Method for preparing low-power loss manganese-zinc ferrite based on core-shell structure grains

A manganese-zinc ferrite, core-shell structure technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of magnetic performance damage, poor grain uniformity, and reduced sintered density of materials, so as to reduce the magnetic Effect of hysteresis loss and eddy current loss

Active Publication Date: 2017-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such additives are not magnetic, and excessive addition will easily lead to a decrease in the sintered density of the material, a deterioration of the uniformity of the grains, and a decrease in the magnetic permeability of the manganese-zinc ferrite, which will greatly damage the magnetic properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0031] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.2wt%, ZnO: 5.82wt%, MnO 2 : For the balance, the main component is ball-milled for 1 hour, and the black powder is obtained by pre-calcination at 900°C for 2 hours; the black powder obtained by pre-calcination is added to the auxiliary component based on the total amount of the main component, and the content of the auxiliary component is calculated as: SiO 2 : 100ppm, CaO: 1500ppm, V 2 o 5 : 500ppm, Nb 2 o 5 : 1000ppm, TiO 2 : 1000ppm, add an appropriate amount of deionized water, and mill for 4 hours for the second ball mill to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball mill, grind and disperse, add Polyvinyl alcohol is granulated and sieved to obtain manganese-zinc ferrite powder; the granulated powder is pressed into shape, put into an atmosphere sintering fu...

Embodiment example 2

[0034] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.2wt%, ZnO: 5.82wt%, MnO 2: For the balance, the main component is ball-milled for 1 hour, and the black powder is obtained by pre-calcination at 900°C for 2 hours; the black powder obtained by pre-calcination is added to the auxiliary component based on the total amount of the main component, and the content of the auxiliary component is calculated as: B 2 o 3 : 500ppm, CaO: 1500ppm, V 2 o 5 : 500ppm, Nb 2 o 5 : 600ppm, TiO 2 : 2000ppm, and add an appropriate amount of deionized water, mill the second time for 4 hours to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball milling, grind and disperse, add Polyvinyl alcohol is granulated and sieved to obtain manganese-zinc ferrite powder; the granulated powder is pressed into shape, put into an atmosphere sintering furnace...

Embodiment example 3

[0037] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.64wt%, ZnO: 5.46wt%, MnO 2 : For the balance, the main component is ball-milled for 1 hour, and the black powder is obtained by pre-calcination at 900°C for 2 hours; the black powder obtained by pre-calcination is added to the auxiliary component based on the total amount of the main component, and the content of the auxiliary component is calculated as: Bi 2 o 3 : 500ppm, CaO: 1000ppm, MoO 3 : 600ppm, Nb 2 o 5 : 800ppm, TiO 2 : 1000ppm, add an appropriate amount of deionized water, and mill for 4 hours for the second ball mill to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball mill, grind and disperse, add Polyvinyl alcohol is granulated and sieved to obtain manganese-zinc ferrite powder; the granulated powder is pressed into shape, put into an atmosphere sintering f...

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Abstract

The invention provides a method for preparing low-power loss manganese-zinc ferrite based on core-shell structure grains. Through adding of high-resistance low-melting point oxide, the core-shell structure grains are formed, so that the power loss of the manganese-zinc ferrite is reduced. The innovativeness of the invention is that the higher pre-sintering temperature is adopted, so that pre-sintered powder obtains a higher ferrite percentage; through ball milling, the size of ferrite powder is reduced below the single domain size; and then, the low-melting point oxide is added, and an additive is molten on the ferrite particle surface during sintering, so that the grains with high-resistivity shells are formed, and the hysteresis loss and the eddy current loss of the manganese-zinc ferrite are simultaneously and greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing manganese-zinc ferrite with low power loss based on core-shell structure grains, and belongs to the technical field of magnetic materials. Background technique [0002] As an important component material, soft ferrite is mainly made into magnetic cores for the manufacture of various inductors, transformers, filters and choke coils, and is widely used in modern power and electronic information fields, such as computers and Peripheral equipment, office automation equipment, digital communication and analog communication equipment, Internet, household appliances, electromagnetic compatibility equipment, green lighting, industrial automation and automotive, aviation, aerospace and military fields. Compared with other soft magnetic materials, the advantage of soft magnetic ferrite is that the resistivity is relatively high, which suppresses the generation of eddy current, so that ferrite can be used in high-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/34
CPCC04B35/2658C04B35/622C04B2235/3267C04B2235/3284C04B2235/5436C04B2235/5445C04B2235/6584H01F1/344
Inventor 严密白国华霍骅鑫姜银珠王小雨金佳莹马天宇
Owner ZHEJIANG UNIV
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