CN113674942B - Wide-temperature-range high-frequency magnetic material and preparation method and application thereof - Google Patents

Wide-temperature-range high-frequency magnetic material and preparation method and application thereof Download PDF

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CN113674942B
CN113674942B CN202110984616.7A CN202110984616A CN113674942B CN 113674942 B CN113674942 B CN 113674942B CN 202110984616 A CN202110984616 A CN 202110984616A CN 113674942 B CN113674942 B CN 113674942B
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CN113674942A (en
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杨明雄
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Guangdong Fanrui New Material Co ltd
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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
    • 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

Abstract

The invention discloses a wide-temperature high-frequency magnetic material and a preparation method and application thereof. The composition of the wide-temperature high-frequency magnetic material comprises seven layers of coated Fe2O3、SnO2And ZrO2The preparation method comprises the following steps: 1) preparation of Single layer coated Fe2O3(ii) a 2) Preparation of ZnO-NiO-TiO2‑Co2O3Filled single layer clad Fe2O3(ii) a 3) Preparation of three-layer coated Fe2O3(ii) a 4) Preparation of seven-layer coated Fe2O3(ii) a 5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing, ball milling and drying to obtain the wide-temperature high-frequency magnetic material. The wide-temperature high-frequency magnetic material has fine and uniform grain size, the use frequency can reach more than 3MHz, the loss at high temperature can be reduced by more than 15% compared with the conventional ferrite, and the requirements of devices on high frequency, large current and low power consumption in a larger temperature range at high temperature can be met.

Description

Wide-temperature-range high-frequency magnetic material and preparation method and application thereof
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a wide-temperature high-frequency magnetic material and a preparation method and application thereof.
Background
With the rapid development of the rapid charging technology, the output power of the charging head of the mobile phone has risen sharply from 5W to 120W at most, the frequency has also risen from 100kHz to as high as 3MHz, and with the rise of the output power, the heat generation of the device is more serious, and the temperature stability is very important for the device. A high-frequency large-current charging scheme is one of the commonly used rapid charging schemes, and the performance and safety of a mobile phone charging head can be directly determined by whether the magnetic core can keep low power consumption in a larger temperature range under the conditions of high frequency, large current and high temperature.
The foregoing merely provides background information related to the present invention and does not necessarily constitute prior art.
Disclosure of Invention
One of the objects of the present invention is to provide a magnetic material that can satisfy the requirements of a device for high frequency, large current, large temperature range at high temperature, and low power consumption.
The second objective of the present invention is to provide a method for preparing the magnetic material.
The invention also aims to provide an application of the magnetic material.
The technical scheme adopted by the invention is as follows:
a wide-temp. high-frequency magnetic material is composed of seven layers of Fe coated by Fe2O3、SnO2And ZrO2Seven-layer coated Fe2O3Is sequentially Fe from inside to outside2O3Inner core, porous MnO-Fe2O3Layer, ZnO layer, first SiO2Layer, second SiO2Layer, Bi2O3Layer, SnO2Layer and Nb2O5Layer, porous MnO-Fe2O3The holes of the layer are filled with ZnO, NiO and TiO2And Co2O3。
Preferably, the seven layers coat Fe2O3、SnO2、ZrO2The mass ratio of (A) is 1: 0.0001-0.001: 0.0005-0.005.
Preferably, said Fe2O3The average grain diameter of the inner core is 0.1-0.3 μm.
Preferably, the second SiO2The thickness of the layer is 3nm to 5 nm.
Preferably, said Bi2O3The thickness of the layer is 0.5nm to 1 nm.
Preferably, the SnO2The thickness of the layer is 1nm to 2 nm.
Preferably, said Nb2O5The thickness of the layer is 1nm to 2 nm.
The preparation method of the wide-temperature high-frequency magnetic material comprises the following steps:
1) MnO and Fe2O3Co-deposited on Fe2O3Surface of the powder to form porous MnO-Fe2O3Layer to obtain single-layer coated Fe2O3；
2) ZnO, NiO and TiO2And Co2O3Deposited on a single layer of clad Fe2O3In the pores of the porous material to obtain ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3；
3) Mixing ZnO and SiO2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3The surface of the glass is coated with a coating,obtaining three-layer coated Fe2O3；
4) Mixing SiO2、Bi2O3、SnO2And Nb2O5Sequentially depositing on three layers of coated Fe2O3Performing heat treatment on the surface to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing, ball milling and drying to obtain the wide-temperature high-frequency magnetic material.
Preferably, the single layer of Fe coated in step 1) is2O3The MnO accounts for 42-45% by mass.
Preferably, the addition amount of ZnO in the step 2) is single-layer coated Fe2O32 to 3 percent of the mass.
Preferably, the addition amount of the NiO in the step 2) is single-layer coated Fe2O30.1-0.3% of the mass.
Preferably, the TiO in the step 2)2Is added in a single layer coating Fe2O30.1-0.3% of the mass.
Preferably, the Co of step 2)2O3Is added in a single layer coating Fe2O30.01-0.1% of the mass.
Preferably, the addition amount of the ZnO in the step 3) is ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O32.5-3.5% of the mass.
Preferably, the SiO in step 3)2The addition amount of the ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O30.1-0.3% of the mass.
Preferably, the heat treatment in the step 4) is carried out at 800-950 ℃, and the treatment time is 2-5 h.
Preferably, the ball milling time in the step 5) is 1-3 h.
The invention has the beneficial effects that: the wide-temperature high-frequency magnetic material has fine and uniform grain size, the use frequency can reach more than 3MHz, the loss at high temperature can be reduced by more than 15% compared with the conventional ferrite, and the requirements of devices on high frequency, large current and low power consumption in a larger temperature range at high temperature can be met.
Drawings
FIG. 1 is a graph showing permeability curves of the porcelain rings of examples 1 to 4 and comparative examples 1 to 2.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a wide-temperature high-frequency magnetic material is prepared by the following steps:
1) fe having an average particle diameter of 0.3 μm by electrochemical coprecipitation2O3Co-precipitation of MnO and Fe on the surface of the powder2O3Form porous MnO-Fe2O3Layer to obtain single-layer coated Fe2O3(MnO content 42% by mass);
2) coating a single layer with Fe by chemical vapor deposition2O3ZnO of 3% by mass, in a single layer of coated Fe2O3NiO with the mass of 0.3 percent and single-layer coated Fe2O3TiO 0.3% by mass2And a single layer of clad Fe2O30.1% by mass of Co2O3Deposited on porous MnO-Fe2O3In the pores of the layer, ZnO-NiO-TiO is obtained2-Co2O3Filled single layer clad Fe2O3；
3) ZnO-NiO-TiO is subjected to chemical vapor deposition2-Co2O3Filled single layer clad Fe2O3ZnO accounting for 3.5 percent of the mass and ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3SiO 0.3% by mass2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3Surface to obtain three-layer coated Fe2O3；
4) Coating three layers with Fe by chemical vapor deposition2O3Sequentially depositing SiO with the thickness of 5nm on the surface2Layer of Bi of thickness 1nm2O3Layer, SnO with thickness of 2nm2Layer and Nb with thickness of 2nm2O5Layer by layer, then the treatment is carried out for 2 hours at 950 ℃ to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing according to the mass ratio of 1:0.001:0.005, performing ball milling for 2h, and drying at 120 ℃ for 2h to obtain the wide-temperature high-frequency magnetic material.
Preparing a ceramic ring:
the wide-temperature high-frequency magnetic material of the present example and polyvinyl alcohol resin (number average molecular weight 35000g/mol) were mixed at a mass ratio of 1:0.06, and then spray-granulated in a spray tower to obtain granules having a particle size of 30 μm to 180 μm, and further 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and then the ceramic ring blank is processed for 3 hours at 1300 ℃ in the air atmosphere to obtain the ceramic ring.
Example 2:
a wide-temperature high-frequency magnetic material is prepared by the following steps:
1) fe having an average particle diameter of 0.1 μm by electrochemical coprecipitation2O3Co-precipitation of MnO and Fe on the surface of the powder2O3Form porous MnO-Fe2O3Layer to obtain single-layer coated Fe2O3(MnO content by mass is 45%);
2) coating a single layer with Fe by chemical vapor deposition2O3ZnO 2% by mass and Fe in a single layer2O3NiO accounting for 0.1 percent of mass and accounting for single-layer coated Fe2O3TiO 0.1% by mass2And a single layer of clad Fe2O30.01% by mass of Co2O3Deposited on porous MnO-Fe2O3In the pores of the layer, ZnO-NiO-TiO is obtained2-Co2O3Filled single layer clad Fe2O3；
3) ZnO-NiO-TiO is subjected to chemical vapor deposition2-Co2O3Filling sheetLayer coated Fe2O3ZnO accounting for 2.5 percent of the mass and ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3SiO 0.1% by mass2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3Surface to obtain three-layer coated Fe2O3；
4) Coating three layers with Fe by chemical vapor deposition2O3Sequentially depositing SiO with the thickness of 3nm on the surface2Layer of Bi of thickness 0.5nm2O3SnO of layer thickness 1nm2Layer and Nb with thickness of 1nm2O5Layer by layer, then the treatment is carried out for 5 hours at 800 ℃ to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing according to the mass ratio of 1:0.0001:0.001, ball-milling for 2h, and drying at 120 ℃ for 2h to obtain the wide-temperature high-frequency magnetic material.
Preparing a ceramic ring:
the wide-temperature high-frequency magnetic material of the present example and polyvinyl alcohol resin (number average molecular weight 35000g/mol) were mixed at a mass ratio of 1:0.06, and then spray-granulated in a spray tower to obtain granules having a particle size of 30 μm to 180 μm, and further 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and then the ceramic ring blank is processed for 3 hours at 1200 ℃ in the air atmosphere to obtain the ceramic ring.
Example 3:
a wide-temperature high-frequency magnetic material is prepared by the following steps:
1) fe having an average particle diameter of 0.2 μm by electrochemical coprecipitation2O3Co-precipitation of MnO and Fe on the surface of the powder2O3Form porous MnO-Fe2O3Layer to obtain single-layer coated Fe2O3(MnO 43.5% by mass);
2) coating a single layer with Fe by chemical vapor deposition2O3ZnO accounting for 2.5 percent of the mass and single-layer coated Fe2O30.2% by mass ofNiO, single layer coated Fe2O3TiO 0.2% by mass2And a single layer of clad Fe2O30.05% by mass of Co2O3Deposited on porous MnO-Fe2O3In the pores of the layer, ZnO-NiO-TiO is obtained2-Co2O3Filled single layer clad Fe2O3；
3) ZnO-NiO-TiO is subjected to chemical vapor deposition2-Co2O3Filled single layer clad Fe2O3ZnO 3% by mass and ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3SiO 0.2% by mass2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3Surface to obtain three-layer coated Fe2O3；
4) Coating three layers with Fe by chemical vapor deposition2O3Sequentially depositing SiO with the thickness of 4nm on the surface2Layer of Bi of 0.7nm thickness2O3Layer, SnO with thickness of 1.5nm2Layer and Nb with thickness of 1.5nm2O5Layer by layer, then the treatment is carried out for 3 hours at 900 ℃ to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing according to the mass ratio of 1:0.0005:0.0005, performing ball milling for 2h, and drying at 120 ℃ for 2h to obtain the wide-temperature high-frequency magnetic material.
Preparing a ceramic ring:
the wide-temperature high-frequency magnetic material of the present example and polyvinyl alcohol resin (number average molecular weight 35000g/mol) were mixed at a mass ratio of 1:0.06, and then spray-granulated in a spray tower to obtain granules having a particle size of 30 μm to 180 μm, and further 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and then the ceramic ring blank is processed for 3 hours at 1250 ℃ in the air atmosphere to obtain the ceramic ring.
Example 4:
a wide-temperature high-frequency magnetic material is prepared by the following steps:
1) fe having an average particle diameter of 0.15 μm by electrochemical coprecipitation2O3Co-precipitation of MnO and Fe on the surface of the powder2O3Form porous MnO-Fe2O3Layer to obtain single-layer coated Fe2O3(MnO content by mass is 44%);
2) coating a single layer with Fe by chemical vapor deposition2O3ZnO accounting for 2.3 percent of the mass and single-layer coated Fe2O3NiO accounting for 0.2 percent of mass and accounting for single-layer coated Fe2O3TiO 0.18% by mass2And a single layer of clad Fe2O30.03% by mass of Co2O3Deposited on porous MnO-Fe2O3In the pores of the layer, ZnO-NiO-TiO is obtained2-Co2O3Filled single layer clad Fe2O3；
3) ZnO-NiO-TiO is subjected to chemical vapor deposition2-Co2O3Filled single layer clad Fe2O3ZnO accounting for 2.8 percent of the mass and ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3SiO 0.13% by mass2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3Surface to obtain three-layer coated Fe2O3；
4) Coating three layers with Fe by chemical vapor deposition2O3Sequentially depositing SiO with the thickness of 3.5nm on the surface2Layer of Bi of 0.8nm thickness2O3Layer, SnO with thickness of 1.6nm2Layer and Nb with thickness of 1.2nm2O5Layer by layer, then the layer is processed for 4 hours at 870 ℃ to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing according to the mass ratio of 1:0.0003:0.0015, carrying out ball milling for 2h, and drying at 120 ℃ for 2h to obtain the wide-temperature high-frequency magnetic material.
Preparing a ceramic ring:
the wide-temperature high-frequency magnetic material of the present example and polyvinyl alcohol resin (number average molecule) were mixed35000g/mol) at a mass ratio of 1:0.06, spray granulating in a spray tower to obtain granules with a particle diameter of 30-180 μm, and 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and the ceramic ring blank is processed for 3 hours at 1230 ℃ in air atmosphere to obtain the ceramic ring.
Comparative example 1:
a magnetic material, the preparation method of which comprises the following steps:
1) 58 parts by mass of Fe2O342 parts by mass of MnO, 6.5 parts by mass of ZnO, 0.3 part by mass of NiO and 0.3 part by mass of TiO20.1 part by mass of Co2O3And 0.3 part by mass of SiO2Adding the mixture into a ball mill, performing ball milling for 5 hours, drying the mixture for 8 hours at 120 ℃, treating the mixture for 4 hours in an air atmosphere at 900 ℃, and crushing the mixture until the particle size is 1.0-1.5 microns to obtain mixed powder;
2) mixing the powder and SnO2And ZrO2Mixing according to the mass ratio of 1:0.001:0.005, performing ball milling for 2h, and drying at 120 ℃ for 2h to obtain the magnetic material.
Preparing a ceramic ring:
the magnetic material of the comparative example and polyvinyl alcohol resin (number average molecular weight 35000g/mol) were mixed at a mass ratio of 1:0.06, and then spray-granulated in a spray tower to obtain granules having a particle size of 30 μm to 180 μm, and further 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and then the ceramic ring blank is processed for 3 hours at 1300 ℃ in the air atmosphere to obtain the ceramic ring.
Comparative example 2:
a magnetic material, the preparation method of which comprises the following steps:
1) 55 parts by mass of Fe2O345 parts by mass of MnO, 4.5 parts by mass of ZnO, 0.1 part by mass of NiO, and 0.1 part by mass of TiO20.01 parts by mass of Co2O3And 0.1 part by mass of SiO2Adding the mixture into a ball mill, performing ball milling for 5 hours, drying the mixture for 8 hours at 120 ℃, treating the mixture for 4 hours in an air atmosphere at 900 ℃, and crushing the mixture until the particle size is 1.0-1.5 microns to obtain mixed powder;
2) mixing the powder and SnO2And ZrO2Mixing according to the mass ratio of 1:0.0001:0.001, ball-milling for 2h, and drying at 120 ℃ for 2h to obtain the magnetic material.
Preparing a ceramic ring:
the magnetic material of the comparative example and polyvinyl alcohol resin (number average molecular weight 35000g/mol) were mixed at a mass ratio of 1:0.06, and then spray-granulated in a spray tower to obtain granules having a particle size of 30 μm to 180 μm, and further 200kg/cm2The outer diameter of the ceramic ring blank is 14.6mm, the inner diameter is 9mm, the height is 3.5mm, and then the ceramic ring blank is processed for 3 hours at 1300 ℃ in the air atmosphere to obtain the ceramic ring.
And (3) performance testing:
1) the permeability curves of the porcelain rings of examples 1 to 4 and comparative examples 1 to 2 are shown in FIG. 1.
As can be seen from fig. 1: the ceramic rings of the embodiments 1 to 4 can maintain stable magnetic permeability in the frequency range of 3MHz to 4MHz, which shows that the use frequency of the wide-temperature high-frequency magnetic material of the present invention can reach 3MHz or more.
2) The performance of the ceramic rings of examples 1 to 4 and comparative examples 1 to 2 was tested, and the test results are shown in the following table:
TABLE 1 ceramic Ring Performance test results
Figure BDA0003230218120000061
Note:
magnetic permeability: testing by adopting a precise electromagnetic analyzer 3260B, wherein the testing frequency is 3 MHz;
inductance reduction rate/2A current: testing by adopting a precise electromagnetic analyzer 3260B, wherein the testing frequency is 3 MHz;
pcv (core loss power): a hysteresis loop analyzer SY8218 is adopted for testing, and the testing conditions are 500kHz and 50 mT;
saturation magnetic flux density: a hysteresis loop analyzer SY8218 is adopted for testing, and the testing conditions are 1kHz and 1194A/m;
resistivity: and testing by using a volume surface resistivity tester.
As can be seen from Table 1: the loss of the ceramic rings of the embodiments 1 to 4 at different temperatures is lower than that of the ceramic rings of the comparative examples 1 to 2, and the direct current superposition performance is slightly better than that of the ceramic rings of the comparative examples 1 to 2, so that the ceramic rings have more advantages in practical high-frequency large-current application.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (8)

1. A wide temperature high frequency magnetic material is characterized in that: the wide-temperature high-frequency magnetic material comprises seven layers of coated Fe2O3、SnO2And ZrO2(ii) a The seven layers of coated Fe2O3Is sequentially Fe from inside to outside2O3Inner core, porous MnO-Fe2O3Layer, ZnO layer, first SiO2Layer, second SiO2Layer, Bi2O3Layer, SnO2Layer and Nb2O5A layer; the porous MnO-Fe2O3The holes of the layer are filled with ZnO, NiO and TiO2And Co2O3(ii) a The seven layers of coated Fe2O3、SnO2、ZrO2In a mass ratio of 1:0.0001 to 0.001:0.0005 to 0.005; said Fe2O3The average particle size of the kernels is 0.1-0.3 mu m; the second SiO2The thickness of the layer is 3nm to 5 nm; the Bi2O3The thickness of the layer is 0.5nm to 1 nm; the SnO2The thickness of the layer is 1nm to 2 nm; the Nb2O5The thickness of the layer is 1nm to 2 nm.
2. The method for preparing a wide temperature range high frequency magnetic material according to claim 1, comprising the steps of:
1) MnO and Fe2O3Co-deposited on Fe2O3Porous MnO + is formed on the surface of the powderFe2O3Layer to obtain single-layer coated Fe2O3；
2) ZnO, NiO and TiO2And Co2O3Deposited on a single layer of clad Fe2O3In the pores of the porous material to obtain ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3；
3) Mixing ZnO and SiO2Sequentially deposited on ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O3Surface to obtain three-layer coated Fe2O3；
4) Mixing SiO2、Bi2O3、SnO2And Nb2O5Sequentially depositing on three layers of coated Fe2O3Performing heat treatment on the surface to obtain seven layers of coated Fe2O3；
5) Coating seven layers with Fe2O3Crushing and then mixing with SnO2And ZrO2Mixing, ball milling and drying to obtain the wide-temperature high-frequency magnetic material.
3. The method for preparing a wide-temperature high-frequency magnetic material according to claim 2, wherein: step 1) the single layer coating of Fe2O3The MnO accounts for 42-45% by mass.
4. The method for producing a wide-temperature high-frequency magnetic material according to claim 2 or 3, characterized in that: step 2) adding the ZnO into the single-layer coated Fe2O32-3% of the mass; the addition amount of the NiO in the step 2) is single-layer coated Fe2O30.1-0.3% of the mass; step 2) the TiO2Is added in a single layer coating Fe2O30.1-0.3% of the mass; step 2) said Co2O3Is added in a single layer coating Fe2O30.01-0.1% of the mass.
5. The method for preparing a wide-temperature high-frequency magnetic material according to claim 2 or 3The method is characterized in that: the addition amount of the ZnO in the step 3) is ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O32.5-3.5% of the mass; step 3) SiO2The addition amount of the ZnO-NiO-TiO2-Co2O3Filled single layer clad Fe2O30.1-0.3% of the mass.
6. The method for producing a wide-temperature high-frequency magnetic material according to claim 2 or 3, characterized in that: and 4) carrying out heat treatment at 800-950 ℃ for 2-5 h.
7. The method for producing a wide-temperature high-frequency magnetic material according to claim 2 or 3, characterized in that: the ball milling time in the step 5) is 1-3 h.
8. Use of the wide temperature range high frequency magnetic material of claim 1 in the preparation of magnetic cores.
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WO2008048716A2 (en) * 2006-06-06 2008-04-24 Cornell Research Foundation, Inc. Nanostructured metal oxides comprising internal voids and methods of use thereof
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