Magnetic powder core in-situ preparation method

An in-situ preparation and magnetic powder core technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of magnetic powder coating, magnetic powder core permeability reduction, and no introduction of preparation methods, etc., to overcome the magnetic properties of the matrix The effect of energy reduction, uniform particle size, high magnetic permeability and saturation magnetization

Inactive Publication Date: 2013-12-11
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

[0017] FeCl 3 、NiCl 2 Salt and ZnCl 2 Salt mole Ni x Zn 1-x Fe 2 o 4 ( x =0.8), dissolved in deionized water to form a solution; add citric acid as a complexing agent, the amount of citric acid is the same as the number of moles of metal cations; after mixing well, add ammonia water dropwise to adjust the pH of the solution to 1, and continue to stir to form a sol.

[0018] Add FeSiAl soft magnetic alloy powder into the sol, stir and mix thoroughly, dry at 120°C to form a gel; heat treat in nitrogen or argon at 300°C; the amount of soft magnetic alloy can be determined according to the theoretical generation of ferrite. The soft magnetic alloy in the product is 70wt.%, and the ferrite is 30wt.%.

[0019] Take 0.1wt.% W-6C of the mass of the mixed powder, 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 uniform mix.

[0020] ...

Embodiment 2

[0022] 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), dissolve in deionized water to form a solution; add citric acid as a complexing agent, the amount of citric acid is the same as the molar number of metal cations; after mixing well, add ammonia water dropwise to adjust the pH of the solution to 8, and continue to stir to form a sol.

[0023] Add FeSi soft magnetic alloy powder into the sol, stir and mix thoroughly, dry at 120°C to form a gel; heat treat in nitrogen at 700°C; the amount of soft magnetic alloy can be determined according to the theoretical generation of ferrite, so that the soft magnetic in the product The alloy is 99.9wt.%, and the ferrite is 0.1wt.%.

[0024] Take 4wt.% W-6C of the mass of the mixed powder, 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 evenl...

Embodiment 3

[0027] 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), dissolved in deionized water to form a solution; add citric acid as a complexing agent, the amount of citric acid is the same as the molar number of metal cations; after mixing well, add ammonia water dropwise to adjust the pH of the solution to 4, and continue to stir to form a sol;

[0028] Add FeNi soft magnetic alloy powder into the sol, stir and mix thoroughly, dry at 120°C to form a gel; heat treat in argon at 400°C; the amount of soft magnetic alloy can be determined according to the theoretical generation of ferrite, so that the soft magnetic alloy in the product The magnetic alloy is 80wt.%, and the ferrite is 20wt.%.

[0029] Take 0.3wt.% W-6C of the mass of the mixed powder, 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 uni...

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PUM

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Abstract

The invention relates to a magnetic powder core in-situ preparation method. Nanometer ferrite particles with uniform particle sizes are prepared on the surface of a magnetically soft alloy powder surface with a sol-gel method in an in-situ manner, and the pressing and heat treatment processes are adopted to prepare a novel ferrite composited magnetic powder core. The magnetic powder core in-situ preparation method has the advantages that: (1) the sol-gel method is adopted to prepare the Mn-Zn and Ni-Zn ferrite in an in-situ manner, so as to prepare the nanometer particles with uniform and controllable sizes conveniently; (2) the ferrite used as the insulation cladding agent of the magnetically soft alloy powder can overcome the disadvantage that the magnetic property of the base body is reduced when being clad by the traditional non-magnetic substances as the cladding agent, thereby acquiring high magnetic conductivity and saturation magnetization.

Description

technical field [0001] The invention relates to an in-situ preparation method of a magnetic powder core, belonging to the field of material preparation. Background technique [0002] Soft magnetic materials are magnetic materials with low coercive force and high magnetic permeability. Soft magnetic materials are easy to magnetize and demagnetize, and are widely used in electrical and electronic equipment. 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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/24B22F1/02
Inventor 彭晓领李静徐靖才金顶峰王新庆洪波金红晓葛洪良
Owner CHINA JILIANG UNIV
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