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A kind of high insulation insulation coating treatment method of metal soft magnetic composite material

A composite material and metal soft magnetic technology, which is applied in the direction of inorganic material magnetism, can solve the problems of uneven coating and poor insulation, and achieve the effect of uniform coating, good oxidation resistance and convenient mass production

Active Publication Date: 2015-12-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of poor insulation and uneven coating layer of metal soft magnetic composite materials at present, the invention provides a high insulation insulation coating treatment method of metal soft magnetic composite materials, which adopts sol-gel method to compound metal soft magnetic materials The surface of the material is coated with a highly insulating MgO layer, and the technical scheme of the present invention is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve magnesium diethanol with 5% ethanol weight in 100ml ethanol, add deionized water with 5% ethanol volume, and stir at room temperature for 10 minutes to obtain a mixed solution; subsequently, add ammonium hydroxide with 1.0% ethanol weight as a hydrolysis catalyst; mix The solution was heated at 50oC under reflux until a gel was formed; after sieving 10g of pure iron powder for particle size ratio, the iron powder was mixed with 1.0wt% of the iron powder by weight until the solvent evaporated completely; The coated magnetic powder is dried in an environment of 50oC for 20h; then the coated magnetic powder is placed in a tube furnace with an inert gas atmosphere and heated at 500oC for 10h; % binder, fully stirred under heating conditions until the mixture is dry and uniformly mixed, the binder is epoxy resin; add a release agent accounting for 0.5% of the total weight of the coated magnetic powder to the coated magnetic powder and mix uniform, the release agent ...

Embodiment 2

[0032] Dissolve magnesium diethanol with 8% ethanol weight in 120ml ethanol, add deionized water with 7% ethanol volume, and stir at room temperature for 20min to obtain a mixed solution; subsequently, add ammonium hydroxide with 2.0% ethanol weight as a hydrolysis catalyst; mix The solution was heated at 80oC under reflux until a gel was formed; after sieving 15g of sendust magnetic powder for particle size ratio, the magnetic powder was mixed with 2.5% of the magnetic powder’s weight gel until the solvent evaporated completely; then the coated The magnetic powder was dried at 70oC for 15 hours; then the coated magnetic powder was heated in a tube furnace with an inert gas atmosphere at 600oC for 8 hours; 1.5% of the mass of the coated magnetic powder was added to the coated magnetic powder Binder, fully stirred under heating conditions until the mixture is dry and uniformly mixed, the binder is phenolic resin; add a release agent accounting for 1.0% of the total weight of the...

Embodiment 3

[0040] Dissolve magnesium diethanol with 10% ethanol weight in 150ml ethanol, add deionized water with 10% ethanol volume, and stir at room temperature for 30min to obtain a mixed solution; subsequently, add ammonium hydroxide with 3% ethanol weight as a hydrolysis catalyst; mix The solution is heated at 100oC under reflux until a gel is formed; 20g of iron-nickel magnetic powder (50% by mass of iron and nickel) is sieved for particle size ratio, and the magnetic powder is mixed with 5.0% of the weight of the magnetic powder. until the solvent evaporates completely; then place the coated magnetic powder in an environment of 100oC and dry for 10h; then place the coated magnetic powder in a tube furnace with an inert gas atmosphere and heat it at 700oC for 5h; Add a binder accounting for 2.5% of the mass of the coated magnetic powder, and stir fully under heating until the mixture is dry and mixed evenly. The binder is silicone resin; add 2.5% of the total weight of the coated ma...

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Abstract

The invention discloses a high-insulativity 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 on the magnetic ring in protective atmosphere for 0.5-2 h, and then performing air cooling and spraying to obtain a target product. According to the high-insulativity insulated coating treatment method of the metal soft magnetic composite material, provided by the invention, a conventional insulated coating process has the universal defects of poor insulativity, non-uniformity in coating and the like. An insulated layer is uniform in coating, and high insulativity and high frequency stability are achieved by adopting the sol-gel method for coating. A MgO insulated layer has extremely high resistivity, the resistivity of the soft magnetic composite material can be greatly improved by coating the surface of magnetic powder with the MgO insulated layer, and the higher magnetic conductivity and lower magnetic core loss are achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic materials, in particular to a high-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 particles and insulating medium. In the high-frequency field, the total loss of soft magnetic composite materials is mainly caused by eddy current loss. The eddy current loss will reduce the magnetic properties of soft magnetic composite materials and generate a lot of Joule heat at the same time. In order to reduce the core loss caused by eddy currents, it is necessary to coat a layer of insulating material with high resistivity on the surface of ferromagnetic particles. Through this layer of uniform insulating coating film, the resistivity of the soft magnetic composite material is improved, thereby reducing the eddy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02H01F1/24
Inventor 严密刘冬吴琛
Owner ZHEJIANG UNIV
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