Iron-silicon composite magnetic powder core with surface coating structure and preparation method of iron-silicon composite magnetic powder core

A surface coating and magnetic powder core technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as unfavorable green development, large air pollution, and cumbersome operations

Pending Publication Date: 2021-09-07
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is cumbersome to operate, and the heat treatment process steps such as annealing in industrial production are relatively polluting to the air.
Generally speaking, it is not conducive to the requirements of green development

Method used

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  • Iron-silicon composite magnetic powder core with surface coating structure and preparation method of iron-silicon composite magnetic powder core
  • Iron-silicon composite magnetic powder core with surface coating structure and preparation method of iron-silicon composite magnetic powder core
  • Iron-silicon composite magnetic powder core with surface coating structure and preparation method of iron-silicon composite magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] use as figure 1 The synthetic route shown for the preparation of SiO 2 The Fe-6.5wt% Si magnetic powder core of coating, concrete steps are as follows:

[0039] Add 5gFe-6.5wt%Si magnetic powder into 167mL of absolute ethanol, stir mechanically for 10 minutes at a stirring speed of 200rpm to disperse the magnetic powder evenly, then slowly raise the temperature to 50°C, slowly add 0.6g γ-aminopropyltriethyl Oxysilane (APTES), then mechanically stirred at 50°C for 2h; then slowly warmed up to 60°C, first slowly added 2mL of ammonia water dropwise, and then slowly added 4mL of tetraethoxysilane (orthosilicate) for 2h After the dropwise addition, continue the mechanical stirring reaction for 6h, filter after the reaction, wash with absolute ethanol, and vacuum dry at 50°C for 24h to obtain SiO 2 Coated Fe-6.5wt% Si magnetic powder core. During the experiment, the slow temperature rise rate was 2.5°C / min; the slow drop rate of γ-aminopropyltriethoxysilane (APTES) was 0.2...

Embodiment 2

[0046] use as figure 1 The synthetic route shown for the preparation of SiO 2 The Fe-6.5wt% Si magnetic powder core of coating, concrete steps are as follows:

[0047] Add 5gFe-6.5wt%Si magnetic powder into 200mL of absolute ethanol, stir mechanically for 10 minutes at a stirring speed of 200rpm to disperse the magnetic powder evenly, then slowly raise the temperature to 50°C, slowly add 0.6g γ-aminopropyl triethyl Oxysilane (APTES), then mechanically stirred at 50°C for 2h, then slowly warmed up to 60°C, first slowly added 2mL of ammonia water dropwise, and then slowly added dropwise with 4mL tetraethoxysilane (ethyl orthosilicate) for 2h After the dropwise addition, continue the mechanical stirring reaction for 6h, filter after the reaction, wash with absolute ethanol, and vacuum dry at 50°C for 24h to obtain SiO 2 Coated Fe-6.5wt% Si magnetic powder core. During the experiment, the slow temperature rise rate was 2.5°C / min; the slow drop rate of γ-aminopropyltriethoxysila...

Embodiment 3

[0054] use as figure 1 The synthetic route shown for the preparation of SiO 2 The Fe-6.5wt% Si magnetic powder core of coating, concrete steps are as follows:

[0055] Add 5gFe-6.5wt%Si magnetic powder into 250mL of absolute ethanol, stir mechanically for 10 minutes at a stirring speed of 200rpm to disperse the magnetic powder evenly, then slowly raise the temperature to 50°C, slowly add 0.6g γ-aminopropyl triethyl Oxysilane (APTES), then mechanically stirred at 50°C for 2h, then slowly warmed up to 60°C, first slowly added 2mL of ammonia water dropwise, and then slowly added dropwise with 4mL tetraethoxysilane (ethyl orthosilicate) for 2h After the dropwise addition, continue the mechanical stirring reaction for 6h, filter after the reaction, wash with absolute ethanol, and vacuum dry at 50°C for 24h to obtain SiO 2 Coated Fe-6.5wt% Si magnetic powder core. During the experiment, the slow temperature rise rate was 2.5°C / min; the slow drop rate of γ-aminopropyltriethoxysila...

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Abstract

The invention discloses an iron-silicon composite magnetic powder core with a surface coating structure and a preparation method of the iron-silicon composite magnetic powder core. The method comprises the steps of dropwise adding a silane coupling agent into iron-silicon composite magnetic powder dispersed with absolute ethyl alcohol, conducting surface activation on the iron-silicon composite magnetic powder for 1-2 h, then slowing dropwise adding an alkaline solution, then slowing dropwise adding silicate ester, and carrying out surface modification on the activated iron-silicon composite magnetic powder by using the silicate ester to obtain the SiO2-coated iron-silicon composite magnetic powder core. The iron-silicon composite magnetic powder core with the surface coating structure prepared by the method is low in raw material cost, and the preparation process is clean and environment-friendly by adopting a chemical coating method. The coated composite magnetic powder core particles are insulated, so that the loss can be reduced under the condition of keeping the high frequency of the magnetic powder core, the service life is prolonged, and finally, the composite magnetic powder core can be widely applied in the high-frequency and high-power application fields.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to an iron-silicon composite magnetic powder core with a surface coating structure and a preparation method thereof. Background technique [0002] With the miniaturization and weight reduction of modern electronic devices, the electronic field puts forward higher requirements on the performance of iron-based composite magnetic powder: the power loss should be reduced as much as possible while the operating frequency is getting higher and higher. Among the metal magnetic powders, iron-silicon composite magnetic powder is especially suitable for At present, the technical requirements of low voltage and high current, high power density and high magnetic flux quantization have great commercial application prospects in the electronic components and energy industries. However, in the high-frequency and high-power application fields, due to the high loss of iron-silicon comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147H01F1/20
CPCH01F41/02H01F1/14766H01F1/20
Inventor 王斌祖伟皓黄月文
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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