A method for fabricating metal soft magnetic composites with high permeability and low power consumption by surface oxidation process

A composite material and surface oxidation technology, which is applied in the fields of metal processing equipment, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of low heat resistance temperature, poor bonding of insulating film, etc., and achieve low production cost and magnetic Small dilution effect and simple preparation process

Inactive Publication Date: 2019-01-22
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of poor insulation film bonding and low heat-resistant temperature of current soft magnetic composite materials, the present invention provides a surface oxidation and insulation coating treatment method for metal soft magnetic composite materials. layer compact oxide film, the technical scheme of the present invention is as follows:

Method used

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  • A method for fabricating metal soft magnetic composites with high permeability and low power consumption by surface oxidation process
  • A method for fabricating metal soft magnetic composites with high permeability and low power consumption by surface oxidation process
  • A method for fabricating metal soft magnetic composites with high permeability and low power consumption by surface oxidation process

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Add 9 g of sodium nitrite to 30 g of deionized water, add a buffer solution prepared by acetic acid and sodium acetate, adjust the pH of the solution to 4, and stir evenly for 20 min to obtain an oxidation solution. After sieving 15 g of iron powder for particle size proportioning, add it to the passivation solution and stir uniformly for 20 minutes, then filter and dry to obtain oxidized magnetic powder. The oxidized magnetic powder is added with a binder that accounts for 1.0% of the mass of the oxidized magnetic powder, and the mixture is fully stirred under heating until the mixture is dry and uniform. The binder is silicone resin. Then, 0.5% of the total weight of the oxidized magnetic powder is added to the oxidized magnetic powder with a mold release agent that is evenly mixed. The mold release agent is zinc stearate to obtain the magnetic powder to be molded. The magnetic powder to be formed is pressed into a ring-shaped soft magnetic composite material with an o...

Embodiment 2

[0028] Add 6 g of sodium nitrate to 20 g of deionized water, add a buffer solution prepared by acetic acid and sodium acetate, adjust the pH of the solution to 6, and stir evenly for 30 minutes to obtain an oxidation solution. Pass 20 g sendust powder through a sieve for particle size proportioning and add it to the passivation solution, while uniformly stirring for 30 min, then filter and dry to obtain oxidized magnetic powder. A binder accounting for 1.5% of the mass of the oxidized magnetic powder is added to the oxidized magnetic powder, and the mixture is fully stirred under heating until the mixture is dry and uniformly mixed. The binder is a phenolic resin. Then, a release agent that accounts for 1.0% of the total weight of the oxidized magnetic powder is added to the oxidized magnetic powder and mixed uniformly. The release agent is barium stearate to obtain the magnetic powder to be molded. Press the magnetic powder to be formed into a ring-shaped soft magnetic composi...

Embodiment 3

[0036] Add 10 g of potassium permanganate to 25 g of deionized water, add a buffer solution prepared by acetic acid and sodium acetate, adjust the pH of the solution to 5, and stir evenly for 30 min to obtain an oxidation solution. After sieving 25 g of iron-silicon powder for particle size proportioning, add it to the passivation solution and stir it evenly for 40 minutes, then filter and dry to obtain oxidized magnetic powder. The oxidized magnetic powder is added with a binder that accounts for 2.0% of the mass of the oxidized magnetic powder, and the mixture is fully stirred under heating until the mixture is dry and uniform. The binder is silicone resin. Then, a release agent accounting for 1.5% of the total weight of the oxidized magnetic powder is added to the oxidized magnetic powder and mixed uniformly. The release agent is zinc stearate to obtain the magnetic powder to be molded. The magnetic powder to be formed is pressed into a ring-shaped soft magnetic composite ma...

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Abstract

The invention discloses a method for fabricating metal soft magnetic composites with high permeability and low power consumption by surface oxidation process. A dense oxide film was coated on the surface of metal magnetic powder by surface oxidation, and a new soft magnetic composite was obtained by bonding, pressing, heat treatment and spraying. A surface oxidation method is adopted to insulate and coat that metal magnetic powder, the coat film thickness is on the nanometer level, the coating is uniform, the bonding strength is high, the metal magnetic powder is not easy to fall off, and themetal magnetic pow has high thermal stability and high resistivity, and has high saturation magnetic flux density and high permeability because the coating film is thin. The coating effect is better than the existing method, the process is simple and feasible, suitable for industrial production.

Description

Technical field [0001] The invention relates to the technical field of the preparation of magnetic materials, in particular to an in-situ surface oxidation coating treatment method of a metal soft magnetic composite material. Background technique [0002] Metal soft magnetic composite material is a soft magnetic material made by mixing metal magnetic powder and insulating medium by powder metallurgy technology. When applied to high frequency, the loss of soft magnetic composite material is dominated by eddy current loss. Eddy current loss will generate a large amount of Joule heat, causing deterioration of the magnetic properties of soft magnetic materials. In order to reduce the eddy current loss, it is necessary to evenly coat a high-resistivity insulating layer on the surface of the metal magnetic powder to block the eddy current inside the magnetic powder particles, thereby effectively reducing the eddy current loss under high frequency. [0003] Including organic coating and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/00H01F41/02B22F1/00
CPCH01F1/33H01F41/00H01F41/0246B22F1/145
Inventor 刘冬高善民王峰刘桂静钟琳琳
Owner SHANDONG UNIV OF TECH
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