CN115116732A - Pot-shaped alloy magnetic core and preparation method thereof - Google Patents
Pot-shaped alloy magnetic core and preparation method thereof Download PDFInfo
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- CN115116732A CN115116732A CN202210840572.5A CN202210840572A CN115116732A CN 115116732 A CN115116732 A CN 115116732A CN 202210840572 A CN202210840572 A CN 202210840572A CN 115116732 A CN115116732 A CN 115116732A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
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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 relates to the technical field of magnetic core preparation, and provides a preparation method of a pot-shaped alloy magnetic core, which comprises the following steps: s1, manufacturing a green body: preparing alloy magnetic powder, firstly pressing the alloy magnetic powder into a columnar or square rough blank, and then finely engraving the rough blank by using a fine engraving machine to form a can-shaped fine engraving blank with a groove; s2, heat treatment; sending the refined carving blank into a continuous heat treatment furnace, carrying out heat treatment at a certain temperature for a period of time, then carrying out vacuum-pumping impregnation for a period of time, and carrying out pressurized impregnation to obtain a crude product of the pot-shaped alloy magnetic core; s3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core; the preparation method has the advantages that the obtained pot-shaped magnetic cores are good in consistency, the cost is saved, the production line efficiency is improved, and the precision and the stability of products are guaranteed; and the obtained pot-shaped alloy magnetic core has perfect appearance effect and high yield.
Description
Technical Field
The invention relates to the technical field of magnetic core preparation, in particular to a pot-shaped alloy magnetic core and a preparation method thereof.
Background
Soft magnetic materials, which refer to magnetic materials in which magnetization occurs at Hc of not more than 1000A/m, can achieve maximum magnetization with a minimum external magnetic field, have low coercive force and high permeability, and are widely used in electrical and electronic devices. The soft magnetic core refers to a magnetic core produced by using a soft magnetic material, and comprises iron nickel, iron silicon aluminum, iron powder core, ferrite and the like according to component classification. The pot type magnetic core is one of the commonly used magnetic cores, and is named because it is shaped like a pot.
In the application of the pot type magnetic core, the framework and the winding are almost wrapped by the magnetic core, so that the shielding effect on EMI (the EMI refers to the interference caused by the work of electronic products to other peripheral electronic products, and the related EMC specification is the problem frequently encountered by electronic and electric products, and the interference type is conducted interference and radiated interference) is very good. The sizes of the pot-type magnetic cores all accord with IEC standards, the interchangeability is very good during manufacturing, and a simple framework (without contact pins) and a PCB installation framework (with contact pins) can be provided; due to the design of the pot shape, the cost is higher compared with other types of magnetic cores with the same size; it is not suitable for application to high power transformer inductors because its shape is not conducive to heat dissipation.
In the prior art, a conventional manufacturing method for manufacturing a pot-shaped (shaped) alloy magnetic core is a mold forming method, and a customized mold and a customized tool are adopted to manufacture the pot-shaped (shaped) alloy magnetic core according to a blank, for example, a Chinese patent with the publication number of CN105070478A discloses a manufacturing method of a pot-shaped magnetic core, which comprises the following steps: performing primary ball milling, pre-sintering, secondary ball milling, die-casting molding and sintering on ferrite powder, and further comprising the step of splicing the sintered magnetic cores, wherein in the process of pressing molding and splicing by using a die, the structural stability of the prepared product is poor and the consistency of the prepared pot-shaped magnetic core product is poor; in addition, the customized die has higher cost, longer period, high die rejection rate and different die materials, so that more uncontrollable factors of stability are caused, the forming output effect of the alloy magnetic core product is influenced, and the application of the alloy magnetic core product in downstream electronic devices is influenced.
Disclosure of Invention
In order to solve the problems of difficult preparation and immature technology of the existing pot-shaped alloy magnetic core in the market, the technical scheme adopted by the invention is that the pot-shaped (shaped) alloy magnetic core is prepared by combining the alloy magnetic core forming and numerical control engraving, the obtained product has good and stable consistency, and the preparation method has the characteristics of environmental protection, convenience in use, high production efficiency, strong operability and higher intelligent production degree.
The invention provides a preparation method of a pot-shaped alloy magnetic core, which comprises the following steps:
s1, manufacturing a green body: preparing alloy magnetic powder, firstly pressing the alloy magnetic powder into a columnar or square rough blank, and then finely engraving the rough blank by using a fine engraving machine to form a can-shaped fine engraving blank with a groove;
s2, heat treatment: sending the refined carving blank into a continuous heat treatment furnace, carrying out heat treatment at a certain temperature for a period of time, then carrying out vacuum-pumping impregnation for a period of time, and carrying out pressurized impregnation to obtain a crude product of the pot-shaped alloy magnetic core;
s3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
Further, when finishing engraving in S1: firstly, carving a U-shaped groove on the outer side; then longitudinally forming a hole on the shaft center to form a center hole; finally, the inner annular groove is carved to form a central column at the center.
Further, at least one U-shaped groove is formed in the U-shaped groove.
Further, the heat treatment in S2 is carried out for 2-4 hours at 600-800 ℃.
Further, when impregnation is performed in S2, the strength is increased to 500N or more.
Further, in the impregnation in S2, the impregnation temperature is normal temperature, and the impregnation liquid is a thermosetting resin, and the thermosetting resin may be an epoxy resin and/or a phenolic resin, preferably a mixture thereof.
Further, the alloy magnetic powder is any one of an iron-nickel magnetic powder core, an iron-silicon magnetic powder core and an iron-silicon-aluminum magnetic powder core.
Further, the iron-nickel magnetic powder core comprises 50-60% of iron and 40-50% of nickel by weight percentage; the ferrosilicon magnetic powder core comprises 5-10% of silicon and 90-95% of iron by weight percentage; the sendust magnetic powder core comprises, by weight, 5-10% of aluminum, 5-10% of silicon, and 80-90% of iron.
A pot-shaped alloy magnetic core prepared by any one of the above preparation methods.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the preparation method can well meet the manufacturing requirement of products with the height-thickness ratio of more than 5, and the obtained products have good stability and high saturation magnetic flux density, and are suitable for use in high-current and high-power electronic devices.
2. According to the preparation method, after the columnar solid rough blank is pressed, the solid rough blank is directly subjected to fine engraving, the U-shaped notch, the central hole and the annular groove are sequentially subjected to fine engraving, and then the fine engraved green blank is subjected to heat treatment, so that the finally obtained pot-shaped magnetic core is good in consistency, the cost is saved, the production line efficiency is improved, and the precision and the stability of the product are ensured; and the obtained pot-shaped alloy magnetic core has perfect appearance effect and high yield.
3. The preparation method is simple and convenient, has strong operability, makes the preparation personnel not make the die difficult any more, and shortens the production period.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a pot-shaped alloy magnetic core provided in embodiment 1 of the present invention;
FIG. 2 is a plan view of a pot-shaped alloy magnetic core provided in example 1 of the present invention;
fig. 3 is a top view of a pot-shaped alloy magnetic core according to embodiment 2 of the present invention;
icon: 1-pot-shaped alloy magnetic core, 11-central column, 111-central hole, 12-annular groove, 13-annular groove outer wall and 131-U-shaped groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of a method for manufacturing a pot-shaped alloy magnetic core according to an embodiment of the present invention.
A preparation method of a pot-shaped alloy magnetic core comprises the following steps:
s1, manufacturing a green body: preparing alloy magnetic powder and auxiliary ingredients, firstly pressing into a cylindrical or square rough blank, and then finely engraving the rough blank by using a fine engraving machine to form a can-shaped fine engraving blank with a groove;
in the prior art, the preparation of the die mostly adopts the modes of 'rough die forming', 'complex multi-set die forming', 'tank-shaped multi-part splicing', 'die + cooked blank processing', the pressed blank is directly subjected to heat treatment after being formed by adopting the mode, the pressed blank forming is directly pressed into a green blank with a groove, namely, the shape of a rough product is obtained by the pressing mode, and then the heat treatment operation is carried out; however, in the production process using a mold, there is a problem that the green body press precision is too poor, especially when the height-thickness ratio is too large (for example, when the height-thickness ratio is more than 5), the production process of the product cannot maintain stability and density uniformity due to the step of the structure of the can-shaped product itself and the large unit pressure during the production. Because the outer walls of the U-shaped groove and the annular groove are thin, the forming is difficult in the pressing process, even if the forming is carried out because the powder density of the outer side wall is low, the side wall is provided with the groove, the green pressing precision is poor, and the stability is poor, so that the defects are generated in the subsequent heat treatment process of the U-shaped groove part and the annular groove part in the tank, or the defects are generated in the cooked blank processing. The accuracy and defect degree of the U-shaped groove and the annular groove are directly related to the performance of the element after winding, such as poor EMI shielding effect and the like. Therefore, the three factors of large unit pressure, stepped structure and large height-thickness ratio can cause unstable products made by the die or a plurality of defects (such as uneven density, high instability, dark crack, layer formation and the like), and continuous production can not be carried out.
Therefore, the inventor innovatively provides a new process for preparing the pot-shaped magnetic core, which mainly uses a blank engraving method to manufacture a pot-shaped alloy magnetic core product with a large height-thickness ratio, and the core of the process is that after a columnar solid rough blank is pressed, the solid rough blank is directly subjected to fine engraving, and particularly, if the cylindrical rough blank is a cylindrical parison, the process comprises the following steps of: importing a design size; the side surface of the cylinder is subjected to fine carving by a cutter; the cutter is provided with a U-shaped groove 131; the cutter is provided with a cylindrical axial center hole 111; the cutter is provided with a circular groove 12 inside the cylinder. If the square blank is adopted, the design size is imported; carving the square billet into a cylindrical billet; the subsequent steps are the same as the cylindrical processing step. In addition, in order to reduce the processing of top surface and bottom surface, when the rough blank is formed, through control feeding volume and pressure, guarantee that the height of cylinder is unanimous with the design height of jar type magnetic core.
The reason for adopting the steps is that: the U-shaped groove 131 and the annular groove 12 are the parts most prone to mechanical processing defects, and the inventor presses a solid rough blank and then opens the U-shaped groove 131, so that a thicker radial distance can be ensured during grooving, and the problem that the processing surface and other connection parts of the U-shaped groove 131 are cracked due to mechanical stress concentration and the like caused by over-thin material wall, and subsequent use performance is affected is avoided; then, the center of the solid rough blank is longitudinally punched to form a center hole 111, and when the annular groove 12 is opened on the basis, the center hole 111 is machined, the groove is positioned more accurately, and materials near the U-shaped groove 131 are cut, so that the feeding and the fine engraving are realized, the feeding amount is further reduced, the machining process is short, the working efficiency is higher, the cutter abrasion is reduced, the service life of equipment is objectively prolonged, and the precision and the stability of the obtained green blank are higher.
S2, heat treatment: sending the carved blank into a continuous heat treatment furnace, carrying out heat treatment at 600-800 ℃ for 2-4 hours, then carrying out impregnation by adopting vacuum impregnation equipment, and increasing the strength to over 500N, wherein the impregnation temperature is normal temperature, the impregnation liquid adopts thermosetting resin, and the thermosetting resin can be preferably a mixture of epoxy resin and phenolic resin to obtain a crude product of the pot-shaped alloy magnetic core;
the inventor presses the solid rough blank, then opens the U-shaped groove, the center hole and the internal ring groove, then directly heat-treats the carved blank, reduces the processing step of the cooked blank commonly used in the field after heat treatment in the prior art, because the cooked blank processing is more difficult than the green blank, because the hardness of the material is large after heat treatment, if the cooked blank processing is carried out, the requirement for the cutter is higher, and once the processing is not good, because the powder is formed by heat treatment, not only the waste of the raw material is caused, but also the processing from the beginning is needed again, the trouble and the labor are wasted, the production cost is increased, and the working efficiency is reduced; the inventor focuses on green body treatment before heat treatment, even if the green body is not well formed, economic loss can not be caused by re-processing, the benefit can not be influenced too much, the entering production process can be adjusted timely, the precision of the green body treatment at the early stage is higher, the subsequent treatment process is simplified, only burrs or other problems of uneven surfaces need to be repaired, the subsequent workload is reduced, the production line efficiency is improved, and the precision and the stability of products are ensured.
S3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
In addition, one U-shaped groove can be formed on one side, one U-shaped groove can be formed on the opposite side (namely two U-shaped grooves are formed), or a plurality of U-shaped grooves are uniformly formed on the outer side and can be adjusted according to the use requirement; when two U-shaped grooves need to be opened, the cutter finishes opening the U-shaped groove on one side; and then the opposite side is provided with a U-shaped groove. In addition, the bottom of the U-shaped groove can be opened to the bottom surface of the rough blank or not during fine engraving, namely, a certain distance is reserved between the bottom surface of the rough blank and the bottom surface of the rough blank, and the U-shaped groove can be machined according to use requirements.
Preferably, the alloy magnetic powder is any one of an iron-nickel magnetic powder core, an iron-silicon-aluminum magnetic powder core or a ferrite core, and can also be pure iron powder. Specifically, the iron-nickel magnetic powder core comprises 50-60% of iron and 40-50% of nickel by weight percentage; the ferrosilicon magnetic powder core comprises 5-10% of silicon and 90-95% of iron by weight percentage; the sendust magnetic powder core comprises, by weight, 5-10% of aluminum, 5-10% of silicon, and 80-90% of iron.
A pot-shaped alloy magnetic core prepared by any one of the above preparation methods.
Example 1 iron silicon
A preparation method of a pot-shaped alloy magnetic core comprises the following steps:
s1, manufacturing a green body: preparing 500g of iron silicon powder and auxiliary ingredients, after powder blending, firstly pressing into a cylindrical rough blank, and then carrying out fine engraving on the rough blank by adopting a fine engraving machine: firstly, carving an outer U-shaped groove, wherein only one U-shaped groove is formed in the embodiment; then, longitudinally forming a hole on the shaft center to form a center hole; finally, carving an internal annular groove, and carving according to the height-thickness ratio of 7 to obtain the outer wall of the annular groove so as to form a central column at the center;
s2, heat treatment: sending the refined carving blank into a continuous heat treatment furnace, carrying out heat treatment at 600-800 ℃ for 2-4 hours, then carrying out impregnation by adopting vacuum impregnation equipment to increase the strength to 500N, wherein the impregnation liquid adopts epoxy resin and phenolic resin 1: 1 at normal temperature to obtain a crude product of the pot-shaped alloy magnetic core;
s3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
Through detection, the main technical performance indexes of the product obtained by the embodiment are as follows: the effective magnetic conductivity range is 26-90 mu; the Curie temperature is 700 ℃; the maximum working temperature is 130-200 ℃; the loss of 50KHz/100mT is 650mw/cm 3 (ii) a The saturation induction intensity is 16000 gauss; under the direct-current magnetic field, the value of the direct-current bias magnetic field is 11500A/m when the magnetic conductivity is reduced to 50%; the temperature stability is good.
Example 2 iron Nickel
A preparation method of a pot-shaped alloy magnetic core comprises the following steps:
s1, manufacturing a green body: preparing 500g iron nickel powder and auxiliary ingredients, after powder blending, firstly pressing into a cylindrical rough blank, and then carrying out fine engraving on the rough blank by adopting a fine engraving machine: firstly, U-shaped grooves on the outer sides are carved, and in the embodiment, the opposite sides of the U-shaped grooves are respectively provided with one U-shaped groove; then, longitudinally forming a hole on the shaft center to form a center hole; finally, carving an internal annular groove, and carving according to the height-thickness ratio of 6 to obtain the outer wall of the annular groove so as to form a central column at the center;
s2, heat treatment: sending the refined carving blank into a continuous heat treatment furnace, carrying out heat treatment at 600-800 ℃ for 2-4 hours, then carrying out impregnation by adopting vacuum impregnation equipment to increase the strength to 550N, wherein the impregnation liquid adopts epoxy resin and phenolic resin 1: 1, treating at normal temperature to obtain a crude product of the pot-shaped alloy magnetic core;
s3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
Through detection, the main technical performance indexes of the product obtained by the embodiment are as follows: the effective magnetic conductivity range is 26-125 mu; curie temperature 500 ℃; the maximum working temperature is 130-200 ℃; the loss of 50KHz/100mT is 280mw/cm 3 (ii) a The saturation induction intensity is 14000 gauss; under the direct-current magnetic field, the numerical value of the direct-current bias magnetic field is 14300A/m when the magnetic conductivity is reduced to 50%; the temperature stability is good.
Example 3 Ferro-silico-alumino
A preparation method of a pot-shaped alloy magnetic core comprises the following steps:
s1, manufacturing a green body: preparing 500g of iron-silicon-aluminum powder and auxiliary ingredients, after powder blending, firstly pressing into a cylindrical rough blank, and then carrying out fine engraving on the rough blank by using a fine engraving machine: firstly, carving an outer U-shaped groove, wherein only one U-shaped groove is formed in the embodiment; then, longitudinally forming a hole on the shaft center to form a center hole; finally, carving an internal annular groove, and carving according to the height-thickness ratio of 8 to obtain the outer wall of the annular groove so as to form a central column at the center;
s2, heat treatment: sending the refined carving blank into a continuous heat treatment furnace, carrying out heat treatment at the temperature of 600-800 ℃ for 2-4 hours, then carrying out impregnation by adopting vacuum impregnation equipment to increase the strength to 600N, wherein the impregnation liquid adopts a mixture of epoxy resin and phenolic resin, and the treatment temperature is normal temperature to obtain a crude product of the pot-shaped alloy magnetic core;
s3, trimming and cleaning the crude product pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
Through detection, the main technical performance indexes of the product obtained by the embodiment are as follows: the effective magnetic conductivity range is 14-125 mu; curie temperature 500 ℃; the maximum working temperature is 130-200 ℃; the loss of 50KHz/100mT is 260mw/cm 3 (ii) a The saturation induction intensity is 10500 gauss; under the direct-current magnetic field, the value of the direct-current bias magnetic field is 7200A/m when the magnetic conductivity is reduced to 50%; the temperature stability is good.
Comparative example 1
This comparative example differs from example 1 in that: s1, directly putting the powder into a grinding tool with a U-shaped groove, a central hole and an annular groove for press forming, and then carrying out high-temperature combustion forming on the sealed die; and grinding the sintered and molded product to enable the product to meet the required size requirement.
Through detection, the product obtained by the comparative example achieves the following main technical performance indexes: the effective magnetic conductivity range is 10-90 mu; curie temperature 500 ℃; the maximum working temperature is 130-200 ℃; the saturation induction intensity is 7000 gauss; the density of the outer ring of the product is poor, and the product has obvious cracks and defects.
In conclusion, the preparation method can meet the manufacturing requirement of the product with the height-thickness ratio of more than 5, and the manufactured product has good stability, high saturation magnetic flux density, uniform central hole distribution, small eddy current loss, good product stability and wide application range.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The preparation method of the pot-shaped alloy magnetic core is characterized by comprising the following steps of:
s1, manufacturing a green body: preparing alloy magnetic powder, firstly pressing the alloy magnetic powder into a cylindrical or square rough blank, and then finely engraving the rough blank by using a fine engraving machine to form a can-shaped fine engraving blank with a groove;
s2, heat treatment: sending the carved blank into a continuous heat treatment furnace, carrying out heat treatment, then carrying out vacuum impregnation for a period of time, and carrying out pressurized impregnation to obtain a crude product of the pot-shaped alloy magnetic core;
s3, trimming and cleaning the crude pot-shaped alloy magnetic core after heat treatment; and finally, electrostatic painting is adopted to obtain the pot-shaped alloy magnetic core.
2. The method for producing a pot alloy magnetic core according to claim 1, wherein, at the time of the finish-engraving in S1: firstly, carving a U-shaped groove on the outer side; then, longitudinally punching the axis of the rough blank to form a central hole; finally, the inner annular groove is carved to form a central column at the center.
3. The method of manufacturing a pot alloy magnetic core according to claim 2, wherein at least one U-shaped groove is opened.
4. The method for preparing a pot-shaped alloy magnetic core according to claim 1, wherein the heat treatment in S2 is performed at 600-800 ℃ for 2-4 hours.
5. The method of producing a pot alloy magnetic core according to claim 1, wherein the strength is increased to 500N or more in the impregnation at S2.
6. The method of producing a pot-shaped alloy magnetic core according to claim 5, wherein the impregnation in S2 is carried out using a thermosetting resin at room temperature.
7. The method for manufacturing a pot-shaped alloy magnetic core according to claim 1, wherein the alloy magnetic powder is any one of an iron-nickel magnetic powder core, an iron-silicon magnetic powder core and an iron-silicon-aluminum magnetic powder core.
8. The method of claim 7, wherein the iron-nickel magnetic powder core comprises, in weight percent, 50-60% iron and 40-50% nickel; the ferrosilicon magnetic powder core comprises 5-10% of silicon and 90-95% of iron by weight percentage; the sendust core comprises, by weight, 5-10% of aluminum, 5-10% of silicon and 80-90% of iron.
9. A pot-shaped alloy magnetic core produced by the production method according to any one of claims 1 to 8.
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| CN112140304A (en) * | 2020-09-22 | 2020-12-29 | 常熟浩博电子科技有限公司 | Engraving and molding process of soft magnetic ferrite product |
| CN112614666A (en) * | 2020-12-07 | 2021-04-06 | 山东航天电子技术研究所 | Magnetic core structure and manufacturing method of large-size spliced transformer |
| CN114724835A (en) * | 2022-03-08 | 2022-07-08 | 天通（六安）新材料有限公司 | Production of metal soft magnetic powder core is with automatic device that contains soaking |
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