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High-frequency high-impedance iron-poor manganese-zinc ferrite and preparation method thereof

A manganese-zinc ferrite and manganese-zinc ferrite technology, applied in the field of soft ferrite, can solve the problems of limited anti-EMI, low impedance, saturation magnetic induction and low Curie temperature, etc., to avoid excessive oxidation Effect

Active Publication Date: 2020-06-05
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to overcome the problem that the ferrite material in the prior art has low impedance at high frequency, low saturation magnetic induction and low Curie temperature, so the anti-EMI ability of the EMI-suppressing components made by it is limited, and provides A high-frequency high-impedance iron-poor manganese-zinc ferrite and its preparation method, through formula development and trace element modification, and improving the preparation method, it has high magnetic permeability and high saturation magnetic induction at high frequency And high-impedance high-performance anti-EMI manganese-zinc soft ferrite material

Method used

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  • High-frequency high-impedance iron-poor manganese-zinc ferrite and preparation method thereof

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Effect test

Embodiment 1

[0041] A method for preparing a high-frequency high-impedance iron-poor manganese-zinc ferrite, the steps are:

[0042] (1) Ingredients and sanding: take 48.6% Fe by mole percentage 2 o 3 , 32.8% MnO, 17.5% ZnO and 1.1% Co 2 o 3 Put the four main components into a sand mill and add deionized water for mixing and crushing for 40 minutes. After uniform mixing, spray granulation to obtain spray material;

[0043] (2) Pre-burning: Put the spray material into the pre-burning furnace of the rotary kiln, and pre-fire it at 800°C to obtain the pre-fired material, and the feed rate is 250kg / h;

[0044] (3) Secondary sanding: add additives to the calcined material: 50ppm SiO 2 , 500ppm CaCO 3 , 200ppm Bi 2 o 3 , 200ppm ZrO 2 , 400ppm TiO 2 , then add deionized water and put it into a sand mill for secondary sand grinding to obtain secondary sand abrasives. The feed rate is 233kg / h (calculated as dry powder), and the particle size distribution is controlled at X50: 1.2μm; X99: 3...

Embodiment 2

[0052] A method for preparing a high-frequency high-impedance iron-poor manganese-zinc ferrite, the steps are:

[0053] (1) Ingredients and sanding: take 47.8% Fe by mole percentage 2 o 3 , 36% MnO, 15% ZnO and 1.2% Co 2 o 3 Put the four main components into a sand mill and add deionized water for mixing and crushing for 30 minutes. After uniform mixing, spray granulation to obtain spray material;

[0054] (2) Pre-burning: Put the spray material into the pre-burning furnace of the rotary kiln, and pre-fire it at 750°C to obtain the pre-fired material, and the feed rate is 200kg / h;

[0055] (3) Secondary sanding: add additives to the calcined material: 10ppm SiO 2 , 200ppm CaCO 3 , 100ppm Bi 2 o 3 , 100ppm ZrO 2 , 100ppm TiO 2 , then add deionized water and put it into a sand mill for secondary sand grinding to obtain secondary sand abrasives. The feed rate is 200kg / h (calculated as dry powder), and the particle size distribution is controlled at X50: 1.0μm; X99: 2.0μm...

Embodiment 3

[0063] A method for preparing a high-frequency high-impedance iron-poor manganese-zinc ferrite, the steps are:

[0064] (1) Ingredients and sanding: take 49.8% Fe by mole percentage 2 o 3 , 31% MnO, 18.5% ZnO and 0.7% Co 2 o 3 Put the four main components into a sand mill and add deionized water for mixing and crushing for 50 minutes. After uniform mixing, spray granulation to obtain spray material;

[0065] (2) Pre-burning: Put the sprayed material into the pre-burning furnace of the rotary kiln, and pre-fire it at 900°C to obtain the pre-fired material, and the feed rate is 300kg / h;

[0066] (3) Secondary sanding: add additives to the calcined material: 100ppm SiO 2 , 1000ppm CaCO 3 , 300ppm Bi 2 o 3 , 300ppm ZrO 2 , 600ppm TiO 2 , then add deionized water and put it into a sand mill for secondary sand grinding to obtain secondary sand abrasives. The feed rate is 250kg / h (calculated as dry powder), and the particle size distribution is controlled at X50: 1.4μm; X99:...

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Abstract

The invention relates to the technical field of soft magnetic ferrites. The high-frequency high-impedance iron-poor manganese-zinc ferrite comprises main components and additives, the main componentscomprise the following raw materials in percentage by mole: 47.8%-49.8% of Fe2O3, 31%-36% of MnO, 15%-18.5% of ZnO and 0.7%-2% of Co2O3, the additives comprise 10 to 100 ppm of SiO2, 200 to 1000 ppm of CaCO3, 100 to 300 ppm of Bi2O3, 100 to 300 ppm of ZrO2 and 100 to 600 ppm of TiO2. According to the invention, the Co2O3 is added into the main components, the ratio of the main components is reasonably adjusted, and meanwhile, the additives are added for modification, so that the prepared iron-poor manganese-zinc ferrite also has high magnetic conductivity, high saturation flux density and highimpedance at high frequency.

Description

technical field [0001] The invention relates to the technical field of soft magnetic ferrite, in particular to a high-frequency high-impedance iron-poor manganese-zinc ferrite and a preparation method thereof. Background technique [0002] With the increasing development of electronic technology, especially the rapid development of digital technology. All countries in the world attach great importance to the ability of electronic equipment to resist EMI. How to effectively reduce the electromagnetic wave interference of electronic equipment has become a common concern of researchers. Various EMI suppression components made of soft ferrite are widely used in various electronic devices to prevent unwanted signal feedback and coupling, avoid parasitic oscillations, and effectively suppress conduction and radiation noise. Among many anti-electromagnetic interference measures, the EMI power filter is a very effective device. It consists of passive components (L, R, C) to form a ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/64
CPCC04B35/265C04B35/64C04B2235/3206C04B2235/3232C04B2235/3244C04B2235/3262C04B2235/3275C04B2235/3284C04B2235/3298C04B2235/3418C04B2235/661C04B2235/662
Inventor 肖时勇张政王朝明赵旭杜阳忠
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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