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MnZn soft magnetic ferrite material with high frequency, low temperature coefficient and low loss and preparation method thereof

A technology of soft magnetic ferrite and low temperature coefficient, applied in the field of magnetic materials, can solve the problems of poor performance such as power loss in the working temperature range, and achieve the effect of good temperature stability and low power loss

Active Publication Date: 2017-09-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working frequency of the existing MnZn soft magnetic ferrite materials is generally below 1MHz. The MnZn ferrite prepared in the Chinese patent (CN104446409A) is only suitable for working at a frequency of 0.1-1MHz. The Chinese patent (CN103833344A) prepared The manganese zinc power ferrite can be used at the operating frequency of 2MHz and below, and the operating frequency of a few MnZn ferrite materials can reach 3MHz, but its magnetic permeability, operating temperature range and power loss are relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0033] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.2wt%, ZnO: 5.82wt%, MnO: the remainder, the main component was ball milled for 1 hour, and pre-fired at 930°C for 2 hours to obtain a black powder; Subcomponents, the content of subcomponents is calculated as the first type of subcomponents in terms of oxides: SiO 2 : 500ppm, CaO: 1500ppm, the second type of subcomponent: V 2 o 5 : 1000ppm, Nb 2 o 5 : 3000ppm, the third subcomponent: SnO 2 : 1000ppm, CoO: 500ppm, add an appropriate amount of deionized water, and mill for 4 hours twice to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; after the second ball milling, the particles are dried Grind and disperse, add polyvinyl alcohol to granulate, and sieve to obtain manganese-zinc ferrite powder; press the granulated powder into shape, and put it into an atmosphere sintering furnace for sintering. The equilibr...

Embodiment example 2

[0036] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.64wt%, ZnO: 5.46wt%, MnO: the remainder, the main component was ball milled for 1 hour, and pre-fired at 930°C for 2 hours to obtain black powder; Subcomponents, the content of subcomponents is calculated as the first type of subcomponents in terms of oxides: SiO 2 : 1000ppm, CaCO 3 : 2000ppm, second-class subcomponent: TiO 2 : 2000ppm, MoO 3 : 500ppm, the third type of subcomponent: Co 3 o 4 : 800ppm, ZrO 2 : 300ppm, 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 for sintering, the...

Embodiment example 3

[0039] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.2wt%, ZnO: 5.82wt%, MnO: the remainder, the main component was ball milled for 1 hour, and pre-fired at 930°C for 2 hours to obtain a black powder; Subcomponents, the content of subcomponents is calculated as the first type of subcomponents in terms of oxides: SiO 2 : 500ppm,, Al 2 o 3 : 1000ppm, secondary component of the second category: Bi 2 o 3 : 1500ppm, WO 3 : 500ppm, the third type of subcomponent: Co 2 o 3 : 1000ppm, In 2 o 3 : 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 ...

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Abstract

The invention discloses a MnZn soft magnetic ferrite material with high frequency, low temperature coefficient and low loss and a preparation method thereof. The material employs 68 wt%-72 wt% of Fe2O3, 5 wt%-9 wt% of ZnO, and the balance MnO as main components, and is prepared by steps of first ball milling, first sintering, second material preparing, second ball milling, granulation, compaction molding, second sintering and the like. The innovativeness of the invention is that by appropriate component proportions, ion composite doping and substituting and material preparation technology, a domain-wall-free structure is formed, domain wall resonance is inhibited, and the obtained MnZn power magnetic ferrite can work at a frequency highest to 5 MHz, and the material has relatively high temperature stability and relatively low power loss.

Description

technical field [0001] The invention relates to a MnZn soft magnetic ferrite material with high frequency, low temperature coefficient and low loss and a preparation method thereof, belonging 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 fe...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/64
CPCC04B35/2633C04B35/265C04B35/622C04B35/64C04B2235/3208C04B2235/3217C04B2235/3232C04B2235/3239C04B2235/3244C04B2235/3251C04B2235/3256C04B2235/3258C04B2235/3262C04B2235/3275C04B2235/3284C04B2235/3293C04B2235/3298C04B2235/3418C04B2235/656
Inventor 严密霍骅鑫白国华包大新
Owner ZHEJIANG UNIV
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