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Iron-based soft magnetic composite magnetic powder core and preparation method thereof

A technology of soft magnetic composite and magnetic powder core, which is applied in the direction of magnetic materials, magnetic objects, and inorganic materials, etc., can solve the problems of poor insulation, low saturation magnetic induction, and poor thermal stability of magnetic powder cores, and achieve high saturation magnetic induction, iron Low loss and good thermal stability

Active Publication Date: 2014-10-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared magnetic powder core has the defects of poor insulation, large iron loss, low saturation magnetic induction and poor thermal stability.

Method used

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  • Iron-based soft magnetic composite magnetic powder core and preparation method thereof

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Embodiment 1

[0035] An iron-based soft magnetic composite magnetic powder core and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0036] The first step, surface modification of iron-based alloy powder

[0037] According to the mass ratio of iron-based alloy powder powder: absolute ethanol: silane coupling agent: distilled water is 1: (6-7): (0.04-0.05): (0.20-0.25), the iron-based alloy powder, absolute ethanol , silane coupling agent and distilled water are sequentially added into the reaction vessel, and stirred at 40-45° C. for 1.5-2.0 hours to obtain a mixed solution containing surface-modified iron-based alloy powder.

[0038] The second step, preparation of core-shell heterostructure composite powder

[0039] Under stirring conditions at 40-45°C, firstly add ethyl orthosilicate to the mixed solution containing surface-modified iron-based alloy powder, then add ammonia water, and continue stirring for 8-10 hours; then u...

Embodiment 2

[0053] An iron-based soft magnetic composite magnetic powder core and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0054] The first step, surface modification of iron-based alloy powder

[0055] According to the mass ratio of iron-based alloy powder: absolute ethanol: silane coupling agent: distilled water is 1: (7-8): (0.05-0.06): (0.25-0.30), the iron-based alloy powder, absolute ethanol, The silane coupling agent and distilled water are sequentially added into the reaction vessel, and stirred at 45-50° C. for 2.5-3.0 hours to obtain a mixed solution containing surface-modified iron-based alloy powder.

[0056] The second step, preparation of core-shell heterostructure composite powder

[0057] Under stirring conditions at 45-50°C, first add methyl orthosilicate to the mixed solution containing surface-modified iron-based alloy powder, then add ammonia water, and continue stirring for 10-12 hours; then use a...

Embodiment 3

[0071] An iron-based soft magnetic composite magnetic powder core and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0072] The first step, surface modification of iron-based alloy powder

[0073] According to the mass ratio of iron-based alloy powder: absolute ethanol: silane coupling agent: distilled water is 1: (8-9): (0.06-0.07): (0.30-0.35), iron-based alloy powder, absolute ethanol, The silane coupling agent and distilled water are sequentially added into the reaction vessel, and stirred at 50-55° C. for 1.0-1.5 hours to obtain a mixed solution containing surface-modified iron-based alloy powder.

[0074] The second step, preparation of core-shell heterostructure composite powder

[0075] Under stirring conditions at 50-55°C, firstly add ethyl orthosilicate to the mixed solution containing surface-modified iron-based alloy powder, then add ammonia water, and continue stirring for 12-14 hours; then use abso...

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Abstract

The invention relates to an iron-based soft magnetic composite magnetic powder core and a preparation method thereof. The invention adopts the technical scheme as follows: sequentially adding iron-based alloy powder, absolute ethyl alcohol, a silane coupling agent and distilled water into a reaction vessel according to the mass ratio of 1:(6-10):(0.04-0.10):(0.2-0.4), and stirring; adding tetraethyl orthosilicate or methyl silicate, then adding ammonia water, stirring continuously, washing, filtering and drying; placing the obtained composite powder with a core-shell heterostructure into an annealing furnace, performing heat preservation for 1-3 h under the condition of 600-800 DEG C, performing furnace cooling and performing compression moulding; sintering for 1-10 h under the condition of 900-1350 DEG C, so that the iron-based soft magnetic composite magnetic powder core is obtained after furnace cooling. The prepared iron-based soft magnetic composite magnetic powder core has the characteristics that the insulating property is good, the iron loss is low, high magnetic strength is achieved, the heat stability is good and the service life is prolonged when the iron-based soft magnetic composite magnetic powder core is used at a higher environment temperature.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic composite magnetic powder cores. Specifically relates to an iron-based soft magnetic composite magnetic powder core and a preparation method thereof. Background technique [0002] The magnetic powder core is a composite magnetic material prepared by powder metallurgy after the soft magnetic powder is insulated and coated. According to the material that constitutes the magnetic powder core, the magnetic powder core can be divided into iron powder core, permalloy magnetic powder core, sendust magnetic powder core, amorphous magnetic powder core and nanocrystalline magnetic powder core. Iron-based magnetic powder core is a kind of magnetic material with high cost performance, which has broad application space in the fields of power factor correction circuit, pulse flyback transformer, energy storage filter inductor and line filter. However, as the operating frequency increases, the iron loss ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/24B22F1/02B22F3/16
Inventor 樊希安王健吴朝阳李光强甘章华
Owner WUHAN UNIV OF SCI & TECH
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