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Preparation method and application of high-plane anisotropic Fe3C high-frequency soft magnetic material

A soft magnetic material, anisotropic technology, used in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of serious eddy current loss, plastic deformation and crushing of magnetic powder, etc., to improve the natural resonant frequency and magnetic properties. Conductivity, achieve high-frequency electromagnetic loss, and improve the effect of material utilization.

Pending Publication Date: 2022-03-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thickness of flake soft magnetic particles prepared by traditional ball milling method is relatively thick, and its size is larger than the skin depth at GHz frequency, and the eddy current loss is serious.
Chinese patent (CN 105834440A) discloses a multi-stage ball milling method. It is found that during the ball milling process, the magnetic powder will not only be plastically deformed, but also broken and cold-welded, which eventually leads to a part of the magnetic powder that cannot be completely planarized and cannot meet high magnetic permeability. requirements

Method used

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  • Preparation method and application of high-plane anisotropic Fe3C high-frequency soft magnetic material
  • Preparation method and application of high-plane anisotropic Fe3C high-frequency soft magnetic material
  • Preparation method and application of high-plane anisotropic Fe3C high-frequency soft magnetic material

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Put the eutectoid steel block (length*width*height=2*1*0.5cm) into the heating furnace and heat it to 750°C, and the holding time is 4h, so that the original structure is completely transformed into austenite and homogenized;

[0030] (2) Put the fully austenitized eutectoid steel block into the salt bath furnace for isothermal annealing quickly, and set the isothermal annealing temperature to 700°C;

[0031] (3) The eutectoid steel block after the heat treatment is put into the mixed solution of potassium chloride of 15g / L and 0.15g / L of citric acid as the working electrode, the platinum mesh is used as the counter electrode, and the mercurous sulfate electrode is used as the reference electrode. The steel block was corroded by chronoamperometry, the initial voltage was set to -0.2V, the mixed solution was replaced every 6 hours, and the electrochemical corrosion time was 45 hours;

[0032] (4) Use a mixed solution of hydrochloric acid and absolute ethanol to clean...

Embodiment 2

[0035] (1) Put the hypoeutectoid steel block into the heating furnace and heat it to 800°C, and the holding time is 3h, so that the original structure is completely transformed into austenite and homogenized;

[0036] (2) Put the fully austenitized hypoeutectoid steel block into the salt bath furnace for isothermal annealing quickly, and set the isothermal annealing temperature to 550°C;

[0037] (3) The hypoeutectoid steel block after heat treatment is placed in a mixed solution of potassium chloride with a concentration of 90g / L and citric acid of 0.45g / L as a working electrode, a platinum mesh as a counter electrode, and a mercurous sulfate electrode as a reference electrode , using chronoamperometry to corrode small squares, set the initial voltage to -0.4V, replace the mixed solution every 7 hours, and the electrochemical corrosion time is 75 hours;

[0038] (4) Use a mixed solution of hydrochloric acid and absolute ethanol to clean and centrifuge the corrosion products, ...

Embodiment 3

[0041] (1) Put the hypereutectoid steel block into the heating furnace and heat it to 900°C, and the holding time is 5h, so that the original structure is completely transformed into austenite and homogenized;

[0042] (2) Put the fully austenitized hypereutectoid steel block into the salt bath furnace for isothermal annealing, and set the isothermal annealing temperature to 625°C;

[0043](3) The hypereutectoid steel block after heat treatment is placed in a mixed solution of potassium chloride with a concentration of 70g / L and citric acid of 0.35g / L as a working electrode, a platinum mesh as a counter electrode, and a mercurous sulfate electrode as a reference electrode , using chronoamperometry to corrode small squares, set the initial voltage to -0.6V, replace the mixed solution every 7 hours, and the electrochemical corrosion time is 52 hours;

[0044] (4) Use a mixed solution of hydrochloric acid and absolute ethanol to clean and centrifuge the corrosion products, and th...

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Abstract

The invention provides a preparation method and application of a high-plane anisotropic Fe3C high-frequency soft magnetic material, and belongs to the technical field of preparation of high-frequency soft magnetic materials. According to the preparation method, a heat treatment and electrochemical corrosion combined method is adopted, and the preparation method is simple, low in cost, high in material conversion rate and easy for large-scale production. And meanwhile, the thickness of the Fe3C sheet layer is regulated and controlled by controlling a heat treatment process, so that the natural resonance frequency of the Fe3C sheet layer is accurately tuned in a range of 9-12GHz, and excellent high-frequency electromagnetic loss characteristics are realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-frequency soft magnetic materials, in particular to a high-plane anisotropy Fe 3 C Preparation method and application of high-frequency soft magnetic materials. Background technique [0002] Soft magnetic materials are widely used in the fields of energy, information, transportation, medical treatment and national defense, and are the key basic materials of the national economy. Among them, the soft magnetic materials used in the field of electronic information and communication technology aim to solve the increasingly serious problem of electromagnetic pollution. With the advent of the 5G era, the application frequency of related electronic devices has been extended from MHz to GHz, which puts forward new requirements for the magnetic properties of soft magnetic materials. Therefore, the development of soft magnetic materials with excellent loss performance at high frequencies has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F41/00C21D1/26C25F3/06
CPCH01F1/147H01F41/00C21D1/26C25F3/06
Inventor 张雪峰李逸兴张政宇廖怡君孙卓
Owner NORTHEASTERN UNIV