CN110853910B - Preparation method of high-permeability low-loss soft magnetic composite material and magnetic ring thereof - Google Patents
Preparation method of high-permeability low-loss soft magnetic composite material and magnetic ring thereof Download PDFInfo
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- 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
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- 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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- H01F27/24—Magnetic cores
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- 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
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- 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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Abstract
The invention discloses a preparation method of a high-permeability low-loss soft magnetic composite material, which comprises the following steps of coating a magnetic oxide particle layer outside spherical soft magnetic alloy particles to form mixed powder; filling the mixed powder into a die to press and form the mixed powder; applying an external magnetic field to the mixed powder in the molding process, wherein the magnetic field is parallel to the working magnetic circuit plane and is vertical to the normal direction of the working magnetic circuit plane; and performing stress relief annealing to obtain the soft magnetic composite material. The technical scheme is very simple and convenient, has no strict requirements on magnetic powder and equipment, does not need to make great improvement on the existing equipment, and can realize the high performance of the soft magnetic material only by adding external magnetic field applying equipment; the soft magnetic alloy and the magnetic oxide are asymmetrically distributed in the horizontal and vertical directions of the magnetic ring, so that the magnetic conductivity in the working magnetic path direction is higher and the loss is lower; the invention has the advantages of less adopted equipment, less process steps and simple process, and can quickly realize the industrial application of the soft magnetic composite material.
Description
Technical Field
The invention relates to the field of magnetic material preparation, in particular to a preparation method of a high-permeability low-loss soft magnetic composite material and a magnetic ring thereof.
Background
Soft magnetic materials have low coercive force and high magnetic permeability, and thus are easy to magnetize and demagnetize, and are widely used in energy conversion and communication equipment.
The most significant disadvantage of soft magnetic composites is the low permeability due to the separation of the magnetic particles by the nonmagnetic material, the magnetic circuit breaking. At present, many techniques have been used to replace the traditional insulating medium with magnetic oxide, which not only can increase the resistivity, but also can not increase the magnetic resistance of the magnetic circuit so much, and reduce the loss of the magnetic conductivity. It is clear that the permeability of soft magnetic composites is still low.
How to realize the soft magnetic composite material with high magnetic conductivity and low loss and the preparation of the corresponding material by a simple and feasible technical scheme still needs to be solved urgently.
Disclosure of Invention
The present invention aims to provide a method for preparing a soft magnetic composite material with high magnetic permeability and low loss, which can solve one or more of the above technical problems.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a preparation method of a soft magnetic composite material with high magnetic permeability and low loss comprises the steps of coating a magnetic oxide particle layer outside spherical soft magnetic alloy particles to form mixed powder; filling the mixed powder into a die to press and form the mixed powder; applying an external magnetic field to the mixed powder in the molding process, wherein the external magnetic field is parallel to the working magnetic circuit plane and is perpendicular to the normal direction of the working magnetic circuit plane; and performing stress relief annealing to obtain the soft magnetic composite material.
In the conventional theory of the prior art, the spherical soft magnetic alloy particles have the same magnetic anisotropy, and the application of an external magnetic field to the spherical soft magnetic alloy particles is theoretically useless, but the invention departs from the conventional thought and creatively applies an external magnetic field parallel to the working magnetic circuit plane, and the soft magnetic alloy and the magnetic oxide are magnetized under the action of the external magnetic field, and the magnetization direction of the soft magnetic alloy and the magnetic oxide is consistent with that of the external magnetic field. The magnetized magnetic powder is arranged more closely and orderly in the magnetic field direction due to the magnetic action. In addition, the smaller magnetic oxides preferentially fill the horizontal gaps between the large-sized soft magnetic alloy particles. Therefore, the magnetic oxide particles form asymmetrical distribution around the spherical soft magnetic alloy particles, namely, the content of the magnetic oxide is higher along the external magnetic field direction, and the content of the magnetic oxide is lower along the axial direction of the magnetic ring. The result of this arrangement is a lower reluctance and a higher resistivity of the magnetic circuit in the horizontal direction, so that a higher permeability and lower losses can be obtained.
Preferably: the magnetic field intensity is 0.1-10T.
Preferably: the magnetic field is one of a coil magnetic field, an electromagnet magnetic field or a pulse magnetic field.
Preferably: and applying an external magnetic field all the time in the process of pressing and forming the mixed powder.
Preferably: the mass fraction of the spherical magnetically soft alloy particles is 90-99.9 wt.%; the mass fraction of the magnetic oxide layer is 0.1wt.% to 10 wt.%.
Preferably: the spherical soft magnetic alloy particles are one of Fe, Fe-Si, Fe-Ni-Mo, Fe-Si-Al, Fe-Si-B amorphous and iron-based nanocrystalline alloys.
Preferably: the magnetic oxide layer is Mn-Zn ferrite, Ni-Zn ferrite, Mg-Zn ferrite, Ni-Cu-Zn ferrite, Co2Y plane hexaferrite, Co2One of Z-plane hexaferrites. Theoretically, several magnetic oxides have stable performance, and spherical soft magnetic alloy particles can be coated by mixing various magnetic oxides.
Preferably: the diameter of the spherical soft magnetic alloy particles is 5-40 mu m; the diameter of the magnetic oxide particles is 10nm to 200 nm.
Preferably: the spherical magnetically soft alloy particles are prepared by an air atomization method or a water atomization method.
The invention also aims to provide a magnetic ring made of the soft magnetic composite material, which can be widely applied to devices such as motors, power frequency to high frequency transformers, sensors, choke coils, noise filters, fuel injectors and the like.
A magnetic ring comprising the preparation method of the high-permeability low-loss soft magnetic composite material comprises a magnetic ring body, wherein the magnetic ring body comprises spherical soft magnetic alloy particles and magnetic oxide particles; the magnetic oxide particles are coated outside the spherical soft magnetic alloy particles, so that the magnetic oxide particles are distributed at the interfaces of the spherical soft magnetic alloy particles; in the direction along the plane of the magnetic ring, the spherical soft magnetic alloy particles are arranged closely and orderly, and the magnetic oxide particles are preferably filled in the horizontal gap; the spherical soft magnetic alloy particles are arranged disorderly along the normal axis direction of the magnetic ring, and the filling amount of the magnetic oxide particles at the vertical gap is less; the arrangement of the spherical soft magnetic alloy particles and the magnetic oxide particles in the magnetic ring enables the distribution of the spherical soft magnetic alloy particles and the magnetic oxide powder to have anisotropy in the magnetic ring.
Compared with the uniform distribution of the soft magnetic alloy particles and the magnetic oxide, the anisotropically distributed composite material of the present invention has higher magnetic permeability and lower loss.
The invention has the technical effects that:
1. the technical scheme is very simple and convenient, has no strict requirements on magnetic powder and equipment, does not need to make great improvement on the existing equipment, and can realize the high performance of the soft magnetic material only by adding external magnetic field applying equipment;
2. the soft magnetic alloy and the magnetic oxide are asymmetrically distributed in the horizontal and vertical directions of the magnetic ring, so that the magnetic conductivity in the working magnetic path direction is higher and the loss is lower;
3. the invention has the advantages of less adopted equipment, less process steps and simple process, and can quickly realize the industrial application of the soft magnetic composite material.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 shows a SEM image of the coated sample of example 1;
FIG. 2 shows a scanning electron micrograph of a sample in example 1 with the magnetic field oriented horizontally;
FIG. 3 shows a scanning electron micrograph of a sample in example 1 (for comparison) which has not been oriented by a magnetic field;
FIG. 4 shows the effective permeability of the sample of example 1;
FIG. 5 shows the magnetic losses of the samples of example 1;
FIG. 6 shows the real part of the complex permeability of the sample in example 1;
figure 7 shows the μ Q product for the samples in example 1.
FIG. 8 is a schematic representation of a composite material of the present invention;
in the accompanying fig. 4-7: normal indicates the curve of the sample oriented without the application of an external magnetic field; parallell represents the curve of the sample with the orientation of the external magnetic field applied.
In fig. 8: 1 spherical soft magnetic alloy particles, 2 magnetic oxide particles.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided only for the purpose of illustrating the present invention and are not to be construed as unduly limiting the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 8, fig. 1 is a schematic view of a single spherical soft magnetic alloy particle coated with magnetic oxide particles as an insulating layer; fig. 8 is a schematic cross-sectional view of the ideal state soft magnetic composite material, and in fig. 8, assuming that spherical soft magnetic alloy particles are the same, magnetic oxide particles are the same.
In the following examples, a common annular soft magnetic composite material will be exemplified. The soft magnetic composite materials in other shapes have the same properties and are not described in detail.
Example 1:
1) raw material preparation
Obtaining spherical Fe particles by a gas atomization method, wherein the spherical Fe particles are used as a magnetic main phase; the interface phase is Mn-Zn ferrite; mass fraction of Fe is 96 wt.%; the mass fraction of the Mn-Zn ferrite was 4 wt.%; the average grain diameter of Fe particles is 30 microns, and the average grain diameter of Mn-Zn ferrite is 20 nanometers;
2) insulating coating of soft magnetic alloy particles
Passivating the spherical Fe particles, and fully mixing the spherical Fe particles with the Mn-Zn ferrite to form mixed powder; so as to realize the insulating coating of the Mn-Zn ferrite on the spherical Fe particles; forming a magnetic oxide particle layer outside the spherical Fe particles;
3) magnetic field orientation molding
Putting the mixed powder in the step 2) into an annular die to be pressed into a magnetic ring, and applying an external magnetic field in the magnetic ring forming process, wherein the external magnetic field is parallel to the working magnetic circuit plane and is vertical to the working magnetic circuit plane; the magnetic field is generated by a coil; the magnetic field intensity is 0.1T; the arrangement of the Fe magnetic powder and the Mn-Zn ferrite in the magnetic ring is redistributed under the action of an external magnetic field;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the high-permeability low-loss soft magnetic composite material with non-uniform distribution of spherical soft magnetic alloy particles (spherical Fe particles) and magnetic oxides (Mn-Zn ferrite) is obtained.
FIG. 2 shows a scanning electron micrograph of a sample subjected to a magnetic field applied parallel to the plane of the working magnetic circuit; it can be found that the magnetic powder parallel to the working magnetic circuit direction is distributed continuously, and the arrangement is tighter than that perpendicular to the working magnetic circuit direction; the magnetic oxide forms good filling in the horizontal gaps of the soft magnetic alloy particles;
FIG. 3 shows a scanning electron micrograph of a sample that was not oriented by a magnetic field (for comparison); it can be seen that both the spherical soft magnetic alloy and the magnetic oxide form a good filling; the arrangement distribution of the spherical soft magnetic alloy and the magnetic oxide has no anisotropy;
FIG. 4 shows the effective permeability contrast curves for the samples of FIGS. 2 and 3; it can be found that the sample has higher permeability after orientation of the magnetic field parallel to the plane of the working magnetic circuit;
FIG. 5 shows the magnetic loss versus curve for the samples of FIGS. 2 and 3; it can be found that the sample has lower losses after orientation of the magnetic field parallel to the plane of the working magnetic circuit;
FIG. 6 shows a real part of the complex permeability versus the plot for the samples of FIGS. 2 and 3; it can be found that, after orientation of the magnetic field parallel to the plane of the working magnetic circuit, the sample has a higher real part of the complex permeability; FIG. 7 shows μ Q product versus curves for the samples of FIGS. 2 and 3; it can be found that after the orientation of the magnetic field parallel to the plane of the working magnetic circuit, the μ Q product of the sample is higher, showing better overall soft magnetic properties;
thus, it can be seen that the sample has higher permeability and lower loss after orientation of the magnetic field parallel to the plane of the working magnetic circuit during preparation.
Example 2:
1) raw material preparation
Obtaining spherical Fe-Si particles by a gas atomization method, wherein the spherical Fe-Si particles are used as a magnetic main phase; the interface phase is Ni-Zn ferrite; the mass fraction of spherical Fe-Si particles was 90 wt.%; the mass fraction of the Ni-Zn ferrite was 10 wt.%;
2) insulating coating of soft magnetic alloy particles
After being passivated, the spherical Fe-Si particles are fully mixed with Ni-Zn ferrite to form mixed powder, and the Ni-Zn ferrite realizes the insulation coating of the Fe-Si particles;
3) magnetic field orientation molding
Putting the mixed powder in the step 2) into an annular die to be pressed and molded into a magnetic ring, and applying an external magnetic field to carry out orientation in the molding process of the magnetic ring, wherein the magnetic field is generated by an electromagnet; the external magnetic field is parallel to the working magnetic circuit plane and vertical to the normal direction of the working magnetic circuit; the magnetic field intensity is 0.4T; the orientation of the external magnetic field ensures that the arrangement of the spherical Fe-Si magnetic powder and the Ni-Zn ferrite in the magnetic ring is redistributed;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The following table 1 shows the effective permeability and loss values of the Ni-Zn/Fe-Si soft magnetic composite material with and without magnetic field orientation parallel to the plane of the working magnetic circuit.
It can be found that the Ni-Zn/Fe-Si soft magnetic composite material after being oriented in a magnetic field parallel to the plane of the working magnetic circuit has high magnetic permeability and low loss.
Example 3:
1) raw material preparation
Obtaining spherical Fe-Ni particles by a gas atomization method, wherein the spherical Fe-Ni particles are used as a magnetic main phase; the interface phase is Mg-Zn ferrite; the mass fraction of spherical Fe-Ni particles was 92 wt.%; the mass fraction of Mg-Zn ferrite was 8 wt.%;
2) insulating coating of soft magnetic alloy particles
Passivating spherical Fe-Ni particles, and fully mixing the spherical Fe-Ni particles with Mg-Zn ferrite to form mixed powder; realizing the insulating coating of the Mg-Zn ferrite on the Fe-Ni particles;
3) magnetic field orientation molding
Putting the mixed powder obtained in the step 2) into an annular die to be pressed into a magnetic ring, and applying an external magnetic field for orientation in the magnetic ring forming process, wherein the external magnetic field is generated by an electromagnet; the external magnetic field is parallel to the working magnetic circuit plane and vertical to the normal direction of the working magnetic circuit; the magnetic field intensity is 0.6T; the arrangement of Fe-Ni magnetic powder and Mg-Zn ferrite in the magnetic ring is redistributed by an external magnetic field;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
Table 2 shows the effective permeability and loss values of Mg-Zn/Fe-Ni soft magnetic composite material oriented with the plane parallel to the working magnetic circuit applied and oriented without applying a magnetic field.
It can be found that the Mg-Zn/Fe-Ni soft magnetic composite material after being oriented in a magnetic field parallel to the plane of the working magnetic circuit has high magnetic permeability and low loss.
Example 4:
1) raw material preparation
Obtaining spherical Fe-Ni-Mo particles by a gas atomization method, wherein the spherical Fe-Ni-Mo particles are used as a magnetic main phase; the interface phase is Ni-Cu-Zn ferrite; the mass fraction of spherical Fe-Ni-Mo particles was 95 wt.%; the mass fraction of the Ni-Cu-Zn ferrite was 5 wt.%;
2) insulating coating of soft magnetic alloy particles
Passivating spherical Fe-Ni-Mo particles, and fully mixing the spherical Fe-Ni-Mo particles with Ni-Cu-Zn ferrite to form mixed powder; realizing the insulating coating of the Ni-Cu-Zn ferrite on Fe-Ni-Mo particles;
3) magnetic field orientation molding
Putting the mixed powder in the step 2) into an annular die to be pressed and molded into a magnetic ring, and applying an external magnetic field for orientation in the molding process of the magnetic ring, wherein the external magnetic field is generated by an electromagnet; the external magnetic field is parallel to the working magnetic circuit plane and vertical to the normal direction of the working magnetic circuit; the strength of the external magnetic field is 0.8T; the external magnetic field pair redistributes the arrangement of Fe-Ni-Mo magnetic powder and Ni-Cu-Zn ferrite in the magnetic ring
4) Stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The samples oriented with the horizontal magnetic field were tested to have higher permeability and lower magnetic loss.
Example 5:
1) raw material preparation
The magnetic main phase is spherical Fe-Si-Al particles, and the spherical Fe-Si-Al particles are obtained by a gas atomization method; the interphase being Co2Y plane hexaferrite; the mass fraction of spherical Fe-Si-Al particles was 97 wt.%; co2The mass fraction of Y-plane hexaferrite was 3 wt.%;
2) insulating coating of soft magnetic alloy particles
Passivating spherical Fe-Si-Al particles and then mixing with Co2Fully mixing Y plane hexaferrite to form mixed powder to realize Co2Insulating and coating the Fe-Si-Al particles by the Y plane hexagonal ferrite;
3) magnetic field orientation molding
Putting the mixed powder in the step 2) into an annular die to be pressed and molded into a magnetic ring, and applying an external magnetic field to carry out orientation in the molding process of the magnetic ring, wherein the magnetic field is generated by an electromagnet; the external magnetic field is parallel to the working magnetic circuit plane and is vertical to the normal direction of the working magnetic circuit plane; the magnetic field intensity is 1T; the external magnetic field makes the Fe-Si-Al magnetic powder and Co in the magnetic ring2The arrangement of the Y plane hexaferrite is redistributed;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The samples after being oriented parallel to the plane magnetic field of the working magnetic circuit were tested to have higher permeability and lower magnetic loss.
Example 6:
1) raw material preparation
The magnetic main phase is spherical Fe-Si-B amorphous particles; obtaining spherical Fe-Si-B amorphous particles by a water atomization method; the interphase being Co2A Z-plane hexaferrite; the mass fraction of the spherical Fe-Si-B amorphous particles was 98 wt.%; co2The mass fraction of Z-plane hexaferrite was 2 wt.%;
2) insulating coating of soft magnetic alloy particles
Passivating spherical Fe-Si-B amorphous particles and then mixing with Co2Fully mixing the Z-plane hexaferrite to form mixed powder; realization of Co2Insulating and coating the Fe-Si-B amorphous particles by the Z-plane hexagonal ferrite;
3) magnetic field orientation molding
Putting the mixed powder obtained in the step 2) into an annular die and pressing the mixed powder into a magnetic ring, and applying an external magnetic field in the magnetic ring forming process to redistribute the arrangement of the Fe-Si-B amorphous magnetic powder and the Co2Z planar hexagonal ferrite in the magnetic ring;
the magnetic field is generated by an electromagnet; the oriented magnetic field is parallel to the working magnetic circuit plane and is perpendicular to the normal direction of the working magnetic circuit plane; the magnetic field intensity is 2T;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The samples after being oriented parallel to the plane magnetic field of the working magnetic circuit were tested to have higher permeability and lower magnetic loss.
Example 7:
1) raw material preparation
The magnetic main phase is spherical iron-based nanocrystalline alloy particles, and the spherical iron-based nanocrystalline alloy particles are obtained by a water atomization method; the interface phase is Mn-Zn ferrite; the mass fraction of the spherical iron-based nanocrystalline alloy particles was 99 wt.%; the mass fraction of the Mn-Zn ferrite is 1 wt.%;
2) insulating coating of soft magnetic alloy particles
After being passivated, the spherical iron-based nanocrystalline alloy particles are fully mixed with Mn-Zn ferrite to obtain mixed powder, so that the Mn-Zn ferrite can be used for insulating and coating the iron-based nanocrystalline alloy particles;
3) magnetic field orientation molding
Putting the mixed powder obtained in the step 2) into an annular die, pressing and forming into a magnetic ring, and applying an external magnetic field in the magnetic ring forming process to redistribute the arrangement of the iron-based nanocrystalline alloy magnetic powder and the Mn-Zn ferrite in the magnetic ring;
the magnetic field is generated by a pulse magnetic field coil; the oriented magnetic field is parallel to the working magnetic circuit plane and perpendicular to the normal direction from the left magnetic circuit plane; the magnetic field intensity is 5T;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The samples after being oriented parallel to the plane magnetic field of the working magnetic circuit were tested to have higher permeability and lower magnetic loss.
Example 8:
1) raw material preparation
Obtaining spherical Fe particles by a gas atomization method, wherein the spherical Fe particles are used as a magnetic main phase; the interface phase is Ni-Zn ferrite; the mass fraction of spherical Fe particles was 99.9 wt.%; mass fraction of Ni-Zn ferrite 0.1 wt.%;
2) insulating coating of soft magnetic alloy particles
Passivating the spherical Fe particles, and fully mixing the spherical Fe particles with the Ni-Zn ferrite to form mixed powder; realizing the insulating coating of the Ni-Zn ferrite on the Fe particles;
3) magnetic field orientation molding
Putting the mixed powder in the step 2) into an annular die to be pressed and molded into a magnetic ring, and applying an external magnetic field in the molding process of the magnetic ring, wherein the external magnetic field redistributes the arrangement of spherical Fe particles and Ni-Zn ferrite in the magnetic ring;
the magnetic field is generated by a pulse magnetic field coil; the external magnetic field is parallel to the working magnetic circuit plane and is vertical to the normal direction of the working magnetic circuit plane; the magnetic field intensity is 10T;
4) stress relief annealing
After the soft magnetic composite magnetic ring is formed, further stress relief annealing is carried out, and hysteresis loss is reduced; finally, the soft magnetic composite material with high magnetic permeability and low loss, in which the soft magnetic alloy particles and the magnetic oxide are non-uniformly distributed, is obtained.
The samples after being oriented parallel to the plane magnetic field of the working magnetic circuit were tested to have higher permeability and lower magnetic loss.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (10)
1. The preparation method of the soft magnetic composite material with high magnetic conductivity and low loss is characterized in that: coating a magnetic oxide particle layer outside the spherical soft magnetic alloy particles to form mixed powder; filling the mixed powder into a die to press and form the mixed powder; applying an external magnetic field to the mixed powder in the molding process, wherein the external magnetic field is parallel to the working magnetic circuit plane and is perpendicular to the normal direction of the working magnetic circuit plane; stress relief annealing to obtain a soft magnetic composite material;
in the direction along the plane of the magnetic ring, the spherical soft magnetic alloy particles are arranged closely and orderly, and the magnetic oxide particles are preferably filled in the horizontal gap; the spherical soft magnetic alloy particles are arranged disorderly along the normal axis direction of the magnetic ring, and the filling amount of the magnetic oxide particles at the vertical gap is less;
the arrangement of the spherical soft magnetic alloy particles and the magnetic oxide particles in the magnetic ring enables the distribution of the spherical soft magnetic alloy particles and the magnetic oxide powder to have anisotropy in the magnetic ring.
2. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the magnetic field intensity is 0.1-10T.
3. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the magnetic field is one of a coil magnetic field, an electromagnet magnetic field or a pulse magnetic field.
4. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: and applying an external magnetic field all the time in the process of pressing and forming the mixed powder.
5. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the mass fraction of the spherical magnetically soft alloy particles is 90wt.% to 99.9 wt.%; the mass fraction of the magnetic oxide layer is 0.1wt.% to 10 wt.%.
6. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the spherical soft magnetic alloy particles are one of Fe, Fe-Si, Fe-Ni-Mo, Fe-Si-Al, Fe-Si-B amorphous and iron-based nanocrystalline alloys.
7. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the magnetic oxide layer is Mn-Zn ferrite, Ni-Zn ferrite, Mg-Zn ferrite, Ni-Cu-Zn ferrite, Co2Y plane hexaferrite, Co2One of Z-plane hexaferrites.
8. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the diameter of the spherical soft magnetic alloy particles is 5-40 mu m; the diameter of the magnetic oxide particles is 10 nm-200 nm.
9. The method of preparing a high permeability low loss soft magnetic composite material according to claim 1, wherein: the spherical magnetically soft alloy particles are prepared by an air atomization method or a water atomization method.
10. A magnetic ring of soft magnetic composite material with high magnetic conductivity and low loss is characterized in that: the magnetic ring comprises a magnetic ring body, wherein the magnetic ring body comprises spherical soft magnetic alloy particles and magnetic oxide particles;
the magnetic oxide particles are coated outside the spherical soft magnetic alloy particles, so that the magnetic oxide particles are distributed at the interfaces of the spherical soft magnetic alloy particles; in the direction along the plane of the magnetic ring, the spherical soft magnetic alloy particles are arranged closely and orderly, and the magnetic oxide particles are preferably filled in the horizontal gap; the spherical soft magnetic alloy particles are arranged disorderly along the normal axis direction of the magnetic ring, and the filling amount of the magnetic oxide particles at the vertical gap is less;
the arrangement of the spherical soft magnetic alloy particles and the magnetic oxide particles in the magnetic ring enables the distribution of the spherical soft magnetic alloy particles and the magnetic oxide powder to have anisotropy in the magnetic ring.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911188802.9A CN110853910B (en) | 2019-11-28 | 2019-11-28 | Preparation method of high-permeability low-loss soft magnetic composite material and magnetic ring thereof |
| JP2021569137A JP2022533727A (en) | 2019-11-28 | 2020-05-29 | Manufacturing method of high permeability, low loss soft magnetic composite material and its magnetic ring |
| PCT/CN2020/093242 WO2021103466A1 (en) | 2019-11-28 | 2020-05-29 | Method for preparing soft magnetic composite material with high magnetic conductivity and low loss, and magnet ring thereof |
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| CN201911188802.9A CN110853910B (en) | 2019-11-28 | 2019-11-28 | Preparation method of high-permeability low-loss soft magnetic composite material and magnetic ring thereof |
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| Publication Number | Publication Date |
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| CN110853910A CN110853910A (en) | 2020-02-28 |
| CN110853910B true CN110853910B (en) | 2021-05-28 |
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| CN113066627B (en) * | 2021-02-26 | 2023-10-20 | 广东省科学院新材料研究所 | Composite magnetic powder core and preparation method thereof |
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| CN106373693A (en) * | 2016-11-15 | 2017-02-01 | 彭晓领 | Method for preparing complete orientation soft magnetic composite material |
| CN108335820A (en) * | 2018-02-23 | 2018-07-27 | 同济大学 | Stablize the magnetic powder core material and preparation method thereof of magnetic conductivity and low loss |
| CN108987025A (en) * | 2018-06-11 | 2018-12-11 | 彭晓领 | A kind of high magnetic conductivity and low loss soft-magnetic composite material and preparation method thereof |
| CN109273234A (en) * | 2018-09-26 | 2019-01-25 | 鲁东大学 | A kind of heterogeneous nucleation method for coating of high saturation magnetic flux density soft-magnetic composite material |
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