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Insulating full inorganic binder for metal soft magnetic powder core and use method thereof

An inorganic adhesive and metal soft magnetic technology, which is applied in the field of insulating all-inorganic adhesives, can solve the problems of poor water resistance of phosphate, affecting mechanical and magnetic properties, and changes in the performance of magnetic powder cores, so as to improve mechanical strength, Excellent magnetic properties and mechanical properties, the effect of improving strength

Active Publication Date: 2018-03-27
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water resistance of phosphate is poor, and the performance of the magnetic powder core changes in an environment with high humidity; water glass is strongly alkaline, and it is easy to precipitate alkali on the surface of the magnetic powder core, which affects its mechanical and magnetic properties.

Method used

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  • Insulating full inorganic binder for metal soft magnetic powder core and use method thereof
  • Insulating full inorganic binder for metal soft magnetic powder core and use method thereof
  • Insulating full inorganic binder for metal soft magnetic powder core and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Mix anhydrous sodium tetraborate, sodium silicate, mica, and albite with a particle size of less than 3 microns and passivated sendust metal powder, wherein the inorganic binder accounts for 2.0% of the total mass of the magnetic powder. The mass composition of the inorganic binder is as follows: anhydrous sodium tetraborate accounts for 50 wt%, sodium silicate accounts for 6 wt%, mica accounts for 20 wt%, albite feldspar 20 wt%, and quartz powder 4 wt%. At the same time, 0.3 wt% of the total mass of the metal magnetic powder was added as a release agent zinc stearate.

[0023] 2) The uniformly mixed powder is made into a ring green body. The dimensions of the annular green body are: outer diameter 26.9mm, inner diameter 14.73mm, height 11.15mm. The annular body is heat-treated in a nitrogen atmosphere, and cooled to obtain a sendust magnetic powder core.

[0024] Three tests were carried out on the parallel samples of the finally prepared sendust magnetic powder c...

Embodiment 2

[0027] 1) Mix anhydrous sodium tetraborate, sodium silicate, kaolin, talc, and quartz with a particle size of less than 3 microns with passivated sendust metal powder, wherein the inorganic binder accounts for 2.2% of the total mass of the magnetic powder. The mass composition of the inorganic binder is: anhydrous sodium tetraborate accounts for 60 wt%, sodium silicate accounts for 6 wt%, mica accounts for 15 wt%, potassium feldspar 6, kaolin accounts for 9 wt%, and quartz powder accounts for 4 wt%. At the same time, 0.3 wt% of the total mass of the magnetic powder was added as a release agent zinc stearate.

[0028] 2) The uniformly mixed powder is pressed into a ring green body. The dimensions of the annular green body are: outer diameter 33.00mm, inner diameter 19.90mm, height 10.67mm. The annular body is heat-treated in a nitrogen atmosphere to obtain a sendust magnetic powder core. Three tests were carried out on the parallel samples of the finally prepared sendust magn...

Embodiment 3

[0031] 1) Mix anhydrous sodium tetraborate, sodium silicate, kaolin, talc, and quartz with a particle size of less than 3 microns and passivated iron-silicon metal powder, wherein the inorganic binder accounts for 2.2% of the total mass of the magnetic powder. The mass composition of the inorganic binder is: 65 wt% of anhydrous sodium tetraborate, 7 wt% of sodium silicate, 10 wt% of kaolin, 10 wt% of talc, and 8 wt% of quartz powder. At the same time, 0.3 wt% of the total mass of the magnetic powder was added as a release agent zinc stearate.

[0032] 2) The uniformly mixed powder is pressed into a ring green body. The dimensions of the annular green body are: outer diameter 17.27mm, inner diameter 9.65mm, height 6.35mm. The annular blank is heat treated in a nitrogen atmosphere, and cooled to obtain a ferrosilicon magnetic powder core.

[0033] Three tests were carried out on the parallel samples of the iron-silicon magnetic powder cores finally prepared, and the properties...

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Abstract

The invention discloses an insulating full inorganic binder for metal soft magnetic powder core and belongs to the technical field of magnetic material preparation. The insulating full inorganic binder is composed of borate, silicates, aluminosilicates and quartz; the mass compositions are: 48 to 70% borate, 5 to 8 wt% silicate, 20 to 40wt% aluminosilicates, 2 to 8 wt% quartz powder, wherein the borate is anhydrous sodium tetraborate powder; the silicate is sodium silicate powder; the aluminosilicates are two or more selected from talc, kaolin, albite, mica and potassium feldspar. The heat resistance temperature of the insulating full inorganic binder of the invention reaches 1000 DEG C; the invention can significantly improve the mechanical strength of the magnetic powder core, and the prepared magnetic powder core has comprehensive excellent magnetic properties and mechanical properties. The present invention is particularly suitable for iron-based magnetic powder cores and can significantly improve its high frequency performance and quality factors.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to an insulating all-inorganic adhesive for a soft magnetic alloy magnetic powder core and a method for using the same. Background technique [0002] Metal soft magnetic powder core is a kind of composite soft magnetic material obtained by mixing soft magnetic alloy powder with insulating agent and binder uniformly, pressing and molding, and heat-treating. Metal soft magnetic powder cores are widely used because of their high magnetic flux density and high magnetic permeability. The role of the insulating binder on the magnetic powder core is to increase the fluidity of the magnetic powder particles, enhance the insulation effect and improve the mechanical properties of the magnetic powder core. [0003] Binders are divided into organic and inorganic. Organic types include phenolic resin, epoxy resin and silicone resin, etc., which can have better...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/22
Inventor 郑翠红赵利明方道来杨磊朱虹玲檀杰
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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