A high thermal stability insulation coating treatment method for metal soft magnetic composite materials

A technology with high thermal stability and composite materials, which is applied in the direction of magnetic properties of inorganic materials, can solve problems such as poor thermal stability and uneven insulating coating, and achieve excellent coating effect, controllable coating thickness and easy operation. Effect

Active Publication Date: 2016-04-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of poor thermal stability and uneven insulating coating layer of current soft magnetic composite materials, the present invention provides a high thermal stability insulation coating treatment method for metal soft magnetic composite materials, using sol-gel method to treat metal soft magnetic materials. Composite material surface coated with Al with high thermal stability 2 o 3 layer, 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

[0025] Sieve 15g iron powder for particle size ratio, dissolve aluminum sec-butoxide with 8% ethanol weight in 100mL ethanol, add acetylacetone with 1% ethanol weight, add nitric acid to adjust pH to 4, stir for 120min to obtain a mixed solution; take 10mL Add the mixed solution into the metal magnetic powder, and stir for 5 minutes at the same time to obtain a suspension; then prepare the mixed solution according to the volume ratio of deionized water and ethanol 1:5, add the mixed solution dropwise to the suspension, heat and stir for 60 minutes, until the liquid is completely Evaporate to dryness to obtain the coated magnetic powder; then place the coated magnetic powder in an environment of 80oC and dry for 15h; then place the coated magnetic powder in a tube furnace with an inert gas atmosphere and heat it at 500oC for 5h; The coated magnetic powder is added with a binder accounting for 0.5% of the coated magnetic powder mass, and is fully stirred under heating conditions ...

Embodiment 2

[0033]Sieve 10g of sendust magnetic powder for particle size ratio, dissolve aluminum sec-butoxide with 5% ethanol weight in 120mL ethanol, add acetylacetone with 1.5% ethanol weight, add nitric acid to adjust the pH to 3, and stir for 60 minutes to obtain a mixed solution; Take 5mL of the mixed solution and add it to the metal magnetic powder, and stir for 8 minutes at the same time to obtain a suspension; then prepare the mixed solution according to the volume ratio of deionized water and ethanol 1:7, add the mixed solution dropwise to the suspension, heat and stir for 30 minutes, until The liquid was completely evaporated to dryness to obtain the coated magnetic powder; then the coated magnetic powder was dried in an environment of 50oC for 20h; then the coated magnetic powder was placed in a tube furnace with an inert gas atmosphere and heated at 550oC for 7h; Add a binder that accounts for 1.5% of the mass of the coated magnetic powder to the coated magnetic powder, and fu...

Embodiment 3

[0041] Sieve 20g of iron-nickel magnetic powder (the mass percentage of iron and nickel is 50% each) for particle size ratio, dissolve aluminum sec-butoxide with 10% ethanol weight in 150mL ethanol, add acetylacetone with 2% ethanol weight, add nitric acid Adjust the pH to 5, stir for 180 minutes to obtain a mixed solution; take 20 mL of the mixed solution and add it to the metal magnetic powder, and stir for 10 minutes at the same time to obtain a suspension; then prepare the mixed solution according to the volume ratio of deionized water and ethanol 1:10, and mix the mixed solution drop by drop Add it into the suspension, heat and stir for 90 minutes until the liquid is completely evaporated to dryness, and then obtain the coated magnetic powder; then place the coated magnetic powder in an environment of 100oC to dry for 10 hours; then place the coated magnetic powder in an inert gas atmosphere Heating in a tube furnace at 600oC for 10 hours; adding a binder accounting for 2....

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Abstract

The invention discloses a high-thermal-stability 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. Composite powder prepared by using the sol-gel method is coated uniformly and densely, and a coating layer is controllable in thickness, and high thermal stability, high resistivity, high saturation magnetization intensity, an excellent magnetic property and an excellent mechanical property are achieved; the surface of the metal magnetic powder is uniformly coated with an Al2O3 insulated layer by using the sol-gel method, so that the coating effect is superior to that of an existing method; the method is high in operability and facilitates batch production; 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 thermal stability insulation coating treatment method for metal soft magnetic composite materials. Background technique [0002] The metal soft magnetic composite material is a soft magnetic material formed by uniformly pressing ferromagnetic particles coated with an insulating medium. Due to the small particle size of the magnetic powder, there is basically no skin effect, and the change of magnetic permeability with frequency is relatively stable. At the same time, metal soft magnetic composite materials also have the characteristics of high saturation magnetic induction, good frequency characteristics and constant magnetic permeability, which make soft magnetic composite materials widely used in radar, electronic communication and Power switch and other fields. [0003] Metal soft magnetic materials have high eddy current losses at high frequ...

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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