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Soft magnetic powder compound, magnetic powder core material and insulating coating method based on organic matter growth

A soft magnetic powder, insulating coating technology, applied in the direction of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc. , low uniformity of ferrite coating, etc., to achieve the effect of reducing dilution effect, improving magnetic properties, and good compactness

Pending Publication Date: 2022-02-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Phosphate coating: This type of method was applied earlier, but the resistivity of the phosphate coating material is low, the eddy current loss is large at high frequencies, the stability of the plating solution is poor, and the operation is complicated. At the same time, harmful substances such as phosphoric acid are harmful to the human body. , not suitable for large-scale industrial production and application
[0010] Metal oxide coating: This type of method is currently the mainstream coating method, because it generally has high thermal stability and good electrical insulation ability, which meets the requirements of heat treatment, but it is brittle and insulates during the pressing process. The coating layer is easy to break, resulting in poor coating effect
[0011] Ferrite coating: This type of method can minimize the influence of coating materials on the magnetic properties of the substrate, and can ensure the stability of magnetic properties in the MHz range, so it is widely used, but the uniformity of ferrite coating is low. Low compact density

Method used

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  • Soft magnetic powder compound, magnetic powder core material and insulating coating method based on organic matter growth
  • Soft magnetic powder compound, magnetic powder core material and insulating coating method based on organic matter growth
  • Soft magnetic powder compound, magnetic powder core material and insulating coating method based on organic matter growth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 30g of particle size D 50 Fe-Si-B-C-Cr alloy soft magnetic raw powder of 25 μm is placed in 500mL0.5mol / L NaOH solution for 30min, then taken out and washed with deionized water until the pH value is neutral;

[0073] Put the soft magnetic powder taken out above into 60 mL of polyethyleneimine (molecular weight 1800) solution with a concentration of 50 mg / mL and sonicate for 30 min;

[0074] Dopamine and polyethyleneimine are simultaneously put into 500mL0.05mol / L Tris-HCl solution according to the mass ratio of 2:1, wherein the concentrations of dopamine and polyethyleneimine are 8mg / mL and 4mg / mL respectively, to obtain Tris-HCl / DA+PEI solution, and the above-mentioned soft magnetic powder added to the Tris-HCl / DA+PEI solution after ultrasonic treatment of polyethyleneimine solution;

[0075] The above mixed solution was mechanically stirred for 24 hours while heating at a constant temperature of 40°C, and dried to obtain a soft magnetic powder composite;

[0076] T...

Embodiment 2

[0081] 30g of particle size D 50 Fe-Si-B-C-Cr soft magnetic raw powder of 25 μm was placed in 500 mL of NaOH solution with a concentration of 0.5 mol / L and ultrasonically treated for 30 minutes, then taken out and washed with deionized water until the pH value was neutral;

[0082] Put the soft magnetic powder taken out above into 60 mL of polyethyleneimine (molecular weight 600) solution with a concentration of 50 mg / mL and sonicate for 30 min;

[0083] Dopamine and polyethyleneimine with a mass ratio of 1:1 are simultaneously put into 0.1mol / L Tris-HCl solution, wherein the concentrations of dopamine and polyethyleneimine are both 12 mg / mL to obtain Tris-HCl / DA +PEI solution, and the above-mentioned soft magnetic powder after ultrasonic treatment in polyethyleneimine solution is added to Tris-HCl / DA+PEI solution;

[0084] The above mixed solution was heated at a constant temperature of 25°C while being mechanically stirred for 30 hours and dried to obtain a soft magnetic po...

Embodiment 3

[0090] 30g of particle size D 50 Fe-Si-B-C-Cr soft magnetic raw powder of 25 μm was placed in 500 mL of NaOH solution with a concentration of 0.5 mol / L and ultrasonically treated for 30 minutes, then taken out and washed with deionized water until the pH value was neutral;

[0091] Put the soft magnetic powder taken out above into 60 mL of polyethyleneimine (molecular weight 600) solution with a concentration of 50 mg / mL and sonicate for 30 min;

[0092] Dopamine and polyethyleneimine (molecular weight 600) with a mass ratio of 2:1 were simultaneously put into 0.1mol / L Tris-HCl solution, wherein the concentrations of dopamine and polyethyleneimine were 8mg / mL and 4mg / mL respectively, Obtain Tris-HCl / DA+PEI solution;

[0093] Add the above-mentioned soft magnetic raw powder after ultrasonic treatment in the polyethyleneimine solution to the above-mentioned Tris-HCl / DA+PEI solution, heat at a constant temperature of 60 degrees Celsius, mechanically stir for 8 hours, and dry to ...

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Abstract

The invention discloses a soft magnetic powder compound, a magnetic powder core material and an insulation coating method based on organic matter growth, and belongs to the technical field of soft magnetic materials. The soft magnetic powder compound comprises soft magnetic powder and an insulating coating layer, wherein the insulating coating layer wraps the soft magnetic powder; the material of the insulating coating layer is prepared by cross-linking reaction of dopamine hydrochloride (hereinafter referred to as dopamine) and polyethyleneimine; and the soft magnetic powder is selected from metal and / or alloy materials containing Fe elements. The insulation coating method is low in harmfulness, high stability can be realized in a certain temperature range, the thickness of an insulation film is low and controllable, the film forming uniformity is high, and eddy current among particles can be effectively isolated; meanwhile, the adhesive force of the insulating coating layer is large, the usage amount of an insulating adhesive can be reduced, compression molding is easy, a nonmagnetic phase dilution effect is reduced, and the magnetic performance of a matrix is further improved.

Description

technical field [0001] The application specifically relates to a soft magnetic powder compound, a magnetic powder core material and an insulation coating method based on organic growth, and belongs to the technical field of magnetic powder core preparation. Background technique [0002] The magnetic powder core is a kind of soft magnetic composite material prepared by mixing soft magnetic powder and insulating medium. The compression molding technology of soft magnetic powder and insulating medium largely determines the compactness of the magnetic powder core, the amount and volume fraction of magnetic powder and insulating coating material, the thickness of the insulating coating, the uniformity of the insulating coating, the coating The bonding effect of the coating and the matrix is ​​crucial to the performance of the magnetic powder core such as resistivity, magnetic permeability, coercive force, hysteresis loss, and eddy current loss. [0003] Eddy current loss is the ...

Claims

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Application Information

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IPC IPC(8): H01F1/26H01F41/02
CPCH01F1/26H01F41/02
Inventor 张岩王军强黄妍
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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