CN114464388A - Iron-based amorphous composite magnetic powder core and preparation method thereof - Google Patents
Iron-based amorphous composite magnetic powder core and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
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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 an iron-based amorphous composite magnetic powder core and a preparation method thereof, belonging to the technical field of electronic power. The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, wherein: the mixed powder consists of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, and the insulating material is epoxy resin. The preparation method comprises the steps of mixing FeSiBCr amorphous spherical powder and FeNi50 spherical powder according to a required proportion to obtain mixed powder A; then placing the mixed powder A into a mixed solution of epoxy resin and an organic solvent for insulation coating treatment, fully stirring and drying to obtain mixed powder B; and (3) performing compression molding in a mold, and performing stress relief annealing to obtain the iron-based amorphous composite magnetic powder core. The method has the advantages of simple process flow and short production period, and the obtained composite material magnetic powder core has higher magnetic conductivity, lower loss and high density.
Description
Technical Field
The invention belongs to the technical field of electronic power, and relates to an iron-based amorphous composite magnetic powder core and a preparation method thereof.
Background
The magnetic powder core is prepared by a soft magnetic material coated by a binding agent and an insulating agent through powder metallurgy modes such as pressing and the like. The magnetic powder core has soft magnetic properties which are incomparable with other soft magnetic materials. The magnetic powder core has small powder granularity, two insulating coating layers are coated between particles, so that the resistance of the magnetic powder core is effectively increased, the eddy current loss is reduced, and the magnetic conductivity is not greatly changed along with the frequency, so that the magnetic powder core is widely applied. With the continuous development of the electronic power field, electronic devices are continuously developed towards miniaturization, high frequency and the like, which undoubtedly provides higher challenges for the performance of the magnetic powder core.
At present, an amorphous magnetic core is mainly made into an amorphous thin strip by a copper shaft quenching process through mother alloy, and is made into a magnetic core by winding or mechanically breaking a strip into powder, and the amorphous powder prepared by gas atomization is less applied. The main preparation process of the amorphous magnetic powder core comprises the following steps: smelting master alloy, spraying strip material, mechanically crushing, insulating treatment, pressing and forming, and heat treatment, wherein the coating process and the heat treatment temperature have great influence on the performance of the magnetic powder core.
In order to ensure high amorphous forming degree and reduce cost, the amorphous powder is prepared by industrially adopting a method of mechanically crushing an amorphous strip, but the crushed amorphous particles present polygonal slices with sharp edges and uneven shapes, and an insulating layer is easy to pierce in the pressing process, so that the eddy current loss is increased in the using process. In addition, at present, multiple-link treatment is mostly carried out on the magnetic powder, a series of organic/inorganic coating materials such as a silane coupling agent, an insulating agent, a binder and the like are added, the production cost and the production period in the powder core preparation process are increased through a complex coating process, the soft magnetic performance of the amorphous magnetic powder core can be obviously reduced along with the increase of the coating materials, and the prepared amorphous magnetic powder core has unstable frequency characteristics, namely the magnetic conductivity is sharply reduced along with the increase of the frequency and the direct current bias capability is lower. The development of a high-performance magnetic powder core becomes one of the research hotspots of the current amorphous magnetic powder core material.
For example: chinese patent CN109396416A discloses a novel iron-based amorphous alloy powder and a preparation method of a composite magnetic powder core based on the same, which is to prepare FeSiBPNb alloy with high amorphous forming capability into iron-based amorphous alloy powder by adopting an air atomization method, then compound the iron-based amorphous alloy powder with FeSi metal powder and carry out passivation, coupling and insulation coating treatment, and then carry out compression molding and annealing treatment to obtain the iron-based amorphous alloy powder; the Fe-based amorphous alloy powder is selected to be FeSiBPNb, the coating process is complex, and the industrial large-scale production is not facilitated.
Chinese patent CN112908604A discloses an iron-based amorphous composite magnetic powder core and a preparation method thereof, wherein non-wafer-shaped powder is selected from FeSiB amorphous flake powder and fesibcc amorphous spherical powder, which is easy to pierce an insulating layer in a subsequent pressing process, resulting in increased eddy current loss in a use process; although phosphoric acid solution passivation, ultrasonic and heating stirring and insulation coating treatment are adopted, the treatment process is complex, the consumption of production cost is increased, and the relation between loss and frequency is low.
Chinese patent CN113628825A discloses an iron-based amorphous composite magnetic powder core and a preparation method and application thereof, wherein the iron-based amorphous composite magnetic powder core comprises iron-based amorphous alloy powder and PTFE powder, and the iron-based amorphous alloy powder is Fe73Si11B11C3Cr2Powder, the annealing and sintering of the magnetic ring are realized at one time; although powder discloses particle size selection, it is not possible to confirm whether it is spherical powder, and the need for heat treatment also increases production costs.
In summary, in order to solve the technical defects, it is necessary to develop a new component iron-based amorphous composite magnetic powder core and a preparation method thereof, the preparation method is simple to operate, has small internal stress, good frequency stability and high matching degree of magnetic conductivity and loss, can reduce loss on the basis of high magnetic conductivity, and meets the technical requirements of miniaturization, high frequency and the like.
Disclosure of Invention
The invention solves the technical problem that the component of the existing magnetic powder core is generally single amorphous flaky powder, even if the component of the magnetic powder core is selected as mixed powder, the influence of the component and the shape of the mixed powder on a complex coating mode of adding a silane coupling agent, an insulating agent and a binder is difficult to directly expect, the coating mode cannot be simplified without influencing the expression of the performance of the magnetic powder core, and the technical index of further reducing the loss and improving the frequency stability on the basis of high magnetic conductivity cannot be met.
In order to solve the technical problems, the invention provides the following technical scheme:
an iron-based amorphous composite magnetic powder core, which is composed of mixed powder coated by an insulating material, wherein: the mixed powder consists of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, and the insulating material is epoxy resin.
Preferably, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 50-100 wt.%, and the proportion of the FeNi50 spherical powder is 0-50 wt.% of the total weight.
Preferably, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 50-90 wt.%, and the proportion of the FeNi50 spherical powder is 10-50 wt.% of the total weight.
Preferably, the particle size of the FeSiBCr amorphous spherical powder is 10-55 μm, and the particle size of the FeNi50 spherical powder is 11-52 μm.
Preferably, the epoxy resin is Macklin E44.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, placing the mixed powder A obtained in the step S1 in a mixed solution of epoxy resin and an organic solvent for insulation coating treatment, fully stirring and drying to obtain mixed powder B;
and S3, performing compression molding on the mixed powder B obtained in the step S2 in a mold, and performing stress relief annealing to obtain the iron-based amorphous composite magnetic powder core.
Preferably, the median diameter of the FeSiBCr amorphous spherical powder in the step S1 is 24-26 μm, and the median diameter of the FeNi50 spherical powder is 27-29 μm.
Preferably, the mixed solution in step S2 is obtained by dissolving epoxy resin in an organic solvent, wherein the amount of the epoxy resin is 1.5-2.5 wt.% based on the mass of the mixed powder a.
Preferably, the organic solvent in step S2 is acetone, and the mass ratio of the mixed powder to the solvent is 100 g: 15-25 ml.
Preferably, the pressure forming pressure in the step S3 is 1800-2200MPa, the stress relief annealing temperature is 460-520 ℃, the heat preservation time is 60-120min, the temperature rise rate is 10K/min, and the furnace cooling is carried out.
Preferably, the press molding in step S3 is press molding or cold isostatic press molding.
Preferably, the iron-based amorphous composite magnetic powder core prepared by press forming in step S3 has a complex structure.
The technical scheme provided by the embodiment of the invention at least has the following beneficial effects:
in the scheme, the magnetic powder core is the mixed powder of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the coating process is simply carried out in the mixed solution of epoxy resin and acetone, and compared with the traditional complex coating mode of firstly passivating, then coupling and finally insulating, the method not only saves the production cost, but also improves the production efficiency and is beneficial to industrial large-scale production and popularization.
The composite material magnetic powder core is pressed under the action of larger pressure, larger internal stress can be generated in the pressing process, the soft magnetic performance of the powder core can be reduced due to the internal stress, and the internal stress can be obviously released through heat treatment at certain temperature for certain time, so that the soft magnetic performance of the magnetic powder core is improved.
In the component selection of the magnetic powder core, the used FeSiBCr amorphous powder is amorphous and unstable, and nanocrystalline can be separated out on an amorphous matrix at a proper heat treatment temperature (460-500 ℃), exchange coupling effect can be generated between the amorphous and the nanocrystalline, and the magnetic conductivity of the magnetic powder core can be effectively improved; however, when the heat treatment temperature is high (>500 ℃), the nano crystal grains grow and the magnetic performance is sharply reduced.
In the selection of the magnetic powder core components, the used FeNi50 spherical powder plays the following roles: through the coupling effect of the FeSiBCr amorphous powder and the FeNi50 powder, the magnetic conductivity of the magnetic powder core is effectively improved, and the loss is reduced.
The preparation method of the iron-based amorphous composite magnetic powder core provided by the invention has the advantages of simple process flow and short production period, and the obtained composite magnetic powder core has higher magnetic conductivity and lower loss. And in the epoxy resin coating step, the stirring process lasts for 30-60min, so that the whole particle can be subjected to uniform insulation treatment.
The invention has simple processing process flow and short production period, does not use phosphating solution passivator, silane coupling agent and mica powder insulating agent, only uses the processing process of epoxy resin coating, and the small amount of non-magnetic insulating agent is added, so that the soft magnetic property of soft magnetic materials is not damaged as far as possible, the passivation and insulation effects among magnetic powder particles are maximized, the resistivity of the magnetic powder particles is effectively improved, the eddy current loss of the magnetic powder core is reduced, and the interior of the magnetic powder core which is pressed and molded under the high pressure of 1800 plus 2200MPa is more compact.
The iron-based amorphous composite magnetic powder core of the invention is BmMagnetic permeability mu under the test condition of 1-100kHz and 50mTeConstant at 30.5-36, has good frequency characteristics, and is used in BmLoss P under 50mT, 50kHz test conditionscv≦260KW/m3And the low loss is shown.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an X-ray diffraction diagram of FeSiBCr amorphous spherical powder in the iron-based amorphous composite magnetic powder core of the invention;
FIG. 2 is a particle size distribution diagram of FeSiBCr amorphous spherical powder and FeNi50 spherical powder in the iron-based amorphous composite magnetic powder core of the present invention; wherein: (a) the particle size distribution diagram of FeSiBCr amorphous spherical powder, (b) the particle size distribution diagram of FeNi50 spherical powder;
FIG. 3 is a graph of effective permeability versus frequency for examples 1-5 of the present invention and a comparative example;
FIG. 4 is a graph of loss versus frequency for examples 1-5 of the present invention and comparative examples.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.
FeSiBCr spherical amorphous powder selected in embodiments 1-5 of the invention is Fe88Si6.5B3Cr2.5The component of the FeNi spherical powder is Fe50Ni50。
For Fe of the invention88Si6.5B3Cr2.5The amorphous spherical powder was subjected to X-ray diffraction, and the structure thereof was investigated, as shown in FIG. 1, Fe88Si6.5B3Cr2.5The amorphous spherical powder has an obvious steamed bread peak near 2 theta approximately equal to 45 degrees, which indicates that the powder is amorphous.
Example 1
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 90 wt%, and the insulating material is Macklin E44.
Wherein: the particle size of the FeSiBCr amorphous spherical powder is 15-43 mu m, and the median diameter is 24.6 mu m; the particle size of the FeNi50 spherical powder is 11-43 μm, and the median diameter is 27 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percentage of the epoxy resin in the mixed powder A is 2.0 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 2050MPa, and after stress relief annealing at 480 ℃ for 60min, furnace cooling is performed to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
Example 2
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 80 wt%, and the insulating material is Macklin E44.
Wherein: the particle size of the FeSiBCr amorphous spherical powder is 23-45 mu m, and the median diameter is 25.1 mu m; the particle size of the FeNi50 spherical powder is 14-40 μm, and the median diameter is 27.3 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percent of the epoxy resin in the mixed powder A is 1.8 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 2000MPa, and after stress relief annealing at 480 ℃ for 65min, furnace cooling is performed to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
Example 3
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 70 wt%, and the insulating material is Macklin E44.
Wherein: the particle size of the FeSiBCr amorphous spherical powder is 12-33 mu m, and the median diameter is 25.3 mu m; the particle size of the FeNi50 spherical powder is 20-41 μm, and the median diameter is 28.1 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percentage of the epoxy resin in the mixed powder A is 2.1 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 1950MPa, performing stress relief annealing at 475 ℃ for 60min, and then cooling along with a furnace to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
Example 4
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 60 wt%, and the insulating material is Macklin E44.
Wherein: the particle size of the FeSiBCr amorphous spherical powder is 18-31 mu m, and the median diameter is 24.4 mu m; the particle size of the FeNi50 spherical powder is 21-40 μm, and the median diameter is 27.5 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percentage of the epoxy resin in the mixed powder A is 2.0 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 2000MPa, and after stress relief annealing at 485 ℃ for 60min, furnace cooling is performed to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
Example 5
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 50 wt%, and the insulating material is Macklin E44.
Wherein: as shown in figure 2, the particle size of the FeSiBCr amorphous spherical powder is 10-55 μm, and the median diameter is 24.66 μm; the particle size of the FeNi50 spherical powder is 11-52 μm, and the median diameter is 28.38 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percent of the epoxy resin in the mixed powder A is 1.9 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 2000MPa, and after stress relief annealing at 485 ℃ for 60min, furnace cooling is performed to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
Comparative example
The iron-based amorphous composite magnetic powder core is composed of mixed powder coated by an insulating material, the mixed powder is composed of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the proportion of the FeSiBCr amorphous spherical powder in the mixed powder is 100 wt%, and the insulating material is Macklin E44.
Wherein: the particle size of the FeSiBCr amorphous spherical powder is 16-42 mu m, and the median diameter is 25.1 mu m; the particle size of the FeNi50 spherical powder is 15-45 μm, and the median diameter is 28.3 μm.
The preparation method of the iron-based amorphous composite magnetic powder core comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, dissolving epoxy resin in an acetone solvent to obtain a mixed solution;
s3, placing the mixed powder A obtained in the step S1 in the mixed solution obtained in the step S2 for insulation coating treatment, wherein the mass percentage of the epoxy resin in the mixed powder A is 2.0 wt.%, and the mass ratio of the mixed powder A to the acetone solvent is 100 g: 20ml of the solution; fully stirring and drying to obtain mixed powder B;
s4, performing compression molding on the mixed powder B obtained in the step S3 in a mold to form a ring with the outer diameter of 26.92mm, the inner diameter of 14.73mm and the height of 11.18mm, wherein the compression molding pressure is 2000MPa, and after stress relief annealing at 480 ℃ for 60min, furnace cooling is performed to obtain the iron-based amorphous composite magnetic powder core; wherein the heating rate of the stress relief annealing is 10K/min.
By comparing the permeability and the frequency of the examples 1 to 5 and the comparative example, as shown in FIG. 3, the permeability of the iron-based amorphous composite magnetic powder core in the examples 1 to 5 has no significant change in the frequency range of 10 to 100kHz, and is significantly higher than that of the comparative example. The Fe-based amorphous composite material magnetic powder core prepared by the invention is shown to have higher magnetic permeability and better frequency characteristic compared with the comparative example by adding FeNi50 spherical powder on the basis of the FeSiBCr amorphous spherical powder of the comparative example.
Comparing the loss-frequency of examples 1-5 with the loss-frequency of comparative example, as shown in fig. 4, the loss of the fe-based amorphous composite magnetic powder core in examples 1-5 is significantly lower than that of the comparative example in the frequency range of 10-75kHz, but the loss of the fe-based amorphous composite magnetic powder core in examples 2-4 is higher than that of the comparative example at 75kHz, so the fe-based amorphous composite magnetic powder core in examples 2-4 is not suitable for higher frequencies, and therefore the fe-based amorphous composite magnetic powder core of the present invention needs to select the components, contents and process parameters of the mixed powder of the fe-based amorphous composite magnetic powder core according to the permeability and loss requirements of the fe-based amorphous composite magnetic powder core.
In the scheme, the magnetic powder core is the mixed powder of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, the coating process is simply carried out in the mixed solution of epoxy resin and acetone, and compared with the traditional complex coating mode of firstly passivating, then coupling and finally insulating, the method not only saves the production cost, but also improves the production efficiency and is beneficial to industrial large-scale production and popularization.
The composite material magnetic powder core is pressed under the action of larger pressure, larger internal stress can be generated in the pressing process, the soft magnetic performance of the powder core can be reduced due to the internal stress, and the internal stress can be obviously released through heat treatment at certain temperature for certain time, so that the soft magnetic performance of the magnetic powder core is improved.
In the component selection of the magnetic powder core, the used FeSiBCr amorphous powder is amorphous and unstable, and nanocrystalline can be separated out on an amorphous matrix at a proper heat treatment temperature (460-500 ℃), exchange coupling effect can be generated between the amorphous and the nanocrystalline, and the magnetic conductivity of the magnetic powder core can be effectively improved; however, when the heat treatment temperature is high (>500 ℃), the nano crystal grains grow and the magnetic performance is sharply reduced.
In the selection of the magnetic powder core components, the used FeNi50 spherical powder plays the following roles: through the coupling effect of the FeSiBCr amorphous powder and the FeNi50 powder, the magnetic conductivity of the magnetic powder core is effectively improved, and the loss is reduced.
The preparation method of the iron-based amorphous composite magnetic powder core provided by the invention has the advantages of simple process flow and short production period, and the obtained composite magnetic powder core has higher magnetic conductivity and lower loss. And in the epoxy resin coating step, the stirring process lasts for 30-60min, so that the whole particle can be subjected to uniform insulation treatment.
The invention has simple processing process flow and short production period, does not use phosphating solution passivator, silane coupling agent and mica powder insulating agent, only uses the processing process of epoxy resin coating, and the small amount of non-magnetic insulating agent is added, so that the soft magnetic property of soft magnetic materials is not damaged as far as possible, the passivation and insulation effects among magnetic powder particles are maximized, the resistivity of the magnetic powder particles is effectively improved, the eddy current loss of the magnetic powder core is reduced, and the interior of the magnetic powder core which is pressed and molded under the high pressure of 1800 plus 2200MPa is more compact.
The iron-based amorphous composite magnetic powder core of the invention is BmMagnetic permeability mu under the test condition of 1-100kHz and 50mTeConstant at 30.5-36, has good frequency characteristics, and is used in BmLoss of P at 50mT, 50kHzcv≦260KW/m3And the characteristic of low loss is presented.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An iron-based amorphous composite magnetic powder core, characterized in that the iron-based amorphous composite magnetic powder core is composed of mixed powder coated with an insulating material, wherein: the mixed powder consists of FeSiBCr amorphous spherical powder and FeNi50 spherical powder, and the insulating material is epoxy resin.
2. The iron-based amorphous composite magnetic powder core according to claim 1, wherein the ratio of FeSiBCr amorphous spherical powder in the mixed powder is 50-100 wt.%, and the mass ratio of FeNi50 spherical powder is 0-50 wt.% of the total weight.
3. The iron-based amorphous composite magnetic powder core according to claim 1, wherein the particle size of the FeSiBCr amorphous spherical powder is 10-55 μm, and the particle size of the FeNi50 spherical powder is 11-52 μm.
4. The iron-based amorphous composite magnetic powder core according to claim 1, wherein the epoxy resin is Macklin E44.
5. The method for preparing the iron-based amorphous composite magnetic powder core according to any one of claims 1 to 4, wherein the method comprises the following steps:
s1, mixing the FeSiBCr amorphous spherical powder and the FeNi50 spherical powder according to a required proportion to obtain mixed powder A;
s2, placing the mixed powder A obtained in the step S1 in a mixed solution of epoxy resin and an organic solvent for insulation coating treatment, fully stirring and drying to obtain mixed powder B;
and S3, performing compression molding on the mixed powder B obtained in the step S2 in a mold, and performing stress relief annealing to obtain the iron-based amorphous composite magnetic powder core.
6. The method of claim 5, wherein the FeSiBCr amorphous spherical powder in step S1 has a median diameter of 24-26 μm, and the FeNi50 spherical powder has a median diameter of 27-29 μm.
7. The method of claim 5, wherein the mixed solution of step S2 is obtained by dissolving epoxy resin in organic solvent, and the amount of epoxy resin is 1.5-2.5 wt.% based on the mass of the mixed powder.
8. The method of claim 7, wherein the organic solvent in step S2 is acetone, and the mass ratio of the mixed powder to the solvent is 100 g: 15-25 ml.
9. The method as claimed in claim 6, wherein the compression molding pressure in step S3 is 1800-2200MPa, the stress relief annealing temperature is 460-520 ℃, the holding time is 60-120min, the heating rate is 10K/min, and the core is cooled with the furnace.
10. The method of claim 6, wherein the compression molding in step S3 is compression molding or cold isostatic pressing.
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| CN117497278A (en) * | 2023-12-29 | 2024-02-02 | 天通控股股份有限公司 | High-permeability low-loss iron-based amorphous composite magnetic powder core and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117497278A (en) * | 2023-12-29 | 2024-02-02 | 天通控股股份有限公司 | High-permeability low-loss iron-based amorphous composite magnetic powder core and preparation method thereof |
| CN117497278B (en) * | 2023-12-29 | 2024-03-12 | 天通控股股份有限公司 | High-permeability low-loss iron-based amorphous composite magnetic powder core and preparation method thereof |
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