Iron-silicon-aluminum magnetic powder core microwave insulation coating method and insulation coating magnetic powder core

An insulating coating and sendust technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of low efficiency and poor effect of magnetic powder core coating, and achieve stable molding strength and powder core sensitivity Sexuality, easy technology promotion, convenient and simple preparation

Pending Publication Date: 2021-04-30
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low efficiency and poor effect of magnetic powder core coating in the prior art, the present invention provides a microwave insulation coating method for sendust magnetic powder core and insulation coated magnetic powder core

Method used

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  • Iron-silicon-aluminum magnetic powder core microwave insulation coating method and insulation coating magnetic powder core
  • Iron-silicon-aluminum magnetic powder core microwave insulation coating method and insulation coating magnetic powder core
  • Iron-silicon-aluminum magnetic powder core microwave insulation coating method and insulation coating magnetic powder core

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Experimental program
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Effect test

Embodiment 1

[0039] A microwave insulation coating method for sendust magnetic powder core, comprising the following steps:

[0040] S1: Preparation of mixed slurry: use sendust magnetic powder with a particle size of less than 200 meshes prepared by gas atomization as raw material, the raw material is 1000 g, and based on the mass of the sendust magnetic powder, add polyvinyl alcohol with a concentration of 2.0% Solution 150g, SiO 2 5g powder, stirred at room temperature for 3 minutes, and stirred evenly to form a mixed slurry;

[0041] S2: Microwave heating: Put the mixed slurry into a microwave heater with a microwave frequency of 2000MHz, and microwave for 10 minutes to obtain dry magnetic powder; sieve the dry magnetic powder with a 100-mesh sieve to remove large particles;

[0042] S3: Prepare the magnetic powder to be formed: add 1 g of binder silicone resin powder and 1 g of release agent zinc stearate to the dried magnetic powder after sieving, and mix evenly to obtain the magnet...

Embodiment 2

[0049] A microwave insulation coating method for sendust magnetic powder core, comprising the following steps:

[0050] S1: Preparation of mixed slurry: use sendust magnetic powder with a particle size of less than 200 meshes prepared by the gas atomization method as raw material, the raw material is 1000 g, and based on the mass of the sendust magnetic powder, add polyvinyl alcohol with a concentration of 3.0% Solution 120g, SiO 2 Powder 10g, stirred at room temperature for 5 minutes, and stirred evenly to form a mixed slurry;

[0051] S2: Microwave heating: Put the mixed slurry into a microwave heater with a microwave frequency of 2200 MHz, and heat it with microwave for 8 minutes to obtain dry magnetic powder; sieve the dry magnetic powder with a 100-mesh sieve to remove large particles;

[0052] S3: Prepare the magnetic powder to be formed: add 2 g of binder silicone resin powder and 2 g of release agent zinc stearate to the dried magnetic powder after sieving, and mix ev...

Embodiment 3

[0059] A microwave insulation coating method for sendust magnetic powder core, comprising the following steps:

[0060] S1: Preparation of mixed slurry: use sendust magnetic powder with a particle size of less than 200 meshes prepared by gas atomization as raw material, the raw material is 1000 g, and based on the mass of the sendust magnetic powder, add polyvinyl alcohol with a concentration of 5.0% Solution 90g, SiO 2 15g powder, stirred at room temperature for 7 minutes, and stirred evenly to form a mixed slurry;

[0061] S2: Microwave heating: put the mixed slurry into a microwave heater with a microwave frequency of 2300MHz, and microwave for 6 minutes to obtain dry magnetic powder; sieve the dry magnetic powder with a 100-mesh sieve to remove large particles;

[0062] S3: Prepare the magnetic powder to be formed: add 2.5g of binder silicone resin powder and 3g of release agent zinc stearate to the dried magnetic powder after sieving, and mix evenly to obtain the magneti...

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Abstract

The invention discloses an iron-silicon-aluminum magnetic powder core microwave insulation coating method and an insulation coating magnetic powder core, and belongs to the field of soft magnetic materials. Aiming at the problems of low coating efficiency and poor effect of the existing magnetic powder core, the invention provides the iron-silicon-aluminum magnetic powder core microwave insulation coating method which comprises the following steps of: preparing mixed slurry; carrying out microwave heating on the mixed slurry; adding an adhesive and a release agent into the heated mixed slurry to obtain to-be-formed magnetic powder; and pressing the to-be-formed magnetic powder, and carrying out heat preservation under inert gas to obtain the insulating coating magnetic powder core. The microwave heating technology is innovatively adopted, the surfaces of iron-silicon-aluminum metal particles can be evenly coated with SiO2 powder, and the insulation effect between the particles is achieved; compared with an existing coating process, the microwave heating technology is adopted, the insulation coating time can be greatly shortened, and the lossless insulation coating of the metal powder is achieved. And the effective magnetic conductivity of the prepared magnetic powder core is 75, the direct-current bias performance under the condition of 100Oe is higher than 48%, and the preparation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and more specifically relates to a microwave insulation coating method for a sendust magnetic powder core and an insulation coated magnetic powder core. Background technique [0002] Metal magnetic powder core is a kind of soft magnetic composite material obtained by mixing soft magnetic alloy powder with insulating material, pressing and heat treatment. Since the magnetic particles are separated by insulating material, the resistivity between the magnetic powder particles is increased, the eddy current between the magnetic powder is reduced, and the material can work at high frequency. Due to its low eddy current loss, strong anti-saturation ability, excellent frequency stability, and flexible design, metal soft magnetic powder cores are widely used in radar, television, power supplies and other fields, as inductive filters, frequency modulation chokes and switching power supplie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F27/255H01F1/147H01F1/24
CPCH01F41/0246H01F41/02H01F27/255H01F1/14791H01F1/24
Inventor 汤凤林陈杰裴晓东骆艳华
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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