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Novel MnZn-doped ferrite material and preparation method thereof

A ferrite, a new type of technology, applied in the field of new MnZn ferrite ceramic materials and preparation, can solve the problems of high resistivity, low loss, etc., and achieve the effect of light weight, excellent comprehensive performance and small volume

Inactive Publication Date: 2012-01-11
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of modern science and technology and applications requires that MnZn-based ferrites not only have high saturation magnetization and permeability, but also have high resistivity and low loss. A single type of doping can no longer meet the needs, and compound doping is An important way to solve such problems

Method used

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  • Novel MnZn-doped ferrite material and preparation method thereof
  • Novel MnZn-doped ferrite material and preparation method thereof
  • Novel MnZn-doped ferrite material and preparation method thereof

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preparation example Construction

[0025] The preparation method includes the following process steps and contents:

[0026] (1) Weigh the main material according to the design composition of the Mn-Zn ferrite soft magnetic material. The main material component and mole percentage are: Fe 2 O 3 45~55mol%, ZnO 22~26mol%, MnO 2 23-29 mol%.

[0027] (2) Mix the so-called main material powder, high-purity and high-wear-resistant zirconia grinding medium, and deionized water in a polyurethane ball mill tank, and grind and mix them on a high-energy ball mill.

[0028] (3) After drying the slurry, it is pre-fired at 800-950°C and kept for 0.5-5 hours.

[0029] (4) Grind the pre-fired powder and add additives, the additives include Y 2 O 3 , Sb 2 O 3 , Cr 2 O 3 One or more of them, and each formula contains CaCO 3 , All additives are added in addition, respectively accounting for 0.05 to 5.0 mol% of the total amount of the main material; and 0.1 to 10 wt% of dispersant and adhesive are added respectively.

[0030] (5) Put the ...

Embodiment 1

[0039] Example 1: The commercially available analytical pure Fe 2 O 3 , ZnO, MnO 2 Mix the materials in a molar ratio, where Fe 2 O 3 45mol%, ZnO 26mol%, MnO 2 29mol%. Wet high-energy ball milling is used, in which the mass ratio of mixed powder, zirconia ball and deionized water is 1:4:2, and ball milled in a polyurethane ball mill for 12 hours. The obtained slurry was placed in a drying box and dried in the air at 105° C. for 96 hours. After rough grinding, it was pre-fired at 950° C. for 0.5 hours. Add 5mol% Y according to the molar ratio 2 O 3 , 5mol% CaCO 3 , And add 10wt% polyvinyl alcohol and 10wt% Davon C. According to the mass ratio of 1:4:2, the powder: grinding ball: deionized water is put into the polyurethane ball milling tank, after 72 hours of ball milling on the ball mill, it is dried in the air and in a drying box at 150°C for 96 hours, and then ground After sieving, dry pressed into a disc or ring shape. In an electric furnace, the temperature is increased...

Embodiment 2

[0041] Example 2: The commercially available analytical pure Fe 2 O 3 , ZnO, MnO 2 Mix the materials in a molar ratio, where Fe 2 O 3 55mol%, ZnO 22mol%, MnO 2 23mol%. Wet high-energy ball milling is used, in which the mass ratio of mixed powder, zirconia ball and deionized water is 1:4:2, and ball milled in a polyurethane ball mill for 72 hours. The obtained slurry was placed in a drying box and dried in a vacuum drying box at 40°C for 12 hours, and after rough grinding, it was pre-fired at 800°C for 5 hours. Add 0.05mol% Sb according to the molar ratio 2 O 3 、0.05mol%CaCO 3 , And add 0.1wt% polyvinyl alcohol and 0.1wt% Davon C. According to the mass ratio of 1:4:2, the powder: grinding ball: deionized water is put into the polyurethane ball mill tank, after 12 hours of ball milling on the ball mill, it is dried in a vacuum drying oven at 40°C for 96 hours. After sieving, dry pressed into disc or ring shape. In an electric furnace, the temperature is raised according to a ...

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Abstract

The invention which relates to a novel MnZn-doped ferrite material and a preparation method thereof belongs to the technical field of preparations and applications of electron ceramics. The material comprises main materials and an additive, wherein the main material comprises, by mole, 45-55mol% of Fe2O3, 22-26mol% of ZnO, 23-29mol% of MnO2; and the additive comprises one or more of Y2O3, Sb2O3 and Cr2O3, each formula contains CaCO3, and each additive which is additionally added respectively accounts for 0.05-5.0mol% of the total mole of the main materials. The preparation method of the material which sequentially comprises processes and steps of main material burdening, ball milling, drying, preburning, crushing, doping, secondary ball milling, sieving, compression molding, sintering and the like has the advantages of economy, simplicity and reliability. The material which has the advantages of high saturation magnetization and initial magnetic permeability, low loss and coercive force, and excellent comprehensive electromagnetic performance is especially applied to high frequency devices with small volume, light mass, and high sensitivity.

Description

Technical field [0001] The invention relates to a novel MnZn series ferrite ceramic material and a preparation method, belonging to the technical field of electronic ceramic preparation and application. Background technique [0002] MnZn ferrite is a widely used soft magnetic material. With the rapid development of electronic technology, the application range of MnZn ferrite is increasing. Because MnZn ferrite has high saturation magnetic induction, high permeability, high resistivity, low loss and other characteristics, it is widely used in various components, such as power transformers, yoke coils, pulse broadband transformers, Magnetic deflection devices and sensors, etc. The transformer core made of MnZn ferrite's high saturation magnetization, high resistivity and low loss has become an indispensable component of computers, communications, color TVs, video recorders, office automation and other electronic equipment. With the development of miniaturization, weight reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 彭志坚邢庆凯王成彪付志强岳文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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