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Anti-interference magnesium-zinc ferrite and producing method

A manufacturing method and ferrite technology, applied in the direction of inorganic materials such as magnetism, can solve the problems of low resistivity, high cost and high price, and achieve the effect of high resistivity coefficient, low price and wide application range

Inactive Publication Date: 2005-03-02
秦会斌 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3. For MnZn ferrite materials, due to their low resistivity, generally ρ = 10 ~ 1000 (ohm cm), the use frequency is below 0.1MHz
However, one of its Achilles' heels is its high cost, and the raw materials used include) expensive NiO (3-6mol%), generally more than 80,000 yuan / ton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, MgO, ZnO, Fe 2 o 3 Dosing for the main components, get 27mol% (calculated by MgO) of magnesium oxide, 13mol% (calculated by ZnO) of zinc oxide, 30mol% (calculated by Fe 2 o 3 Calculation) iron oxide was mixed, and the uniformly mixed mixture was calcined at 1000°C for 90 minutes. Then add additives: 50ppm (according to SiO 2 Calculation) of silicon oxide, 50ppm (calculation of CaO) is calcium oxide. After crushing and mixing, add binder and mix and use spray granulation method to obtain particles with an average particle size of 180 microns directly, and press the granulated particles to obtain the required anti-EMI magnetic core sample, and then gradually increase the temperature to 1350 ° C , and sintered at 1350°C for 2 hours, and the fired sample was obtained after cooling down. The measurement results of the magnetic permeability of the sample are (using a ring-shaped sample of outer diameter × inner diameter × height = 14 × 7.8 × 10mm3, tested by Agile...

Embodiment 2

[0026] Also for MgO, ZnO, Fe 2 o 3 Carry out batching for main component, get the magnesium oxide of 18mol% (calculated by MgO), the zinc oxide of 16.7mol% (calculated by ZnO), 32.7mol% (calculated by Fe 2 o 3 Calculation) iron oxide was mixed, and the uniformly mixed mixture was calcined at 1050° C. for 60 minutes. Then add the subcomponents, wherein the subcomponents have 1mol% (calculated by NiO) of nickel oxide, 2.7mol% (calculated by CuCO 3 Calculation) of copper carbonate, 2.7mol% (according to MnCO 3 Calculation) of manganese carbonate. Among them, the additive has 1mol% (according to SiO 2 Calculated) of silicon oxide, 0.6mol% (calculated as CaO) of calcium oxide, 0.3mol% (calculated as Al 2 o 3 Calculation) of alumina. After crushing and mixing, add binder and mix and use spray granulation method to obtain particles with an average particle size of 180 microns directly, and press the granulated particles to obtain the ring-shaped sample required for parameter ...

Embodiment 3

[0029] The samples were first compared with MgO, ZnO, Fe 2 o 3Carry out batching for main component, get the magnesium oxide of 8.3mol% (calculated by MgO), the zinc oxide of 13.3mol% (calculated by ZnO), 36.7mol% (calculated by Fe 2 o 3 Calculation) of iron oxide is mixed. Then add the subcomponents, wherein the subcomponents have 0.77mol% (calculated by NiO) of nickel oxide, 0.9mol% (calculated by CuCO 3 Calculation) of copper carbonate, 3.3mol% (according to MnCO 3 Calculation) of manganese carbonate, mixed. The homogeneously mixed mixture was calcined at 1100° C. for 60 minutes. After crushing and mixing, add binder and mix and use spray granulation method to obtain particles with an average particle size of 180 microns directly, and press the granulated particles to obtain the ring-shaped sample required for parameter testing; gradually increase the temperature to 1320 ° C, And heat-preserve and sinter at 1320°C for 2.5 hours, and obtain a fired sample after cooling...

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Abstract

The anti-interference magnesium-zinc ferrite is produced with MgO, ZnO and Fe2O3 in certain proportion as main material, and through mixing, calcining at 1000-1200 deg.c for 30-90 min, adding supplementary material, crushing, mixing, adding adhesive, spray pelletizing to obtain grains of 180 micron average size, pressing to form magnetic core, sintering at 1250-1350 deg.c for 2-5 hr and cooling. The present invention has simple production process, and the produced magnesium-zinc ferrite has high initial magnetic permeability, high resistivity, excellent magnetic curve characteristic, low cost, wide application range and good use effect.

Description

technical field [0001] The invention relates to a magnesium-zinc (MgZn) anti-interference magnetic core ferrite and a manufacturing method, which has an initial magnetic permeability higher than 100 at 5 MHz to 25 MHz, and a resistivity coefficient as high as 10 7 ~10 8 (ohm cm) above, and has excellent magnetic spectrum curve characteristics, mainly used for anti-interference core ferrite materials. Background technique [0002] When traditional manganese-zinc (MnZn) ferrite is used as anti-interference core ferrite (anti-EMI) material, the resistivity ρ of MnZn ferrite is generally 10 1 ~10 3 (ohm cm), due to the low resistivity, the eddy current loss of MnZn ferrite is large when it is used at high frequency, and the magnetic permeability drops to 1 rapidly, which makes MnZn ferrite basically useless when used at high frequency. Can be used in low frequency band. In fact, MnZn ferrite can be used in a very small range of anti-EMI devices, and NiZn ferrite materials ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/36C04B35/622H01F1/34
Inventor 秦会斌周继军
Owner 秦会斌
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