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Method for manufacturing [mu]90 composite magnetic powder core

A manufacturing method and technology of magnetic powder core, applied in the direction of magnetic material, magnetic object, inorganic material magnetism, etc., can solve the problem of magnetic powder core unable to balance loss, DC bias characteristics, cost, etc., and achieve good DC superposition characteristics and low eddy current loss. , the effect of low cost

Inactive Publication Date: 2017-11-21
天通(六安)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional magnetic powder cores cannot balance loss, DC bias characteristics, and cost, but their technology is relatively mature, and their reliability and stability have also been verified by time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the mass ratio of mechanical Fe-Si-Al:Fe-Si:Aerosolized Fe-Si-Al=1:2:1, the phosphating solution equivalent to 0.1% of the alloy powder mass is added for passivation treatment. To form a coating film on the surface, add 0.2% silicon oxide powder, 0.1% aluminum oxide (or mica powder), 1.5% sodium silicate, and 4% deionized water to the alloy powder in turn, mix them evenly, dry and sieve, add 0.5% zinc stearate, use 2100MPa (21T / cm 2 ) pressure compression molding, the molded magnetic powder core is kept in a nitrogen or argon environment at 720°C for 60 minutes for stress relief heat treatment, and finally coated with epoxy resin powder on the surface of the magnetic powder core. The physical characteristics and magnetic properties of the obtained magnetic powder core:

[0026] 1. At 100kHz and 1V, the magnetic permeability of the magnetic powder core is μ=88.7;

[0027] 2. DC superposition characteristics: at 100kHz, 25°C, the coefficient of initial perm...

Embodiment 2

[0030] The alloy powder ratio is carried out according to the mass ratio of mechanical sendust: iron silicon: iron nickel = 1:2:1, and the subsequent process steps are carried out according to Example 1; the physical characteristics and magnetic properties of the obtained magnetic powder core:

[0031] 1. At 100kHz, the magnetic permeability of the magnetic powder core is μ=91.5;

[0032] 2. DC superposition characteristics: at 100kHz, 25°C, the coefficient of initial permeability of the magnetic powder core is 0.412 under the magnetic field strength of 100Oe;

[0033] 3. Power loss PCV of magnetic powder core (50kHz, 1000Gs) = 308mW / cm 3 .

Embodiment 3

[0035] The proportion of alloy powder is according to the mass ratio of mechanical FeSiAl:FeSi:FeNiMo=1:2:1, and the subsequent process steps are carried out according to Example 1; the physical characteristics and magnetic properties of the obtained magnetic powder core are as follows:

[0036] 1. At 100kHz, the magnetic permeability of the powder core is μ=58.9;

[0037] 2. DC superposition characteristics: at 100kHz, 25°C, the coefficient of the initial magnetic permeability of the magnetic powder core is 0.374 under the magnetic field strength of 100Oe;

[0038] 3. Power loss P of magnetic powder core CV (50kHz, 1000Gs) = 287mW / cm 3 .

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Abstract

The invention discloses a method for manufacturing a [mu]90 composite magnetic powder core. The [mu]90 composite magnetic powder core is made by compounding two or more alloy powders. The alloy powders comprise the following components: mechanically crushed sendust, aerosolized sendust, aerosolized iron-silicon, aerosolized iron-nickel and aerosolized iron-nickel-molybdenum. The manufacturing method comprises the steps of powder compounding, passivation, insulation coating, press molding, heat treatment and surface coating. The alloy powders complement each other in terms of performance so that the performance of the prepared composite powder core is close to that of a commercially available amorphous magnetic powder core. The alloy powders used in the method have the advantages of mature technology, stable performance and relatively low cost so that the prepared magnetic powder core has quite high cost performance and stable characteristics. The composite magnetic powder core with magnetic permeability of [mu]90 has excellent physical properties and magnetic properties. By use of the magnetic powder core prepared by the invention, the development requirements of an existing electronic industry for low-voltage high current, high power density and high frequency are greatly satisfied.

Description

technical field [0001] The invention relates to the field of soft magnetic materials and powder metallurgy, in particular to a manufacturing method of a magnetic permeability μ90 composite magnetic powder core. This soft magnetic material is not only suitable for making high-current power inductors, PFC circuit inductors, DC / DC converters and Photovoltaic inverters, etc. technical background [0002] With the high frequency, miniaturization, and high power density of power electronic equipment, traditional silicon steel sheets are gradually losing their advantages, and iron-based magnetic powder cores are a relatively reasonable choice for cost performance; among them, amorphous magnetic powder cores are combined with power consumption advantages. It is an ideal material with DC superposition characteristics, but it has not been used in large quantities due to various reasons such as materials, powder core technology, and reliability. [0003] Traditional magnetic powder co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/22B22F1/02
CPCH01F1/147H01F1/22B22F1/16
Inventor 柏海明李磊刘光雨
Owner 天通(六安)新材料有限公司
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