CN111151740A - Manufacturing method of integrally formed inductor - Google Patents
Manufacturing method of integrally formed inductor Download PDFInfo
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- CN111151740A CN111151740A CN202010070192.9A CN202010070192A CN111151740A CN 111151740 A CN111151740 A CN 111151740A CN 202010070192 A CN202010070192 A CN 202010070192A CN 111151740 A CN111151740 A CN 111151740A
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Classifications
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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
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- 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
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F1/16—Metallic particles coated with a non-metal
-
- 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
Abstract
The invention discloses a method for manufacturing an integrally formed inductor, which comprises the following steps: coil presetting: placing the prefabricated hollow coil into a mold cavity of an injection mold or placing the prefabricated hollow coil into a soft magnetic core, and then placing the soft magnetic core into the mold cavity of the injection mold; mixing and granulating: mixing and granulating soft magnetic powder and a binder to obtain soft magnetic composite particles, wherein the average Wolter sphericity of the soft magnetic powder is 75-100%, preferably 80-100%, and more preferably 85-100%; injection molding: and carrying out hot melting on the soft magnetic composite particles by injection molding equipment to form a soft magnetic composite material, and injecting the soft magnetic composite material into the mold cavity of the mold to obtain the integrally molded inductor.
Description
Technical Field
The invention relates to the field of manufacturing of inductors, in particular to a method for manufacturing an integrally formed inductor.
Background
Most of the integrally formed inductors sold in the market at present are prepared by a powder metallurgy process and are molded by metal powder, so the integrally formed inductors are also called as molded inductors, and the specific manufacturing process is as follows: firstly, placing a prefabricated hollow coil in a mold cavity, then adding metal powder subjected to insulation coating treatment, then pressing and molding, and finally performing low-temperature heat curing treatment to obtain the integrally molded inductor. Although the powder metallurgy process is relatively simple compared to other processes, it also has a number of technical problems:
1. in the pressing process, the metal powder is easy to damage the insulating layer of the hollow coil, short circuit is generated, potential safety hazards exist, and therefore pressing can be carried out only by using relatively low pressure. The low-voltage pressing can cause the density of the magnetic material in the inductor to be low, so that the inherent characteristics of the material cannot be fully embodied, and finally the comprehensive performance of the inductor is poor;
2. because the hollow coil can lead to the hollow coil to produce certain elastic change during the suppression in the inside of metal powder, causes layering between hollow coil and the magnetic, in order to solve this technical problem, mainly solve through following two methods: (1) the method adopts irregular metal powder with irregular particle shape, wherein the particles of the irregular metal powder are easy to be mutually engaged in the pressing process so as to be convenient for forming, and (2) small-particle metal powder is adopted, the metal powder with small particles is easy to be formed and not layered compared with large particles, generally D50 is below 30 mu m, carbon-based iron powder is frequently adopted in the market, the particles of the iron-silicon-chromium alloy powder are very small, generally D50 is about 5 mu m, and also irregular iron-silicon-chromium alloy powder with D50 being about 25 mu m is adopted. For magnetic materials, if a metal powder having a spherical or spheroidal particle morphology and an alloy powder can be used, the overall performance is far better than that of the irregular metal powder, but the formability of the spherical or spheroidal alloy powder is much worse than that of the irregular alloy powder. Because the spherical or sphere-like alloy powder particles are difficult to form, the integrally formed inductors pressed by the alloy powder dry powder all adopt the alloy powder with fine particle diameter and irregular particle appearance. Recently, a new report is reported, the performance of products is improved by adding a small amount of spherical or spheroidal particle alloy metal powder dry powder pressed integral forming inductor into carbon-based iron powder, and the improvement of the comprehensive performance of the inductor is limited due to the higher proportion of pure iron powder;
3. the powder metallurgy process can only be applied to a low-power inductor generally, and a high-power integrally-formed inductor cannot be prepared, so that the requirement of the market on a medium-large inductor cannot be met.
In recent years, new fluid filling processes and methods have been proposed for the technical problems of the integrally formed inductor prepared by the powder metallurgy process, for example, patent CN101552091B discloses a metal powder injection molding inductor and its processing method, patent CN10486760B discloses a high-density novel magnetic composite material for inductor, patent CN105741997B discloses an injection molding plastic and soft magnetic powder composite material and its preparation method, and patent CN107778847A discloses an integrally injection molding soft magnetic composite material for inductor and its preparation method. Although many techniques related to fluid filling processes are proposed in the patent literature, no similar products are yet available on the market, and the current market is mainly for molded inductors formed by dry powder molding by using powder metallurgy process technology. For this reason, the prior art fluid filling process mainly has the following technical problems:
1. the fluid filling process disclosed in the patent mostly adopts an injection molding process, the existing injection molding process does not limit the shape of the soft magnetic powder, and just because the integrally molded inductor produced at present mostly adopts a powder metallurgy process, the irregular metal powder is often adopted for the convenience of molding, and because of inertial thinking, the existing injection molding process also often adopts the soft magnetic powder, and the flowability of the irregular soft magnetic powder is poor, so that more binders are often required to be added for meeting the requirements of the injection process;
2. in order to increase the flowability in injection molding, very small particles of metal powder materials are used, generally below 30 μm. Theoretically, a single small particle metal powder will flow better than a large particle metal powder. However, when a plurality of metal powders are tightly combined together, the smaller the metal powder particles, the larger the specific surface area thereof, and the smaller the loose packing ratio, so that more binder needs to be added to satisfy the requirement of fluidity thereof.
When too much binder is added to the soft magnetic powder, the resulting product will have a low magnetic material density. Although the patent disclosed also discloses a soft magnetic composite material having a high density by injection process, in practice, the binder content is high, which results in a high non-magnetic material content, and even if the soft magnetic composite material is made to have a high density, the magnetic material content actually effective in the same volume is low, which results in poor practical properties of the product.
In summary, the above technical problems explain why the injection molding process disclosed in the prior art has not replaced the conventional powder metallurgy process, and the present invention is directed to improving the prior injection molding process so that it can be really applied to the actual production of the integrally molded inductor based on the technical problems of the injection molding process disclosed in the prior art.
Disclosure of Invention
The invention discloses a method for manufacturing an integrally formed inductor, which comprises the following steps:
coil presetting: placing the prefabricated hollow coil into a mold cavity of an injection mold or placing the prefabricated hollow coil into a soft magnetic core, and then placing the soft magnetic core into the mold cavity of the injection mold;
mixing and granulating: mixing and granulating soft magnetic powder and a binder to obtain soft magnetic composite particles, wherein the average Wolter sphericity of the soft magnetic powder is 75-100%, preferably 80-100%, and more preferably 85-100%;
injection molding: and carrying out hot melting on the soft magnetic composite particles by injection molding equipment to form a soft magnetic composite material, and injecting the soft magnetic composite material into the mold cavity of the mold to obtain the integrally molded inductor.
The soft magnetic powder having a high average Wolter sphericity generates a small friction force when flowing, and has a small specific surface area and a large apparent density. Therefore, the injection molding process using the soft magnetic powder having a high average wodel sphericity requires less binder than the injection molding process using the soft magnetic powder having a low average wodel sphericity under the same fluidity, and the inductor manufactured by the injection molding process using the soft magnetic powder having a high average wodel sphericity has a higher density of the soft magnetic composite material, a larger magnetic material ratio, and a better effect when the fluidity required for the injection molding process is actually satisfied.
Preferably, the soft magnetic powder and the binder in the mixing and granulating step are as follows in parts by weight:
soft magnetic powder: 85-98 parts, preferably 90-96 parts, and more preferably 91-94 parts;
adhesive: 2 to 15 parts, preferably 4 to 10 parts, and more preferably 6 to 9 parts.
Preferably, at least a portion of the soft magnetic powder is a first type of particles having an average Waidel sphericity of 80% to 100%, preferably 85% to 100%, more preferably 90% to 100%, which is 5% to 100% by weight of the soft magnetic powder. The soft magnetic powder having a higher average wodel sphericity generates less friction when flowing, and has a smaller specific surface area and a larger apparent density. Therefore, under the condition of the same fluidity, the inductor prepared by using the soft magnetic powder with a part of the first type of spherical or spheroidal particles needs less adhesive, and when the fluidity required by the fluid filling process is actually met, the inductor prepared by using the soft magnetic powder with at least a part of the first type of spherical or spheroidal particles has higher density of the soft magnetic composite material, larger proportion of the magnetic material and better effect.
Preferably, D of said first type of particles5050 to 110 μm, preferably 70 to 110 μm, more preferably D50Is 90 to 110 μm. In unit volume, the larger the soft magnetic powder particles are, the smaller the specific surface area is, and the larger the loose packing ratio is, so that the soft magnetic composite material of which one part is first type of large particle spherical or sphere-like soft magnetic powder can meet the requirement of flowability of the injection molding process by needing less adhesive to wrap the soft magnetic powder particles.
Preferably, a further part of said soft magnetic powder is particles of a second type, said particles of a second type D505 to 40 μm, preferably 5 to 20 μm, and more preferably 5 to 10 μm. The soft magnetic powder of smaller particles can fill the gaps between the soft magnetic powders of larger particles, and the inductor prepared by using the soft magnetic powder is softThe magnetic composite material has higher density, larger magnetic material proportion and better effect.
Preferably, the second type of particles have an average wodel sphericity of from 80% to 100%, preferably from 85% to 100%, more preferably from 90% to 100%. When the smaller soft magnetic powder particles filling the gaps among the larger soft magnetic powder particles are spherical or spheroidal, the soft magnetic composite material has better flowability, and when the flowability required by the injection molding process is met, the soft magnetic composite material of the inductor prepared from the soft magnetic powder has higher density, larger magnetic material proportion and better effect.
Preferably, the weight part ratio of the second type of particles to the first type of particles is 5-30 parts: 70-95 parts, preferably 7-25 parts: 75-93 parts, more preferably 10-20 parts: 80-90 parts. When the soft magnetic powder with smaller particles filling the gaps among the soft magnetic powder with larger particles is in a proper proportion, the soft magnetic powder can just fill the gaps among the soft magnetic powder with larger particles.
Preferably, the soft magnetic powder is subjected to insulation coating treatment, 0.1-2 parts of surface insulating agent is used for carrying out insulation coating treatment on 85-98 parts, preferably 90-96 parts, more preferably 91-94 parts of soft magnetic powder, and then the soft magnetic powder is fully mixed with 2-15 parts, preferably 4-10 parts, more preferably 6-9 parts of binder for granulation to obtain soft magnetic composite particles.
Preferably, the soft magnetic powder is a metal powder, preferably an alloy powder.
Preferably, the soft magnetic powder is one or more of iron powder, iron-silicon-aluminum alloy powder, iron-silicon-chromium alloy powder, iron-silicon-nickel alloy powder, iron-silicon-aluminum-nickel alloy powder, iron-nickel-molybdenum alloy powder, amorphous powder and nanocrystalline powder.
Preferably, the binder is a resin, preferably a thermoplastic resin.
Preferably, the binder is one or more of epoxy resin, phenolic resin, polycarbonate PC, polyamide PA, polyhexamethylene terephthalamide PA6T, polyformaldehyde POM, polyphenylene oxide PPO, polyphenylene ether PPE, polyethylene terephthalate PET, polybutylene terephthalate PBT, polyphenylene sulfide PPS, liquid crystal polymer LCP, polyimide PI, polysulfone PSF, aluminum polysulphide PAS, polyether sulfone resin PES, para-aromatic polyamide fiber PPTA and polyether ether ketone PEEK.
Preferably, the surface insulating agent is one or more of phosphoric acid, chromic acid, aluminum phosphate, nano-silica and sodium silicate.
Preferably, the soft magnetic core is one or more of a ferrite core, an iron powder core, a sendust core, a ferrosilicon nickel core, a ferrosilicon chromium core, a ferronickel molybdenum core, a silicon steel sheet core, an amorphous core and a nanocrystalline core.
The invention has the advantages that the injection molding process using the soft magnetic powder with higher average Wolter sphericity is provided, and in order to achieve better technical effect, the soft magnetic composite material used for the injection molding process has better fluidity by filling the soft magnetic powder with smaller particles in the soft magnetic powder with larger particles, so that when the fluidity required by the injection molding process is actually met, the soft magnetic composite material of the inductor prepared by using the soft magnetic powder has higher density, larger magnetic material proportion and better effect.
Drawings
FIG. 1 scanning electron microscope image of soft magnetic powder used in the conventional injection molding process of control group 1
FIG. 2 scanning electron microscope image of group 6 large particle spherical or quasi-spherical soft magnetic powder
FIG. 3 scanning electron microscope image of group 8 larger particle spherical or spheroidal soft magnetic powder with addition of smaller particle spherical or spheroidal soft magnetic powder
FIG. 4 scanning Electron microscope photograph of group 11 Large particle spherical or spheroidal Soft magnetic powder with addition of Soft magnetic powder of powder having relatively large particles and relatively poor sphericity
Detailed Description
Various aspects of the present invention will be described in detail below, but the present invention is not limited to these specific embodiments. Modifications and adaptations of the present invention that come within the spirit of the following disclosure may be made by those skilled in the art and are within the scope of the present invention.
The inventors have extensively and intensively studied to develop a soft magnetic composite material for injection molding process, which has good fluidity, so that the soft magnetic composite material for injection molding process has higher density, larger magnetic material ratio and better effect of the prepared inductor when satisfying the fluidity required by the injection molding process.
The inventors first compared specific surface areas and apparent densities of different kinds of soft magnetic powders obtained by purchasing them on the market or obtained another kind of soft magnetic powder by mixing two kinds of soft magnetic powders. . Then, the inventors prepared soft magnetic composite materials by adding the same amount of binder to the same amount of the above different kinds of soft magnetic powder, respectively, and compared the flow lengths of the different kinds of soft magnetic composite materials. Finally, the inventor determines the experimental conditions of the optimal soft magnetic composite material according to the experimental data, on the basis, the inventor selects an injection molding process to manufacture the inductor, the inductor is prepared by the experimental conditions of the optimal soft magnetic composite material determined by the invention and the experimental conditions of the soft magnetic composite material in the existing injection molding process, the fluidity of the soft magnetic composite material in the same process is kept consistent, the equipment conditions are kept consistent, and the density of the outer magnet, the proportion of the magnetic material and the initial permeability of the outer magnet are respectively measured and compared.
Comparison of Soft magnetic powder Properties
The soft magnetic powder in the prior art is made of iron powder, iron-silicon-aluminum alloy powder, iron-silicon-chromium alloy powder, iron-silicon-nickel alloy powder, iron-silicon-aluminum-nickel alloy powder, iron-nickel-molybdenum alloy powder, amorphous powder and nanocrystalline powder, and the inventor selects the iron-silicon-chromium alloy powder commonly used in the prior art and uses irregular iron-silicon-chromium alloy powder with the average Wold sphericity of 65.5 percent in the prior injection molding processGold powder was used as a control group, and the specific surface area and the apparent density of a spherical or spheroidal iron-silicon-chromium alloy powder having an average Wolter sphericity of 75.2%, 82.1% or 94.1% were measured for the experimental iron-silicon-chromium alloy powder group having a median particle diameter D50Are all smaller particles commonly used in existing fluid filling processes, D50About 17 μm.
TABLE 1 comparison of the properties of different average Watel sphericity Fe-Si-Cr alloy powders
| Group of | Average Wodel sphericity (%) | Median particle diameter D50(μm) | Specific surface area (square meter/g) | Bulk density (g/cc) |
| Control group 1 | 65.5 | 17.2 | 0.674 | 3.20 |
| Group 1 | 75.2 | 17.4 | 0.546 | 3.31 |
| Group 2 | 82.1 | 17.1 | 0.383 | 3.36 |
| Group 3 | 94.1 | 16.8 | 0.060 | 3.59 |
From Table 1, it can be seen from the experimental results that in D50Under the condition of keeping unchanged, the higher the average Wolter sphericity of the soft magnetic powder, the smaller the specific surface area of the soft magnetic powder, and the larger the apparent density, so that less binder is needed to wrap the soft magnetic powder particles to meet the requirement of the fluidity of the soft magnetic composite material.
Then, the inventors worked as D50The iron-silicon-chromium alloy powder of 5.8 μm was used as a control group, and D was measured50The specific surface area and apparent density of the larger-grained spherical or spheroidal ferrosilicon-chromium alloy powders of 16.8 μm, 50.0 μm, 80.7 μm and 109.2 μm, the average Wold sphericity of the experimental ferrosilicon-chromium alloy powders in this group is about 94% of the average Wold sphericity which is the most effective in the above group of experiments.
Table 2 shows the different median particle diameters D50Comparison of the properties of iron-silicon-chromium alloy powders
| Group of | Average Wodel sphericity (%) | Median particle diameter D50(μm) | Specific surface area (square meter/g) | Bulk density (g/cc) |
| Control group 2 | 94.5 | 5.8 | 0.151 | 2.96 |
| Group 3 | 94.1 | 16.8 | 0.060 | 3.59 |
| Group 4 | 94.5 | 50.0 | 0.032 | 4.21 |
| Group 5 | 93.8 | 80.7 | 0.015 | 4.30 |
| Group 6 | 93.7 | 109.2 | 0.011 | 4.33 |
From Table 2, it can be seen from the experimental results that the soft magnetic powder D had an average Wolter sphericity of about 94% in all of the soft magnetic powders50The larger the specific surface area of the soft magnetic powder is, the larger the apparent density is, so that less binder is required to wrap the soft magnetic powder particles to meet the requirement of fluidity of the soft magnetic composite material, and under the condition of the same fluidity, the soft magnetic composite material contains the soft magnetic powder D50The larger the density of the soft magnetic composite material, the larger the magnetic material fraction.
Then, the inventor has used the most effective group 6 in the above experiments as a control group, mixed the soft magnetic powder of group 6 in different parts and the soft magnetic powder of control group 2 in different parts, prepared by adding the spherical or spheroidal powder of smaller particles to the spherical or spheroidal soft magnetic powder of larger particles, and measured the specific surface area and loose packed density thereof.
Table 3 shows the property comparison of Fe-Si-Cr alloy powders with the same composition and different proportions
| Group of | Group 6 parts | Control group 2 parts | Specific surface area (square meter/g) | Bulk density (g/cc) |
| Group 6 | 100 | 0 | 0.011 | 4.33 |
| Group 7 | 95 | 5 | 0.012 | 4.48 |
| Group 8 | 90 | 10 | 0.013 | 4.53 |
| Group 9 | 80 | 20 | 0.016 | 4.49 |
| Group 10 | 70 | 30 | 0.031 | 4.42 |
According to table 3, it can be seen from the experimental results that a small amount of the smaller-particle spherical or spheroidal soft magnetic powder is added into the larger-particle spherical or spheroidal soft magnetic powder, so that the specific surface area of the soft magnetic powder is not changed greatly, and the loose packing density is increased, and the smaller-particle spherical or spheroidal soft magnetic powder fills the gaps of the larger-particle spherical or spheroidal soft magnetic powder, so that the prepared soft magnetic composite material has higher density and higher magnetic material ratio.
Finally, the inventor regards group 8, which has the best effect in the above experiments, as a control group, and changes 10 parts of group 2 soft magnetic powder in group 8 to the same parts of group 1 soft magnetic powder, prepares a powder having relatively large particles and relatively poor sphericity added to a large-particle spherical or spheroidal soft magnetic powder, and determines the specific surface area and bulk density thereof.
Table 4 shows the property comparison of Fe-Si-Cr alloy powders with different compositions and the same ratio
| Group of | Group 6 parts | Control group 2 parts | 1 part of group | Specific surface area (square meter/g) | Bulk density (g/cc) |
| Group 8 | 90 | 10 | - | 0.013 | 4.53 |
| Group 11 | 90 | - | 10 | 0.038 | 4.40 |
From table 4, it can be seen from the experimental results that when D50 of the smaller-grained spherical or spheroidal soft magnetic powder added to the larger-grained spherical or spheroidal soft magnetic powder becomes larger and the average waddel sphericity becomes lower, the specific surface area of the soft magnetic powder is significantly increased and the apparent bulk density is slightly decreased, but it still has great advantages over the specific surface area and apparent bulk density of the control 1 used in the existing injection molding process.
The soft magnetic powder of control group 1 was shown in fig. 1 under a scanning electron microscope, the soft magnetic powder of group 6 was shown in fig. 2 under a scanning electron microscope, the soft magnetic powder of group 8 was shown in fig. 3 under a scanning electron microscope, and the soft magnetic powder of group 11 was shown in fig. 4 under a scanning electron microscope.
Average waddel sphericity measurement method: taking 20g of sample powder, directly dispersing the powder on a sample testing glass plate by adopting a vacuum dispersion method, and then measuring the powder by a variable focus microscopic imaging scanning technology; the testing instrument is an Ougeno OCCHIO-500 nano image method particle morphology analyzer.
Specific surface area measurement method: vacuum volume method, taking 10g of sample powder and putting into a test tube for measurement; testing an instrument: NOVATOUCH specific surface area and pore size analyzer.
The loose density measuring method comprises the following steps: measuring by a funnel method, taking 50g of soft magnetic powder, uniformly pouring the soft magnetic powder into a container through a funnel, scraping part of the powder higher than the opening of the container by using a blade, weighing the weight of the powder after the powder is filled, and calculating the weight of the powder in unit volume; the measuring instrument is as follows: fluidity apparent density testing arrangement.
Comparison of the flowability of Soft magnetic composites
The prior art adhesives include epoxy resin, phenolic resin, polycarbonate PC, polyamide PA, polyhexamethylene terephthalamide PA6T, polyoxymethylene POM, polyphenylene oxide PPO, polyphenylene ether PPE, polyethylene terephthalate PET, polybutylene terephthalate PBT, polyphenylene sulfide PPS, liquid crystal polymer LCP, polyimide PI, polysulfone PSF, aluminum polysulphide PAS, polyether sulfone resin PES, para-aramid fiber PPTA, and polyether ether ketone PEEK. The inventors selected PA6T, which is commonly used among them, as a binder, prepared a soft magnetic composite material by taking 9.0kg of the above-mentioned respective groups of soft magnetic powder and adding 1.0kg of the binder, and then tested the fluidity of the soft magnetic composite material in terms of flow length.
TABLE 5 comparison of the flow lengths of different groups of soft magnetic composites
| Group of | Flow length (cm) |
| Control group 1 | 17.8 |
| Group 1 | 18.6 |
| Group 2 | 19.4 |
| Group 3 | 37.5 |
| Control group 2 | 37.7 |
| Group 4 | 38.2 |
| Group 5 | 38.9 |
| Group 6 | 39.3 |
| Group 7 | 39.0 |
| Group 8 | 39.2 |
| Group 9 | 39.0 |
| Group 10 | 38.0 |
| Group 11 | 37.7 |
From tables 1, 2, 3, 4, 5, it can be seen from the experimental results that the flow length of the soft magnetic composite material is inversely related to the specific surface area of the soft magnetic powder and is positively related to the apparent density of the soft magnetic powder, and the smaller the specific surface area of the soft magnetic powder, the greater the apparent density, and the better the flowability of the soft magnetic composite material prepared therefrom. Thus, group 8 is the best type of soft magnetic powder with the highest average Wolter sphericity and larger particles D50At maximum, and 10 parts of a spherical or spheroidal soft magnetic powder of smaller particles is added to 90 parts of a soft magnetic powder of larger particles.
Flow length test method: the fluidity of the soft magnetic composite material is determined by adopting the flow length under a certain injection molding condition, the soft magnetic composite material is mixed and granulated by a double screw extruder to prepare soft magnetic composite particles, 1.0kg of the soft magnetic composite particles are added into a charging barrel of injection equipment, the temperature of the charging barrel is set to be 330 ℃, the prefabricated soft magnetic composite particles are melted into fluid feed, the fluid feed is injected into a die cavity by rotating a screw, the injection time is 1s, then the length of a sample is measured, the longer the length of the sample is, the better the fluidity is, and the parameters of the injection equipment are determined; the mold temperature is 120 ℃, the injection pressure is 9Mpa, and the injection speed is 70 mm/s; size of die cavity: the width is 10mm, and the thickness is 2 mm.
The inventors carried out the following examples based on the optimum experimental conditions.
Examples
Comparative example 1
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; taking 8.7kg of iron-silicon-chromium alloy powder, wherein the average Wolter sphericity of the iron-silicon-chromium alloy powder is 68.5 percent, and the median diameter D is50The surface of the iron-silicon-chromium alloy powder is subjected to insulation coating treatment by phosphoric acid, wherein the thickness of the iron-silicon-chromium alloy powder is 45.2 micrometers; then 1.3kg of PA6T material is selected to be mixed with the pretreated iron-silicon-chromium alloy powder to prepare a soft magnetic composite material, and the soft magnetic composite material is mixed and granulated by a double-screw extruder to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; injecting the prepared soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled, wherein the flow length of the soft magnetic composite material is 26.2cm, so that the soft magnetic composite material is filled outside a coil and a magnetic core, forming a layer of outer magnet after the injected soft magnetic composite material is solidified, demolding to obtain the integrally molded inductor, the density of the outer magnet material of the inductor can reach 4.32g/cc, the ratio of the magnetic material is 87%, the initial magnetic permeability of the outer magnet reaches 9.9 mu, the number of turns of the coil of the inductor is 16, the length le of an effective magnetic path is 6.39cm, and the area Ae of the effective magnetic core is 1.198cm2The inductance L @0A at 0A was 17.9. mu.H, the inductance L @15A at 15A was 17.5. mu.H, the inductance L @30A at 30A was 16.5. mu.H, and the inductance L @45A at 45A was 15.0. mu.H.
Example 1
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; taking 9.2kg of iron-silicon-chromium alloy powder, wherein the iron-silicon-chromium alloy powder comprises 90 parts of alloy with the average Wolter sphericity of 94.0 percent and the median particle diameter D50109.2 μm Fe-Si-Cr alloy powder and 10 parts of an average Wodel sphericity of 94.5% and a median particle diameter D50Is composed of 5.8 mu m iron-silicon-chromium alloy powder, and the surface of the iron-silicon-chromium alloy powder is subjected to insulation coating treatment by phosphoric acid; selecting 0.8kg of PA6T material, mixing the material with the pretreated iron-silicon-chromium alloy powder to prepare a soft magnetic composite material, and extruding the soft magnetic composite material by a double screwTaking out the powder particles, mixing and granulating to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; injecting the prepared soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled, wherein the flow length of the soft magnetic composite material is 26.1cm, so that the coil and the magnetic core are filled with the soft magnetic composite material, forming a layer of outer magnet after the injected soft magnetic composite material is cured, and demolding to obtain the integrally molded inductor, wherein the density of the outer magnet material of the inductor can reach 5.59g/cc, the occupation ratio of the magnetic material reaches 92%, and the initial magnetic permeability of the outer magnet reaches 21.1 mu; the number of turns of the inductor coil is 16, the effective magnetic path length le is 6.39cm, and the effective magnetic core area Ae is 1.198cm2The inductance L @0A at 0A was 24.1. mu.H, the inductance L @15A at 15A was 23.6. mu.H, the inductance L @30A at 30A was 22.1. mu.H, and the inductance L @45A at 45A was 19.7. mu.H.
Table 6 is a comparison of the properties of the external magnet and the inductor prepared in comparative example 1 and example 1
As shown in table 6, compared with the inductor prepared from the soft magnetic composite material in comparative example 1 in the prior art, the inductor prepared from the soft magnetic composite material provided in example 1 of the present invention has the advantages of higher density of the external magnetic material, larger magnetic material ratio, significantly increased initial magnetic permeability of the external magnetic material, and significantly increased inductance.
Comparative example 2
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; 8.7kg of ferrosilicon aluminum alloy powder having an average Wolter sphericity of 63.3% and a median particle diameter D50The surface of the iron-silicon-aluminum alloy powder is subjected to insulation coating treatment by phosphoric acid, wherein the thickness of the iron-silicon-aluminum alloy powder is 50.8 mu m; then 1.3kg of PA6T material is selected to be mixed with the pretreated iron-silicon-aluminum alloy powder to prepare a soft magnetic composite material, and the soft magnetic composite material is mixed and granulated by a double-screw extruder to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; will make intoInjecting the obtained soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled with the soft magnetic composite material, wherein the flow length of the soft magnetic composite material is 25.9cm, so that the coil and the magnetic core are filled with the soft magnetic composite material, forming a layer of outer magnet after the injected soft magnetic composite material is cured, and demolding to obtain the integrally molded inductor, wherein the density of the outer magnet material of the inductor can reach 4.21g/cc, the proportion of the magnetic material reaches 87%, and the initial magnetic permeability of the outer magnet reaches 10.4 mu; the number of turns of the inductor coil is 16, the effective magnetic path length le is 6.39cm, and the effective magnetic core area Ae is 1.198cm2The inductance L @0A at 0A was 18.0. mu.H, the inductance L @15A at 15A was 16.4. mu.H, the inductance L @30A at 30A was 14.0. mu.H, and the inductance L @45A at 45A was 11.5. mu.H.
Example 2
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; taking 9.2kg of ferrosilicon aluminum alloy powder, wherein the ferrosilicon aluminum alloy powder consists of 90 parts of ferrosilicon aluminum alloy powder with the average Widel sphericity of 90.2 percent and the median diameter D50103.6 μm ferrosilicon aluminium alloy powder and 10 parts of an average Wodel sphericity of 91.4% and a median particle diameter D505.2 mu m of iron-silicon-aluminum alloy powder, and performing insulation coating treatment on the surface of the iron-silicon-aluminum alloy powder by using phosphoric acid; then 0.8kg of PA6T material is selected to be mixed with the pretreated iron-silicon-aluminum alloy powder to prepare a soft magnetic composite material, and the soft magnetic composite material is mixed and granulated by a double-screw extruder to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; injecting the prepared soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled, wherein the flow length of the soft magnetic composite material is 26.3cm, so that the soft magnetic composite material is filled outside the coil and the magnetic core, forming a layer of outer magnet after the injected soft magnetic composite material is cured, and demolding to obtain the integrally molded inductor, wherein the density of the outer magnet material of the inductor can reach 5.32g/cc, the occupation ratio of the magnetic material reaches 92%, and the initial magnetic permeability of the outer magnet reaches 21.6 mu; the number of turns of the inductor coil is 16, the effective magnetic path length le is 6.39cm, and the effective magnetic core area Ae is 1.198cm2The inductance L @0A at a current of 0A is24.2 muH, inductance L @15A at 15A was 21.4 muH, inductance L @30A at 30A was 16.6 muH, and inductance L @45A at 45A was 13.7 muH.
Table 7 is a comparison of the properties of the outer magnet and the inductor prepared in comparative example 2 and example 2
As shown in table 7, compared with the inductor prepared from the soft magnetic composite material in comparative example 2 in the prior art, the inductor prepared from the soft magnetic composite material provided in example 2 of the present invention has the advantages of higher density of the external magnetic material, larger magnetic material ratio, significantly increased initial magnetic permeability of the external magnetic material, and significantly increased inductance.
Comparative example 3
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; 8.7kg of an iron-silicon-nickel alloy powder having an average Wolter sphericity of 69.2% and a median particle diameter D50The surface of the iron-silicon-nickel alloy powder is subjected to insulation coating treatment by phosphoric acid, wherein the thickness of the iron-silicon-nickel alloy powder is 44.7 micrometers; then 1.3kg of PA6T material is selected to be mixed with the pretreated iron-silicon-nickel alloy powder to prepare a soft magnetic composite material, and the soft magnetic composite material is mixed and granulated by a double-screw extruder to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; injecting the prepared soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled, wherein the flow length of the soft magnetic composite material is 26.8cm, so that the coil and the magnetic core are filled with the soft magnetic composite material, forming a layer of outer magnet after the injected soft magnetic composite material is cured, and demolding to obtain the integrally molded inductor, wherein the density of the outer magnet material of the inductor can reach 4.37g/cc, the proportion of the magnetic material reaches 87%, and the initial magnetic permeability of the outer magnet reaches 10.3 mu; the number of turns of the inductor coil is 16, the effective magnetic path length le is 6.39cm, and the effective magnetic core area Ae is 1.198cm2The inductance L @0A at 0A was 17.8. mu.H, the inductance L @15A at 15A was 17.6. mu.H, the inductance L @30A at 30A was 16.6. mu.H, and the inductance L @30A at 45AThe inductance of (L @ 45A) was 14.9. mu.H.
Example 3
Placing the iron-silicon magnetic core into the prefabricated hollow coil, then placing the hollow coil into a mold cavity of an injection mold, and finally closing the mold; 9.2kg of Fe-Si-Ni alloy powder consisting of 90 parts of Fe-Si-Ni alloy powder with an average Wodel sphericity of 92.6% and a median particle diameter D50107.4 μm ferrosilicon-nickel alloy powder and 10 parts of an average Welder sphericity of 93.9% and a median particle diameter D50Is composed of 6.1 mu m iron-silicon-nickel alloy powder, and the surface of the iron-silicon-nickel alloy powder is subjected to insulation coating treatment by phosphoric acid; then 0.8kg of PA6T material is selected to be mixed with the pretreated iron-silicon-nickel alloy powder to prepare a soft magnetic composite material, and the soft magnetic composite material is mixed and granulated by a double-screw extruder to coat a layer of uniform PA6T material on each powder particle to prepare soft magnetic composite particles; injecting the prepared soft magnetic composite particles into a die cavity of a die through injection molding equipment until the die cavity is completely filled, wherein the flow length of the soft magnetic composite material is 26.5cm, so that the coil and the magnetic core are filled with the soft magnetic composite material, forming a layer of outer magnet after the injected soft magnetic composite material is cured, and demolding to obtain the integrally molded inductor, wherein the density of the outer magnet material of the inductor can reach 5.61g/cc, the occupation ratio of the magnetic material reaches 92%, and the initial magnetic permeability of the outer magnet reaches 21.2 mu; the number of turns of the inductor coil is 16, the effective magnetic path length le is 6.39cm, and the effective magnetic core area Ae is 1.198cm2The inductance L @0A at 0A was 24.1. mu.H, the inductance L @15A at 15A was 23.7. mu.H, the inductance L @30A at 30A was 22.7. mu.H, and the inductance L @45A at 45A was 19.8. mu.H.
Table 8 is a comparison of the properties of the outer magnet and the inductor prepared in comparative example 3 and example 3
As shown in table 8, compared with the inductor prepared from the soft magnetic composite material in comparative example 3 in the prior art, the inductor prepared from the soft magnetic composite material provided in example 3 of the present invention has the advantages that the density of the external magnetic material is higher, the magnetic material ratio is larger, the initial permeability of the external magnetic body is significantly increased, and the inductance is significantly increased.
The method for measuring the density of the magnetic material outside the inductor comprises the steps of draining, testing the weight m1 of a product, testing the weight m2 of the product in water, and calculating the density rho = m 1/(m 1-m 2). Test apparatus JA3003J electronic balance
The method for measuring the ratio of the magnetic material comprises the following steps: the magnetic material ratio = weight of added soft magnetic powder/(weight of added soft magnetic powder + weight of added binder), and the weight of the surface coating agent is ignored.
The method for measuring the initial permeability of the outer magnet comprises the following steps: measuring inductance L @0A by using an LCR tester, and then calculating initial permeability mu = L @0A ^ le/(4 ^ pi ^ Ae ^ N ^ 2) of the outer magnet, wherein le is the effective magnetic path length, Ae is the effective magnetic core sectional area, and N is the number of winding turns; testing apparatus TH2829C LCR tester.
Flow length test method: the fluidity of the soft magnetic composite material is determined by adopting the flow length under a certain injection molding condition, the soft magnetic composite material is mixed and granulated by a double screw extruder to prepare soft magnetic composite particles, 1.0kg of the soft magnetic composite particles are added into a charging barrel of injection equipment, the temperature of the charging barrel is set to be 330 ℃, the prefabricated soft magnetic composite particles are melted into fluid feed, the fluid feed is injected into a die cavity by rotating a screw, the injection time is 1s, then the length of a sample is measured, the longer the length of the sample is, the better the fluidity is, and the parameters of the injection equipment are determined; the mold temperature is 120 ℃, the injection pressure is 9Mpa, and the injection speed is 70 mm/s; size of die cavity: the width is 10mm, and the thickness is 2 mm.
Claims (13)
1. A manufacturing method of an integrally formed inductor is characterized by comprising the following steps:
coil presetting: placing the prefabricated hollow coil into a mold cavity of an injection mold or placing the prefabricated hollow coil into a soft magnetic core, and then placing the soft magnetic core into the mold cavity of the injection mold;
mixing and granulating: mixing and granulating soft magnetic powder and a binder to obtain soft magnetic composite particles, wherein the average Wolter sphericity of the soft magnetic powder is 75-100%, preferably 80-100%, and more preferably 85-100%;
injection molding: and carrying out hot melting on the soft magnetic composite particles by injection molding equipment to form a soft magnetic composite material, and injecting the soft magnetic composite material into the mold cavity of the mold to obtain the integrally molded inductor.
2. The method of claim 1, wherein at least a portion of the soft magnetic powder is a first type of particles having an average Waider sphericity of 80% to 100%, preferably 85% to 100%, more preferably 90% to 100%, which is 5% to 100% by weight of the soft magnetic powder.
3. The method of claim 2, wherein the first type of particles have a D value50Is 50 to 110 μm, preferably 70 to 110 μm, and more preferably 90 to 110 μm.
4. The method for manufacturing an integrally formed inductor as claimed in claim 3, wherein a part of the soft magnetic powder is a second type of particles D505 to 40 μm, preferably 5 to 20 μm, and more preferably 5 to 10 μm.
5. The method of manufacturing an integrally formed inductor according to claim 4, wherein the second type of particles have an average Wonder sphericity of 80% to 100%, preferably 85% to 100%, more preferably 90% to 100%.
6. The method for manufacturing the integrally formed inductor according to claim 4 or 5, wherein the weight part ratio of the second type particles to the first type particles is 5-30 parts: 70-95 parts, preferably 7-25 parts: 75-93 parts, more preferably 10-20 parts: 80-90 parts.
7. The method for manufacturing an integrally formed inductor according to any one of claims 1, 2, 4 and 5, wherein the soft magnetic powder is subjected to an insulation coating treatment, 85 to 98 parts, preferably 90 to 96 parts, and more preferably 91 to 94 parts of the soft magnetic powder is subjected to an insulation coating treatment with 0.1 to 2 parts of a surface insulating agent, and then sufficiently mixed with 2 to 15 parts, preferably 4 to 10 parts, and more preferably 6 to 9 parts of a binder and granulated to obtain soft magnetic composite particles.
8. The method of manufacturing an integrally formed inductor according to claim 7, wherein the soft magnetic powder is a metal powder, preferably an alloy powder.
9. The method of claim 7, wherein the soft magnetic powder is one or more of iron powder, sendust powder, amorphous powder, and nanocrystalline powder.
10. Soft magnetic composite material for fluid filling processes according to claim 7, characterized in that the binder is a resin, preferably a thermoplastic resin.
11. The method of claim 7, wherein the adhesive is one or more of epoxy resin, phenolic resin, polycarbonate PC, polyamide PA, polyhexamethylene terephthalamide PA6T, polyoxymethylene POM, polyphenylene oxide PPO, polyphenylene ether PPE, polyethylene terephthalate PET, polybutylene terephthalate PBT, polyphenylene sulfide PPS, liquid crystal polymer LCP, polyimide PI, polysulfone PSF, polyaluminium sulfate PAS, polyethersulfone resin PES, para-aramid fiber PPTA, and polyetheretherketone PEEK.
12. The method of claim 7, wherein the surface insulator is one or more of phosphoric acid, chromic acid, aluminum phosphate, nano-silica, and sodium silicate.
13. The method of claim 7, wherein the soft magnetic core is one or more of a ferrite core, a ferrite powder core, a sendust core, a ferrosilicon nickel core, a ferrosilicon chromium core, a ferronickel molybdenum core, a silicon steel sheet core, an amorphous core, and a nanocrystalline core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010070192.9A CN111151740B (en) | 2020-01-21 | 2020-01-21 | Manufacturing method of integrally formed inductor |
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| CN113096950A (en) * | 2021-04-09 | 2021-07-09 | 江苏瑞德磁性材料有限公司 | Preparation method of soft magnetic powder core with built-in coil |
| CN113327737A (en) * | 2021-05-25 | 2021-08-31 | 合泰盟方电子（深圳）股份有限公司 | Soft magnetic composite material for inductor and preparation method thereof |
| CN113436875A (en) * | 2021-06-25 | 2021-09-24 | 广东精密龙电子科技有限公司 | Low-molding pressure inductance material, preparation method and integrated inductor |
| CN114203428A (en) * | 2021-12-10 | 2022-03-18 | 乐庸一 | Manufacturing method of inductor with optional magnetic core configuration and injection molding inductor |
| CN114300249A (en) * | 2021-12-31 | 2022-04-08 | 安徽龙磁金属科技有限公司 | Manufacturing method of high-power composite molding inductor |
| CN114613567A (en) * | 2022-04-13 | 2022-06-10 | 湖南金磁电子有限公司 | Plastic soft magnetic conductive and wireless charging magnetic isolation device and preparation method and application thereof |
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|---|---|---|---|---|
| CN113096950A (en) * | 2021-04-09 | 2021-07-09 | 江苏瑞德磁性材料有限公司 | Preparation method of soft magnetic powder core with built-in coil |
| CN113327737A (en) * | 2021-05-25 | 2021-08-31 | 合泰盟方电子（深圳）股份有限公司 | Soft magnetic composite material for inductor and preparation method thereof |
| CN113436875A (en) * | 2021-06-25 | 2021-09-24 | 广东精密龙电子科技有限公司 | Low-molding pressure inductance material, preparation method and integrated inductor |
| CN113436875B (en) * | 2021-06-25 | 2022-04-19 | 广东精密龙电子科技有限公司 | Low-molding pressure inductance material, preparation method and integrated inductor |
| CN114203428A (en) * | 2021-12-10 | 2022-03-18 | 乐庸一 | Manufacturing method of inductor with optional magnetic core configuration and injection molding inductor |
| CN114300249A (en) * | 2021-12-31 | 2022-04-08 | 安徽龙磁金属科技有限公司 | Manufacturing method of high-power composite molding inductor |
| CN114613567A (en) * | 2022-04-13 | 2022-06-10 | 湖南金磁电子有限公司 | Plastic soft magnetic conductive and wireless charging magnetic isolation device and preparation method and application thereof |
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