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Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof

A magnetic powder core and magnetic permeability technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of reducing the magnetic permeability of soft magnetic composite materials, high production environment requirements, and low uniformity of insulating layers. To achieve the effect of ensuring high saturation magnetization, ensuring thickness and reducing porosity

Active Publication Date: 2018-07-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor heat resistance of the organic coating material, the soft magnetic composite material prepared by this coating layer material can only be thermally processed when the temperature is lower than 200 ° C. When the temperature is too high, the organic coating material That is, it begins to soften and melt, and the adjacent iron powder particles form effective contact, resulting in a sharp drop in the resistivity of the material, thus losing its insulating effect, and too much organic matter coated will greatly reduce the magnetic properties
[0004] At present, the more common and applicable magnetic powder coating method is inorganic coating treatment. Chinese patent 201310351622.4 uses the sol-gel method to achieve Al 2 o 3 Coating on the surface of Fe powder, but the whole preparation process is more complicated, and there are many influencing factors, which is not conducive to controlling the uniformity of the product, takes a long time, and the production efficiency is low, and the non-magnetic oxide coating reduces the magnetic properties of the soft magnetic composite material. Conductivity
In addition, Chinese patent 201010621275.9 adopts the method of spark plasma sintering to obtain soft ferrite-coated metal magnetic powder. The production environment required for sintering equipment is relatively high, and it is only carried out in the laboratory at present, which is not conducive to large-scale production

Method used

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  • Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof
  • Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof
  • Magnetic powder core material with stable magnetic permeability and low loss and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh 47g of water-atomized pure Fe powder with an average particle size of 75μm in a beaker, add ammonia water that can wet the iron powder, stir clockwise with a glass rod for 20min, and then weigh 3g of Fe powder with a particle size of 20nm 3o 4 Powder, premixed in a V-blender. Use a planetary ball mill to carry out dry ball milling, and take the Fe / Fe prepared by dry ball milling 3 o 4 Core-shell structure coated powder 4g, the scanning electron microscope picture of the prepared coated powder is as follows figure 1 As shown, comparing the powder surface morphology before and after ball milling, it can be seen that the smooth water atomized pure Fe powder surface is compounded in situ under the action of ball milling to obtain soft magnetic composite powder. Using VSM equipment to test the saturation magnetic induction of composite powder, such as image 3 As shown, it can be known that its saturation magnetic induction is 207emu / g, which is only 5.9% lower tha...

Embodiment 2

[0043] Weigh 47g of water-atomized pure Fe powder with an average particle size of 300μm in a beaker, add ammonia water that can wet the iron powder, stir clockwise with a glass rod for 20min, and then weigh 3g of Fe powder with a particle size of 20nm 3 o 4 Powder, premixed in a V-blender. Use a planetary ball mill to carry out dry ball milling, and take the Fe / Fe prepared by dry ball milling 3 o 4 Core-shell structure coating powder 4g, add epoxy-modified silicone resin with a mass fraction of 1% soft magnetic powder, fully mechanically stir at 80°C, and then put the dry powder into a ring-shaped alloy steel mold for room temperature pressing , pressed at a pressurization rate of 5MPa / s, and held at 800Mpa for 3min to obtain an iron / ferric oxide block composite material with an outer diameter of 20mm, an inner diameter of 12mm, and a height of 3mm. The block is subjected to vacuum heat treatment at 450°C for 1h, and the vacuum degree is ≤10 -3 Pa. Utilize the B-H analyz...

Embodiment 3

[0047] Weigh 47g of water-atomized pure Fe powder with an average particle size of 75μm in a beaker, add ammonia water that can wet the iron powder, stir clockwise with a glass rod for 20min, and then weigh 3g of Mn powder with a particle size of 50nm 0.6 Zn 0.4 Fe 2 o 4 Powder, premixed in a V-blender. Using planetary ball mill for dry ball milling, Figure 5 Fe / Mn obtained after high energy ball milling 0.6 Zn 0.4 Fe 2 o 4 From the scanning electron microscope image of the composite powder, it can be seen that the ball milling process has the same effect on oxides of different compositions or particle sizes, and can obtain soft magnetic composite powder with uniform oxide coating on the surface. Fe / Mn prepared by dry ball milling 0.6 Zn 0.4 Fe 2 o 4 Core-shell structure coating powder 4g, add epoxy-modified silicone resin with a mass fraction of 1% soft magnetic powder, add amorphous iron silicon boron powder 0.5g, fully mechanically stir at 80°C, and then put the...

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Abstract

The invention relates to a magnetic powder core material with stable magnetic permeability and low loss and a preparation method thereof. First modifying the surface of the iron powder; preparing iron / ferrite composite powder with core-shell structure by high-energy ball milling; mixing the composite powder with the modified powder and then filling the mixture into an alloy steel mold for normal temperature pressing to obtain iron / ferrite soft magnetic composite magnetic powder cores; then performing subsequent heating treatment on the magnetic powder cores. Compared with the prior art, the present invention utilizes a ball milling method to prepare iron / ferrite coated powder. The process is short in time, uniform in coating, and simple in operation. At the same time, the present inventionuses a ferrimagnetic ferrite as an insulating coating agent, which reduces the magnetic dilution phenomenon caused by a non-magnetic substance as a coating agent. The suitable heat treatment temperature avoids the reaction between iron and ferrite during heat treatment to form magnetic disadvantageous components, ensures high saturation magnetization of magnetic powder core, high magnetic permeability, reduces loss, and obtains magnetic permeability of soft magnetic composite magnetic powder core.

Description

technical field [0001] The invention relates to a soft magnetic composite magnetic powder core, in particular to an iron / ferrite soft magnetic composite magnetic powder core with stable magnetic permeability and low loss and a preparation method thereof. Background technique [0002] During the development of soft magnetic materials in high-power magnetic technology, new concepts, new materials, and new structures are constantly emerging in order to increase operating frequency, reduce electromagnetic losses, and reduce noise. The replacement cycle is getting shorter and shorter. The original situation of using silicon steel for power frequency and soft ferrite for medium and high frequency has been broken. Soft magnetic composite materials (including soft magnetic powder cores) absorb the advantages of soft magnetic metal materials and ferrite at the same time, have a wider and higher operating frequency range, excellent soft magnetic properties, and reasonable costs. In th...

Claims

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Application Information

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IPC IPC(8): H01F1/33H01F1/147H01F1/22B22F1/00B22F3/02B22F3/24
CPCH01F1/14791H01F1/22H01F1/33B22F3/02B22F3/24B22F2003/248B22F1/145
Inventor 谢玉叶严彪
Owner TONGJI UNIV
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