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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. The effect of low cost, high DC resistivity, high Curie temperature

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

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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

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Embodiment Construction

[0026] Embodiment 1-4 and comparative example 1 are based on Fe 2 o 3 , Mn 3 o 4 , ZnO as the main component, ferrite materials obtained by adding different amounts of each main component, placed in a ball mill and mixed for 0.5 hours, then taken out and dried. The obtained powder was pre-fired at 900°C for 2.5 hours in a box-type resistance furnace. Then put the pre-fired powder into a ball mill, based on the total weight of the main component, add an auxiliary component to the resulting powder: 0.008wt% SiO 2 , 0.02wt% CaCO 3 , 0.30wt% Co 2 o 3 ; Then add 50wt% deionized water and 1.5wt% dispersant to account for the total weight of the main component and carry out ball milling together. Ball mill the powder until the average particle size is about 1.0±0.2 μm; based on the total weight of the powder after ball milling, add 7wt% polyvinyl alcohol solution to the powder, mix uniformly and granulate, and press the granules into A circular sample of OR25×8-15mm. Finally...

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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 1000 ohm.m, the Curie temperature of above 150 DEG C, the normal-temperature saturation flux density of above 420 mT and the initial permeability of above 2000, and also has the characteristic 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 DC resistivity, high Curie temperature and high saturation magnetic induction, and high impedance 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, more and more attention has been paid to the electromagnetic interference of electronic products. An effective way to solve or reduce electromagnetic pollution and improve the ability of electronic equipment to resist electromagnetic interference is to adopt electromagnetic compatibility design, which requires A large number of electromagnetic interference (EMI) resistant materials are used. [0003] Commonly used anti-EMI materials include MnZn ferrite and NiZn ferrite materials. Compared with NiZn ferrite magnets, the resistivity of MnZn ferrite is relatively low, b...

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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