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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  • 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 met

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

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Example Embodiment

[0038] Example 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 20 minutes, and then weigh 3g of Fe with a particle size of 20nm 3 O 4 The powder is premixed in a V-type blender. Use planetary ball mill for dry ball milling, take Fe / Fe prepared by dry ball mill 3 O 4 Core-shell structure coated powder 4g, the obtained coated powder SEM image 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. Use VSM equipment to test the saturation magnetic induction intensity of composite powder such as image 3 As shown, it can be known that its saturation magnetic induction intensity is 207emu / g, which is only 5.9% lower than the saturation m...

Example Embodiment

[0042] Example 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 20 minutes, and then weigh 3g of Fe with a particle size of 20nm 3 O 4 The powder is premixed in a V-type blender. Use planetary ball mill for dry ball milling, take Fe / Fe prepared by dry ball mill 3 O 4 4g core-shell structure coated powder, add epoxy modified silicone resin with a mass fraction of soft magnetic powder of 1%, fully mechanically stir at 80°C, and then put the dry powder into a ring-shaped alloy steel mold to press at room temperature , Pressing at a pressure rate of 5MPa / s, and maintaining pressure at 800Mpa for 3 minutes to obtain an iron / ferric oxide block composite material with a size of 20mm in outer diameter, 12mm in inner diameter and 3mm in height. The block is subjected to vacuum heat treatment at 450℃, 1h, and the vacuum degree is ≤10 -3 Pa. Use the B...

Example Embodiment

[0046] Example 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 the glass rod clockwise for 20 minutes, and then weigh 3g of Mn with a particle size of 50nm 0.6 Zn 0.4 Fe 2 O 4 The powder is premixed in a V-type blender. Use 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 The scanning electron micrograph of the composite powder shows that the ball milling process has the same effect on oxides of different composition or particle size, and can obtain a soft magnetic composite powder with uniform surface oxide coating. Take Fe / Mn prepared by dry ball milling 0.6 Zn 0.4 Fe 2 O 4 4g core-shell structure coating powder, add 1% soft magnetic powder mass fraction of epoxy modified silicone resin, add 0.5g amorphous iron silicon boron powder, fully mechanically stir at 80 ℃, and then put the dry powder into Pre...

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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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