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Multilayer-coated soft magnetic composite material and preparation method thereof

A soft magnetic composite material and multi-layer coating technology, which is applied in the direction of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of reducing the magnetic properties of composite materials and large eddy current losses, and achieve the improvement of heat treatment temperature , The effect of low eddy current loss

Active Publication Date: 2019-05-14
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic materials mainly include Al 2 o 3 , MgO, SiO 2 etc., they have high resistivity, can effectively reduce magnetic loss, have high thermal stability, and can withstand high temperatures, but they are non-magnetic materials, which will reduce the magnetic properties of the composite material itself, such as Ms , Bs, etc.
In order to ensure that SMCs have good magnetic properties, ferrites with large resistivity have entered the sight of researchers, and Mn-Zn ferrites, Ni-Zn ferrites, etc. have been used as coating materials. However, it is difficult for ferrite to be evenly coated on the surface of magnetic powder, so it will cause a large eddy current loss

Method used

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  • Multilayer-coated soft magnetic composite material and preparation method thereof
  • Multilayer-coated soft magnetic composite material and preparation method thereof
  • Multilayer-coated soft magnetic composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0060] A method for preparing a multilayer coated soft magnetic composite material, comprising the following steps:

[0061] (1) take by weighing the Fe powder of 50g, put into beaker;

[0062] (2) Measure 0.7ml of phosphoric acid and 99.3ml of alcohol respectively, and slowly add the passivating agent into the alcohol to make a passivating solution of 0.012g / ml;

[0063] (3) Measure 15ml of the phosphoric acid passivation solution, add it into a beaker, put it into a constant temperature water bath at 65°C, stir until the solution is completely evaporated to dryness, and obtain powder A;

[0064] The Al 2 o 3 The preparation of colloid comprises the steps:

[0065] (4) Take by weighing 4.0048g aluminum isopropoxide (grinding), put into beaker A after weighing;

[0066] (5) Measure 50ml of ethylene glycol ether in a graduated cylinder, add it to beaker A, and stir magnetically at 60°C for 30 minutes;

[0067] (6) Weigh 2.0024g of acetylacetone, slowly add it into beaker A...

Embodiment 2

[0079] A method for preparing a multilayer coated soft magnetic composite material, comprising the following steps:

[0080] (1) take by weighing the Fe powder of 50g, put into beaker;

[0081] (2) Measure 0.7ml of nitric acid and 99.3ml of alcohol respectively, and slowly add the passivating agent into the alcohol to make a passivating solution of 0.012g / ml;

[0082] (3) Measure 15ml of nitric acid passivation solution, add it into a beaker, put it into a constant temperature water bath at 65°C, stir until the solution is completely evaporated to dryness, and obtain powder A;

[0083] The Al 2 o 3 The preparation of colloid comprises the steps:

[0084] (4) Take by weighing 4.0048g aluminum isopropoxide (grinding), put into beaker A after weighing;

[0085] (5) Measure 50ml of ethylene glycol ether in a graduated cylinder, add it to beaker A, and stir magnetically at 60°C for 30 minutes;

[0086] (6) Weigh 2.0024g of acetylacetone, slowly add it into beaker A, and stir m...

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Abstract

The invention relates to a multilayer-coated soft magnetic composite material and a preparation method thereof. The composite material is of a core-shell structure, iron-based alloy powder is taken asa core, and a passivation layer and an Al2O3 coating layer are sequentially coated on the surface of the iron-based alloy powder. The preparation method comprises the following steps: performing reaction on the iron-based alloy powder in passivation solution, so that powder A is obtained; preparing Al2O3 colloid; performing ball-milling reaction on the powder A and the Al2O3 colloid; and performing high temperature calcining on the powder subjected to ball milling, so that a multilayer-coated soft magnetic composite material with high magnetic permeability and low loss is obtained. Compared with the prior art, the multilayer-coated soft magnetic composite material provided by the invention has the advantages that high-resistivity insulating substances are coated for multiple layers, so that magnetic loss of the composite material is relatively low under high frequency application condition, and an insulated coating layer which is better in uniformity and has the thickness capable of being accurately controlled can be obtained; and Al2O3 sol-gel has strong heat stability, density of magnetic powder can be improved to the utmost extent, and magnetic permeability of the magnetic powder is improved.

Description

technical field [0001] The invention relates to a soft magnetic composite material in the field of functional materials, in particular to a multi-layer coated soft magnetic composite material and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, people put forward the development requirements of miniaturization, intelligence, high integration, high energy and high power input for various electronic components. As one of the core materials of electromagnetic conversion equipment, SMCs will definitely develop towards high Bs, high Ms, high Tc, low Pc, low Hc, high frequency, miniaturization, and thinning. Iron-based soft magnetic composite material is a metal soft magnetic composite material with high cost performance, which has broad application space in the fields of power factor correction circuit, pulse flyback transformer, energy storage filter inductor and line filter. But with the increase of it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/00H01F41/02
Inventor 陆伟钱立伟向震潘益帆罗振益
Owner TONGJI UNIV
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