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Ferrite composite magnetic powder core and preparing method thereof

A magnetic powder core and ferrite technology, which is applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, and electrical components, can solve the problems of reduced magnetic permeability of magnetic powder cores, no introduction of preparation methods, and inability to coat magnetic powders. Achieve the effects of preventing failure, overcoming the reduction of the magnetic properties of the matrix, and facilitating the size of the particles

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 Chinese 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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  • Ferrite composite magnetic powder core and preparing method thereof
  • Ferrite composite magnetic powder core and preparing method thereof
  • Ferrite composite magnetic powder core and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] FeCl 3 、NiCl 2 Salt and ZnCl 2 Salt mole Ni x Zn 1-x Fe 2 o 4 ( x =0.2) 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. The mixture was transferred to a stainless steel autoclave and heated at 160 °C for 24 h. The resulting product was washed several times with ethanol and dried at 80 °C.

[0026] Take a certain amount of phosphoric acid and heat it to 85°C in a water bath. Slowly add the FeSiAl soft magnetic alloy to be passivated, stir to make the two fully mixed and react, passivate for 30min, and use 0.2 wt.% phosphoric acid.

[0027] Mechanically mix the passivated 70wt.% soft magnetic alloy with 30wt.% nickel-zinc ferrite particles, and add 0.2% water glass inorganic binder by mass of the mixed powder to continue mixing evenly.

[0028] The powder was pressed into a dense ring under a pressure of 1.9 GPa. Annealing heat treatment is...

Embodiment 2

[0030] 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 =0.3) 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. The mixture was transferred to a stainless steel autoclave and heated at 180 °C for 12 h. The resulting product was washed several times with ethanol and dried at 80 °C.

[0031] Take a certain amount of phosphoric acid and heat it to 85°C in a water bath. Slowly add the FeSi soft magnetic alloy to be passivated, stir to make the two fully mixed and react, passivate for 30min, and the phosphoric acid dosage is 6 wt.%.

[0032] Mechanically mix the passivated 99.9wt.% soft magnetic alloy with 0.1wt.% nickel-zinc ferrite particles, and add 0.7% boron oxide inorganic binder by mass of the mixed powder to continue mixing evenly.

[0033] The powder was pressed into a dense ring under a pressure of...

Embodiment 3

[0035] Will Fe 2 (SO 4 ) 3 , NiSO 4 and ZnSO 4 Moore than Ni xZn 1-x Fe 2 o 4 ( x =0.6) dispersed in 50ml of ethylene glycol, Fe 2 (SO 4 ) 3 To 0.5mmol, stir until completely dissolved. Add 1.54gCH 3 COONH 4 and 0.8ml polyethylene glycol, stirred for 30 minutes. The mixture was transferred to a stainless steel autoclave and heated at 200 °C for 8 h. The resulting product was washed several times with ethanol and dried at 80 °C.

[0036] Take a certain amount of phosphoric acid and heat it to 85°C in a water bath. Slowly add the FeNiMo soft magnetic alloy to be passivated, stir to make the two fully mixed and react, passivate for 30min, and the phosphoric acid dosage is 3 wt.%.

[0037] Mechanically mix the passivated 85wt.% soft magnetic alloy with 15wt.% nickel-zinc ferrite particles, and add 1% of the mixed powder mass as an inorganic binder of low-melting glass powder to continue mixing evenly.

[0038] The powder was pressed into a dense ring under a pres...

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Abstract

The invention relates to a ferrite composite magnetic powder core and a preparing method thereof. According to the technical scheme, a hydrothermal method is used for preparing nano nickel zinc ferrite particles with even particle sizes, the nano nickel zinc ferrite particles are used as insulation media to coat magnetically soft alloy powder which is passivated by phosphoric acid, an inorganic adhesive is added, and a novel nickel zinc ferrite composite magnetic powder core is prepared after compression and heat treatment. The ferrite composite magnetic powder core and the preparing method thereof have the advantages that first, due to the fact that the ferrite is used as the insulation coating agent of the magnetically soft alloy powder, the defect that the magnetic performance of a substrate is lowered due to the fact that traditional nonmagnetic substances are used as the coating agent is overcome, and high magnetic conductivity and saturation magnetization can be achieved; second, the hydrothermal method is used for preparing the ferrite, and controllable nano particles with even sizes can be prepared conveniently; third, inorganic materials are used as the coating agent, and magnetic powder devices can be prevented from losing efficacy when being used at a high temperature.

Description

technical field [0001] The invention relates to a ferrite composite magnetic powder core and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] Soft magnetic materials are the most widely used and most diverse type of magnetic materials. They 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 roughly divided into metal soft magnetic materials, soft ferrite and magnetic powder cores. The advantage of metal soft magnetism lies in its high saturation magnetization, but it has the outstanding disadvantage of low resistivity, which leads to great eddy current loss and a sharp drop in magnetic permeability when used at high frequencies, so it cannot be used at medium and high frequencies. is a fatal flaw. Ferrite soft magnetic material is born with high resistivity, so it has obvious advantages in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/37H01F41/02
Inventor 彭晓领王新庆徐靖才李静金顶峰洪波金红晓葛洪良
Owner CHINA JILIANG UNIV
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