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Preparation method of multi-layer composite soft magnetic ferrite core

A soft magnetic ferrite, multi-layer composite technology, applied in the direction of magnetic core manufacturing, inductor/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve the problem of difficulty in reasonable control, large differences in sintering and other processes, and the inability to make flat or shape Complicated magnetic cores and other issues to achieve good electromagnetic characteristics and avoid performance deterioration

Pending Publication Date: 2022-01-14
天通凯立科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent makes anti-EMI magnetic cores by bonding and winding tapes with different magnetic properties existing in the market, which is different from the present invention, which starts from the more fundamental magnetic sheet manufacturing technology, adjusts the main formula and secondary formula, and pre-fires the process. Pulping, cast sheet sintering, etc. are used to control the performance of the secondary layer magnetic sheet in a wider range, and after bonding, it is hot-pressed into a billet, and then the finished magnetic core is prepared by punching or multi-wire cutting process, and the shape of the magnetic core is selected. stronger, but the winding method described in the patent CN 111584206 A is limited by the shape of the winding tool, and cannot make flat or complex-shaped magnetic cores, so it is limited to ring-shaped magnetic cores for filtering
[0007] In summary, in the process of preparing composite ferrite magnets in the prior art, there are still problems such as sintering and other process differences among the components of different composite materials, which are difficult to control reasonably

Method used

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  • Preparation method of multi-layer composite soft magnetic ferrite core
  • Preparation method of multi-layer composite soft magnetic ferrite core
  • Preparation method of multi-layer composite soft magnetic ferrite core

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Prepare the NiMnZn composite soft ferrite core according to the following method, the structure schematic diagram of the composite blank is shown in figure 1 .

[0046] Disk manufacturing process:

[0047] Step (1): MnZn magnetic sheet is manufactured using commercially available Fe 2 o 3 (purity ≥ 99.3%), Mn 3 o 4 (Mn content ≥ 71%), ZnO (purity ≥ 99.7%) raw materials according to the main formula Fe 2 o 3 : 52.91mol%, ZnO is 18.84mol%, and MnO is the balance for batching;

[0048] Step (2): Put the prepared raw materials in a sand mill, add deionized water at a ratio of 1:1, add 5wt% dispersant, mix for 15 minutes, take out the slurry and place it in an oven at 130°C for drying Dry;

[0049] Step (3): The dried powder is pre-fired in a resistance furnace, the pre-fired atmosphere is air, the time is 2 hours, the temperature is 900 ° C, and then it is cooled to room temperature with the furnace;

[0050] Step (4): Add sub-recipe: 500ppm CaCO to pre-fired mater...

Embodiment 2

[0088] Prepare the MnZn composite soft ferrite core according to the following method:

[0089] Manufacturing process of MnZn ferrite type A magnetic sheet:

[0090] Step (1): Using commercially available Fe 2 o 3 (purity ≥ 99.3%), Mn 3 o 4 (Mn content ≥ 71%), ZnO (purity ≥ 99.7%) raw materials, according to the main formula Fe 2 o 3 : 53.28mol%, ZnO: 10.84mol%, Mn 3 o 4 Dosing for the remainder;

[0091] Step (2): Put the prepared raw materials in a sand mill, add deionized water at a ratio of 1:1, add 5wt% dispersant, mix for 15 minutes, take out the slurry and place it in an oven at 130°C for drying Dry;

[0092] The dried powder is pre-fired in a resistance furnace, the pre-fired atmosphere is air, the time is 2 hours, the temperature is 900 ° C, and then it is cooled to room temperature with the furnace;

[0093] Step (3): Add sub-recipe: 800ppm CaCO to pre-baked material 3 , 150ppmNb 2 o 5 , 200ppmZrO 2 , 4500ppmCo 2 o 3 , carry out secondary ball milling...

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Abstract

The invention provides a preparation method of a multi-layer composite soft magnetic ferrite core, which relates to the technical field of composite soft magnetic ferrite manufacturing. The magnetic core prepared by the method is formed by stacking the soft magnetic ferrite composite layers; each soft magnetic ferrite composite layer is composed of soft magnetic ferrite secondary layers with different magnetic properties, and the electrical properties of the soft magnetic ferrite composite layers are determined by the electromagnetic properties of the composite layers, so that the soft magnetic ferrite composite layers can be adjusted by changing the main formula and the auxiliary formula of the soft magnetic ferrite materials of the secondary layers in the composite layers; the same purpose can be achieved by adjusting the arrangement mode of the secondary layers and the proportion of the secondary layers in the composite layer. The plurality of secondary layers are bonded, and blank pressing, blanking, heat treatment and curing are conducted to prepare the composite soft magnetic ferrite magnetic core. The ferrite magnetic core prepared by the method can solve the problems of difficult mutual dissolution of multiple components and large co-firing atmosphere difference of a composite soft magnetic ferrite material prepared by a traditional oxide method, can be combined and designed according to performance requirements, and widens the application field of the material.

Description

technical field [0001] The invention belongs to the technical field of manufacturing composite soft magnetic ferrite materials, and in particular relates to a method for preparing a composite magnetic core of MnZn ferrite and NiZn series ferrite. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, soft ferrite materials, as an important basic functional material, are widely used in electronic industries such as communications, filters, audio-visual equipment, sensors, and transformers. market expectation. With the miniaturization and high frequency of device design, the development of single-component ferrite materials is challenged, and there are often contradictions between various electromagnetic characteristics at the beginning of material design, such as high Bs power ferrite often It is necessary to adopt a high-iron content formula in the main formula and introduce Ni+ to increase the design o...

Claims

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Application Information

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IPC IPC(8): H01F27/25H01F1/34H01F41/02
CPCH01F27/25H01F1/34H01F41/0213H01F41/0246H01F41/02
Inventor 王鸿健丰江洲邢冰冰李赟黄艳峰夏铭洋
Owner 天通凯立科技有限公司
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