min, and sieving with a 200-mesh screen to obtain first powder;
specifically, 9.6mL of sulfuric acid is weighed before activation treatment, added into 1.79L of deionized water for dilution, stirred and dispersed uniformly, and 12g of surfactant is added to form an activation solution;
crushing and dispersing powder by ultrasonic waves: 7g of gas phase nano silicon dioxide is weighed, 7g of gas phase nano silicon dioxide is poured into 356mL of ethanol or methanol, ultrasonic equipment is started for crushing, dispersing and dissolving, the power of the ultrasonic equipment is 210W, 200g of activated first powder is weighed and poured into dispersion solution after uniform dissolution, and ultrasonic crushing and dispersing are continued; after the completion, filtering through 800 mesh, 1000 mesh and 1200 mesh screens respectively, and then drying, wherein the drying process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 125deg.C, and baking for 105min; screening the powder by using a 200-mesh screen to obtain second powder;
dissolving silicone resin: 180g of isophorone serving as a solvent is added into a triangular pyramid bottle container, and the mixture is heated to 42 ℃ at constant temperature; weighing 60g of organic fluorine silicon resin, 40g of epoxy modified silicon resin and 20g of flexible silicon resin, slowly adding the organic fluorine silicon resin, the epoxy modified silicon resin and the flexible silicon resin into a container, and fully stirring and dissolving for 12 hours;
and (3) preparing slurry: 150g of second powder after ultrasonic crushing and dispersing treatment, 11.25g of dissolved silicone resin, 3.6g of nano sulfate and 0.9g of nano glass powder are weighed, and 21g of isophorone or diheptone solvent is added. Mixing the materials together, rotating for 30min by a high-power centrifugal force dispersing machine, adding 2g of dispersing agent and 2g of curing agent, and rotating for 20min to uniformly disperse to obtain the magnetic slurry.
Filling a device cavity with the prepared magnetic slurry: the magnetic slurry is filled in the device cavity of the built-in coil through a scraping or pressing process, and baking treatment is carried out, wherein the baking treatment process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 175 deg.C, baking for 120min, printing or spraying packaging ink, and cutting to obtain individual magnetic device as electronic component.
Example 2:
a preparation method of voltage-current breakdown resistant functional magnetic slurry and a magnetic device comprise the following steps:
powder activation treatment: weighing carbonyl iron powder with preset mass which is 400g; before the activation treatment, 9.6mL of sulfuric acid is weighed, added into 1.79L of deionized water for dilution, stirred and dispersed uniformly, and 12g of surfactant is added to form an activation solution; adding carbonyl iron powder and slow powder into an activation solution, uniformly mixing, standing at room temperature for 150-210min, then cleaning the powder with ethanol, airing the activated powder, putting the dried powder into a blast drying oven, baking at 75 ℃ for 25min, heating to 120 ℃ for 70min, and then sieving with a 200-mesh screen to obtain first powder;
dissolving silicone resin: 180g of isophorone serving as a solvent is added into a triangular pyramid bottle container, and the mixture is heated to 42 ℃ at constant temperature; weighing 60g of organic fluorine silicon resin, 40g of epoxy modified silicon resin and 20g of flexible silicon resin, slowly adding the organic fluorine silicon resin, the epoxy modified silicon resin and the flexible silicon resin into a container, and fully stirring and dissolving for 12 hours;
and (3) preparing slurry: 150g of second powder after ultrasonic crushing and dispersing treatment, 11.25g of dissolved silicone resin, 3.6g of nano sulfate and 0.9g of nano glass powder are weighed, and 21g of isophorone or diheptone solvent is added. Mixing the materials together, rotating for 30min by a high-power centrifugal force dispersing machine, adding 2g of dispersing agent and 2g of curing agent, and rotating for 20min to uniformly disperse to obtain the magnetic slurry.
Filling a device cavity with the prepared magnetic slurry: the magnetic slurry is filled in the device cavity of the built-in coil through a scraping or pressing process, and baking treatment is carried out, wherein the baking treatment process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 175 deg.C, baking for 120min, printing or spraying packaging ink, and cutting to obtain individual magnetic device as electronic component.
Example 3:
a preparation method of voltage-current breakdown resistant functional magnetic slurry and a magnetic device comprise the following steps:
powder activation treatment: weighing carbonyl iron powder with preset mass which is 400g; before the activation treatment, 9.6mL of sulfuric acid is weighed, added into 1.79L of deionized water for dilution, stirred and dispersed uniformly, and 12g of surfactant is added to form an activation solution; adding carbonyl iron powder and slow powder into an activation solution, uniformly mixing, standing at room temperature for 150-210min, then cleaning the powder with ethanol, airing the activated powder, putting the dried powder into a blast drying oven, baking at 75 ℃ for 25min, heating to 120 ℃ for 70min, and then sieving with a 200-mesh screen to obtain first powder;
crushing and dispersing powder by ultrasonic waves: 7g of gas phase nano silicon dioxide is weighed, 7g of gas phase nano silicon dioxide is poured into 356mL of ethanol or methanol, ultrasonic equipment is started for crushing, dispersing and dissolving, the power of the ultrasonic equipment is 210W, 200g of activated first powder is weighed and poured into dispersion solution after uniform dissolution, and ultrasonic crushing and dispersing are continued; after the completion, filtering through 800 mesh, 1000 mesh and 1200 mesh screens respectively, and then drying, wherein the drying process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 125deg.C, and baking for 105min; screening the powder by using a 200-mesh screen to obtain second powder;
dissolving silicone resin: 180g of isophorone serving as a solvent is added into a triangular pyramid bottle container, and the mixture is heated to 42 ℃ at constant temperature; weighing 60g of organic fluorine silicon resin, 40g of epoxy modified silicon resin and 20g of flexible silicon resin, slowly adding the organic fluorine silicon resin, the epoxy modified silicon resin and the flexible silicon resin into a container, and fully stirring and dissolving for 12 hours;
and (3) preparing slurry: 150g of the second powder after ultrasonic crushing and dispersing treatment and 11.25g of dissolved silicone resin are weighed, and 21g of isophorone or diheptanone solvent is added. Mixing the materials together, rotating for 30min by a high-power centrifugal force dispersing machine, adding 2g of dispersing agent and 2g of curing agent, and rotating for 20min to uniformly disperse to obtain the magnetic slurry.
Filling a device cavity with the prepared magnetic slurry: the magnetic slurry is filled in the device cavity of the built-in coil through a scraping or pressing process, and baking treatment is carried out, wherein the baking treatment process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 175 deg.C, baking for 120min, printing or spraying packaging ink, and cutting to obtain individual magnetic device as electronic component.
Example 4
A preparation method of voltage-current breakdown resistant functional magnetic slurry and a magnetic device comprise the following steps:
crushing and dispersing powder by ultrasonic waves: 7g of gas phase nano silicon dioxide is weighed, 7g of gas phase nano silicon dioxide is poured into 356mL of ethanol or methanol, ultrasonic equipment is started for crushing, dispersing and dissolving, the power of the ultrasonic equipment is 210W, 200g of activated first powder is weighed and poured into dispersion solution after uniform dissolution, and ultrasonic crushing and dispersing are continued; after the completion, filtering through 800 mesh, 1000 mesh and 1200 mesh screens respectively, and then drying, wherein the drying process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 125deg.C, and baking for 105min; screening the powder by using a 200-mesh screen to obtain second powder;
dissolving silicone resin: 180g of isophorone serving as a solvent is added into a triangular pyramid bottle container, and the mixture is heated to 42 ℃ at constant temperature; weighing 60g of organic fluorine silicon resin, 40g of epoxy modified silicon resin and 20g of flexible silicon resin, slowly adding the organic fluorine silicon resin, the epoxy modified silicon resin and the flexible silicon resin into a container, and fully stirring and dissolving for 12 hours;
and (3) preparing slurry: 150g of second powder after ultrasonic crushing and dispersing treatment, 11.25g of dissolved silicone resin, 3.6g of nano sulfate and 0.9g of nano glass powder are weighed, and 21g of isophorone or diheptone solvent is added. Mixing the materials together, rotating for 30min by a high-power centrifugal force dispersing machine, adding 2g of dispersing agent and 2g of curing agent, and rotating for 20min to uniformly disperse to obtain the magnetic slurry.
Filling a device cavity with the prepared magnetic slurry: the magnetic slurry is filled in the device cavity of the built-in coil through a scraping or pressing process, and baking treatment is carried out, wherein the baking treatment process specifically comprises the following steps: baking at 75deg.C for 25min, heating to 175 deg.C, baking for 120min, printing or spraying packaging ink, and cutting to obtain individual magnetic device as electronic component.
Table one: comparative Table of magnetic parameters of the magnetic devices prepared in examples 1-4 and commercial products
As can be seen from the above table, the magnetic device prepared in example 1 is superior to example 2 in that the surface resistance is slightly lower, but other properties are superior, which means that the activated carbonyl iron powder loses a part of the activity after being subjected to ultrasonic dispersion insulation treatment, and further means that the specific surface energy product of the powder under microscopic dimensions can be improved by performing the activation treatment on the surface of the powder, and more excellent magnetic properties can be exhibited.
As is clear from comparison of example 1 with example 3, example 1 shows that the magnetic properties are better than example 3, indicating that the addition of an appropriate inorganic filler can effectively improve the surface resistance and dielectric breakdown properties and contribute to reduction of Pcv loss.
As can be seen from a comparison of examples 1/2/3/4 with the commercial products, examples 1/2/3 after powder activation are superior to example 4 without powder activation, but examples 1/2/3/4 are superior to the commercial products in terms of their properties. Because the products on the market in the prior art are mixed by adopting resin, inorganic coating materials and powder, the powder cannot be ensured to be fully coated with the powder and the single resin coating have little difference, the current and voltage breakdown resistance is poor, and a layer of phosphating film is formed on the surface of the powder by phosphating, so that the film has poor magnetic properties and other properties.
By the embodiment, the powder can be more uniformly, compactly and compactly adhered to the powder particles through ultrasonic insulation and dispersion, the insulation of the particles in the true sense is realized, the thickness is controllable, and the better insulation effect can be realized even under the condition of high pressure of hot-press cold-press molding. The characteristic effect of the invention, which is beneficial to powder activation, can be more highlighted by the comparative example, and the characteristic of the product produced by powder phosphating is obviously better than that of the product produced in the market.
And (II) table: influence of screening with screens of different mesh numbers on magnetic properties
As can be seen from the above table two, in example 2, the mesh numbers of the screens after the activation treatment and drying were changed to 80 mesh, 100 mesh and 200 mesh, respectively, and the larger the mesh number, the smaller the powder particle size was, and as can be seen from the comparison of the above test data, the larger the particle size, the higher the inductance was, the lower the Q value, the higher the permeability was, and the higher the Pcv loss was. That is, the powder particle size is large, the magnetic permeability value is high, and the L value is large; otherwise, the powder has small granularity, low magnetic permeability value and small L value. The Pcv loss is mainly hysteresis loss and eddy current loss, and the eddy current loss is in direct proportion to the square of the frequency f, so that the eddy current loss is dominant in the total loss under the high-frequency condition, and therefore, the powder granularity is large, the eddy current loss is large, and the Q value is low; and on the contrary, the powder has small granularity, small eddy current loss and high Q value.
If the screen is selected under high frequency conditions, a 200-mesh screen with a relatively high Q value is selected, whereas if the screen is selected, a screen with a small mesh size is selected. Preferably, 200 mesh is used in this embodiment.
Table three: influence of mass fractions of different gas phase nano silicon dioxide on magnetic performance in ultrasonic dispersion treatment
As can be seen from the above table three, changing the mass fraction of fumed silica in the ultrasonic breaking dispersion also affects the performance of the magnetic device, as indicated by the above test data: as the mass fraction of the fumed silica is improved, the inductance L value is reduced, the Q value is increased, the Pcv loss is reduced, and the variation of the inductance L value, the Q value and the Pcv loss is obvious. The fumed silica is uniformly adhered on the surfaces of the powder particles to prevent the powder particles from contacting with each other, so that the eddy current loss is reduced, the insulation effect is enhanced, the Q value is increased, and the loss Pcv is reduced; and with the improvement of the mass fraction of the fumed silica, the pressure resistance is increased, so that the content of the fumed silica in the ultrasonic dispersion step can be regulated according to the requirement, the thickness attached to the powder is controlled, the insulation property is improved, the eddy current loss is reduced, and the pressure resistance is improved to find the optimal inductance and Q value.
The content of the binder (resin) affects the properties of the magnetic powder particles because the binder is more or less, which causes the distance between the powder particles to become larger or smaller, which affects the properties of the magnetic powder particles and which easily causes the coating to become uneven.
By combining the above examples, the best compounding ranges of the present invention were obtained by experiments as follows:
the mass ratio of the organic fluorine silicone resin to the epoxy modified silicone resin to the polyester flexible silicone resin is 1.5:1:1 to 5:3:2; the mass ratio of the organic resin to the sulfate to the glass powder is (1-5): (0.2-3): (0.1-2), the organic resin, sulfate and glass powder account for 5-60% of the total mass; the optimal solid content of the slurry is 82.5-98.6%. The activation solution is diluted by sulfuric acid in a solvent, and the solvent is one or more of ethanol and pure water: the mass fraction of the solvent is 0.1-10%, and the surfactant with the mass fraction of 0-5% is added.
In conclusion, the invention selects the fluorosilicone resin which has the advantages of increasing the surface energy through activating the magnetic powder, realizing more uniform and compact ultrasonic dispersion insulation treatment of the powder, realizing controllable thickness and voltage and current resistance, ensuring that the device achieves the best comprehensive performance, improving the magnetic characteristic parameters such as the saturation magnetic flux density, the magnetic permeability and the like, and simultaneously enhancing the current and voltage breakdown resistance.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. A method for preparing functional magnetic slurry, comprising the steps of:
step S1, weighing magnetic powder with preset quality;
s2, preprocessing the magnetic powder;
step S3, dissolving organic resin into colloid to obtain dissolved silicone resin, wherein the organic resin comprises organic fluorine silicone resin, modified epoxy silicone resin and flexible silicone resin;
step S4, directly and uniformly mixing the pretreated powder in the step S2 and the dissolved silicon resin obtained in the step S3, or uniformly mixing after adding sulfate and/or glass powder, and then adding a dispersing agent and a curing agent to obtain magnetic slurry;
in the step S2, the preprocessing of the magnetic powder includes:
diluting sulfuric acid in a solvent, stirring and dispersing uniformly, and adding a surfactant with the mass fraction of 0-5% to obtain an activated solution, wherein the solvent is one or more of ethanol and pure water, and the mass fraction of the solvent is 0.1-10%;
and mixing the magnetic powder with the activation solution, drying the mixed solution, and screening by a screen to obtain activated first powder.
2. The method for preparing a functional magnetic slurry according to claim 1, wherein in the step S2, the mixed solution is dried, and the method specifically comprises:
the drying temperature is 70 ℃, the drying time is 35min, and the drying time is 50-120 min after the temperature is raised to 120-125 ℃.
3. The method for preparing a functional magnetic slurry according to claim 1, wherein in the step S2, the magnetic powder is pretreated, further comprising:
carrying out ultrasonic dispersion insulation treatment on the magnetic powder, specifically, dispersing and dissolving gas-phase carbon dioxide and/or silicon carbide by ultrasonic, and uniformly attaching the surface of the non-activated magnetic powder; or alternatively
And (2) performing ultrasonic dispersion and dissolution on the gas-phase carbon dioxide and/or silicon carbide, and uniformly attaching the gas-phase carbon dioxide and/or the silicon carbide to the surface of the first powder after the activation treatment in the step (S2).
4. The method of producing a functional magnetic paste according to claim 1, wherein in said step S3, the mass ratio of said organic resin, said sulfate and said glass powder is (1 to 5): (0.2 to 3): (0.1 to 2);
the organic resin, the sulfate and the glass powder account for 1.5 to 60 percent of the total mass.
5. The method for preparing a functional magnetic slurry according to claim 1, wherein in the step S3, the mass ratio of the organic fluorosilicone resin to the modified epoxy silicone resin to the flexible silicone resin is 1.5:1:1 to 5:3:2.
6. The method of claim 1, wherein in the step S4, the solid content of the magnetic slurry is 68.5-98.6%.
7. The method for preparing the functional magnetic slurry according to claim 1, wherein the magnetic powder is one or a combination of a plurality of hydroxy iron powder, carbonyl iron powder and amorphous nanocrystalline iron powder;
the particle size of the magnetic powder is 0.9-5 um.
8. A magnetic device, characterized in that it is prepared by the preparation method of the functional magnetic slurry according to any one of claims 1 to 7, comprising:
the magnetic slurry is filled in a device cavity of a built-in coil through knife coating or pressing, then is baked and solidified, and then is printed or sprayed with an encapsulation layer, and finally, a single magnetic device is obtained through a cutting process.
9. A magnetic device according to claim 8, wherein the bake cure is performed at a cure temperature of 150 to 180 ℃ for a cure time of 120 to 270 minutes.
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