Preparation method of a soft magnetic powder core with μ = 150-250

A magnetic powder core, sendust technology, applied in the field of preparation of high magnetic permeability μ = 150-250 sendust magnetic powder core, can solve the problem of low magnetic permeability of magnetic powder core, achieve low power loss, improve heat treatment Effect of Temperature, High DC Superposition Performance

Active Publication Date: 2020-03-20
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of high magnetic permeability and DC superposition performance in order to solve the defect that the existing magnetic powder core magnetic permeability is low and cannot meet some requirements of high magnetic permeability magnetic core, and the μ=150 of very low power loss Preparation method of ~250 sendust soft magnetic powder core

Method used

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  • Preparation method of a soft magnetic powder core with μ = 150-250
  • Preparation method of a soft magnetic powder core with μ = 150-250
  • Preparation method of a soft magnetic powder core with μ = 150-250

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Effect test

Embodiment 1

[0028] A method for preparing a soft magnetic powder core of sendust with μ=150-250, taking sendust magnetic powder, C: 0.008%, N: 0.01%, O: 0.08%, Si: 9.5%, Al: 5.5%, I The amount is iron, the powder particle size D99=158um, D50=68um, the original powder is annealed at 800°C for 6 hours in a pure nitrogen atmosphere; then add 0.012% phosphoric acid aqueous solution and fry until completely dry; then add 0.1% magnesium hydroxide and 0.1% sodium silicate Mix the aqueous solution and fry until completely dry; add 0.3% high-temperature organic silica gel water acetone solution, dry until completely dry, and finally add 0.3% of the weight of magnetic powder zinc stearate as a release agent, mix well, and press to 20.3mm* 12.7mm*6.35mm magnetic ring, the molding pressure is 18.5t / cm2; the molded magnetic core is heat-treated at 700°C for 50 minutes in a nitrogen atmosphere; after cooling, epoxy resin is sprayed on the surface of the magnetic core, and after curing, μ =246 sendust m...

Embodiment 2

[0030] A method for preparing a soft magnetic powder core of sendust with μ=150-250, taking sendust magnetic powder, C: 0.012%, N: 0.05%, O: 0.2%, Si: 9.0%, Al: 5.1%, and The amount is iron, the powder particle size D99=147um, D50=60um, the original powder is annealed at 700°C for 0.5h in a pure hydrogen atmosphere; then add 0.1% phosphoric acid alcohol solution and fry until completely dry; then add 0.3% kaolin and 0.2% Mica powder mixed aqueous solution, fry until completely dry; add mass fraction of 0.5% high-temperature organic silica gel aqueous toluene solution, dry until completely dry, finally add 0.5% of the weight of magnetic powder aluminum stearate as a release agent, after mixing evenly, Press it into a magnetic ring of 20.3mm*12.7mm*6.35mm, and the molding pressure is 20.5t / cm2; heat-treat the molded magnetic core at 850°C for 30 minutes in a nitrogen atmosphere; spray epoxy resin on the surface of the magnetic core after cooling , After solidification, μ=203 sen...

Embodiment 3

[0032] A method for preparing a soft magnetic powder core of sendust with μ=150-250, taking sendust magnetic powder, C: 0.03%, N: 0.2%, O: 0.05%, Si: 7.5%, A1: 8.5%, and The amount is iron, powder particle size D99=145um, D50=63um, the original powder is annealed at 900°C for 0.5h in a pure argon atmosphere; then add 0.5% phosphate acetone solution and fry until completely dry; then add 0.2% aluminum hydroxide by mass fraction , 0.2% potassium silicate mixed aqueous solution, fry until completely dry; add 0.8% mass fraction of high-temperature organic silica gel water acetone solution, dry until completely dry, and finally add 0.1% molybdenum disulfide by weight of the magnetic powder as a release agent, mix After uniformity, press it into a magnetic ring of 20.3mm*12.7mm*6.35mm, and the molding pressure is 16t / cm2; heat-treat the molded magnetic core at 600°C for 120min in an argon atmosphere; spray on the surface of the magnetic core after cooling Epoxy resin, after curing, ...

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Abstract

The present invention utilizes FeSiAl magnetic powder to realize the preparation of high-permeability FeSiAl soft magnetic powder core through powder particle size ratio, powder, magnetic core annealing treatment, insulation coating and other processes. The magnetic permeability μe of the sendust soft magnetic powder core prepared by this method is 150-250 (10kHz-1MHz), and the power loss of the magnetic powder core is 500-800kW / m at 25°C 3 Below (test condition: 100kHz / 100mT), reaching the international leading level.

Description

technical field [0001] The invention relates to the technical field of soft magnetic materials, and relates to a method for preparing a high magnetic permeability μ=150-250 iron-silicon-aluminum alloy magnetic powder core used in filter inductors. Background technique [0002] Metal soft magnetic powder cores have the advantages of high saturation magnetic induction, high Curie temperature and high DC-bias, and are widely used in switching power supplies with a frequency of 10kHz-200kHz for filter inductors. The sendust magnetic powder core has the advantages of high frequency, low loss, low magnetostriction coefficient (low noise), etc. The crushed sendust has low cost and has a large market capacity. However, the highest magnetic permeability of sendust magnetic powder cores that can be mass-produced is only 125, and the magnetic permeability of some literature patents is only less than 150. At present, only iron-nickel and iron-nickel-molybdenum materials can be used to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/06C22C33/02B22F1/00B22F3/02B22F3/24H01F1/147H01F1/22H01F3/08H01F41/02
CPCH01F1/14791H01F1/22H01F3/08H01F41/0266C22C33/0278C22C38/001C22C38/002C22C38/004C22C38/02C22C38/06B22F3/02B22F3/24B22F2003/248B22F1/142B22F1/145
Inventor 姚骋熊伟申建伟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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