CN111063501B - Preparation method of low-loss powder for producing integrally-formed inductor - Google Patents
Preparation method of low-loss powder for producing integrally-formed inductor Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
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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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
Abstract
The invention discloses a preparation method of low-loss powder for producing an integrally formed inductor, which adopts mixed powder formed by mixing first powder, second powder and third powder, wherein the first powder is carbonyl iron powder, D50 is 6-7 microns and accounts for 20-40% by mass, the second powder is carbonyl iron powder, D50 is 3-4 microns and accounts for 30-40% by mass, the third powder is iron silicon powder or amorphous powder, and D50 is 10-15 microns and accounts for 30-40% by mass; after phosphating the mixed powder, adding a glue solution into the phosphated mixed powder, uniformly stirring to form slurry, granulating, drying in the air, baking at 90-120 ℃ for 1-2 hours, naturally cooling, adding zinc stearate accounting for 0.2-0.5% of the mass of the mixed powder, fully stirring uniformly, sieving, and taking 40-300-mesh particles to obtain the integrally-formed low-loss powder for the inductor; the powder prepared by the invention has high inductance value and low loss, and the integrally formed inductor processed by the powder has low loss and high efficiency.
Description
Technical Field
The invention belongs to the technical field of manufacturing of passive electronic components, and particularly relates to a preparation method of low-loss powder for producing integrally-formed inductors.
Background
At present, when the integrated electric induction is produced, the coil and the electrode terminal which are electrically connected are firstly placed in a production die, then the powder prepared from carbonyl iron powder, reduced iron powder, iron silicon aluminum powder, alloy powder, amorphous powder and the like is filled, and then the whole is formed by cold pressing, pressing and compacting through an upper punch and a lower punch, and then the integrated electric induction is cured at high temperature, so that the integrated electric induction machine has the advantages of strong anti-electromagnetic interference capability, small volume, large current, low power consumption and the like.
In order to meet the market demand of high efficiency, namely low loss, when the integrally formed inductor is used in the development of circuit technology, the industry has appeared that the density of the integrally formed inductor is improved by carrying out particle size grading on the same powder, thereby improving the magnetic permeability and reducing the loss, and has also appeared that the method for carrying out particle size grading on different powders and also is the method for improving the density of the integrally formed inductor, thereby improving the magnetic permeability and reducing the loss, for example, the Chinese patent application with the publication number of CN110310794A, namely, the integrally formed inductor made of the mixed soft magnetic material, adopts two or more than two kinds of soft magnetic powders with different sizes, and reaches the density maximization of the soft magnetic powder filled in the unit volume by mixing the soft magnetic powders required by the preparation, thereby leading the integrally formed power inductor made of the soft magnetic material made of the high-density mixed powder, the initial magnetic permeability is higher, the saturation characteristic is better, the product loss is lower, and the efficiency is higher.
However, these methods only aim at increasing the magnetic core density of the integrally formed inductor, and do not take other factors into comprehensive consideration, so the improvement effect is not ideal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation method of low-loss powder for producing an integrally formed inductor, which can not only improve the density of a magnetic core of the integrally formed inductor, but also improve the magnetostriction coefficient and the magnetic anisotropy coefficient of the magnetic core, thereby reducing the hysteresis loss of the magnetic core, finally reducing the loss of the integrally formed inductor as a whole and improving the efficiency.
The purpose of the invention is realized as follows: a method for preparing low-loss powder for producing integrally formed inductors comprises the following steps:
preparing mixed powder: the mixed powder is formed by mixing a first powder, a second powder and a third powder, wherein the first powder is carbonyl iron powder, D50 is 6-7 mu m and accounts for 20-40 mass percent, the second powder is carbonyl iron powder, D50 is 3-4 mu m and accounts for 30-40 mass percent, the third powder is iron silicon powder or amorphous powder, D50 is 10-15 mu m and accounts for 30-40 mass percent;
and (3) phosphating treatment: taking phosphoric acid according to 0.1-1.5% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, diluting the taken phosphoric acid with the taken acetone uniformly, adding the diluted phosphoric acid into the mixed powder, stirring uniformly, drying, baking at 60-80 ℃ for 1-2 hours, and finishing phosphating treatment;
preparing a glue solution: taking epoxy resin according to 1-3% of the mass of the mixed powder, taking organic silicon resin according to 1-3% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, sequentially dissolving the taken epoxy resin and the taken organic silicon resin in the taken acetone, and fully and uniformly dissolving to obtain a glue solution;
adding the glue solution into the mixed powder subjected to phosphating, stirring for 30-40 minutes to form slurry, granulating the slurry, drying, baking at 90-120 ℃ for 1-2 hours, naturally cooling, adding zinc stearate accounting for 0.2-0.5% of the mass of the mixed powder, fully stirring uniformly, sieving, and taking 40-300-mesh particles to obtain the integrally-formed low-loss powder for the inductor.
Preferably, the iron silicon powder is iron silicon 6.5 powder.
Preferably, the method further comprises the following steps:
preparing a special insulating treating agent solution: taking special insulating treatment agent according to 0.1-0.5% of the mass of the mixed powder, taking acetone according to 1-3% of the mass of the mixed powder, diluting the taken special insulating treatment agent with the taken acetone, and fully and uniformly stirring to obtain special insulating treatment agent solution.
More preferably, the special insulating treatment agent is a mixed solution prepared from 10-15% by mass of polybasic acid, 3-8% by mass of alkaline earth metal salt, 4-10% by mass of molybdate and the balance of acetone.
More preferably, the method further comprises the following steps:
preparing a film forming agent solution: taking a film forming agent accounting for 0.1-0.5% of the mixed powder in mass, taking acetone accounting for 1-3% of the mixed powder in mass, diluting and dissolving the taken film forming agent with the taken acetone, and fully and uniformly stirring to obtain a film forming agent solution, wherein the film forming agent is polyvinyl butyral.
Preferably, the glue solution is added into the phosphated mixed powder, the mixture is stirred for 30-40 minutes to form slurry, the special insulating treatment agent solution is added into the slurry, the film forming agent solution is continuously added after the mixture is stirred for 5-20 minutes, the slurry is granulated and dried after the mixture is stirred for 5-20 minutes, the mixture is baked at 90-120 ℃ for 1-2 hours, zinc stearate is added according to 0.2-0.5% of the mass of the mixed powder after the mixture is naturally cooled, the mixture is fully stirred uniformly and sieved, and particles of 40-300 meshes are taken to obtain the low-loss powder for integrally molded inductors.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the added second powder is carbonyl iron powder with small particle size, and the smaller the particle size is, more crystal boundaries can be provided, so that the structure can effectively improve the resistivity of the crystal boundaries and integrally reduce the eddy current loss of the magnet, thereby reducing the loss of integrally formed inductance and improving the efficiency;
(2) meanwhile, the third powder added in the invention is fine-grained iron-silicon powder or amorphous powder, and because the magnetocrystalline anisotropy constant and magnetostriction coefficient of the iron-silicon powder or the amorphous powder are small, the hysteresis loss of the magnetic core is reduced, the loss of the integrally formed inductor is reduced, and the efficiency is improved;
(3) the invention also reasonably matches the different grain diameters of the first powder, the second powder and the third powder, so that the filling magnet forms very high bulk density, and the integrally molded inductor can conveniently obtain higher molding density, thereby obtaining higher inductance value;
(4) the three technical means are integrated to obtain the powder with high inductance value and low loss, and the integrally formed inductor processed by the powder has low loss and high efficiency when in use, and has good development prospect.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments.
The invention provides a preparation method of low-loss powder for producing an integrally formed inductor, which comprises the following steps:
preparing mixed powder: the mixed powder is formed by mixing a first powder, a second powder and a third powder, wherein the first powder is carbonyl iron powder, D50 is 6-7 mu m and accounts for 20-40 mass percent, the second powder is carbonyl iron powder, D50 is 3-4 mu m and accounts for 30-40 mass percent, the third powder is iron silicon powder or amorphous powder, D50 is 10-15 mu m and accounts for 30-40 mass percent; wherein the iron silicon powder is iron silicon 6.5 powder;
and (3) phosphating treatment: taking phosphoric acid according to 0.1-1.5% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, diluting the taken phosphoric acid with the taken acetone uniformly, adding the diluted phosphoric acid into the mixed powder, stirring uniformly, drying, baking at 60-80 ℃ for 1-2 hours, and finishing phosphating treatment;
preparing a glue solution: taking epoxy resin according to 1-3% of the mass of the mixed powder, taking organic silicon resin according to 1-3% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, sequentially dissolving the taken epoxy resin and the taken organic silicon resin in the taken acetone, and fully and uniformly dissolving to obtain a glue solution;
adding the glue solution into the mixed powder subjected to phosphating treatment, stirring for 30-40 minutes to form slurry, granulating the slurry, drying, baking at 90-120 ℃ for 1-2 hours, naturally cooling, adding zinc stearate accounting for 0.2-0.5% of the mass of the mixed powder, fully stirring uniformly, sieving, taking 40-300-mesh particles, and obtaining the low-loss powder for producing the integrally formed inductor.
Specifically, the method can further comprise the following steps:
preparing a special insulating treating agent solution: taking special insulating treatment agent according to 0.1-0.5% of the mass of the mixed powder, taking acetone according to 1-3% of the mass of the mixed powder, diluting the taken special insulating treatment agent with the taken acetone, and fully and uniformly stirring to obtain special insulating treatment agent solution.
More preferably, the special insulating treatment agent is a mixed solution prepared from 10-15% by mass of polybasic acid, 3-8% by mass of alkaline earth metal salt, 4-10% by mass of molybdate and the balance of acetone.
More specifically, the method may further include the steps of:
preparing a film forming agent solution: taking a film forming agent accounting for 0.1-0.5% of the mixed powder in mass, taking acetone accounting for 1-3% of the mixed powder in mass, diluting and dissolving the taken film forming agent with the taken acetone, and fully and uniformly stirring to obtain a film forming agent solution, wherein the film forming agent is polyvinyl butyral.
On the basis of the step of adding, adding a glue solution into the mixed powder subjected to phosphating treatment, stirring for 30-40 minutes to obtain slurry, adding a special insulating treatment agent solution into the slurry, stirring for 5-20 minutes, then continuously adding a film forming agent solution, stirring for 5-20 minutes, then granulating the slurry, drying, baking at 90-120 ℃ for 1-2 hours, naturally cooling, adding zinc stearate according to 0.2-0.5% of the mass of the mixed powder, fully stirring uniformly, sieving, and taking 40-300-mesh particles to obtain the low-loss powder for producing the integrally-formed inductor.
The following are three sets of examples and comparative examples provided by the present invention.
The first embodiment is as follows:
preparing 1000g of mixed powder, wherein the first powder is carbonyl iron powder with the weight of D50=6.1um and 300g, the second powder is carbonyl iron powder with the weight of D50=3.1um and 350g, the third powder is iron silicon 6.5 powder with the weight of D50=10.2um and 350g, and uniformly mixing the three powders;
diluting 2g of phosphoric acid in 60g of acetone, adding the diluted phosphoric acid into 1000g of mixed powder after the diluted phosphoric acid is uniformly diluted, stirring the mixed powder uniformly, drying the mixed powder in the air, and baking the dried mixed powder for 2 hours at 60 ℃ to obtain the phosphatized mixed powder;
dissolving 12g of epoxy resin and 12g of organic silicon resin in 60g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphated mixed powder after uniform dissolution, stirring for 30 minutes to form slurry, granulating, drying, baking at 90 ℃ for 2 hours, naturally cooling, adding 2g of zinc stearate, uniformly stirring, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 27.9; under the condition of 100KHz/20mT, the magnetic core loss per unit volume is tested to be 492mW/cm3。
Comparative example one:
diluting 2g of phosphoric acid in 60g of acetone, adding the diluted phosphoric acid into 1000g of carbonyl iron powder with D50=6.3um after the diluted phosphoric acid is uniformly diluted, stirring the mixture uniformly, airing the mixture, and baking the mixture for 2 hours at 60 ℃ to obtain mixed powder with good phosphating treatment;
dissolving 12g of epoxy resin and 12g of organic silicon resin in 60g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphated mixed powder after uniform dissolution, stirring for 30 minutes to form slurry, granulating, drying, baking at 90 ℃ for 2 hours, naturally cooling, adding 2g of zinc stearate, uniformly stirring, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 25.6; the magnetic core loss per unit volume is measured to be 697mW/cm under the condition of 100KHz/20mT3。
Example two:
preparing 1000g of mixed powder, wherein the first powder is carbonyl iron powder with the weight of D50=6.3um, the second powder is carbonyl iron powder with the weight of D50=3.5um, the third powder is iron silicon 6.5 powder with the weight of D50=12.3um, and the third powder is 300g, and uniformly mixing the three powders;
diluting 3g of phosphoric acid in 80g of acetone, adding the diluted phosphoric acid into 1000g of mixed powder after the diluted phosphoric acid is uniformly diluted, stirring the mixed powder uniformly, drying the mixed powder in the air, and baking the dried mixed powder for 2 hours at 70 ℃ to obtain the mixed powder with good phosphating treatment;
dissolving 15g of epoxy resin and 15g of organic silicon resin in 80g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphated mixed powder after uniform dissolution, stirring for 35 minutes to form slurry, granulating, drying, baking at 90 ℃ for 2 hours, naturally cooling, adding 3g of zinc stearate, uniformly stirring, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 26.7; under the condition of 100KHz/20mT, the magnetic core loss per unit volume is tested to be 564mW/cm3。
Comparative example two:
diluting 3g of phosphoric acid in 80g of acetone, adding the diluted phosphoric acid into 1000g of carbonyl iron powder with D50=6.3um after the diluted phosphoric acid is uniformly diluted, stirring the mixture uniformly, airing the mixture, and baking the mixture for 2 hours at 70 ℃ to obtain mixed powder with good phosphating treatment;
dissolving 15g of epoxy resin and 15g of organic silicon resin in 80g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphated mixed powder after uniform dissolution, stirring for 35 minutes to form slurry, granulating, drying, baking at 90 ℃ for 2 hours, naturally cooling, adding 3g of zinc stearate, uniformly stirring, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 24.7; the magnetic core loss per unit volume is 776mW/cm under the condition of 100KHz/20mT3。
Example three:
preparing 1000g of mixed powder, wherein the first powder is carbonyl iron powder with the weight of D50=6.8um and 300g, the second powder is carbonyl iron powder with the weight of D50=3.9um and 350g, the third powder is ferrosilicon 6.5 powder with the weight of D50=14.6um and 350g, and uniformly mixing the three powders;
diluting 8g of phosphoric acid in 100g of acetone, adding the diluted phosphoric acid into 1000g of mixed powder after the diluted phosphoric acid is uniformly diluted, stirring the mixed powder uniformly, drying the mixed powder in the air, and baking the dried mixed powder for 1 hour at 80 ℃ to obtain the mixed powder with good phosphating treatment;
dissolving 25g of epoxy resin and 25g of organic silicon resin in 100g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphatized mixed powder after uniform dissolution, stirring for 40 minutes to form slurry, granulating, drying, baking at 120 ℃ for 1 hour, naturally cooling, adding 5g of zinc stearate, stirring uniformly, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 25.3; under the condition of 100KHz/20mT, the magnetic core loss per unit volume is 614mW/cm3。
Comparative example three:
diluting 8g of phosphoric acid in 100g of acetone, adding the diluted phosphoric acid into 1000g of carbonyl iron powder with D50=6.3um after the diluted phosphoric acid is uniformly diluted, stirring the mixture uniformly, airing the mixture, and baking the mixture for 1 hour at 80 ℃ to obtain mixed powder with good phosphating treatment;
dissolving 25g of epoxy resin and 25g of organic silicon resin in 100g of acetone in sequence, adding the dissolved epoxy resin and the dissolved organic silicon resin into the phosphatized mixed powder after uniform dissolution, stirring for 40 minutes to form slurry, granulating, drying, baking at 120 ℃ for 1 hour, naturally cooling, adding 5g of zinc stearate, stirring uniformly, and sieving to obtain 40-300-mesh granules as good products;
taking good product particles, pressing into 24 x 14 x 7 magnetic rings, forming under 26Mpa pressure, curing at 160 ℃ for 1 hour, and testing the magnetic conductivity to be 23.5; under the condition of 100KHz/20mT, the magnetic core loss per unit volume is tested to be 825mW/cm3。
As can be seen from the three groups of examples and comparative examples, the magnetic permeability can be improved and the magnetic core loss can be reduced by adopting three mixed powder materials with different particle sizes and a certain proportion.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and all the modifications or equivalent substitutions should be covered in the claims of the present invention.
Claims (2)
1. A method for preparing low-loss powder for producing integrally formed inductors is characterized by comprising the following steps:
preparing mixed powder: the mixed powder is formed by mixing a first powder, a second powder and a third powder, wherein the first powder is carbonyl iron powder, D50 is 6-7 mu m and accounts for 20-40 mass percent, the second powder is carbonyl iron powder, D50 is 3-4 mu m and accounts for 30-40 mass percent, the third powder is iron silicon powder or amorphous powder, D50 is 10-15 mu m and accounts for 30-40 mass percent;
and (3) phosphating treatment: taking phosphoric acid according to 0.1-1.5% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, diluting the taken phosphoric acid with the taken acetone uniformly, adding the diluted phosphoric acid into the mixed powder, stirring uniformly, drying, baking at 60-80 ℃ for 1-2 hours, and finishing phosphating treatment;
preparing a glue solution: taking epoxy resin according to 1-3% of the mass of the mixed powder, taking organic silicon resin according to 1-3% of the mass of the mixed powder, taking acetone according to 5-10% of the mass of the mixed powder, sequentially dissolving the taken epoxy resin and the taken organic silicon resin in the taken acetone, and fully and uniformly dissolving to obtain a glue solution;
preparing a special insulating treating agent solution: taking a special insulation treating agent according to 0.1-0.5% of the mass of the mixed powder, taking acetone according to 1-3% of the mass of the mixed powder, diluting the taken special insulation treating agent with the taken acetone, and fully and uniformly stirring to obtain a special insulation treating agent solution; the special insulating treating agent is a mixed solution prepared from polybasic acid, alkaline earth metal salt, molybdate and acetone, wherein the mass of the polybasic acid accounts for 10-15%, the mass of the alkaline earth metal salt accounts for 3-8%, the mass of the molybdate accounts for 4-10%, and the balance is acetone;
preparing a film forming agent solution: taking a film-forming agent according to 0.1-0.5% of the mass of the mixed powder, taking acetone according to 1-3% of the mass of the mixed powder, diluting and dissolving the taken film-forming agent with the taken acetone, and fully and uniformly stirring to obtain a film-forming agent solution, wherein the film-forming agent is polyvinyl butyral;
adding a glue solution into the mixed powder subjected to phosphating treatment, stirring for 30-40 minutes to obtain slurry, adding a special insulating treatment agent solution into the slurry, stirring for 5-20 minutes, then continuously adding a film forming agent solution, stirring for 5-20 minutes, then granulating the slurry, drying, baking at 90-120 ℃ for 1-2 hours, naturally cooling, adding zinc stearate according to 0.2-0.5% of the mass of the mixed powder, fully stirring uniformly, sieving, and taking 40-300-mesh particles to obtain the low-loss powder for producing the integrally formed inductor.
2. The method according to claim 1, wherein the step of preparing the low-loss powder for the integrally formed inductor comprises: the iron silicon powder is iron silicon 6.5 powder.
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| CN111876762A (en) * | 2020-07-24 | 2020-11-03 | 广东创芯电子有限公司 | Iron powder phosphating process for production of chip inductor |
| CN114628137B (en) * | 2022-02-10 | 2023-05-12 | 湖南航天磁电有限责任公司 | Insulation coating method of soft magnetic powder |
| CN114255952B (en) * | 2022-03-02 | 2022-05-17 | 天通控股股份有限公司 | Low-loss powder for integrally formed inductor and preparation method thereof |
| CN114582580B (en) * | 2022-05-06 | 2022-07-29 | 天通控股股份有限公司 | Soft magnetic metal powder and preparation method thereof |
| CN116092812B (en) * | 2022-12-12 | 2023-08-11 | 北京七星飞行电子有限公司 | Preparation method of carbonyl iron powder soft magnetic core for hundred MHz high frequency |
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