CN109036754B - Preparation method of high-permeability soft magnetic composite material - Google Patents
Preparation method of high-permeability soft magnetic composite material 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
- H01F1/33—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The invention belongs to the field of magnetic material preparation, and particularly relates to a preparation method of a high-permeability soft magnetic composite material. Mixing a soft magnetic alloy with an insulating medium, and preparing a soft magnetic composite material by a hot-pressing thermal deformation process; the soft magnetic alloy in the magnet obtained by thermal deformation is changed into a flaky structure, and all flaky magnetic particles are orderly arranged in parallel along the plane of the magnetic ring (the direction of a working magnetic circuit); simultaneously adding a nano magnetic oxide into the insulating medium; finally obtaining the soft magnetic composite material with high magnetic permeability and anisotropy. The invention has the advantages that: the sheet structure can effectively reduce loss and improve magnetic conductivity, the sheet soft magnetic particles oriented along the plane of the magnetic ring can be directly obtained through a hot-pressing thermal deformation process, and the anisotropic ordered magnetic structure can be obtained without a magnetic field.
Description
Technical Field
The invention belongs to the field of magnetic material preparation, and particularly relates to a preparation method of a high-permeability soft magnetic composite material.
Background
The soft magnetic material is used as a necessary medium for magnetoelectric conversion such as electric energy conversion, signal transmission, electromagnetic compatibility and the like, is widely applied to the fields of information, electric power, energy, traffic, national defense and the like, and is an important functional material and a key basic material of national economy. With the development of informatization and industrialization of modern society, devices and devices are increasingly miniaturized, lightened, high-frequency and integrated, and soft magnetic materials are also developed towards high frequency, high magnetic permeability and low loss. The traditional ferrite soft magnetic material has high resistance and excellent high-frequency performance, but the saturation magnetic induction intensity is low; metallic soft magnetic materials have high magnetic flux and high magnetic permeability, but high frequency loss is high. Soft magnetic composite materials having the advantages of both metal soft magnetic high magnetic flux and soft magnetic ferrite high resistance have become a research hotspot in the field of high-frequency magnetic materials.
The soft magnetic composite material is a soft magnetic material formed by mixing and pressing ferromagnetic powder particles and an insulating medium. Because the iron soft magnetic alloy particles are very small (0.5-5 microns used at high frequency) and are separated by nonmagnetic electric insulating film substances, on one hand, eddy current can be isolated, and the material is suitable for higher frequency; on the other hand, due to the gap effect among the particles, the material has low magnetic permeability and constant magnetic conductivity; and because the particle size is small, the skin phenomenon basically does not occur, and the magnetic conductivity is more stable along with the change of the frequency.
The research on the soft magnetic composite material is carried out in units such as Zhejiang university, China metering university, Hebei industry university, Zhongnan university, Beijing technology university, SiAnn traffic university, Harbin industry university, Chongqing university, Wuhan technology university, Beijing aerospace Naohang university, Nanchang university, and Zhongkou Ningbo Material institute, and the work is focused on three aspects of interface insulation coating, magnetic phase composition design and magnet process optimization so as to improve the magnetic performance and improve the magnetic flux density, the magnetic conductivity and the magnetic loss characteristic. Firstly, interface insulation coating is the research focus of the soft magnetic composite material, and the resistivity is improved and the eddy current loss is reduced by fully insulating and isolating soft magnetic particles; the good coating layer should be thin to ensure high magnetic conductivity and complete in structure to ensure sufficient insulation coating; the insulating coating material may be inorganic (glass frit, water glass, MgO, SiO2, Al2O3, and the like), organic (epoxy resin, phenol resin, silicone, and the like), or organic-inorganic composite coating. Secondly, the magnetic phase composition design is mainly based on the soft magnetic alloy, and the magnetic conductivity, the coercive force, the resistivity and other characteristics of the alloy are improved by adding elements. And thirdly, optimizing the microstructure of the material and improving the magnetic property by mainly adjusting preparation parameters in process optimization.
The low magnetic permeability of the magnet is caused by the self structural characteristics of the soft magnetic composite material, and mainly caused by two factors: firstly, alloy particles are separated by a non-magnetic insulating layer, a magnetic circuit is separated, the magnetic resistance is high, and the thicker the non-magnetic insulating layer in a working magnetic circuit is, the lower the magnetic conductivity is; secondly, a free magnetic pole appears in alloy particles in the magnetization process due to the non-magnetic interface, and the local demagnetization field is large. The combined action of the two factors results in low magnetic permeability and large hysteresis loss of the magnet. The magnetic resistance is directly related to the total thickness of the non-magnetic insulating layer in the magnetic circuit, while the demagnetizing field is determined by the shape of the alloy particles, so that the low permeability of the soft magnetic composite material is inevitably caused by the structure of the soft magnetic composite material. Therefore, how to reduce the local demagnetizing field and the magnetic resistance by optimizing the organization structure is the key for improving the magnetic conductivity of the material and reducing the loss.
Chinese patent 2012104332238 uses a magnetic field to make the soft magnetic alloy particles form a chain-like cluster along the direction of the magnetic field, so as to obtain the unidirectional light transmission characteristic; chinese patents 2009101405358, 2016110014476, 2016110015356 and 2016110017173 adopt sheet-like soft magnetic alloy or ferrite to obtain the composite material in a polymer or paraffin matrix in a magnetic field orientation mode, and an oriented ordered structure has certain optimization on the magnetic permeability or loss of the material, but the defects of low magnetic permeability and high frequency loss of the matrix are still not essentially improved due to the fact that the content of a nonmagnetic phase in the matrix is still too high.
Disclosure of Invention
Aiming at the common problem of low magnetic permeability of the soft magnetic composite material, the invention aims to provide a preparation method of the soft magnetic composite material with high magnetic permeability. Mixing a soft magnetic alloy with an insulating medium, and preparing a soft magnetic composite material by a hot-pressing thermal deformation process; the soft magnetic alloy in the magnet obtained by thermal deformation is changed into a flaky structure, and all flaky soft magnetic alloy particles are arranged in parallel and orderly along the plane of the magnetic ring (the direction of a working magnetic circuit); simultaneously adding a nano magnetic oxide into the insulating medium; finally obtaining the soft magnetic composite material with high magnetic permeability and anisotropy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a soft magnetic composite material with high magnetic permeability comprises the following steps: the soft magnetic alloy particles are of a sheet structure, and all the soft magnetic alloy particles are orderly arranged in parallel along the plane of the magnetic ring (the direction of a working magnetic circuit); high-resistivity interface insulation phases are filled among the soft magnetic alloy particles; the interface insulating phase comprises a nano magnetic oxide; the preparation method comprises the following steps:
1) raw material preparation
Synthesizing and preparing the nano magnetic oxide by a chemical method;
2) insulating coating of soft magnetic alloy particles
After being passivated, the soft magnetic alloy particles are fully mixed with the interface insulation phase to realize the insulation coating of the soft magnetic alloy particles;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 400-800 ℃; performing pressure deformation on the blank through a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 500-1000 ℃, and the thermal deformation amount is 20-90%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Hot pressing is the process of pressing a powder or compact at high temperature to obtain a high density article. Hot deformation is a process of plastically deforming a metal at a relatively high temperature. The hot-pressing thermal deformation process can enable the magnetic alloy to generate plastic deformation while the soft magnetic composite material is densified, alloy particles are changed into sheets from spheres through the plastic deformation, and the pressure direction is vertical to the particle plane.
The magnetic circuit of the soft magnetic composite material during working is a closed loop along the circumference of the magnetic ring. The demagnetization factor of the spherical particles in any direction is 1/3, and the demagnetization factor of the soft magnetic alloy particles in the plane direction is almost zero, so that the local demagnetization field of the in-plane magnetized soft magnetic alloy particles is far lower than that of the spherical particles; if the flaky magnetic powder is distributed orderly and parallelly along the surface of the magnetic ring, the nonmagnetic gap in the magnetic circuit is far smaller than that of the magnetic ring formed by spherical particles with the same volume. Therefore, the sheet alloy can effectively reduce the local demagnetizing field and the magnetic resistance of the magnetic circuit and improve the magnetic conductivity. The magnetic loss of the soft magnetic composite material at the working frequency is mainly hysteresis loss and eddy current loss. The sheet alloy is easy to magnetize along the plane direction, and has high magnetic conductivity and low magnetic hysteresis loss; meanwhile, the sheet structure can effectively reduce the influence of skin effect and reduce eddy current loss. Therefore, the sheet structure can reduce magnetic loss in both hysteresis loss and eddy current loss. The non-magnetic insulating layer in the soft magnetic composite material improves the resistivity, but reduces the content of the soft magnetic alloy and sacrifices partial magnetic performance. The magnetic oxide is used as the insulating layer, so that the magnetic conductivity of the insulating layer can be improved, the magnetic resistance can be reduced, the magnetic conductivity of the composite material can be improved, and the hysteresis loss can be reduced.
Mixing the soft magnetic alloy with an insulating medium, and adding a nano magnetic oxide into the insulating medium to improve the magnetic permeability of an interface insulating phase; preparing a soft magnetic composite material by a hot-pressing thermal deformation process, wherein soft magnetic alloy in a thermal deformation magnet is changed into a sheet structure, and all sheet soft magnetic alloy particles are arranged in parallel and orderly along the plane of a magnetic ring (the direction of a working magnetic circuit); in order not to sacrifice magnetic performance, the proportion of the interface insulating phase is as low as possible, and the mass fraction is 0.1wt.% to 3 wt.%; the novel structure soft magnetic composite material improves the magnetic permeability of the composite material on the basis of an intrinsic structure.
Preferably, the soft magnetic alloy particles are 97wt.% to 99.9wt.%, the interfacial insulation phase is 0.1wt.% to 3wt.%, and the nano magnetic oxide is 0.05wt.% to 2wt.%, in mass percent.
Preferably, the flaky soft magnetic alloy particles include: fe. Fe-Si, Fe-Ni-Mo, Fe-Si-Al or amorphous nanocrystalline alloys.
Preferably, the interface insulating phase comprises: glass powder, water glass, MgO and SiO2、Al2O3One or more of epoxy resin, phenolic resin and organic silicon.
Preferably, the nano magnetic oxide comprises: one or more of manganese zinc ferrite, nickel zinc ferrite, magnesium zinc ferrite, nickel copper zinc ferrite and planar hexagonal ferrite.
Preferably, the nano magnetic oxide is synthesized by a hydrothermal method and a solvothermal method.
The invention has the advantages that:
1. the sheet structure can effectively reduce the influence of skin effect and reduce eddy current loss; the flake alloy is easy to magnetize along the plane direction, and the hysteresis loss is low;
2. the soft magnetic alloy particles are all arranged in parallel and orderly along the plane of the magnetic ring (the working magnetic circuit direction), so that the magnetic circuit reluctance and the demagnetizing field in the working direction of the magnetic ring are reduced, and the magnetic conductivity of the magnetic ring is improved;
3. the interface insulating phase is a mixture of a non-magnetic phase and a nano magnetic oxide, so that the magnetic conductivity of the interface insulating phase is increased, the magnetic resistance of a magnetic circuit is reduced, and the magnetic conductivity of the magnetic ring is further improved;
4. the hot-pressing thermal deformation process can directly obtain flaky soft magnetic particles oriented along the plane of the magnetic ring, and an anisotropic ordered magnetic structure can be obtained without a magnetic field.
Detailed Description
The present invention will be described in detail with reference to the following examples in order to better understand the objects, features and advantages of the present invention. While the invention is described in conjunction with the specific embodiments, it is not intended that the invention be limited to the specific embodiments described. On the contrary, alternatives, modifications and equivalents may be made to the embodiments as may be included within the scope of the invention as defined by the appended claims. The process parameters not specifically mentioned can be carried out according to conventional techniques.
The method comprises the following specific steps:
1) raw material preparation
The magnetic main phase is soft magnetic alloy powder; the interface insulating phase is a non-magnetic phase and a nano magnetic oxide;
the soft magnetic alloy powder includes: fe. Fe-Si, Fe-Ni-Mo, Fe-Si-Al, amorphous nanocrystalline alloy;
the non-magnetic phase comprises: glass powder, water glass, MgO and SiO2、Al2O3And one or more of organosilicon;
the nano magnetic oxide comprises: manganese zinc ferrite, nickel zinc ferrite, magnesium zinc ferrite, nickel copper zinc ferrite, and planar hexagonal ferrite;
the nano magnetic oxide is synthesized by a chemical method, wherein hydrothermal and solvothermal methods are preferably adopted for synthesis;
2) insulating coating of soft magnetic alloy powder
After being passivated, the soft magnetic alloy powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder;
the soft magnetic alloy accounts for as high as possible, and the mass fraction of the soft magnetic alloy is 97-99.9 wt.%;
the proportion of the interface insulating phase is as low as possible, and the mass fraction of the interface insulating phase is 0.1-3 wt%;
the mass fraction of the nano magnetic oxide is 0.05-2 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 400-800 ℃; the blank is subjected to pressure deformation through a thermal deformation process, the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 500-1000 ℃, and the thermal deformation (the relative amount of the height reduction of the blank) is 20-90%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring (the direction of a working magnetic circuit of the magnetic ring); finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Example 1:
1) raw material preparation
The magnetic main phase is Fe-Ni powder; the interface insulating phase is MgO and magnesium-zinc ferrite; the magnetic oxide is synthesized by a hydrothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the Fe-Ni powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of Fe-Ni is 98 wt.%; the mass fraction of the interphase insulating phase was 2 wt.%; magnetic oxide mass fraction 1.2 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 560 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 800 ℃, and the thermal deformation amount is 90%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Table 1 presents the complex permeability data for oriented and unoriented FeNi magnetic rings.
Example 2:
1) raw material preparation
The magnetic main phase is Fe-Si-Al powder; the interface insulating phase is Al2O3And planar hexagonal ferrites; the magnetic oxide is synthesized by a hydrothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the Fe-Si-Al powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of Fe-Si-Al is 98.9 wt.%; mass fraction of interphase insulating phase 1.1 wt.%; magnetic oxide mass fraction 0.5 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 600 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 900 ℃, and the thermal deformation amount is 80%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Table 2 shows the complex permeability of the oriented and unoriented fesai magnet rings.
Example 3:
1) raw material preparation
The magnetic main phase is Fe powder; the interface insulating phase is glass powder and manganese zinc ferrite; the magnetic oxide is synthesized by a hydrothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the Fe powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of Fe is 97 wt.%; the mass fraction of the interphase insulating phase was 3 wt.%; magnetic oxide mass fraction 2 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 660 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 600 ℃, and the thermal deformation amount is 40%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Example 4:
1) raw material preparation
The magnetic main phase is Fe-Si powder; the interface insulating phase is water glass and nickel-zinc ferrite; the magnetic oxide is synthesized by a solvothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the Fe-Si powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of Fe-Si is 97.6 wt.%; the mass fraction of the interphase insulating phase was 2.4 wt.%; magnetic oxide mass fraction 1.6 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 720 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 700 ℃, and the thermal deformation amount is 65%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Example 5:
1) raw material preparation
The magnetic main phase is Fe-Ni-Mo powder; the interface insulating phase is SiO2And nickel copper zinc ferrite; the magnetic oxide is synthesized by a solvothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, Fe-Ni-Mo powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of Fe-Ni-Mo is 98.6 wt.%; mass fraction of interphase insulating phase 1.4 wt.%; magnetic oxide mass fraction 0.8 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 800 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 1000 ℃, and the thermal deformation amount is 55%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Example 6:
1) raw material preparation
The magnetic main phase is amorphous powder; the interface insulating phase is organic silicon and manganese zinc ferrite; the magnetic oxide is synthesized by a solvothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the amorphous powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of amorphous is 99.5 wt.%; mass fraction of interphase insulating phase 0.5 wt.%; magnetic oxide mass fraction 0.3 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 400 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 500 ℃, and the thermal deformation amount is 20%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Example 7:
1) raw material preparation
The magnetic main phase is nanocrystalline powder; the interface insulating phase is water glass and nickel-zinc ferrite; the magnetic oxide is synthesized by a hydrothermal method;
2) insulating coating of soft magnetic alloy powder
After being passivated, the nanocrystalline powder is fully mixed with an interface insulating phase to realize the insulating coating of the soft magnetic alloy powder; wherein the mass fraction of nanocrystals was 99.9 wt.%; mass fraction of interphase insulating phase 0.1 wt.%; magnetic oxide mass fraction 0.05 wt.%;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 500 ℃; performing pressure deformation on the blank by a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 550 ℃, and the thermal deformation amount is 30%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
Claims (3)
1. A preparation method of a soft magnetic composite material with high magnetic permeability is characterized in that the composition structure of the soft magnetic composite material is as follows: the soft magnetic alloy particles are of a sheet structure, and all the soft magnetic alloy particles are orderly arranged along the plane of the magnetic ring in parallel; the flaky soft magnetic alloy particles include: fe. Fe-Si, Fe-Ni-Mo, Fe-Si-Al or amorphous nanocrystalline alloys; high-resistivity interface insulation phases are filled among the soft magnetic alloy particles; the interface insulating phase comprises a nano magnetic oxide; the nano magnetic oxide includes: one or more of manganese zinc ferrite, nickel zinc ferrite, magnesium zinc ferrite, nickel copper zinc ferrite and planar hexagonal ferrite; the content of the soft magnetic alloy particles is 97-99.9 wt.%, the content of the interface insulating phase is 0.1-3 wt.%, and the content of the nano magnetic oxide in the interface insulating phase is 0.05-2 wt.%; the preparation method comprises the following steps:
1) raw material preparation
Synthesizing and preparing the nano magnetic oxide by a chemical method;
2) insulating coating of soft magnetic alloy particles
After being passivated, the soft magnetic alloy particles are fully mixed with the interface insulation phase to realize the insulation coating of the soft magnetic alloy particles;
3) hot-pressing thermal deformation preparation of oriented magnet
Obtaining a blank through a hot pressing process, wherein the hot pressing temperature is 400-800 ℃; performing pressure deformation on the blank through a thermal deformation process, wherein the pressure direction is vertical to the plane of the magnetic ring, the thermal deformation temperature is 500-1000 ℃, and the thermal deformation amount is 20-90%; the soft magnetic alloy in the blank is plastically deformed under the action of pressure and is changed into a sheet shape from a spherical shape, and soft magnetic alloy particles are parallel to the plane of the magnetic ring; finally obtaining the high-magnetic-permeability soft magnetic composite material with high magnetic phase content.
2. The method of claim 1, wherein the interphase insulating phase comprises: glass powder, water glass, MgO and SiO2、Al2O3One or more of epoxy resin, phenolic resin and organic silicon.
3. The method according to claim 1, wherein the nano-magnetic oxide is synthesized by hydrothermal or solvothermal method.
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