Preparation method of ultra-fine grain high-temperature-resistant high-frequency manganese zinc ferrite

A manganese-zinc-ferrite, high-temperature-resistant technology, used in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of poor high-temperature characteristics and large high-frequency losses, and achieve enhanced high-temperature characteristics and high-frequency losses. Small, loss-reducing effect

Pending Publication Date: 2021-11-09
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Abstract
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Problems solved by technology

MnZn ferrite produced by the existing preparation process has defects su

Method used

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  • Preparation method of ultra-fine grain high-temperature-resistant high-frequency manganese zinc ferrite

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[0023] Example 1:

[0024] To Fe 2 O 3 , MnO 2 , ZnO as the main raw material, SnO 2 Compounding, Fe as an auxiliary raw material 2 O 3 Content of 53mol%, MnO 2 Content of 36mol%, ZnO content of 11mol%, SnO 2 Content 0.001wt%; after the completion of a dosing ball, speed 220 revolutions / minute, 2H milling time; raw material after the primary calcined milling process, calcining temperature 850 ℃, 2H holding time; after the completion of doping, doping miscellaneous CaCO 3 Content 0.01wt%, V 2 O 5 Content of 0.01wt%, TiO 2 Content 0.1wt%, Co 2 O 3 Content of 0.2wt%; the obtained raw secondary milling, speed 220 revolutions / minute, 3H milling time; after the second milling was complete, granulated 10PVA; pre rt followed by press molding, the applied pressure of 3MPa; after alternating horizontal and vertical deformation temperature, a temperature of 1000 ℃, a compression strain of 5%, the number of horizontal and vertical deformation of 10 times; followed by press molding tempera...

Example Embodiment

[0025] Example 2:

[0026] To Fe 2 O 3 , MnO 2 , ZnO as the main raw material, SnO 2 Compounding, Fe as an auxiliary raw material 2 O 3 Content of 56mol%, MnO 2 Content of 36mol%, ZnO content 8mol%, SnO 2 Content 0.005wt%; after completion of a dosing ball, speed 250 revolutions / minute, 3H milling time; primary raw material calcined after ball milling process, calcining temperature 950 deg.] C, holding time 3H; After completion of the doping, doping miscellaneous CaCO 3 Content 0.1wt%, V 2 O 5 Content 0.001wt%, TiO 2 Content 0.2wt%, Co 2 O 3 Content of 0.4wt%; the obtained raw secondary milling, speed 250 revolutions / minute, 5H milling time; after completion of the second milling, granulation was added 15% PVA; pre rt followed by press molding, the applied pressure 4MPa; followed by alternating horizontal and vertical high temperature deformation temperature of 1100 ℃, 15% compression deformation, the number of horizontal and vertical deformation of the respective four times; ...

Example Embodiment

[0027] Example 3:

[0028] To Fe 2 O 3 , MnO 2 , ZnO as the main raw material, SnO 2 Compounding, Fe as an auxiliary raw material 2 O 3 Content of 55mol%, MnO 2 Content of 33mol%, ZnO content of 12mol%, SnO 2 Content 0.003wt%; after completion of a dosing ball, speed 230 revolutions / minute, for 2.5 h milling time; primary raw material calcined after ball milling process, calcining temperature 900 ℃, holding time for 2.5 h; after the completion of doping doping CaCO 3 Content 0.05wt%, V 2 O 5 Content 0.005wt%, TiO 2 Content 0.15wt%, Co 2 O 3 Content of 0.3wt%; the obtained raw secondary milling, speed 230 revolutions / minute, 4H milling time; after completion of the second milling, granulation was added 12% PVA; pre rt followed by press molding, the applied pressure 3.5MPa; followed by alternating horizontal and vertical deformation temperature, a temperature of 1050 deg.] C, 10% compression deformation, the number of horizontal and vertical deformation of all 8 times; followed ...

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Abstract

The invention discloses a preparation method of ultra-fine grain high-temperature-resistant high-frequency manganese zinc ferrite, which mainly comprises the following steps: taking Fe2O3, MnO2 and ZnO as main raw materials, taking SnO2 as an auxiliary raw material, proportioning, carrying out primary ball milling, pre-sintering, doping CaCO3, V2O5, TiO2 and Co2O3, carrying out secondary ball milling, adding PVA, granulating, pre-pressurizing and forming at room temperature, deforming at high temperature, pressurizing and forming at high temperature, sintering, and quenching and cooling to obtain the manganese zinc ferrite. According to the invention, SnO2 is used as an auxiliary raw material, and Sn can enter the crystal lattice of the manganese zinc ferrite, so that transition of electrons at high temperature and high frequency is hindered, and loss is reduced; CaCO3, V2O5, TiO2 and Co2O3 are adopted for doping, impurity elements are enriched in a grain boundary, the grain boundary resistivity is increased, and loss is reduced; high-temperature compression deformation is adopted, deformation storage energy is provided, crystal grain forming positions are increased, then crystal grains are refined, and loss is reduced; and by adopting quenching cooling, element diffusion in the cooling process is reduced, and the high-temperature characteristic of the ferrite is enhanced. The obtained manganese zinc ferrite has the advantages of ultra-fine grains, high saturation flux density, high temperature resistance and low high-frequency loss.

Description

technical field [0001] The invention relates to the field of high-frequency manganese-zinc ferrite preparation. Background technique [0002] In the 5G era, electronic devices are constantly developing towards higher frequencies. The high-frequency characteristics of soft ferrites represented by manganese-zinc ferrite and the high-frequency and low-loss characteristics at high temperatures caused by device heating are particularly important. In addition, increasing the operating frequency is conducive to reducing the volume and weight of the magnetic core, and is conducive to the miniaturization and light weight of the device. [0003] At present, the preparation of high-frequency manganese-zinc ferrite applied to 2~4MHz has become a technical difficulty. The manganese-zinc ferrite produced by the existing preparation process has defects such as large high-frequency loss and poor high-temperature characteristics. Contents of the invention [0004] The present invention o...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01F1/34H01F41/02
CPCC04B35/2658C04B35/622H01F1/344H01F41/02C04B2235/3208C04B2235/3232C04B2235/3239C04B2235/3275C04B2235/6567C04B2235/6565C04B2235/786
Inventor 唐少春赵宇飞
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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