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Insulating binder for coating amorphous and nanocrystalline magnetic powder and coating method

A binder and nanocrystalline technology, which is applied in the field of insulating binder and coating covering amorphous and nanocrystalline magnetic powder, can solve the problem of crystallization of amorphous and nanocrystalline magnetic powder, poor mechanical strength, and incomplete coating, etc. problems, to achieve excellent thermal stability and mechanical strength, improve overall performance, and good coating effect

Inactive Publication Date: 2016-01-20
北京电力自动化设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used organic insulating adhesives mainly include: epoxy resin, silicone resin, polyimide, phenolic resin, etc., which are easy to decompose when used alone at high temperature, and have poor thermal stability.
Commonly used inorganic insulating binders mainly include: kaolin, mica, talcum powder, magnesium oxide, aluminum oxide, silicon oxide, titanium oxide, sodium silicate, etc., which are poor in mechanical strength and difficult to process when used alone
[0005] The coating methods of magnetic powder include mechanical mixing method, sol-gel method, etc. The sol-gel method is more complicated and requires high-temperature heat treatment, which is easy to cause crystallization of amorphous and nanocrystalline. In the preparation process, simple mechanical stirring method is usually used. Coating of amorphous and nanocrystalline magnetic powder, but this method is prone to incomplete and uneven coating

Method used

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  • Insulating binder for coating amorphous and nanocrystalline magnetic powder and coating method
  • Insulating binder for coating amorphous and nanocrystalline magnetic powder and coating method
  • Insulating binder for coating amorphous and nanocrystalline magnetic powder and coating method

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Experimental program
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Effect test

Embodiment 1

[0094] The coating pretreatment steps are as follows:

[0095] (1) First, add 5000g of magnetic powder into the housing 7 of the mixer through the feed port 1, and the magnetic powder is Fe 78 Si 9 B 13 Amorphous magnetic powder, the particle size is -100 mesh to +300 mesh.

[0096] (2) then, start mechanical stirring paddle 5, the stirring speed that mechanical stirring paddle 5 is set is 100RPM,

[0097] (3) After that, add the dehydrated ethanol solution of surface modification material (aminopropyltriethoxysilane KH550) in the housing 7 of stirrer again by inlet 1, wherein the consumption of surface modification material is magnetic powder weight 0.5%, the concentration of the surface modification material solution is 0.5wt%.

[0098] (4) Restart the ultrasonic vibrating rod 4, the stirring frequency of the ultrasonic vibrating rod 4 is 30kHz, the stirring time of the ultrasonic vibrating rod 4 and the mechanical stirring paddle 5 are set to be 100min, after the mechan...

Embodiment 2

[0118] In this embodiment, except that the following content is different from embodiment 1, other operation steps are the same as embodiment 1. In this embodiment, the organic binder is polyimide Kapton, and the consumption is the weight of the uncoated magnetic powder 1%; the inorganic binder is alumina, and the dosage is 1% of the weight of the uncoated magnetic powder; the surface modification material is isopropoxy distearic acid acyloxy aluminate DL-411, and the dosage is 0.5% by weight of magnetic powder.

[0119] The coated powder obtained in the present invention can work under the condition of -50°C to 150°C.

[0120] See Table 1 for the performance data of the magnetic powder core obtained in this embodiment.

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Abstract

The invention discloses an insulating binder for coating amorphous and nanocrystalline magnetic powder. The insulating binder comprises an inorganic binder, an inorganic binder and a surface modification material, wherein the surface modification material is one or more of an organic chromium complex, silanes, titanate esters and an aluminate compound. The invention further discloses a method for carrying out coating on the amorphous and nanocrystalline magnetic powder by the insulating binder. The method comprises a pretreatment step, a primary baking step, a powder insulating coating treatment step and a secondary drying step. According to the insulating binder and the coating method disclosed by the invention, the overall performance of an amorphous and nanocrystalline magnetic powder core is improved; and the insulating binder has the advantages of high magnetic conductivity and low loss at a high frequency; and in addition, the amorphous and nanocrystalline magnetic powder core obtained by the method has excellent heat stability and mechanical strength.

Description

technical field [0001] The invention relates to the coating field of magnetic powder, in particular to an insulating binder and a coating method for coating amorphous and nanocrystalline magnetic powder. Background technique [0002] Metal soft magnetic powder core is a kind of soft magnetic material made by mixing and pressing the powder made of metal or alloy soft magnetic material with insulating additives. Since the ferromagnetic particles are small and separated by non-magnetic insulating materials, they can be insulated Eddy current, low loss at high frequency, can be used for electronic components at high frequency. Amorphous and nanocrystalline magnetic powder cores are a new type of metal soft magnetic material developed in recent years. Amorphous or nanocrystalline soft magnetic powders are pressed and bonded to make magnetic powder cores of various shapes. Due to the unique amorphous or microcrystalline atomic structure and excellent magnetic properties of amorph...

Claims

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Application Information

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IPC IPC(8): H01F1/24H01F41/00
Inventor 杜宇吕建伟谢旭霞
Owner 北京电力自动化设备有限公司
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