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Double-shell insulation coating method of a metal soft magnetic composite material

A composite material and metal soft magnetic technology, applied in the direction of inorganic material magnetism, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problem of low heat resistance temperature of insulating film, reduce core loss and improve thermal stability , the effect of increasing the compact density

Active Publication Date: 2019-01-25
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiency that the heat-resistant temperature of the insulating film is not high in the current passivation process, and to provide a double-shell insulation coating method for metal soft magnetic composite materials

Method used

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  • Double-shell insulation coating method of a metal soft magnetic composite material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 15g of iron powder (i.e. metal magnetic powder), of which the iron powder with a particle size of -200 ~ +300 mesh accounts for 60% of the total mass, the iron powder of -300 ~ +400 mesh accounts for 30% of the total mass, and the iron powder above 400 mesh accounts for 10% of the total mass. Passivate the proportioned iron powder with phosphoric acid, stir and dry it in a water bath at 60° C. to obtain passivated magnetic powder, and the mass of phosphoric acid accounts for 0.5% of the total weight of the iron powder. Use the sol-gel method to insulate and coat the passivated magnetic powder, dissolve 6g of aluminum isopropoxide in 40g of absolute ethanol, drop nitric acid to adjust the pH value of the solution to 6, stir evenly for 50min to obtain a sol, take 10mL of the sol and add it to the passivation In the melted magnetic powder, mix and stir for 10 minutes to obtain a suspension. Add 2 mL of deionized water dropwise, and stir in a water bath at 50°C until ...

Embodiment 2

[0028] Take 20g of sendust powder, in which the magnetic powder with a particle size of -200~+300 mesh accounts for 50% of the total mass, the magnetic powder with a particle size of -300~+400 mesh accounts for 40% of the total mass, and the magnetic powder above 400 mesh accounts for 10% of the total mass. The proportioned sendust aluminum powder is passivated by chromic acid, stirred and dried in a water bath at 50° C. to obtain passivated magnetic powder, and the mass of chromic acid accounts for 0.8% of the total weight of the magnetic powder. Use the sol-gel method to insulate and coat the passivated magnetic powder, dissolve 4g of aluminum isopropoxide in 30g of absolute ethanol, drop nitric acid to adjust the pH value of the solution to 4, stir evenly for 30min to obtain a sol, take 25mL of the sol and add it to the passivation In the melted magnetic powder, after mixing and stirring for 20 min to obtain a suspension, 4 mL of deionized water was added dropwise, and stirr...

Embodiment 3

[0036]Take 10g of iron-nickel powder, wherein the magnetic powder with particle size of -200~+300 mesh accounts for 70% of the total mass, the magnetic powder of -300~+400 mesh accounts for 25% of the total mass, and the magnetic powder above 400 mesh accounts for 5% of the total mass. Passivate the proportioned iron-nickel powder with phosphoric acid, stir and dry it in a water bath at 80° C. to obtain passivated magnetic powder, and the mass of phosphoric acid accounts for 1.0% of the total weight of the magnetic powder. Use the sol-gel method to insulate and coat the passivated magnetic powder, dissolve 3g of aluminum isopropoxide in 25g of absolute ethanol, drop in nitric acid to adjust the pH value of the solution to 5, stir evenly for 20min to obtain a sol, take 15mL of the sol and add it to the passivation In the melted magnetic powder, mix and stir for 15 minutes to obtain a suspension. Add 3 mL of deionized water dropwise, and stir in a water bath at 60°C until comple...

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Abstract

The invention discloses a double-shell insulation coating method of a metal soft magnetic composite material, wherein an inorganic salt / oxide composite insulation layer is coated on the surface of themetal magnetic powder through a sol-gel process. As that inorganic salt in the inn layer is use as a buffer layer, the bonding strength of the insulate layer and the compact density are improved; Outer oxide can effectively hinder the decomposition of inner inorganic salt during high temperature annealing and improve the thermal stability of insulating layer. Soft magnetic composites were obtained by compression molding, high temperature heat treatment and spraying process. The invention adopts the sol-gel method to insulate and coat the metal magnetic powder, and the obtained composite coating layer has good combination with the magnetic powder, high thermal stability, does not need to add an adhesive, reduces the production cost, is both inorganic coating materials, has higher resistivity, and effectively reduces the magnetic core loss of the soft magnetic composite material.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic materials, in particular to a double-shell insulation coating treatment method for metal soft magnetic composite materials. Background technique [0002] Soft magnetic composite material (also known as magnetic powder core) is to uniformly coat a layer of insulating medium on the surface of metal magnetic powder, and then use powder metallurgy process to press the magnetic powder into various shapes. Due to its high magnetic permeability, high saturation flux density and low core loss, it is widely used in electronic power fields such as transformers, sensors, and choke coils. However, in practical applications, the high eddy current loss caused by low resistivity limits its high-frequency application. It is usually necessary to coat the surface of the magnetic powder with an insulating layer with high resistivity and good thermal stability to block eddy currents and reduce the mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/24
CPCH01F1/24H01F41/02
Inventor 刘冬高善民王峰
Owner SHANDONG UNIV OF TECH
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