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Magnetic bead powder and preparation method thereof and laminated magnetic bead and preparation method thereof

A magnetic bead and powder technology, which is applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of single preparation materials, low impedance, and limited application of magnetic beads

Active Publication Date: 2020-10-16
BEIJING RAILWAY SIGNAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ferrite materials are iron-magnesium alloys or iron-nickel alloys, and there is a problem of single preparation materials, which limits the further application of magnetic beads
As typical metal magnetic materials, Fe, Co, Ni and their alloy materials have high magnetic permeability, but their impedance is low, so they cannot be better applied in the preparation of magnetic beads

Method used

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  • Magnetic bead powder and preparation method thereof and laminated magnetic bead and preparation method thereof
  • Magnetic bead powder and preparation method thereof and laminated magnetic bead and preparation method thereof

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preparation example Construction

[0028] The invention provides a kind of preparation method of magnetic bead powder, comprises the following steps:

[0029] A) mixing aluminum sulfate, potassium aluminate, sodium acetate and acetic acid in water to obtain a mixed solution;

[0030] The concentration of aluminum sulfate in the mixed solution is 0.003-0.2mol / L, the concentration of potassium aluminate is 0.03-0.2mol / L, the concentration of sodium acetate is 0.017-0.03mol / L, and the concentration of acetic acid is 0.03-0.1mol / L;

[0031] B) immersing the pickled magnetic metal particles in the mixed solution, adding sodium hydroxide, and reacting under stirring conditions;

[0032] C) drying the solid product obtained in step B) and then calcining to obtain a base material with a core-shell structure;

[0033] D) AlN, Bi 2 o 3 , ZrO 2 , SiO 2 , MnO 2 and Co 3 o 4 Ball milling and mixing to obtain additives;

[0034] E) mixing base material and additive to obtain magnetic bead powder.

[0035] Magneti...

Embodiment 1

[0079] (A) base material preparation (taking about 10g of base material preparation as an example)

[0080] (1) Prepare 200mL of 0.01mol / L aluminum sulfate solution; 200mL of potassium aluminate, whose concentration is 0.4mol / L; 100mL of sodium acetate, whose concentration is 0.1mol / L, 100mL of acetic acid, whose concentration is 0.4mol / L, mix into a 600mL solution and stir evenly;

[0081] (2) Weigh 10 g of Co metal particles with a particle size of 5 μm. Wash the weighed magnetic metal in a hydrochloric acid solution with a dilution concentration of 0.01mol / L for 10 minutes to remove surface scale and impurities, and at the same time form uneven pits on the particle surface;

[0082] (3) Put the magnetic metal particles in the above (2) into the solution prepared in the above (1);

[0083] (4) Slowly add 20mL of sodium hydroxide solution in the above (3), the ratio of its concentration to the concentration of aluminum sulfate is 0.1:1. During this process, the solution is ...

Embodiment 2

[0093] (A) Base material preparation (take about 10g of base material preparation as an example)

[0094] (1) Prepare 200 mL of 0.1 mol / L aluminum sulfate solution; 200 mL of potassium aluminate, whose concentration is 0.6 mol / L; 100 mL of sodium acetate, whose concentration is 0.2 mol / L, 100 mL of acetic acid, whose concentration is 0.5 mol / L, mix into a 600mL solution and stir evenly;

[0095] (2) Weigh 10 g of Fe particles with a particle size of 10 μm. Wash the weighed magnetic metal in a hydrochloric acid solution with a dilution concentration of 0.01mol / L for 10 minutes to remove surface oxide scales and impurities, and at the same time form uneven pits on the surface of the particles;

[0096] (3) Put the magnetic metal particles in the above (2) into the solution prepared in the above (1);

[0097] (4) Slowly add 20mL of sodium hydroxide solution in the above (3), the ratio of its concentration to the concentration of aluminum sulfate is 10:1, the solution is stirred...

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Abstract

The invention provides a magnetic bead powder preparation method, which comprises the following steps of A) mixing aluminum sulfate, potassium aluminate, sodium acetate and acetic acid in water to obtain a mixed solution, B) immersing the magnetic metal particles subjected to acid pickling into the mixed solution, adding sodium hydroxide, and reacting under a stirring condition, C) drying the solid product obtained in the step B), and calcining to obtain a base material with a core-shell structure, D) carrying out ball milling and mixing on AlN, Bi2O3, ZrO2, SiO2, MnO2 and Co3O4 to obtain an additive, and E) mixing the base material with the additive to obtain the magnetic bead powder. The metal magnetic material is made into an M@Al2O3 core / shell structure, and the shell / core structure material not only maintains the specific high permeability of the metal magnetic material, but also has higher impedance characteristic due to the existence of the insulating shell. The invention further provides magnetic bead powder, a laminated magnetic bead and a preparation method thereof.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic materials, and in particular relates to a magnetic bead powder and a preparation method thereof. Stacked magnetic beads and preparation method thereof. Background technique [0002] As a widely used component, magnetic beads have the function of absorbing high-frequency harmonics in the circuit. The function of magnetic beads is mainly to eliminate RF noise existing in the transmission line structure (circuit). RF energy is superimposed on the DC transmission level. The AC sine wave component and the DC component are useful signals that are needed. To remove these unwanted signal energies, chip beads are used to act as high-frequency resistors (attenuators). [0003] Magnetic beads have high resistivity and permeability, which is equivalent to series connection of resistance and inductance, but both resistance and inductance change with frequency. It has better high-frequency filtering ...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F41/02B22F1/00B22F1/02
CPCH01F1/1475H01F41/02B22F1/16B22F1/145
Inventor 温术来于树永赵寰宇范佳斌卢江
Owner BEIJING RAILWAY SIGNAL
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