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Crushing method iron-silicon-aluminum soft magnetic powder core and preparation method thereof

An iron-silicon-aluminum and soft magnetic powder technology is applied in the field of crushing iron-silicon-aluminum soft magnetic powder core and its preparation, which can solve problems such as environmental pollution, and achieve the effects of simple preparation method, easy operation and control, and improvement of DC bias characteristics.

Pending Publication Date: 2020-09-22
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the insulation coating method currently used on a large scale in the market is still dominated by phosphoric acid passivation, which is likely to cause environmental pollution during the production process

Method used

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  • Crushing method iron-silicon-aluminum soft magnetic powder core and preparation method thereof
  • Crushing method iron-silicon-aluminum soft magnetic powder core and preparation method thereof
  • Crushing method iron-silicon-aluminum soft magnetic powder core and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select 1000.0g of sendust magnetic powder whose particle size is -200 mesh, the alloy composition mass percentage is Si 7.0%, Al 8.0%, and the rest is Fe; 2 Powder and 40.0g of water were stirred at room temperature for 15 minutes to form a uniform mixed slurry; then, the mixed slurry was heated to 80°C and kept stirring for 60 minutes. After the heat preservation was completed, the dried sendust The insulating powder is sieved with a 100-mesh sieve (screening out oversized particles); adding 2.0 g of binder silicone resin powder and 8.0 g of release agent zinc stearate to the sieved powder, and mixing Evenly, the magnetic powder to be formed is obtained; the uniformly mixed magnetic powder to be formed is pressed into a powder core blank with a pressing pressure of about 1600MPa, wherein the powder core blank is an annular shape with an outer diameter of 27.00mm x an inner diameter of 14.80mm x a height of 11.18mm Powder core: Using nitrogen as a protective gas, heat t...

Embodiment 2

[0038] Select the commercially available alloy with the particle size of -200 mesh as Si 9.0% and Al 5.0% by mass percentage respectively, and 1000.0g of sendust magnetic powder with the rest being Fe; SiO 2 Powder and 50.0g of water were stirred at room temperature for 25 minutes to form a uniform mixed slurry; then, the mixed slurry was heated to 90°C and kept stirring for 25 minutes. After the heat preservation was completed, the dry sendust was insulated The powder is sieved with a 100-mesh sieve; 3.0 g of binder phenolic resin and 5.0 g of release agent calcium stearate are added to the sieved powder, and mixed uniformly to obtain the magnetic powder to be formed; The pressure is about 1800MPa to press the uniformly mixed powder into a powder core blank, wherein the powder core blank is an annular powder core with an outer diameter of 27.00mm x an inner diameter of 14.80mm x a height of 11.18mm; using nitrogen as a protective gas, the pressed The powder core blanks were ...

Embodiment 3

[0043] Select the commercially available alloy with the particle size of -200 mesh as Si 8.0% and Al 6.0% by mass percentage respectively, and 1000.0g of sendust magnetic powder with the rest being Fe; SiO 2 Powder and 60.0g of water were stirred at room temperature for 35 minutes to form a uniform mixed slurry; then, the mixed slurry was heated to 100°C and kept stirring for 35 minutes. After the heat preservation was completed, the dry sendust was insulated The powder is sieved with a 100-mesh sieve; 5.0 g of binder polyamide resin powder and 7.0 g of release agent talcum powder are added to the sieved powder, and mixed uniformly to obtain the magnetic powder to be formed; The pressure is about 2000MPa to press the uniformly mixed powder into a powder core blank, wherein the powder core blank is an annular powder core with an outer diameter of 27.00mm x an inner diameter of 14.80mm x a height of 11.18mm; using nitrogen as a protective gas, the pressed The powder core blanks...

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Abstract

The invention belongs to the technical field of soft magnetic materials, and particularly relates to a crushing method iron-silicon-aluminum soft magnetic powder core and a preparation method thereof.The preparation method includes the steps that iron-silicon-aluminum magnetic powder with the granularity smaller than 200 meshes is selected, SiO2 powder is used for conducting insulation coating treatment on iron-silicon-aluminum powder particles, and the iron-silicon-aluminum soft magnetic powder core with the effective magnetic conductivity being 75 is prepared; the preparation process is simple and easy to operate, the prepared iron-silicon-aluminum soft magnetic powder core has excellent direct-current bias performance and frequency stability, the direct-current bias performance of the powder core under the condition of 100Oe is higher than 38%, and the volume loss Pcv under the conditions of 50kHz and 100mT is lower than 260mW / cm < 3 >.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and in particular relates to a crushing ferrosilicon aluminum soft magnetic powder core and a preparation method thereof. Background technique [0002] Soft magnetic materials are widely used in power electronics industry, computer technology, telecommunications engineering, etc., and occupy an important position in industrial production. Compared with the early soft magnetic alloy materials, metal soft magnetic powder cores are mixed with ferromagnetic powder and insulating medium to form a composite soft magnetic material through compression molding technology, which has high resistivity, high magnetic flux density, low coercive force, low loss and other advantages. In 1936, Japanese scholars reported the Fe-Si-Al alloy containing 9.6wt.% Si, 5.4wt.% Al, and 85.0wt.% Fe through alloy composition research. Its magnetocrystalline anisotropy constant and magnetostriction coefficie...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/26H01F41/02
CPCH01F1/14791H01F1/26H01F41/0246
Inventor 汤凤林裴晓东骆艳华申保金
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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