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A kind of three-shell iron-silicon-based soft magnetic composite material and its preparation method

A soft magnetic composite material and three-shell technology, which is applied to the magnetism of inorganic materials, metal processing equipment, transportation and packaging, etc., can solve the problems of high energy and raw material loss, unfavorable large-scale preparation, complex preparation process, etc., and achieve constant conductivity Good magnetic properties, good application prospects, and good chemical stability

Active Publication Date: 2020-03-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulating layer of the obtained soft magnetic composite material is relatively uniform, and the magnetic properties are good, but the preparation process is complicated, the operation is not easy, and the loss of energy and raw materials is large, which is not conducive to mass production.

Method used

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  • A kind of three-shell iron-silicon-based soft magnetic composite material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0034] The first step, composite powder preparation

[0035] According to the iron-silicon alloy powder:water mass ratio of 1:(5-40), the iron-silicon alloy powder is placed in the water, stirred at a water temperature of 30-60°C for 5-10 hours, and solid-liquid separation, A composite powder is obtained.

[0036] The second step, cold forming

[0037] The composite powder is vacuum-dried, loaded into a mold, and cold-pressed under the condition of 300-600 MPa to obtain a green body.

[0038] The third step, sintering

[0039] The green body is placed in a high-temperature sintering furnace, heated to 800-900° C. under vacuum conditions, and sintered for 0.5-1 hour to obtain a sintered green body.

[0040] The fourth step, heat treatment

[0041] The sintered green body is placed in a heat treat...

Embodiment 2

[0046] A three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0047] The first step, composite powder preparation

[0048] According to the iron-silicon alloy powder:water mass ratio of 1:(20-55), the iron-silicon alloy powder is placed in the water, stirred at a water temperature of 35-65°C for 10-15 hours, and solid-liquid separation, A composite powder is obtained.

[0049] The second step, cold forming

[0050] The composite powder is vacuum-dried, loaded into a mold, and cold-pressed under the condition of 450-750 MPa to obtain a green body.

[0051] The third step, sintering

[0052] The green body is placed in a high-temperature sintering furnace, heated to 900-1000° C. under vacuum conditions, and sintered for 1.5-2 hours to obtain a sintered green body.

[0053] The fourth step, heat treatment

[0054] The sintered green body is placed in a heat tre...

Embodiment 3

[0059] A three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0060] The first step, composite powder preparation

[0061] According to the iron-silicon alloy powder:water mass ratio of 1:(35-70), the iron-silicon alloy powder is placed in the water, stirred at a water temperature of 40-70°C for 15-20h, and solid-liquid separation, A composite powder is obtained.

[0062] The second step, cold forming

[0063] The composite powder is vacuum-dried, loaded into a mold, and cold-pressed under the condition of 600-900 MPa to obtain a green body.

[0064] The third step, sintering

[0065] The green body is placed in a high-temperature sintering furnace, heated to 1000-1100° C. under protective atmosphere conditions, and sintered for 2.5-3 hours to obtain a sintered green body.

[0066] The fourth step, heat treatment

[0067] The sintered green body is placed ...

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Abstract

The invention relates to a three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. Its technical scheme is: according to the mass ratio of iron-silicon alloy powder: water is 1: (5-100), put iron-silicon alloy powder in water, stir at 30-80°C for 5-30h, and separate solid and liquid to obtain Composite powder. The composite powder is vacuum-dried, loaded into a mold, and cold-pressed under the condition of 300-1200MPa to obtain a green body. The green body is placed in a high-temperature sintering furnace, and the temperature is raised to 800-1300° C. under vacuum conditions or protective atmosphere conditions, and sintered for 0.5-5 hours to obtain a sintered green body. The sintered green body is placed in a heat treatment furnace, heated to 500-1200°C under vacuum or protective atmosphere, heat-treated for 0.5-5 hours, and cooled with the furnace to prepare a three-shell iron-silicon-based soft magnetic composite material. The invention has simple process and low production cost, and the manufactured product not only has uniform insulating layer, extremely low magnetic loss, but also has high saturation magnetic induction intensity and good constant magnetic permeability.

Description

technical field [0001] The invention belongs to the technical field of iron-silicon-based soft magnetic composite materials. In particular, it relates to a three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. Background technique [0002] FeSi-based soft magnetic composite materials are widely used in inverters, Electronic components such as inductors, transformers, and choke coils are involved in many fields such as motors, telecommunications, and power supplies. [0003] It is worth mentioning that as the frequency of use increases, the eddy current loss of soft magnetic composite materials increases exponentially, and the insulating coating of magnetic particles is undoubtedly the most effective way to reduce eddy current loss. On this basis, insulation coating is mainly divided into two types: organic coating and inorganic coating. The common organic coating method is to mix magnetic particles and organic coating materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F3/10B22F3/24H01F1/22
CPCH01F1/22B22F3/1007B22F3/24B22F2998/10B22F2999/00B22F2003/248B22F1/16B22F2201/20B22F2201/02B22F2201/11B22F3/02
Inventor 樊希安罗自贵李光强李亚伟
Owner WUHAN UNIV OF SCI & TECH
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