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Manganese zinc ferrite material and preparation method thereof

A technology of manganese-zinc ferrite and zinc oxide is applied in the field of manganese-zinc ferrite material and its preparation, which can solve the problems of large microscopic grain size of magnetic core, disappearance of low power consumption characteristics, large eddy current loss, etc.

Active Publication Date: 2015-03-25
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the operating frequency exceeds 200kHz, since the microscopic grain size of this type of magnetic core is relatively large, generally above 10um, the eddy current loss at high frequencies will be large, and its low power consumption characteristics at low frequencies will be gradually disappear, which will lead to a significant decrease in the conversion efficiency of the switching power supply
Existing MnZn ferrite materials cannot achieve low loss characteristics in the (0.1-1) MHz wide frequency range, and the ferrite materials currently used in (0.1-1) MHz can only be used in a relatively narrow frequency range In order to achieve very good low loss characteristics, it is necessary to produce a variety of different materials to correspond to the application requirements of different frequency bands in the (0.1 ~ 1) MHz range

Method used

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  • Manganese zinc ferrite material and preparation method thereof
  • Manganese zinc ferrite material and preparation method thereof

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preparation example Construction

[0029] The preparation method of the manganese zinc ferrite material of one embodiment, comprises the following steps:

[0030] Step S110, in molar percentage, mix 54%-56% of ferric oxide, 38%-42% of manganese tetroxide and 4%-6% of zinc oxide, and then stir slurry, sand mill, stir and add The glue is used to obtain a slurry, and the slurry is spray-dried to obtain a powder.

[0031] Preferably, the agitated pulp is mechanically agitated and paddled by a stirring tank.

[0032] Preferably, in the operation of stirring the pulp, add deionized water to stir the pulp, the mass ratio of the total amount of ferric oxide, trimanganese tetroxide and zinc oxide to deionized water is 1:0.7~0.9, the stirred The time is 60 minutes to 100 minutes.

[0033] Preferably, the sand mill is carried out with a sand mill, the mass ratio of the material to the steel ball is 1:1.25 to 1.3, the sand mill time is 40min to 90min, and the D50 average particle size of the sand milled material is 1.1 t...

Embodiment 1

[0059] 1) The raw material iron oxide Fe 2 o 3 , Trimanganese tetraoxide Mn 3 o 4 , Zinc oxide ZnO is accurately weighed according to the ratio of 54mol%, 42mol%, and 4mol%. After mixing, it is put into a stirring tank for mechanical stirring to make a slurry, and deionized water is added according to the ratio of material: deionized water = 1:0.7 (mass ratio) , the stirring time is 60min, and after the slurry is obtained, it is sanded by a steel ball double sand mill, wherein the slurry:steel ball=1:1.25 (mass ratio), and the sanding time is 50min, and a laser particle size analyzer is used to measure the particle size in the process Distribution, record D50 average particle diameter at 1.5 μm, after obtaining the micron-scale abrasive material, add the PVA (polyvinyl alcohol) solution that mass concentration is 8% while stirring in the storage tank, wherein the polyvinyl alcohol solution and the slurry The mass ratio is 0.1:1, and the stirring time is 30 minutes. After t...

Embodiment 2

[0069] 1) The raw material iron oxide Fe 2 o 3 , Trimanganese tetraoxide Mn 3 o 4 , Zinc oxide ZnO is accurately weighed according to the ratio of 55mol%, 40mol%, and 5mol%. After mixing, it is put into a stirring tank for mechanical stirring to make a slurry, and deionized water is added according to the ratio of material: deionized water = 1:0.8 (mass ratio) , the stirring time is 70min, and after the slurry is obtained, it is sanded by a steel ball double sand mill, wherein slurry: steel ball=1:1.27 (mass ratio), and the sanding time is 60min, and a laser particle size analyzer is used to measure the particle size in the process Distribution, record D50 average particle diameter at 1.3 μm, after obtaining the micron-scale abrasive material, add mass concentration while stirring in the storage tank and be 9% PVA (polyvinyl alcohol) solution, wherein the polyvinyl alcohol solution and slurry The mass ratio is 0.11:1, and the stirring time is 60 minutes. After the slurry i...

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Abstract

The invention relates to a manganese zinc ferrite material and a preparation method thereof. The manganese zinc ferrite material comprises main components in mole percentage: 54-56 percent of ferric oxide, 38-42 percent of trimanganese tetraoxide and 4-6 percent of zinc oxide, and auxiliary components selected from at least five of CaCO3, SiO2, K2CO3, Y2O3, NiO, Co3O4 and Al2O3. The manganese zinc ferrite material is low in self-power loss in a (0.1-1) MHz wide frequency range.

Description

technical field [0001] The invention relates to a manganese zinc ferrite material and a preparation method thereof. Background technique [0002] A large number of switching power supply modules are used in electronic and electrical equipment, electric vehicles, etc., to obtain the voltage and current supply required by each functional plate. The electronic transformer (or power inductor) in the switching power supply is composed of a ferrite core and a wire package, and its ability to transmit power P th and core operating frequency f, cross-sectional area A e , The available magnetic flux offset ΔB has a positive correlation, expressed as P th ∝f×ΔB×A e . Therefore, in order to convert the power of the same size, while keeping other conditions unchanged, increasing the operating frequency f of the switching power supply can reduce the effective magnetic circuit cross-sectional area A of the required magnetic core. e , so as to realize the miniaturization of the power ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 蒋胜勇姚木有胡春元王京平周锋赖永学吴勇华
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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