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A kind of preparation method of high-frequency high-resistivity li-zn ferrite soft magnetic material

A high-frequency high-resistivity, soft-magnetic material technology, applied in the field of preparation of ferrite soft-magnetic materials, can solve the problems of unsatisfactory microstructure, uneven distribution, low forming density of sintered body, etc., to improve magnetic properties, Reduced particle agglomeration, improved molding density and uniformity

Inactive Publication Date: 2015-10-14
王建芝 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-efficiency ferrite for the preparation of Li-Zn ferrite with nano-powders in the background technology, which has low molding density and uneven distribution, which leads to unsatisfactory microstructure and poor performance of the sintered body. Preparation method of Li-Zn ferrite soft magnetic material with high frequency and high resistivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking x=1, the Li-Zn ferrite soft magnetic material Li 1.5 ZnFe 1.5 o 4 .

[0022] 1) Add 1 gram of cetyltrimethylamine bromide to 100 grams of ferrous sulfate solution with a mass fraction of 30%, then add 20.68 grams of zinc sulfate and 3.99 grams of lithium acetate and stir for 0.5 hours, and use a mass fraction of 5% The sulfuric acid solution adjustment system pH value is 4;

[0023] 2) Continue to add 5 grams of vinyltrichlorosilane, raise the temperature of the system to 40°C, and keep stirring for 0.5 hours to prepare a dispersion mixture;

[0024] 3) Transfer the dispersed mixed liquid prepared in step 2) to a high-pressure reactor for hydrothermal crystallization reaction, the crystallization temperature is 120°C, and the crystallization time is 36 hours, then filtered, washed, and dried to obtain a mixed powder;

[0025] 4) The mixed powder prepared in step 3) and the silica sol with a mass concentration of silica of 20% were ground and stirred at a mass...

Embodiment 2

[0027] Taking x=2, the Li-Zn ferrite soft magnetic material LiZn is obtained 2 FeO 4 .

[0028] 1) Add 5 grams of cetyltrimethylamine bromide to 100 grams of ferrous sulfate solution with a mass fraction of 45%, then add 93.07 grams of zinc sulfate and 5.98 grams of lithium acetate and stir for 2 hours, and use a mass fraction of 15% The sulfuric acid solution adjustment system pH value is 6;

[0029] 2) Continue to add 15 grams of vinyltrimethoxysilane, raise the temperature of the system to 60°C, and keep stirring for 2 hours to prepare a dispersion mixture;

[0030] 3) Transfer the dispersed mixed solution prepared in step 2) to a high-pressure reactor for hydrothermal crystallization reaction, the crystallization temperature is 160°C, and the crystallization time is 12 hours, then filtered, washed, and dried to obtain a mixed powder;

[0031] 4) The mixed powder prepared in step 3) and the silica sol with a mass concentration of 30% of silica were ground and stirred at ...

Embodiment 3

[0033] Taking x=3, the Li-Zn ferrite soft magnetic material Li 0.5 Zn 3 Fe 0.5 o 4 .

[0034] 1) Add 3 grams of cetyltrimethylamine bromide to 100 grams of ferrous sulfate solution with a mass fraction of 20%, then add 120.22 grams of zinc sulfate and 2.65 grams of lithium acetate and stir for 1 hour, and use a mass fraction of 10% The hydrochloric acid solution adjustment system pH value is 5;

[0035] 2) Continue to add 10 grams of vinyltrimethoxysilane, raise the temperature of the system to 50°C, and keep stirring for 1 hour to prepare a dispersion mixture;

[0036] 3) Transfer the dispersed mixed solution prepared in step 2) to a high-pressure reactor for hydrothermal crystallization reaction, the crystallization temperature is 150°C, and the crystallization time is 24 hours, then filtered, washed, and dried to obtain a mixed powder;

[0037] 4) The mixed powder prepared in step 3) and the silica sol with a mass concentration of silica of 40% were ground and stirred ...

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Abstract

The invention relates to a preparation method of a Li-Zn soft magnetic ferrite with high frequency and high resistivity. The preparation method comprises the following steps of firstly preparing dispersion mixed liquid by adding zinc sulfate and lithium acetate to a ferrous sulfate solution and then carrying out hydrothermal crystallization reaction in a high pressure reactor, thus preparing mixed powder; finally grinding and stirring the prepared mixed powder and silica sol, carrying out cold press forming on the powder, and roasting and sintering the product, thus preparing the Li-Zn soft magnetic ferrite. The Li-Zn soft magnetic ferrite has the advantages that 1) by adding a silane coupling agent, particle agglomeration can be effectively reduced, the dispersibility and flowability of the powder can be improved, and the forming density and uniformity of the Li-Zn ferrite can be improved; 2) the Li-Zn ferrite has good high-frequency soft magnetic properties and relatively low sintering temperature; 3) silica sol is adopted as the inorganic binder and silicon can play a role of doping in the high temperature sintering process, thus improving the magnetic properties and microstructure of the Li-Zn ferrite.

Description

technical field [0001] The invention relates to a preparation method of a ferrite soft magnetic material, in particular to a preparation method of a Li-Zn ferrite soft magnetic material with high frequency and high resistivity. Background technique [0002] With the development of electronic technology, the research of electromagnetic shielding and absorbing materials has been highly valued by various countries. The development of new electromagnetic shielding and absorbing materials with good structural stability, high absorption, wide frequency band and low density is not only the need of stealth technology , and the civil field also has a very wide range of applications. [0003] Li-Zn ferrite is a very important soft magnetic material with spinel structure, which has high resistivity, squareness ratio and Curie temperature, wide adjustable range of saturation magnetization, low sensitivity of remanence to stress, temperature It is widely used in the manufacture of micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/632
Inventor 李江太
Owner 王建芝
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