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Method for preparing magnanese-zinc ferrite magnetic core

A technology for ferrite cores and manufacturing methods, which is applied in the direction of inductance/transformer/magnet manufacturing, transformer/inductor cores, and the magnetism of inorganic materials, which can solve the problem of large magnetic anisotropy and cannot fundamentally achieve magnetic materials. Microstructure optimization and other issues to achieve the effect of simple production process and convenient source

Inactive Publication Date: 2004-12-29
无锡晶石磁性电子器件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the NiO content is as high as 0.45% by weight, the magnetic anisotropy is relatively large, and the resistivity is generally only between 6-10Ωm
In order to achieve high frequency and high efficiency of the transformer, it is required to further increase the resistivity, and the additive components contained in it are micron-scale materials, so it is impossible to fundamentally optimize the microstructure of magnetic materials.

Method used

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  • Method for preparing magnanese-zinc ferrite magnetic core
  • Method for preparing magnanese-zinc ferrite magnetic core
  • Method for preparing magnanese-zinc ferrite magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Will Fe 2 o 3 (53.5 mole %), ZnO (9.5 mole %) and MnO (37 mole %) carry out batching as main component, add dispersing agent simultaneously: polypropionic acid 0.5 weight %, antifoaming agent: n-octanol 0.2 weight %, deionized water 95% by weight, after they are mixed, add binder: polyvinyl alcohol 0.8% by weight solution, mix 70-80 minutes in the high-speed mixer, become about 100 microns in average particle diameter by spray drying mechanism, moisture content is in Granules below 0.1% by weight and with a flow angle of less than 40 degrees; pre-fired in a rotary kiln at a temperature of 925°C for 1.5-2.0 hours; dry or wet pulverized for 25-35 minutes to make an average particle The diameter is the powder of 1.5-2.0 micron; Add nano-scale material additives: calcium oxide (CaO): 0.06% by weight, silicon dioxide (SiO 2 ): 0.015% by weight. The above CaO and SiO 2 is the final composition of the magnetic material. The particle size range of nanoscale material additi...

Embodiment 2

[0057] In the composition of the manganese-zinc-based ferrite core in Example 1, the relative main component is a nanoscale material additive component except CaCO 3 and SiO 2 , also contains Nb 2 o 5 、 Ta 2 o 5 , V 2 o 5 and ZrO 2 Samples 8-20 were obtained by using the manufacturing method of Example 1. Each obtained sample was evaluated similarly to Example 1. The results are listed in Table 2

[0058] Table 2

[0059]

Embodiment 3

[0061] In the composition of the manganese-zinc-based ferrite core of Example 1, CaCO 3 and SiO 2 , also contains nanomaterials: SnO 2 or TiO 2 , using the manufacturing method of Example 1, to obtain samples 21-26; P or B, to obtain samples 27 and 32. Each obtained sample was evaluated similarly to Example 1. The results are listed in Table 3

[0062] table 3

[0063]

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Abstract

A MnZn ferrite core is prepared from Fe2O3 (52-55 mol%), ZnO (7-12 mol%), MnO (36-38 mol%), nano CaO (0.01-0.5 wt.%), and SiO2 (0.004-0.03 wt.%) through sintering at 1150-1300 deg.C for 0.5-5 hr. Its advantages are high high-frequency performance, higher saturated magnetic flux density and low magnetic loss.

Description

Technical field: [0001] The invention relates to a manufacturing method of a manganese-zinc system ferrite core, belonging to the technical field of oxide magnetic materials. Background technique: [0002] With the rapid development of the communication field, MnZn ferrite must have special electromagnetic, mechanical and thermal properties as a material for converters, transformers and chokes in high-frequency technology. Ferrite cores used in high-frequency power transformers, especially high-frequency and high-efficiency transformers with frequencies below 3 MHz, require low core loss Pcv and higher saturation flux density Bms to meet the needs of current electrical equipment. miniaturization and high efficiency requirements. [0003] Before the present invention is made, in prior art, application number 00126316.1 proposes a kind of Fe 2 o 3 The basic composition of , MnO and ZnO contains SiO 2 , CaO and NiO ferrites that also contain Nb 2 o 5 , ZrO 2 , one or two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/22H01F1/34H01F27/24H01F41/02
Inventor 董斌黄国祥黄舰
Owner 无锡晶石磁性电子器件有限公司
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