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Preparation method of ultra-low iron loss sendust core

A technology of sendust and ultra-low iron, which is applied in the field of preparation of ultra-low iron loss sendust cores, can solve the problems of limited reduction, achieve uniform structure, minimize eddy current loss, and high-frequency magnetic permeability Effect

Active Publication Date: 2019-09-03
QINGDAO YUNLU ADVANCED MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN106783126A provides a low-loss iron-silicon powder, which does not add aluminum; CN104575913A provides a preparation method for low-loss amorphous magnetic powder cores, but it is aimed at amorphous magnetic powder cores; CN104361968A discloses a low-loss Although the preparation method of the high permeability sendust magnetic powder core reduces the loss of the sendust magnetic core, the degree of reduction is limited, and it cannot ensure good DC bias performance while reducing the iron loss

Method used

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  • Preparation method of ultra-low iron loss sendust core
  • Preparation method of ultra-low iron loss sendust core

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preparation example Construction

[0024] Embodiments of the present invention provide a method for preparing an ultra-low iron loss sendust core on the one hand, including:

[0025] Gas-atomized powder spraying to obtain gas-atomized Fe-Si-Al powder, pass the gas-atomized Fe-Si-Al powder through a 200-mesh sieve, take the powder under the sieve for insulation coating treatment, and then press and form to obtain a magnetic core, and anneal the magnetic core Finally, spray the insulating treatment agent on the surface of the magnetic core;

[0026] Wherein, the insulating coating treatment includes: pouring the water glass solution into the powder under the sieve and stirring until dry; adding mica powder and stirring evenly, then adding modified silicone resin and stirring evenly, and finally adding zinc stearate.

[0027] In this example, the gas atomized sendust powder obtained by gas atomization powder spraying is used. After sieving, the powder under the sieve has obtained a suitable magnetic permeability t...

Embodiment 1

[0041]Gas atomized powder spraying to obtain gas atomized iron silicon aluminum powder (Al: 5.4%, Si: 9.6%, the rest is iron), pass the gas atomized iron silicon aluminum powder through a 200-mesh sieve, and take the powder under the sieve for insulation coating deal with;

[0042] Then the pressure is 20t / cm 2 , pressed into a magnetic core with an outer diameter of 27mm;

[0043] The magnetic core is annealed at 750°C for 30 minutes and protected by an atmosphere of liquid nitrogen.

[0044] After the annealing treatment, spray the insulating treatment agent epoxy resin on the surface of the magnetic core;

[0045] Wherein, the insulating coating treatment comprises: the water glass solution obtained by dissolving 2wt% water glass of the mass of the under-sieve powder in water is poured into the under-sieve powder, and stirred until dry; adding 0.5 wt% mica powder of the mass of the under-sieve powder Stir evenly, then add 1wt% modified silicone resin of the mass of the p...

Embodiment 2

[0047] Gas atomized powder spraying to obtain gas atomized iron silicon aluminum powder (Al: 5.4%, Si: 9.6%, the rest is iron), pass the gas atomized iron silicon aluminum powder through a 200-mesh sieve, and take the powder under the sieve for insulation coating deal with;

[0048] Then the pressure is 20t / cm 2 , pressed into a magnetic core with an outer diameter of 27mm;

[0049] The magnetic core is annealed at 750°C for 30 minutes and protected by an atmosphere of liquid nitrogen.

[0050] After the annealing treatment, spray the insulating treatment agent epoxy resin on the surface of the magnetic core;

[0051] Wherein, the insulating coating treatment comprises: the water glass solution obtained by dissolving 1wt% water glass of the mass of the powder under the sieve in water is poured into the powder under the sieve, stirred until dry; adding 0.2 wt% mica powder of the mass of the under-sieve powder Stir evenly, then add 0.5wt% modified silicone resin of the powder...

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Abstract

The invention provides a method for preparing an ultra-low iron loss sendust magnetic core, which belongs to the field of magnetic materials. The sendust magnetic core prepared from the atomized sendust powder can stabilize the structural basis of sendust Effectively reduce iron loss and improve DC bias capability. The preparation method of the ultra-low iron loss sendust magnetic core comprises: gas atomization powder spraying to obtain gas atomized sendust powder, passing the gas atomized sendust powder through a 200-mesh sieve, and taking the powder under the sieve for insulation coating treatment, and then press molding to obtain a magnetic core, after the annealing treatment of the magnetic core, the surface of the magnetic core is sprayed with an insulating treatment agent; wherein, the insulating coating treatment includes: pouring the water glass solution into the powder under the sieve, and stirring until dry; Add mica powder and stir evenly, then add modified silicone resin, stir evenly, and finally add zinc stearate.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for preparing an ultra-low iron loss sendust magnetic core. Background technique [0002] At present, the preparation of sendust has the form of crushed sendust and aerosolized sendust, among which the sendust powder prepared by gas atomization method has a greatly improved DC bias ability compared with crushed sendust, in view of The unique excellent structural characteristics of sendust, the magnetostriction coefficient λs and the magnetic anisotropy constant K are both zero, sendust powder is being widely used in the market. In view of this, further improving the performance of atomized sendust powder is the main research direction of various manufacturers, which will help to improve product competitiveness and better increase market share. [0003] Since the properties of various atomized sendus appearing on the market vary greatly, the excellent performance of ato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/24H01F41/02B22F1/02C21D1/26
CPCH01F1/14791H01F1/24H01F41/0246C21D1/26B22F1/16
Inventor 纪杰江志滨庞靖
Owner QINGDAO YUNLU ADVANCED MATERIALS TECH CO LTD
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