Preparation method of FeSiAl/Mn-Zn ferrite composite magnetic powder core

A technology of ferrite and magnetic powder cores, which is applied in the field of magnetic materials and device preparation, can solve problems such as complicated steps and unfavorable magnetic permeability of sendust magnetic powder cores, achieve strength and stability, and solve the problem of non-magnetic phase magnetic dilution , Improve the effect of magnetic permeability

Inactive Publication Date: 2017-02-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201210443610.X discloses a preparation process of a high magnetic flux density and low core loss sendust magnetic powder core. The target is obtained through steps such as powder selection, pretreatment, passivation treatment, insulation coating treatment, compression molding, and heat treatment. The prepared product has high magnetic permeability and low core loss, but the steps are relatively complicated
Since the insulating cladding layer has no magnetism, the magnetism is diluted, which is not conducive to the further improvement of the permeability of the sendust magnetic powder core

Method used

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  • Preparation method of FeSiAl/Mn-Zn ferrite composite magnetic powder core
  • Preparation method of FeSiAl/Mn-Zn ferrite composite magnetic powder core
  • Preparation method of FeSiAl/Mn-Zn ferrite composite magnetic powder core

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Put the FeSiAl magnetic powder in a ball mill for high-energy ball milling to achieve flattening. The ball-to-material ratio is 12:1, and the ball mill is 40h.

[0036] 2. Coat the surface of the flattened sendust magnetic powder with a Mn-Zn ferrite insulating layer by co-precipitation method, the co-precipitation reaction temperature is 60°C, and the reaction time is 30 minutes.

[0037] 3. With FeCl 3 , ZnCl 2 and MnCl 2 4H 2 O is used as raw material to synthesize Mn-Zn ferrite precursor, according to Mn 0.4 Zn 0.6 Fe 2 o 4 Middle Fe 3+ : Zn 2+ :Mn 2+ The molar ratio is 10:3:2 Weigh raw materials, dissolve in deionized water, get FeCl 3 -ZnCl 2 -MnCl 2 Mix the salt solution.

[0038] 4. According to Mn 0.4 Zn 0.6 Fe 2 o 4 The mass ratio of / FeSiAl magnetic powder is 6%, and the flattened FeSiAl magnetic powder is weighed, poured into deionized water, and heated to 60°C. Slowly drop the corresponding amount of FeCl into the heated FeSiAl magneti...

Embodiment 2

[0044] 1. Put the FeSiAl magnetic powder in a ball mill for high-energy ball milling to achieve flattening. The ball-to-material ratio is 12:1, and the ball mill is 40h.

[0045] 2. Coat the surface of the flattened sendust magnetic powder with Mn-Zn ferrite insulating layer by co-precipitation method, the co-precipitation reaction temperature is 70°C, and the reaction time is 30 minutes.

[0046] 3. With FeCl 3 , ZnCl 2 and MnCl 2 4H 2 O is used as raw material to synthesize Mn-Zn ferrite precursor, according to Mn 0.4 Zn 0.6 Fe 2 o 4 Middle Fe 3+ : Zn 2+ :Mn 2+ The molar ratio is 10:3:2 Weigh raw materials, dissolve in deionized water, get FeCl 3 -ZnCl 2 -MnCl 2 Mix the salt solution.

[0047] 4. According to Mn 0.4 Zn 0.6 Fe 2 o 4 The mass ratio of / FeSiAl magnetic powder is 6%, and the flattened FeSiAl magnetic powder is weighed, poured into deionized water, and heated to 70°C. Slowly drop the corresponding amount of FeCl into the heated sendust magnetic...

Embodiment 3

[0052] 1. Place the sendust magnetic powder in a ball mill for high-energy ball milling with a ball-to-material ratio of 12:1, and ball mill for 40 hours to obtain flat sendust magnetic powder.

[0053] 2. Coat the surface of the flattened sendust magnetic powder with Mn-Zn ferrite insulating layer by co-precipitation method, the co-precipitation reaction temperature is 80°C, and the reaction time is 30 minutes.

[0054] 3. With FeCl 3 , ZnCl 2 and MnCl 2 4H 2 O is used as raw material to synthesize Mn-Zn ferrite precursor, according to Mn 0.4 Zn 0.6 Fe 2 o 4 Middle Fe 3+ : Zn 2+ :Mn 2+ The molar ratio is 10:3:2 Weigh raw materials, dissolve in deionized water, get FeCl 3 -ZnCl 2 -MnCl 2 Mix the salt solution.

[0055] 4. According to Mn 0.4 Zn 0.6 Fe 2 o 4 The mass ratio of / FeSiAl magnetic powder is 6%, and the flattened FeSiAl magnetic powder is weighed, poured into deionized water, and heated to 80°C. Slowly drop the corresponding amount of FeCl into the ...

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Abstract

The invention discloses a preparation method of an FeSiAl / Mn-Zn ferrite composite magnetic powder core. The method comprises the steps of carrying out in-situ synthesis on a ferric salt, a zinc salt and a manganese salt as raw materials and an NaOH solution as a precipitant through a chemical codeposition method on the surface of FeSiAl magnetic powder at 50-80 DEG C to form an Mn-Zn ferrite precursor and carrying out high-temperature roasting to obtain FeSiAl / Mn-Zn ferrite composite magnetic powder; and mixing the FeSiAl / Mn-Zn ferrite composite magnetic powder with epoxy resin and magnesium stearate evenly and then preparing the FeSiAl / Mn-Zn ferrite composite magnetic powder core through cold press molding. According to the method, a uniform and complete ferrite coating layer is formed on the surface of the FeSiAl magnetic powder, so that electric contact among metal magnetic powder particles is blocked; the resistivity of the composite magnetic powder core is improved; the eddy current loss of the composite magnetic powder core at a high frequency is effectively reduced; the prepared magnetic powder core is low in loss and high in magnetic conductivity; and the application field of the FeSiAl magnetic powder core is expanded.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and device preparation, and more specifically relates to a method for preparing a FeSiAl / Mn-Zn ferrite composite magnetic powder core. Background technique [0002] The magnetic powder core is a kind of soft magnetic material made by mixing and pressing magnetic material powder and insulating medium. Because its resistivity is much larger than that of alloys, the eddy current loss is small and can be used at higher frequencies. And because of its high saturation magnetization, it can also be used at higher power. These characteristics make the magnetic powder core have advantages that other magnetic materials cannot match in many applications. At present, it has been widely used in inductance filters, choke coils and switching power supply cores in products such as telecommunications, radar, television and power supplies. [0003] With the rapid development of electronic technology, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/37H01F1/147B22F1/00B22F3/02B22F3/24
CPCH01F1/14791H01F1/37B22F3/02B22F3/24B22F2003/248B22F2003/023B22F1/10
Inventor 何玉定杨元政谢致薇陈先朝
Owner GUANGDONG UNIV OF TECH
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