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Manganese zinc power ferrite magnetic powder core and preparation method thereof

A manganese-zinc ferrite and magnetic powder core technology, which is applied in the field of manganese-zinc power ferrite magnetic powder cores and its preparation, can solve problems such as inability to get rid of the performance constraints of magnetic powder cores, complicated preparation processes, and low product qualification rates, and achieve particle size The effect of uniformity, simple preparation process and shortened process flow

Active Publication Date: 2013-06-26
HAINING LIANFENG MAGNET IND
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Chinese Patent Publication No. CN1447356A mentions a method for preparing manganese-zinc ferrite powder, but the raw material of this preparation method is still to use Fe purchased on the market 2 o 3 , Mn 3 o 4 , ZnO powder, and then follow-up mixing, granulation, etc., still cannot get rid of the performance constraints brought by the purity of the original material to the magnetic powder core
[0005] The manganese-zinc ferrite magnetic powder cores prepared by the above-mentioned patents are still restricted by the batch purity of raw materials, and the preparation process is very complicated. If there is a problem in one link, the entire batch of products may be scrapped, resulting in a low product qualification rate

Method used

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  • Manganese zinc power ferrite magnetic powder core and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Using Fe 2 o 3 53mol%, ZnO15mol%, MnO32mol%, carry out vacuum smelting at 1800°C, then water atomize to make powder, prepare according to the preferred particle size, add 0.3wt% boron oxide, 0.1wt% kaolin, 0.15wt% stearin Zinc acid and barium stearate, mixed evenly at 6t / cm 2 Compression molding under pressure, annealing in a vacuum annealing furnace at 800°C for 1 hour to obtain a manganese-zinc power ferrite core whose characteristics meet the product requirements.

Embodiment 2

[0027] Using Fe 2 o 3 54mol%, ZnO13mol%, Mn 3 o 4 33mol%, carried out vacuum smelting at 1900°C, then water atomized powder, prepared according to the preferred particle size, adding 0.2wt% boron oxide, 0.3wt% kaolin, 0.25wt% zinc stearate and stearin Barium oxide, mixed evenly at 6t / cm 2 Compression molding under pressure, annealing in a vacuum annealing furnace at 500°C for 2 hours to obtain a manganese-zinc power ferrite core whose characteristics meet the product requirements.

Embodiment 3

[0029] Using Fe 2 o 3 55mol%, ZnO11mol%, MnO34mol%, carry out vacuum smelting under the condition of 2000 ℃, then water atomization powder, prepare according to the preferred particle size, add 0.1wt% boron oxide, 0.2wt% kaolin, 0.3wt% hard Zinc stearate and barium stearate, mixed evenly at 6t / cm 2 Compression molding under pressure, annealing in a vacuum annealing furnace at 700°C for 1.5 hours to obtain a manganese-zinc power ferrite core whose characteristics meet the product requirements.

[0030] Three examples to test the initial permeability μ i The comparison of power loss Pcv is shown in the following table:

[0031]

[0032] It can be seen from the above table that the manganese-zinc ferrite core prepared in the embodiment of the present invention is a manganese-zinc power ferrite core, and the power loss at 100 kHz and 300 kHz is relatively low.

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Abstract

The invention discloses a manganese zinc power ferrite magnetic powder core and a preparation method thereof. The preparation method comprises the following steps of: (1) preparing raw materials, wherein the raw materials include main materials and auxiliary materials, the main materials include Fe2O3, ZnO, and MnO, or Mn3O4, proportional relation of ingredients in the main raw materials is as follows: 53-55mol% of Fe2o3, 32-34mol% of one or the mixture of the MnO and the Mn3O4, and the balance of ZnO; (2) smelting: placing Fe2O3, ZnO, and MnO, or Mn3O4 into a vacuum furnace in the sequence from bottom to top, covering the furnace cover, and vacuumizing the vacuum furnace to carry out smelting, wherein smelting temperature is 1400-2000 DEG C; (3) preparing powder through atomization; (4) carrying out compression molding; and (5) annealing the molded product in a vacuum annealing furnace at 500-800 DEG C for 1-2 hours. The preparation method disclosed by the invention has lower requirements for the purity and particle size distribution of the raw materials compared with a traditional preparation method, and the cost of the raw materials is reduced.

Description

technical field [0001] The invention relates to a manganese zinc power ferrite magnetic powder core and a preparation method thereof. Background technique [0002] With the continuous development of the electronics industry, higher and higher requirements are put forward for the purity of manganese-zinc ferrite raw materials. From the perspective of the preparation of traditional manganese-zinc ferrite, high-purity raw materials are the key to the preparation of electronic components with excellent comprehensive performance. device prerequisites. [0003] Chinese Patent Publication No. CN1447356A mentions a method for preparing manganese-zinc ferrite powder, but the raw material of this preparation method is still to use Fe purchased on the market 2 o 3 , Mn 3 o 4 , ZnO powder, and then follow-up mixing, granulation, etc., still cannot get rid of the performance constraints brought by the purity of the original material to the magnetic powder core. [0004] Chinese Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 李永劬严建强郭凤鸣杨晓光王士杰
Owner HAINING LIANFENG MAGNET IND
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