Composite magnetic powder core and preparation method thereof

A magnetic powder core and mixed powder technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as the inability to coat magnetic powder, the decrease in magnetic permeability of magnetic powder cores, and the lack of introduction of preparation methods. Effects of reduced matrix magnetic properties, uniform particle size, high permeability and saturation magnetization

Inactive Publication Date: 2013-12-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the preparation methods of magnetic powder cores used in a series of patents such as Chinese patents 97102244.5, 200480021670.6, and 200680001781.2, the insulating layers are all non-magnetic materials, and their addition leads to a decrease in the magnetic permeability of the magnetic powder core.
The manganese zinc ferrite in the patent 200610124964.2 does not introduce the preparation method, and the size is 200 mesh, which is equivalent to the particle size of iron-based magnetic powder, so it cannot effectively coat the magnetic powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 0.2g of phosphoric acid and heat it to 85°C in a water bath. Slowly add 100g FeSiAl soft magnetic alloy, stir to make the two fully mixed and react, and passivate for 30min. FeCl 3 、NiCl 2 Salt and ZnCl 2 Salt mole Ni x Zn 1-x Fe 2 o 4 ( x =0.8) dispersed in 50ml of ethylene glycol, FeCl 3 To 0.5mmol, stir until completely dissolved. Add 1.54gCH 3 COONH 4 and 0.8ml polyethylene glycol, stirred for 30 minutes.

[0013] The precursor solution and the passivated soft magnetic alloy powder were transferred to a stainless steel autoclave with stirring function, and stirred and heated at 160°C for 24h. The resulting product was washed several times with ethanol and dried at 80 °C.

[0014] Take 0.1wt.% of W-6C, pour it into 50ml of acetone and stir to dissolve it, pour it into the above mixed powder in a water bath at 75°C, stir well for 1.5h until the mixture is evaporated to dryness, and the powder is evenly mixed.

[0015] The powder was pressed into a d...

Embodiment 2

[0017] Take 0.6g of phosphoric acid and heat it to 85°C in a water bath. Slowly add 10g of FeSi soft magnetic alloy, stir to make the two fully mixed and react, and passivate for 30min. Fe(NO 3 ) 3 , Ni (NO 3 ) 2 and Zn (NO 3 ) 2 Moore than Ni x Zn 1-x Fe 2 o 4 ( x =0.5) dispersed in 50ml of ethylene glycol, Fe (NO 3 ) 3 Salt 0.5mmol, stirred until completely dissolved. Add 1.54gCH 3 COONH 4 and 0.8ml polyethylene glycol, stirred for 30 minutes.

[0018] The precursor solution and the passivated soft magnetic alloy powder were transferred to a stainless steel autoclave with stirring function, and stirred and heated at 180°C for 12h. The resulting product was washed several times with ethanol and dried at 80 °C.

[0019] Take 4wt.% of W-6C, pour it into 50ml of acetone and stir to dissolve it, pour it into the above mixed powder in a water bath at 75°C, stir well for 2 hours until the mixture is evaporated to dryness, and the powder is evenly mixed.

[0020] T...

Embodiment 3

[0022] Take 0.09g of phosphoric acid and heat it to 85°C in a water bath. Slowly add 2.8g FeNi soft magnetic alloy, stir to make the two fully mixed and react, and passivate for 30min. Will Fe 2 (SO 4 ) 3 , NiSO 4 and ZnSO 4 Moore than Ni x Zn 1-x Fe 2 o 4 ( x =0.6) dispersed in 500ml of ethylene glycol, Fe 2 (SO 4 ) 3 5mmol, stirred until completely dissolved. Add 15.4gCH 3 COONH 4 and 8ml polyethylene glycol, stirred for 30 minutes.

[0023] The precursor solution and the passivated soft magnetic alloy powder were transferred to a stainless steel autoclave with stirring function, and stirred and heated at 200° C. for 8 hours. The resulting product was washed several times with ethanol and dried at 80 °C.

[0024] Take 2wt.% of W-6C, pour it into 50ml of acetone and stir to dissolve it, pour it into the above mixed powder in a water bath at 75°C, stir well for 2 hours until the mixture is evaporated to dryness, and the powder is evenly mixed.

[0025] The po...

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PUM

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Abstract

The invention relates to a composite magnetic powder core and a preparation method of the composite magnetic powder core. According to the technical scheme, nanometer ferrite particles with even size are prepared on the surface of soft magnetic alloy powder through a hydrothermal method in a root-positioning mode, and a novel ferrite composite magnetic powder core is prepared through the pressing and thermal processing technology. The composite magnetic powder core and the manufacturing method of the composite magnetic powder core have the advantages that due to the fact that manganese zinc ferrite and nickel zinc ferrite are prepared through a hydrothermal method and a root position method, nanometer particles with controllable and even size can be prepared conveniently; the ferrite can be used as an insulated coating agent of the soft magnetic alloy powder, the defect that magnetic performance of a substrate is reduced when traditional nonmagnetic substances are used as the coating agent are overcome, and high magnetic conductivity and saturation magnetization strength can be obtained.

Description

technical field [0001] The invention relates to a composite magnetic powder core and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] Soft magnetic materials are ferromagnetic or ferrimagnetic substances with strong magnetism, which are easy to magnetize and demagnetize. There are many types of soft magnetic materials, which can be divided into metal soft magnetic materials, soft ferrite and magnetic powder cores. Ferrite soft magnetic material has high resistivity, so it has obvious advantages in the middle and high frequency bands, but because it is a ferrimagnetic material, the saturation magnetization is low, which cannot meet the increasing power requirements of electronic equipment, so it is used in many high-precision Pointed fields cannot be applied. The advantage of metal soft magnetism lies in its high saturation magnetization, but it has the outstanding disadvantage of low resistivity, which leads to gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F41/02
Inventor 彭晓领李静徐靖才王新庆金顶峰洪波金红晓葛洪良
Owner CHINA JILIANG UNIV
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