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Preparation method of soft magnetic ferrite material

A soft ferrite and auxiliary material technology, which is applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc. Market demand, increasing the volume of Mn-Zn ferrite cores, etc., to achieve the effect of increasing the saturation magnetic flux density, increasing the density, and increasing the saturation magnetic flux

Inactive Publication Date: 2022-06-24
湖北华磁电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with metal soft magnetic materials, the saturation magnetic flux density of Mn-Zn soft magnetic materials is still relatively low.
This means that in order to generate the same magnetic flux density as the metal core, the volume of the Mn-Zn ferrite core needs to be increased, which does not meet the market demand for miniaturization of electronic devices
In addition, the Curie temperature of Mn-Zn ferrite is low, resulting in a large decrease in the magnetic flux density near the operating temperature (100 ° C) compared with room temperature

Method used

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  • Preparation method of soft magnetic ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a soft ferrite material, comprising the following steps: the raw material includes a main material and an auxiliary material, and the main material is: Fe 2 O 3 80 parts, Mn 3 O 4 25 parts, 3 parts of ZnO, auxiliary materials: 0.1 part of CaO, Co 2 O 3 0.001 part, SiO 2 0.001 part, 2 parts superfine heavy calcium, 0.001 part chopped glass fiber;

[0030] Step S1: primary ball milling of the main material: the main material is ground in a ball mill to a particle size of 10 μm, dried and cooled to room temperature;

[0031] Step S2: Pre-sintering: the cooled main material is pre-sintered at a temperature of 600°C and a pre-sintered time of 1.5h, taken out and then cooled and blended with the auxiliary materials;

[0032] Step S3: secondary ball milling: put the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.5 hours, and obtain a pre-sintered mixture after drying;

[0033] Step S4: Mixing and grin...

Embodiment 2

[0039] A preparation method of a soft ferrite material, comprising the following steps: the raw material includes a main material and an auxiliary material, and the main material is: Fe 2 O 3 85 parts, Mn 3 O 4 40 parts, 5 parts of ZnO, auxiliary materials: 0.3 parts of CaO, Co 2 O 3 0.002 part, SiO 2 0.003 part, 5 parts of superfine heavy calcium, 0.003 part of chopped glass fiber;

[0040] Step S1: primary ball milling of the main material: the main material is ground in a ball mill to a particle size of 20 μm, dried and cooled to room temperature;

[0041] Step S2: Pre-sintering: the cooled main material is pre-sintered at a temperature of 750° C. and a pre-sintered time of 2 hours, taken out and then cooled and blended with the auxiliary materials;

[0042] Step S3: secondary ball milling: put the mixed main material and auxiliary material into a ball mill for secondary ball milling for 3 hours, and obtain a pre-sintered mixture after drying;

[0043] Step S4: Mixin...

Embodiment 3

[0049] A preparation method of a soft ferrite material, comprising the following steps: the raw material includes a main material and an auxiliary material, and the main material is: Fe 2 O 3 82 parts, Mn 3 O 4 30 parts, 4 parts of ZnO, auxiliary materials: 0.2 parts of CaO, Co 2 O 3 0.0015 part, SiO 2 0.002 part, 3 parts of superfine heavy calcium, 0.002 part of chopped glass fiber;

[0050] Step S1: primary ball milling of the main material: the main material is ground in a ball mill to a particle size of 15 μm, dried and cooled to room temperature;

[0051] Step S2: Pre-sintering: the cooled main material is pre-sintered at a temperature of 650°C and a pre-sintered time of 1.8 hours, taken out and then cooled and blended with the auxiliary materials;

[0052] Step S3: secondary ball milling: put the mixed main material and auxiliary material into a ball mill for secondary ball milling for 2.8 hours, and obtain a pre-sintered mixture after drying;

[0053] Step S4: Mi...

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Abstract

The invention provides a preparation method of a soft magnetic ferrite material, which comprises the following steps: S1, primary ball milling of a main material: grinding the main material in a ball mill to a micron level, drying, and cooling to room temperature; s2, pre-sintering: pre-sintering the cooled main material for a period of time, taking out, cooling, and blending with the auxiliary material; s3, secondary ball milling: putting the mixed main material and auxiliary material into a ball mill for secondary ball milling, and drying to obtain a pre-sintered mixture; and S4, mixing and grinding: grinding the pre-sintered mixture in a ball mill, drying after grinding, granulating, pressing, sintering and molding to obtain the target soft magnetic ferrite material. The invention provides the preparation method of the soft magnetic ferrite material with high saturation magnetic flux density and excellent magnetic performance.

Description

technical field [0001] The invention relates to the technical field of soft ferrite cores, in particular to a preparation method of a soft ferrite material. Background technique [0002] The miniaturization, flattening and high efficiency of electronic devices used in home appliances, automotive electronics and other fields continue to promote the development of various soft ferrite materials. The manganese-zinc (Mn-Zn) soft ferrite is the most widely used and the most widely used in all ferrite materials, and its usage accounts for more than 80% of the total amount of ferrite. Because Mn-Zn materials have the characteristics of high magnetic permeability, high saturation flux density (Bs), and low high-frequency loss, they have a wide range of applications in the field of high-frequency power electronics. However, compared with metal soft magnetic materials, the saturation magnetic flux density of Mn-Zn soft magnetic materials is still relatively low. This means that to g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C04B35/622C04B35/82H01F41/02H01F1/34C04B35/64
CPCC04B35/2633C04B35/265C04B35/622C04B35/82H01F41/02H01F1/34C04B35/64C04B2235/3263C04B2235/3284C04B2235/3208C04B2235/3275C04B2235/3418C04B2235/442C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/6584C04B2235/96C04B2235/95
Inventor 任芳李崇华刘海汪竟阳
Owner 湖北华磁电子科技有限公司
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