Preparation method of manganese-zinc ferrite with high magnetic conductivity

A manganese-zinc ferrite, high magnetic permeability technology, applied in the direction of inorganic material magnetism, can solve the problems of abnormal product growth, poor uniformity of fired products, and decreased purity, and achieves prevention of secondary agglomeration, small particle size, The effect of improving particle size uniformity

Inactive Publication Date: 2019-12-17
山东春光磁电科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, if the sintering temperature is too high in the first method, the uniformity of the fired product will be poor; in the second method, too many impurities will be easily introduced during the sanding process, that is, the purity will decrease, resulting in abnormal growth of the product, etc.

Method used

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  • Preparation method of manganese-zinc ferrite with high magnetic conductivity
  • Preparation method of manganese-zinc ferrite with high magnetic conductivity
  • Preparation method of manganese-zinc ferrite with high magnetic conductivity

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preparation example Construction

[0034] Such as figure 1 Said, the preparation method of the high magnetic permeability MnZn ferrite provided by the application comprises:

[0035] S110: Fe 2 o 3 , ZnO and MnO mixtures are placed in a ball mill and triethanolamine or triethanolamine sulfate is added to the ball mill to obtain a primary ball mill powder after ball milling, wherein the average particle size of the primary ball mill powder is 0.5-1.5um.

[0036] Among them, Fe 2 o 3 : ZnO: The molar ratio of MnO is (51-55): (21-25): (20-28), Fe 2 o 3 The content of triethanolamine or triethanolamine sulfate is greater than 50mol% in the formula, which can reduce the crystal magnetic anisotropy constant and the hysteresis stretching coefficient, thereby improving the initial magnetic permeability of the material; the mass fraction of the triethanolamine or triethanolamine sulfate is 0.05-0.5 %.

[0037] For the first time in this application, the ball mill utilizes the high-speed rotation of the steel ball...

Embodiment 1

[0058] Put α-Fe2O3, 21% ZnO, and 20% MnO in a molar ratio of 51% in a dry ball mill or Raymond mill, and add 0.05% triethanolamine as a dry grinding aid as a dry dispersant for solid phase Ball milling and crushing to obtain a mixed powder with a D50 particle size of 0.5-1.5um, and confirm that the main components are within the control range by fluorescence analysis;

[0059] After the above mixture is pressed into tablets or pelletized, it is pre-fired in a rotary kiln at a temperature of 750°C for 1 hour;

[0060] Add 0.05% calcium lignosulfonate to the pre-burned flake or spherical particles as a grinding aid after pre-burning, and carry out full dry vibration grinding, and the crushing particle size requires D50≤1.5um;

[0061] Transfer the above powder into a sand mill tank, use bearing steel balls with low Si and Cr content and a ball diameter of 1 to 3mm as the ball milling medium, the ball-to-material ratio is 4:1, and add Bi2O3, MoO3, Co2O3 , TiO2 and other additive...

Embodiment 2

[0066] Put α-Fe2O3, 25% ZnO, and 28% MnO in a molar ratio of 55% in a dry ball mill or Raymond mill, and add 0.5% triethanolamine or triethanolamine sulfate as a dry grinding aid. The dispersant is crushed by solid-phase ball milling to obtain a mixed powder with a D50 particle size of 0.5-1.5um, and it is confirmed by fluorescence analysis that the main components are within the control range;

[0067] After the above mixture is pressed into tablets or pelletized, it is pre-fired in a rotary kiln at a temperature of 950°C for 1 hour;

[0068] Add 0.5% calcium lignosulfonate to the pre-burned flake or spherical particles as a grinding aid after pre-burning, and carry out full dry vibration grinding, and the crushing particle size requires D50≤1.5um;

[0069] Transfer the above powder into a sand mill tank, use bearing steel balls with low Si and Cr content and a ball diameter of 1-3 mm as the ball milling medium, the ball-to-material ratio is 8:1, and add Bi2O3, MoO3, Co2O3 ,...

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Abstract

The invention provides a preparation method of manganese-zinc ferrite with a high magnetic conductivity. Fe2O3, ZnO and MnO which are used as raw materials undergo primary ball-milling and presintering to realize primary ferritization, and then undergo secondary ball-milling crushing and granulation to obtain manganese-zinc ferrite particles, and the particles are molded and sintered to obtain a manganese-zinc ferrite powder. The Fe2O3, ZnO and MnO are mixed in a ball mill, triethanolamine or triethanolamine sulfate is added, large particles are broken by utilizing the mechanical force of theball mill to form small particles, the triethanolamine or triethanolamine sulfate can be effectively adsorbed on the surfaces of the particles in an electrostatic manner as a dispersant, so secondaryagglomeration of the particles is prevented, thereby the particle size of the ball-milled particles is small, and the magnetic conductivity of the obtained manganese-zinc ferrite powder is high; and calcium lignosulphonate is decomposed into CaO in the subsequent sintering process, and is deposited at the grain boundary, so the resistivity of the product is improved, thereby the magnetic conductivity of the manganese-zinc ferrite powder is improved.

Description

technical field [0001] The present application relates to the technical field of ferrite materials, in particular to a preparation method of manganese zinc ferrite with high magnetic permeability. Background technique [0002] Manganese zinc ferrite is a soft magnetic material with a spinel structure, which is widely used in communication, sensing, television and other industries because of its high magnetic permeability, low loss and other physical and chemical properties; The rapid development of the electronics industry has put forward higher and higher requirements on the performance of materials, such as high magnetic permeability. [0003] The production process of high magnetic permeability manganese zinc ferrite mainly includes dry method and wet method. The dry method has the advantages of simple process and good uniformity, and is widely used in high magnetic permeability manganese zinc ferrite. In the production process of powder; the production process of dry ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38H01F1/37
CPCC04B35/265C04B35/2633H01F1/37C04B2235/3298C04B2235/3256C04B2235/3232C04B2235/96C04B2235/48
Inventor 刘涛韩卫东宋兴连孔志强高中国解丽丽
Owner 山东春光磁电科技有限公司
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