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Preparation method of high-frequency high-impedance manganese zinc ferrite

A manganese-zinc ferrite, high-impedance technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of low impedance, low cut-off frequency, etc., to improve high-frequency performance and improve sintering Density and resistivity, loss reduction effect

Inactive Publication Date: 2019-06-18
NANTONG GUANYOUDA MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Patent 201310574134.X discloses a method for preparing manganese-zinc ferrite powder, but when the powder prepared by this method is sintered into magnetism, the impedance is not strong and the cut-off frequency is not high

Method used

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  • Preparation method of high-frequency high-impedance manganese zinc ferrite

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Experimental program
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Effect test

Embodiment 1

[0028] S1 ingredients, the following mass ratio ingredients: Fe 2 o 3 40wt%, MnO 30%, ZnO 25wt%, auxiliary materials 5wt%, auxiliary materials are dispersants and defoamers, and additives are also included. The additives include: SiO relative to the total weight of the main component 2 100ppm, CaCO 3 800ppm, Mo 3 O 500ppm, V 2 o 5 500ppm, CoO 100ppm;

[0029] S2 is dispersed, and the Fe in the above main components 2 o 3 , MnO, and ZnO material powders are wet-mixed evenly to obtain a slurry with a solid content of 50-70 wt %;

[0030] S3 sanding, the obtained slurry is sanded with pure water as a solvent;

[0031] S4 pressure filtration, dehydrating the sanded slurry to a moisture content of 10% to 20wt%;

[0032] S5 Extrusion granulation, the press-filtered powder is granulated by a twin-screw extruder, the diameter of the granulation is 1.5-12mm, and the length is 10-50mm;

[0033] S6 drying, drying the extruded granular raw material, the moisture content of th...

Embodiment 2

[0039] S1 ingredients, the following mass ratio ingredients: Fe 2 o 3 50wt%, MnO 30%, ZnO 15wt%, auxiliary materials 5wt%, auxiliary materials are dispersants and defoamers, and additives, additives include: SiO 2 120ppm, CaCO 3 860ppm, Mo 3 O 620ppm, V 2 o 5 530ppm, CoO 70ppm;

[0040] S2 is dispersed, and the Fe in the above main components 2 o 3 , MnO, and ZnO material powders are wet-mixed evenly to obtain a slurry with a solid content of 50-70 wt %;

[0041] S3 sanding, the obtained slurry is sanded with pure water as a solvent;

[0042] S4 pressure filtration, dehydrating the sanded slurry to a moisture content of 10% to 20wt%;

[0043] S5 Extrusion granulation, the press-filtered powder is granulated by a twin-screw extruder, the diameter of the granulation is 1.5-12mm, and the length is 10-50mm;

[0044] S6 drying, drying the extruded granular raw material, the moisture content of the material after drying is <3wt%;

[0045] The S7 rotary kiln is pre-fire...

Embodiment 3

[0050] S1 ingredients, the following mass ratio ingredients: Fe 2 o 3 55wt%, MnO 20%, ZnO 25wt%, auxiliary materials 5wt%, auxiliary materials are dispersants and defoamers, and additives, additives include: SiO 2 150ppm, CaCO 3 900ppm, Mo 3 O 700ppm, V 2 o 5 600ppm, CoO 150ppm;

[0051] S2 is dispersed, and the Fe in the above main components 2 o 3 , MnO, and ZnO material powders are wet-mixed evenly to obtain a slurry with a solid content of 50-70 wt %;

[0052] S3 sanding, the obtained slurry is sanded with pure water as a solvent;

[0053] S4 pressure filtration, dehydrating the sanded slurry to a moisture content of 10% to 20wt%;

[0054] S5 Extrusion granulation, the press-filtered powder is granulated by a twin-screw extruder, the diameter of the granulation is 1.5-12mm, and the length is 10-50mm;

[0055]S6 drying, drying the extruded granular raw material, the moisture content of the material after drying is <3wt%;

[0056] S7 rotary kiln pre-firing, the...

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Abstract

The invention discloses a preparation method of a high-frequency high-impedance manganese zinc ferrite. The preparation method sequentially includes the steps: S1 distribution; S2 dispersion; S3 sanding, to be specific, sanding obtained slurry with pure water serving as a solvent; S4 filter pressing, to be specific, performing filter pressing and dewatering on the sanded slurry; S5 extruding granulation, to be specific, granulating filter pressed powder by a double-screw extruder; S6 drying, to be specific, drying extruded particle raw materials; S7 presintering by a rotary kiln at the presintering temperature of 800-1000 DEG C for 30-60 minutes; S8 crushing and sanding, to be specific, crushing particles into 1-2 micrometers, adding auxiliary materials and additives, and sanding the materials into the particle size of 0.7-1.5 micrometers; S9 spray granulation and blank preparation, to be specific, performing spray granulation on the crushed and sanded slurry in the step S8 to obtain granules, and pressing the granules into a blank by a die; S10 sintering at the sintering temperature of 1000-1100 DEG C to obtain a finished product. The prepared manganese zinc ferrite is good in impedance performance and high in cut-off frequency, and the sintering temperature is greatly reduced.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a preparation method of high-frequency high-impedance manganese-zinc ferrite. Background technique [0002] Patent 201310574134.X discloses a method for preparing manganese-zinc ferrite powder, but when the powder prepared by this method is sintered into magnetism, the impedance is not strong and the cut-off frequency is not high. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of high-frequency high-impedance manganese-zinc ferrite to overcome the deficiencies of the prior art. [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] The embodiment of the present application discloses a method for preparing a high-frequency high-impedance manganese-zinc ferrite, which includes the following steps in sequence: [0006] S1 ingredients, the following mass ratio ingredients: Fe...

Claims

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Application Information

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IPC IPC(8): C04B35/38H01F1/01H01F41/00
Inventor 刘运戴加兵孟力曹照庆
Owner NANTONG GUANYOUDA MAGNET
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