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Metal soft magnetic powder core preparation method based on organic/inorganic composite insulation process

An inorganic composite and metal soft magnetic technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as high hysteresis loss, high eddy current loss, and poor DC bias performance, and achieve non-phase Capacitance problems, improve the connection strength, reduce the effect of hysteresis loss

Active Publication Date: 2019-09-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a metal soft magnetic powder core preparation method based on an organic / inorganic composite insulation process, which solves the problems of aging, low magnetic permeability and high hysteresis loss faced by a single organic insulation process, and the problems faced by a single inorganic insulation process. The problems of uneven coating, easy falling off of the insulating layer, high eddy current loss, poor DC bias performance, and the incompatibility of organic insulating materials and inorganic insulating materials and partial agglomeration of inorganic insulating materials faced by the organic / inorganic composite insulation process

Method used

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  • Metal soft magnetic powder core preparation method based on organic/inorganic composite insulation process
  • Metal soft magnetic powder core preparation method based on organic/inorganic composite insulation process
  • Metal soft magnetic powder core preparation method based on organic/inorganic composite insulation process

Examples

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Embodiment 1

[0030] (1) Add 300g of sendust magnetic powder into a solution of 0.6g of epoxy resin diluted with 40g of acetone for ultrasonic dispersion, and then dry at 60°C for 30 minutes to obtain sendust magnetic powder coated with organic insulation;

[0031] (2) Mix 15g of absolute ethanol, 3g of deionized water, 15g of tetraethyl orthosilicate, and 1.5g of kH550 silane coupling agent to prepare an inorganic insulating coating agent;

[0032] (3) Mix the organic insulating coated sendust magnetic powder obtained in step (1) with the inorganic insulating coating agent obtained in step (2), stir mechanically to make a mixed solution, take 0.25g of ammonia water and dilute with 3g of deionized water Finally, add it into the mixed solution at a dropping rate of 0.5ml / min, and stir at the same time. After the dropwise addition is completed, continue stirring for 1 hour, so that the reaction of hydrolyzing ethyl orthosilicate to generate nano-silicon oxide is fully carried out, and the kH55...

Embodiment 2

[0041] (1) Add 300g of iron-silicon magnetic powder into a solution of 0.3g of epoxy resin diluted with 40g of acetone and ultrasonically disperse, and then dry at 60°C for 30 minutes to obtain organic insulating-coated iron-silicon magnetic powder;

[0042] (2) 15g of absolute ethanol, 3g of deionized water, 9g of tetraethyl orthosilicate, and 1.5g of kH550 silane coupling agent are mixed to prepare an inorganic insulating coating agent;

[0043] (3) Mix the ferrosilicon magnetic powder obtained in step (1) after organic insulation coating with the inorganic insulation coating agent obtained in step (2), stir it mechanically to make a mixed solution, take 0.25g of ammonia water and dilute it with 3g of deionized water , add it into the mixed solution at a dropping rate of 0.5ml / min, and stir at the same time. After the dropping is completed, continue to stir for 1h, so that the reaction of hydrolyzing ethyl orthosilicate to generate nano-silicon oxide is fully carried out, and...

Embodiment 3

[0052] (1) Add 300 g of iron-nickel magnetic powder to a solution of 0.9 g of epoxy resin diluted with 40 g of acetone for ultrasonic dispersion, and then dry at 60° C. for 30 minutes to obtain organic insulating-coated iron-nickel magnetic powder;

[0053] (2) Mix 15g of absolute ethanol, 3g of deionized water, 3g of tetraethyl orthosilicate, and 1.5g of kH550 silane coupling agent to prepare an inorganic insulating coating agent;

[0054] (3) After mixing the organic insulating coated iron-nickel magnetic powder obtained in step (1) with the inorganic insulating coating agent obtained in step (2), stir mechanically to make a mixed solution, take 0.25g of ammonia water and dilute it with 3g of deionized water , add it into the mixed solution at a dropping rate of 0.5ml / min, and stir at the same time. After the dropping is completed, continue to stir for 1h, so that the reaction of hydrolyzing ethyl orthosilicate to generate nano-silicon oxide is fully carried out, and the amin...

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Abstract

The invention provides a metal soft magnetic powder core preparation method based on an organic / inorganic composite insulation process. According to the invention, the method comprises steps of firstly, using epoxy resin to carry out organic insulation coating on metal magnetic powder; then carrying out modified coupling on nano silicon oxide powder generated by hydrolyzing the epoxy resin and tetraethoxysilane by using a silane coupling agent, thereby achieving composite insulation of the epoxy resin and the silicon oxide on metal magnetic powder; carrying out cold press molding on the insulated powder on the basis; and carrying out high-temperature annealing on the green body so as to obtain the metal soft magnetic powder core with the excellent direct-current bias performance and low high-frequency loss. According to the invention, problems of aging, low magnetic conductivity and high magnetic hysteresis loss of a single organic insulation process are solved; the problems of non-uniform coating, easy falling of an insulating layer, high eddy current loss and poor direct current bias performance of a single inorganic insulating process are solved; and the problems of incompatibility of an organic insulating material and an inorganic insulating material and local agglomeration of the inorganic insulating material of an organic / inorganic composite insulating process are solved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a metal soft magnetic powder core based on an organic / inorganic composite insulation process. Background technique [0002] Metal soft magnetic powder cores are widely used in inverters, electric vehicles, Inverter air conditioner, communication power supply and other fields. [0003] The magnetic powder particles of the metal soft magnetic powder core are prepared, and the isolation between the magnetic powders is realized through insulation treatment, so as to reduce the eddy current loss and increase the demagnetization field, and greatly improve its application frequency range and anti-saturation ability. Therefore, high-quality magnetic powder Insulation coating treatment is the key to the preparation of high-performance metal soft magnetic powder cores. [0004] At present, the traditional insulation coating process mainly includes two ki...

Claims

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Application Information

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IPC IPC(8): H01F41/02
CPCH01F41/0246
Inventor 苏海林关婉婉徐涛涛吴晓雨邹中秋都有为
Owner HEFEI UNIV OF TECH
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