Broadband high-impedance manganese-zinc ferrite material and preparation method thereof

A manganese-zinc ferrite, high-impedance technology, applied in the fields of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc. Effects of low cost, high DC resistivity, and high Curie temperature

Pending Publication Date: 2020-05-12
江门安磁电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, for the disclosed iron-poor MnZn ferrite material similar to the above, the main formula improves the low-frequency impedance through a high proportion of ZnO, or the auxiliary component adds CuO, NiO and other components to increase the frequency of use, but it will lead to a low Curie temperature, or Low frequency impedance low, high cost
[0005] It can be seen that the composition and preparation methods of ferrite materials in the prior art are difficult to coordinate simultaneously to obtain MnZn iron with high DC resistivity, high Curie temperature and high saturation magnetic induction characteristics, and high impedance characteristics in a wide frequency range. Oxygen materials, therefore, it is difficult to meet the use requirements in specific fields

Method used

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  • Broadband high-impedance manganese-zinc ferrite material and preparation method thereof
  • Broadband high-impedance manganese-zinc ferrite material and preparation method thereof
  • Broadband high-impedance manganese-zinc ferrite material and preparation method thereof

Examples

Experimental program
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Embodiment Construction

[0025] Examples 1-4 and Comparative Example 1 are based on Fe 2 O 3 , Mn 3 O 4 , ZnO as the main component, the ferrite material obtained with different addition amounts of each main component, put it in a ball mill and mix for 0.5 hours, then take it out and dry it. Using a box-type resistance furnace, the obtained powder was pre-fired at 900°C for 2.5 hours. Then put the pre-fired powder into a ball mill, and add an auxiliary component: 0.008wt% of SiO to the obtained powder based on the total weight of the main component 2 , 0.02wt% CaCO 3 , 0.30wt% Co 2 O 3 ; Then add 50wt% of deionized water and 1.5wt% of the dispersant based on the total weight of the main component for ball milling. Ball mill this powder to an average particle size of about 1.0±0.2μm; based on the total weight of the powder after ball milling, add 7wt% polyvinyl alcohol solution to the powder, mix uniformly to granulate, and compress the granules into OR25×8-15mm ring sample. Finally, in a bell furnace ...

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Abstract

The invention discloses a broadband high-impedance manganese-zinc ferrite material. The material comprises a main component and an auxiliary component, the main component comprises Fe2O3, ZnO and Mn3O4 (in terms of MnO), and the auxiliary component is selected from at least one of SiO2, CaCO3, Nb2O5, Co2O3 and TiO2. The manganese-zinc ferrite material has the direct-current resistivity of above 2,000 ohm.m, the Curie temperature of above 180 DEG C, the normal-temperature saturation magnetic induction intensity of above 430mT and the initial magnetic conductivity of above 1000, and also has thecharacteristic of high impedance in a broadband range of 0.01-700 MHz.

Description

Technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a manganese-zinc ferrite material with high direct current resistivity, high Curie temperature and high saturation magnetic induction characteristics, and high impedance characteristics in a wide frequency range, and a manufacturing method thereof. Background technique [0002] With the reduction of signal delay and the increase of signal frequency, the electromagnetic interference problem of electronic products has attracted more and more attention. The effective way to solve or reduce electromagnetic pollution and improve the anti-electromagnetic interference ability of electronic equipment is to adopt electromagnetic compatibility design. A lot of anti-electromagnetic interference (EMI) materials are used. [0003] Commonly used anti-EMI materials are MnZn ferrite and NiZn ferrite materials. Compared with NiZn ferrite, the resistivity of MnZn ferrite is relatively low, but...

Claims

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Application Information

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IPC IPC(8): C04B35/38C04B35/622H01F1/01H01F41/02
CPCC04B35/2633C04B35/265C04B35/622H01F1/01H01F41/02C04B2235/3418C04B2235/442C04B2235/3251C04B2235/3232C04B2235/96C04B2235/608C04B2235/66
Inventor 豆小明黄爱萍谭福清
Owner 江门安磁电子有限公司
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