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Preparation method of low-loss soft magnetic composite material

A soft magnetic composite material, low-loss technology, applied in the fields of inorganic material magnetism, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of low level, difficult hysteresis loss and eddy current loss, etc., to reduce hysteresis loss , The effect of reducing eddy current loss and high compression density

Active Publication Date: 2021-10-22
安徽瑞德磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the cumbersome magnetic powder particle size ratio and solve the problem that it is difficult to keep hysteresis loss and eddy current loss at a low level during composite insulation, the present invention provides a A kind of preparation method of low loss soft magnetic composite material

Method used

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  • Preparation method of low-loss soft magnetic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Select 60g of magnesium chloride, 60g of aluminum chloride, and 600g of iron-silicon magnetic powder (mass ratio is 1:1:10). The particle size of the iron-silicon magnetic powder is 20-180μm, and then add 300g of 98% ethanol solution, After mixing, stir evenly to obtain a mixed solution.

[0032] (2) Add 51g of ammonia water to the mixed solution, the amount of ammonia water added is 5% of the mass of the mixed solution, fully react, dry at a temperature of 80°C, and pass through a 80-mesh sieve to obtain a composite powder.

[0033] (3) Put the obtained composite powder into a tube furnace, first raise the temperature to 600°C under a protective atmosphere of nitrogen, and keep it for 60 minutes;

[0034] (4) Preparation of low-loss soft magnetic composite materials

[0035] (4.1) Pass the heat-treated powder through a 80-mesh sieve, and carry out two-way floating pressing under a pressure of 2100MPa in a hydraulic press to obtain a green body of soft magnetic com...

Embodiment 2

[0039] The preparation operation steps of a kind of low-loss soft magnetic composite material are as follows:

[0040] (1) Select 30g of magnesium chloride, 30g of aluminum chloride, and 600g of gas-atomized sendust magnetic powder (mass ratio: 1:1:20), in which the particle size of the gas-atomized sendust magnetic powder is 20-180μm, and then add 300g of 98% ethanol solution was mixed and stirred evenly to obtain a mixed solution.

[0041] (2) Add 28.8g of ammonia water to the mixed solution, the amount of ammonia water added is 3% of the mass of the mixed solution, fully react, dry at 90°C, and pass through a 80-mesh sieve to obtain a composite powder.

[0042] (3) Put the composite powder into a tube furnace, first raise the temperature to 500°C under a protective atmosphere of nitrogen, and keep it for 120 minutes; then raise the temperature to 900°C, keep it for 120 minutes, and cool with the furnace to obtain heat-treated powder. see figure 1 (b), a uniform and dense ...

Embodiment 3

[0048] The preparation operation steps of a kind of low-loss soft magnetic composite material are as follows:

[0049] (1) Select 20g of magnesium chloride, 20g of aluminum chloride, and 600g of iron-nickel magnetic powder (mass ratio: 1:1:30). The particle size of the original magnetic powder is 20-180μm, and then add 300g of 98% ethanol solution, mix Then stir evenly to obtain a mixed solution.

[0050] (2) Add 9.4g of ammonia water to the mixed solution, the amount of ammonia water added is 1% of the mass of the mixed solution, fully react, dry at 100°C, and pass through a 80-mesh sieve to obtain a composite powder.

[0051] (3) Put the composite powder into a tube furnace, first raise the temperature to 400°C under a protective atmosphere of nitrogen, and keep it for 180 minutes;

[0052] (4) Preparation of low-loss soft magnetic composite materials

[0053] (4.1) Pass the heat-treated powder through a 80-mesh sieve, and carry out two-way floating pressing under a pressu...

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Abstract

The invention provides a preparation method of a low-loss soft magnetic composite material, and belongs to the technical field of magnetic materials. The preparation method comprises the following steps of: putting metal magnetic powder into a mixed solution of magnesium chloride and aluminum chloride, then adding excessive ammonia water into the mixed solution, and carrying out two-step calcination, pressing and annealing treatment to obtain the magnesium oxide and aluminum oxide composite insulated low-loss soft magnetic composite material. Taking the aerosolized Fe-Si-Al soft magnetic composite material with the relative permeability level of 60 as an example, compared with a magnetic core prepared by a conventional method, the magnetic core prepared by the method has the advantages that the pressing density is improved by 2.8%, and the magnetic hysteresis loss is reduced by 24.6%. The specific resistance of the soft magnetic composite material is improved from 6.224 * 10 < 9 > [mu]omega cm to 8.565 * 10 < 9 > [mu]omega cm, and the eddy current loss at 500 kHz / 50 mT is reduced by 69 mW / cm < 3 >. A magnesium oxide and aluminum oxide composite insulating layer obtained through two-step calcination obviously improves the pressing density and specific resistance of the soft magnetic composite material, and meanwhile reduces the magnetic hysteresis loss and the eddy current loss of the soft magnetic composite material.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a preparation method of a low-loss soft magnetic composite material. Background technique [0002] Soft magnetic composite materials are widely used in photovoltaic inverters, electric vehicles, inverter air conditioners and other fields due to their excellent DC bias performance and good frequency stability. As the switching frequency continues to increase, more attention is paid to the loss of soft magnetic composite materials. How to reduce the loss of soft magnetic composite materials under the premise of ensuring excellent DC bias performance is a current research hotspot. [0003] The study of loss separation found that the application frequency band is below about 100kHz, and the loss of soft magnetic composite materials is mainly hysteresis loss. However, when the application frequency range is increased to hundreds of kHz, the hysteresis loss and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/24
CPCH01F41/02H01F1/24
Inventor 徐涛涛张博玮冯松松张鑫朱玉飞邹中秋仝西川马剑
Owner 安徽瑞德磁电科技有限公司
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