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Ferrites soft magnetic powder core and preparation method thereof

A soft magnetic powder core and ferrite technology, applied in the field of magnetic powder cores, can solve the problems of insufficient saturation magnetic flux density and initial magnetic permeability, low saturation magnetic flux density and effective magnetic permeability, and failure to meet application requirements. Achieve the effects of increased effective magnetic permeability, high effective magnetic permeability, and improved quality factor

Active Publication Date: 2019-04-09
陕西汇锋电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the application of transformers and inductors in power supplies with operating frequencies above MHz, manganese-zinc ferrite magnetic powder or nickel-zinc ferrite magnetic powder with good high-frequency characteristics can be used to prepare high-frequency magnetic powder cores with low magnetic permeability, but for several The application of transformers and inductors in power supplies with operating frequencies above 100 kHz is not very suitable, because the saturation magnetic flux density and initial permeability of this type of soft magnetic material are far inferior to those of soft magnetic powder cores or soft magnetic alloy powder cores. The saturation magnetic flux density and initial magnetic permeability of the magnetic powder core, and the process characteristics of the magnetic powder core lead to a relatively low saturation magnetic flux density and effective magnetic permeability of the magnetic powder core, which cannot meet the application requirements of hundreds of kilohertz, and the price is also low. will be higher

Method used

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preparation example Construction

[0031] The present invention also provides a method for preparing a ferrite soft magnetic powder core, comprising the following steps:

[0032] (1) Ingredients: Weigh 40% to 99.9% of ferrite soft magnetic material powder and 0.1% to 10% of highly reducible metal powder and 0% to 50% of organic or inorganic insulating adhesive by weight percentage dispersant and 0% to 10% organic or inorganic dispersant to obtain a magnetic mixture, fully stirred, and the magnetic powder particles in the magnetic mixture are fully covered;

[0033] (2) Molding: put the mixture obtained in the above step (1) into a mold, and press the powder under a pressure of 0.5 to 3 GPa;

[0034] (3) Heat treatment: Put the magnetic powder core obtained by compression molding in the above step (2) into a high-temperature furnace filled with air or vacuum or inert gas for heat treatment. The temperature of the high-temperature furnace is set in the range of 300°C-1000°C, and the heat treatment time is at leas...

Embodiment 1

[0038] According to the preparation method of the above-mentioned ferrite soft magnetic powder core, it is 97.5% by weight to take manganese zinc ferrite soft magnetic powder with a particle size of 150 mesh and 0.1% by weight to take a particle size of 1000 mesh. Strong aluminum powder and the high-temperature silica gel insulating binder weighed as 2.4% by weight are mixed to obtain a magnetic mixture. After fully stirring, the magnetic mixture powder is put into a mold, and the powder is pressed and molded under a pressure of 2GPa, and the molded The magnetic powder core is heat-treated in a high-temperature furnace with air. The temperature of the high-temperature furnace is set at 500°C, and the heat treatment time is 1 hour, so that the highly reducible aluminum and the divalent iron in the ferrite soft magnetic material undergo a sufficient replacement reaction. , so that the magnetic powder core contains oxide components of iron and aluminum, and a ferrite soft magnetic p...

Embodiment 2

[0040] According to the preparation method of the above-mentioned ferrite soft magnetic powder core, it is 99.5% by weight to take manganese zinc ferrite soft magnetic powder with a particle size of 150 mesh and take 0.1% by weight to take a particle size of 1000 mesh for reduction Strong aluminum powder and the water glass insulating binder that weighed 0.4% by weight are mixed to obtain a magnetic mixture. After fully stirring, the magnetic mixture powder is put into a mold, and the powder is pressed into a mold under a pressure of 2GPa. The formed magnetic powder core is heat-treated in a high-temperature furnace with air. The temperature of the high-temperature furnace is set at 500°C, and the heat treatment time is 1 hour, so that the highly reducible aluminum and the divalent iron in the ferrite soft magnetic material are fully replaced. reaction, so that the magnetic powder core contains iron and aluminum oxide components, and a ferrite soft magnetic powder core within t...

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Abstract

The invention discloses a magnetic powder core based on ferrites soft magnetic material. The magnetic powder core is formed by coating metal powder with strong power adding reducibility in an insulating manner, performing compression molding, and then performing thermal treatment; the ingredients of the magnetic powder core at least comprise the ferrite soft magnetic material, iron, metal with strong reducibility, and oxide of the metal with strong reducibility, and can comprise organic or inorganic insulating adhesive and organic or inorganic dispersion agent. The ferrites soft magnetic powder core prepared through the method provided by the invention can improve the effective magnetic conductivity and the quality factor of the magnetic powder core and improve the resistivity of the magnetic powder core, and can effectively reduce the eddy current loss under high frequency, and the magnetic powder core has good high-frequency characteristic and temperature stability.

Description

technical field [0001] The invention relates to the technical field of magnetic components, in particular to a magnetic powder core formed by adding metal powder with strong reducibility based on ferrite soft magnetic material powder, insulating coating, compression molding, and heat treatment. Background technique [0002] At present, magnetic powder cores are widely used in various switching power supplies as magnetic components for filter inductors, choke inductors, and energy storage inductors. Magnetic powder cores mainly include iron powder cores, permalloy powder cores, iron-nickel alloy powder cores, iron-silicon Alloy powder cores, silicon aluminum alloy powder cores, etc. Among them, the price of iron powder cores is relatively low, but the eddy current loss is high in high frequency applications. Although other types of magnetic powder cores have moderate or better high frequency characteristics, their prices are slightly higher or equivalent Expensive, which limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/37
CPCH01F1/37
Inventor 汤能文鲁忠渝冯锦超王修洪光岱
Owner 陕西汇锋电子科技有限责任公司
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