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Composite silicone rein-ferrite-coating soft magnetic powder core and preparation method thereof

A technology of silicone resin and composite coating agent, applied in the direction of magnetism of inorganic materials, can solve the problems of high temperature annealing, uneven coating of insulating film, low magnetic permeability of soft magnetic powder core, etc., and achieve high magnetic permeability. rate, improve adhesion, improve the effect of resistivity

Inactive Publication Date: 2013-06-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned problems of uneven coating of insulating film, low magnetic permeability of soft magnetic powder core and inability to perform high temperature annealing, the purpose of the present invention is to provide a kind of The method of preparing soft magnetic powder cores with bulk powder as an organic-inorganic composite coating agent not only considers its insulation properties in the selection of insulating media, but also utilizes the soft magnetic properties of inorganic coating media and the high temperature resistance of organic coating media characteristic

Method used

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  • Composite silicone rein-ferrite-coating soft magnetic powder core and preparation method thereof
  • Composite silicone rein-ferrite-coating soft magnetic powder core and preparation method thereof
  • Composite silicone rein-ferrite-coating soft magnetic powder core and preparation method thereof

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Effect test

Embodiment 1

[0035] (1) Select 100g of industrially produced reduced iron powder with a particle size distribution of 100-500 mesh and an Fe element content greater than 98%, wash the iron powder three times with analytical pure acetone solution, and place the cleaned iron powder in a PH=9 In dilute ammonia solution, stir at 40-60°C for 15-30 minutes to obtain surface-modified iron powder;

[0036] (2) Put the surface-modified iron powder into the silane coupling agent diluent, the mass ratio of coupling agent to iron powder is 1:100, and the diluent of the coupling agent diluent is 5vol% deionized Water and 95vol% alcohol, after rapid stirring for 2 hours, wash with alcohol three times to remove excess silane coupling agent, and then vacuum dry at 50°C for 1 hour;

[0037] (3) According to the nominal formula Mn 0.8 Zn 0.2 Fe 2 o 4 Dissolve the corresponding manganese nitrate, zinc nitrate and ferric nitrate (all of analytical grade) in 600ml of deionized water, then add citric acid a...

Embodiment 2

[0043] (1) Select 100g of industrially produced reduced iron powder with a particle size distribution of 100-500 mesh and an Fe element content greater than 98%, wash the iron powder three times with analytical pure acetone solution, and place the cleaned iron powder in a PH=9 In dilute ammonia solution, stir at 40-60°C for 15-30 minutes to obtain surface-modified iron powder;

[0044] (2) Put the surface-modified iron powder into the silane coupling agent diluent, the mass ratio of coupling agent to iron powder is 1:100, and the diluent of the coupling agent diluent is 5vol% deionized Water and 95vol% alcohol, after rapid stirring for 2 hours, wash with alcohol three times to remove excess silane coupling agent, and then vacuum dry at 50°C for 1 hour;

[0045] (3) According to the nominal formula Ni 0.5 Zn 05 Fe 2 o 4 Dissolve the corresponding nickel nitrate, zinc nitrate and ferric nitrate (all analytically pure) in 800ml of deionized water, then add citric acid at a mo...

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Abstract

The invention discloses a composite silicone rein-ferrite-coating soft magnetic powder core and a preparation method thereof, and belongs to the metallurgical industry of magnetic functional material and powder. The soft magnetic powder core is formed by pressing and forming composite magnetic particles, wherein each composite magnetic particle comprises a soft magnetic metal particle and a composite insulation film, and each composite insulation film is coated on the surface of each soft magnetic metal particle. The preparation method of the soft magnetic powder core comprises the following steps of surface modification and coupling treatment of the soft magnetic metal particles, forming of the composite insulation coating around each soft magnetic metal particle, pressing and forming, and high-temperature heat treatment at 300 DEG C to 650 DEG C. Compared with the prior art, the soft magnetic powder core and the preparation method have the advantages that the adopted organic resin can resist the high temperature of 600 DEG C; since the soft magnetic ferrite power is added into the composite coating agent, the damage of the insulation layer to the magnetic performance of a substrate is reduced; and the magnetic conductivity is high, the density is high, the rapture strength is high, the loss is low, and the industrial production is easy.

Description

technical field [0001] The invention provides a silicone resin-ferrite composite coated soft magnetic powder core and a preparation method thereof, belonging to the magnetic functional material and powder metallurgy industries. Background technique [0002] Soft magnetic magnetic powder core is a kind of soft magnetic material obtained by using magnetic particles as raw materials, coating the surface of the particles with an insulating medium layer, pressing the powder into the required shape by powder metallurgy technology, and heat treatment. Compared with the traditional silicon steel sheet, the soft magnetic powder core has the advantages of three-dimensional isotropy (3D), low eddy current loss, relatively low total loss in the medium and high frequency range, good frequency characteristics and easy machining, etc. Use it for high-frequency AC devices in the kHz-MHz range (such as power transformers, audio transformers, AC and RF filter inductors), broadband RF transfor...

Claims

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Application Information

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IPC IPC(8): H01F1/24C04B35/26C04B35/626
Inventor 孙爱芝吴深邹超董娟杨俊邢彦兴
Owner UNIV OF SCI & TECH BEIJING
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