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Magnanese-zinc ferrite magnetic core

A ferrite core, manganese-zinc technology, applied in the fields of transformer/inductor core, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc. Problems such as large anisotropy, to achieve the effect of convenient source and simple production process

Inactive Publication Date: 2003-03-12
无锡晶石磁性电子器件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Magnanese-zinc ferrite magnetic core
  • Magnanese-zinc ferrite magnetic core
  • Magnanese-zinc ferrite magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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

[0049] 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

[0050] sample 19

Embodiment 3

[0052] 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

[0053] table 3

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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 manganese-zinc system ferrite core, which belongs 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 or more of P and B, a...

Claims

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Application Information

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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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