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Magnetically soft alloy material and preparation method, power inductor

A technology of soft magnetic alloys and alloy materials, which is applied in the fields of magnetic materials, parts of transformers/inductors, manufacturing of inductors/transformers/magnets, etc., can solve the problems of device performance deterioration, copper loss increase, magnetic core heating, etc., and achieve reduction Small loss, increased insulation, and reduced eddy current loss

Active Publication Date: 2017-05-24
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When power inductors are used at high frequencies, especially at 100KHz and above, on the one hand, the magnetic core made of the existing soft magnetic alloy will generate more heat, which will cause the performance of the device to deteriorate
On the other hand, for some soft magnetic alloy materials with low loss and low magnetic permeability, in order to make the power inductor have a higher inductance, it is often necessary to increase the number of coils wound on the magnetic core, resulting in copper loss increase, the performance of the device deteriorates

Method used

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  • Magnetically soft alloy material and preparation method, power inductor
  • Magnetically soft alloy material and preparation method, power inductor

Examples

Experimental program
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Effect test

preparation example Construction

[0016] The preparation method of the soft magnetic alloy material of this embodiment includes the following steps:

[0017] S1, mixing the coarse particle powder with the particle size of the Fe-based alloy material of 30 μm or more and the fine particle powder with the particle size of 15 m or less.

[0018] In this step, the Fe-based alloy material can be FeSiCr alloy, FeSiAl alloy, or FeSi alloy. It should be noted that it is necessary to mix the coarse particles and fine particles of the material. After testing, if only coarse particles are used, the loss of the prepared material will be reduced after the subsequent treatment, but the reduction is not obvious, and it is difficult to significantly improve . However, if only fine particles are used, after the subsequent treatment, the loss of the prepared material is greatly reduced, but it will also cause a serious decrease in magnetic permeability, which is difficult to have practical application value. In this step, a combin...

experiment example 1

[0034] Select coarse FeSiCr powder with a particle size of 30μm or more and fine FeSiCr powder with a particle size of 15μm; first, mix the two FeSiCr powders at the ratio of coarse particle = 15wt% and coarse particle = 85wt%. The FeSiCr powder was baked in an oven at 120°C for 60 minutes, while heating the stirring tank to 120°C, put the baked powder into the stirring tank to start stirring, and add aluminum dihydrogen tripolyphosphate with a concentration of 1% In the solution, after stirring for 10 minutes, the stirring tank is heated to 160° C. and then stirred for 3 hours to complete the reaction. After the reaction is completed, the powder is dried. The dried powder is mixed with pure water, 0.2wt% PVA, 0.05wt% silica aqueous solution, dispersant, and defoamer to make slurry, and then pumped to the spray tower by a peristaltic pump and sprayed at 150℃ by a centrifugal spray pan The secondary granular powder is formed during drying. The powder is pressed into a magnetic ...

experiment example 2

[0037] The preparation process of the soft magnetic alloy material is the same as that of Experimental Example 1. The difference is: when the particles are mixed, the ratio of the coarse particle powder and the fine particle powder is adjusted. The adjusted ratio is: coarse particles=18wt%, fine particles=82wt %.

[0038] Similarly, the soft magnetic alloy material prepared in this experimental example was tested, and the test results are shown in the following table.

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Abstract

The invention discloses a magnetically soft alloy material and a preparation method, a power inductor. The preparation method of the magnetically soft alloy material includes steps of S1, mixing coarse particle powder with fine particle powder; S2, reacting the mixed powder with 1-1.5% of phosphate or nitrate solution by mass; after completing reaction, drying the powder, and acquiring drying powder; S3, mixing and pulping the drying powder, water, water-soluble resin, silicon-containing water solution, dispersing agent, and antifoaming agent; spraying and drying the obtained sizing agent and forming secondary particle powder; in relative to the mass of Fe series alloy material, the addition of the water-soluble resin is 0.1-1 wt%, the addition of silicon-containing solution is 0.05-0.2 wt%; S4, pressing and shaping the secondary particle powder under the pressure strength of 1200-2000 MPa; S5, annealing the pressed product for 60-120 minutes at 700-800 DEG C under the protective gas atmosphere. The magnetically soft alloy material is relatively low in loss, and the initial permeability can meet the application demand.

Description

[0001] 【Technical Field】 [0002] The invention relates to a preparation process of soft magnetic alloy materials. [0003] 【Background technique】 [0004] The biggest advantage of soft magnetic alloy materials is that it has a high saturation magnetic flux density (Bs) and good DC superimposition characteristics. However, the insulation resistance of soft magnetic alloy materials is lower and the loss is higher. [0005] As the requirements of devices for miniaturization, high conversion efficiency, and low heat generation become higher, higher requirements are put forward for the performance of soft magnetic alloy materials. Taking power inductors as an example, soft magnetic alloy materials are used to prepare the magnetic cores of power inductors. When power inductors are used at high frequencies, especially at 100KHz and above, on the one hand, the existing magnetic cores made of soft magnetic alloys generate more heat, which causes the performance of the device to deteriorate. ...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F27/255H01F41/02
CPCH01F1/14766H01F27/255H01F41/0246H01F41/0266
Inventor 谈敏刘成华聂敏
Owner SHENZHEN SUNLORD ELECTRONICS
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