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High-bonding-strength insulated coating treatment method of metal soft magnetic composite material

A composite material, metal soft magnetic technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of low bonding strength of insulating coating layer, poor thermal stability, uneven coating, etc., to achieve excellent magnetic properties and mechanical properties, coating The effect of low processing temperature and strong operability

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects of low bonding strength, uneven coating and poor thermal stability of the insulating coating layer of the current soft magnetic composite material, the present invention provides a high bonding strength insulating coating treatment method of the metal soft magnetic composite material, using sol-gel Coating of TiO with high bonding strength on metal soft magnetic composites by glue method 2 Insulating layer, technical scheme of the present invention is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 5mL tetrabutyl titanate (TBT) and add it to 100mL ethanol, stir at room temperature for 30min to obtain a precursor solution; take 5mL distilled water, 10mL glacial acetic acid and 20mL ethanol and mix with each other, add dropwise to the precursor solution while stirring Medium; then continue to stir for 1h to obtain yellow transparent TiO 2 Sol; the solution is placed in an environment of 80oC under reflux until a gel is formed; after sieving 20g of pure iron powder for particle size ratio, mix the iron powder with 2.5% of the iron powder’s weight gel, and stir until the solvent evaporates Completely, the coated magnetic powder is obtained; then the coated magnetic powder is dried in an environment of 70oC for 15h; A binder accounting for 0.5% of the mass of the coated magnetic powder is fully stirred under heating conditions until the mixture is dry and uniformly mixed. The binder is epoxy resin; 0.5% mold release agent and mix evenly, and described mold releas...

Embodiment 2

[0031] Take 10mL tetrabutyl titanate (TBT) and add it to 120mL ethanol, stir at room temperature for 90min to get the precursor solution; take 5mL distilled water, 10mL glacial acetic acid and 35mL ethanol and mix with each other, add dropwise to the precursor solution while stirring in; then continue to stir for 90min to obtain yellow transparent TiO 2Sol; the solution is placed in an environment of 50oC under reflux until a gel is formed; after sieving 15g sendust magnetic powder for particle size ratio, mix the magnetic powder with 1.0% of the weight of the magnetic powder gel, and stir until the solvent evaporates completely , to obtain the coated magnetic powder; then place the coated magnetic powder in a 50oC environment to dry for 20h; then place the magnetic powder in a tube furnace with an inert gas atmosphere and heat it at 500oC for 7h; A binder of 1.5% of the mass of the coated magnetic powder is fully stirred under heating conditions until the mixture is dry and u...

Embodiment 3

[0039] Take 15mL tetrabutyl titanate (TBT) and add it to 150mL ethanol, stir at room temperature for 120min to obtain a precursor solution; take 5mL distilled water, 10mL glacial acetic acid and 30mL ethanol and mix with each other, add dropwise to the precursor solution while stirring middle; then continue to stir for 180min to obtain yellow transparent TiO 2 sol; the solution is placed in an environment of 100oC under reflux until a gel is formed; 10g of iron-nickel magnetic powder (the mass percentages of iron and nickel are 50% each) is sieved for particle size ratio, and the magnetic powder and the weight of the magnetic powder are 5.0 % gel mixed, stirred until the solvent evaporated completely, and the coated magnetic powder was obtained; then the coated magnetic powder was dried in an environment of 100oC for 10h; then the magnetic powder was placed in a tube furnace with an inert gas atmosphere at 700oC Heating for 10 hours; adding a binder accounting for 2.5% of the ...

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Abstract

The invention discloses a high-bonding-strength insulated coating treatment method of a metal soft magnetic composite material. The method comprises the following steps: (1) sieving metal magnetic powder, and performing particle size distribution; (2) performing insulated coating on the distributed metal magnetic powder by using a sol-gel method, and then drying the metal magnetic powder; (3) uniformly mixing the dried magnetic powder and an adhesive, adding a release agent, and performing dry pressing to obtain a magnetic ring; (4) performing heat preservation, air cooling and spraying on the magnetic ring in protective atmosphere to obtain a target product. The bonding strength of composite powder prepared by using the sol-gel method and magnetic powder particles is high, the powder is coated uniformly and densely, and a coating layer is controllable in thickness, good, oxidation resistance and high saturation magnetization intensity are achieved, excellent in magnetic property and mechanical property, high in bonding strength, and not prone to disengagement; the coating effect is superior to that of an existing method; the method is high in operability and facilitates batch production; the resistivity of soft magnetic metal particles is effectively improved, and the magnetic core loss of the soft magnetic composite material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic materials, in particular to a high bonding strength insulation coating treatment method for metal soft magnetic composite materials. Background technique [0002] Metal soft magnetic composite material is a kind of soft magnetic material formed by mixing and pressing ferromagnetic powder particles and insulating substances. Metal soft magnetic composite materials not only retain part of the excellent properties of metal soft magnetism and ferrite soft magnetism, but also overcome some defects of the two, and have excellent comprehensive performance. Common preparation processes of soft magnetic composite materials include: powder passivation, insulation coating, compression molding, and heat treatment. Among them, insulation coating is an important link in the preparation process of soft magnetic composite materials. The quality of coating directly affects the frequency characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F1/24
Inventor 吴琛刘冬严密
Owner ZHEJIANG UNIV
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