High-saturation flux density composite magnetic powder, magnetic core and preparation methods thereof

A technology of magnetic induction and magnetic powder, which is applied in transformer/inductor parts, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of lack of soft magnetic powder and its magnetic core products, poor performance of magnetic core, etc.

Active Publication Date: 2017-10-10
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of the magnetic core obtained by this technology is also poor, and the application frequency range is 100kHz-3MHz, specifically the magnetic permeability is 16-39, and the loss is 1330-4750kW / m 3
[0010] It can be seen that there is currently a lack of soft magnetic powder and its magnetic core products with a Bs value of 1.70T and above and low loss in the field, and new technological breakthroughs and solutions are needed

Method used

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  • High-saturation flux density composite magnetic powder, magnetic core and preparation methods thereof

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preparation example Construction

[0062] The preparation steps of the composite magnetic powder and the corresponding magnetic core are: sieving powder A and powder B with a particle size of 8-200 μm; annealing according to their respective best soft magnetic properties; uniformly mixing the annealed powder A and powder B , to obtain composite magnetic powder; add a certain amount of binder, lubricant and insulating agent to the composite magnetic powder, after mixing, sequentially undergo pressing treatment, annealing treatment and painting treatment, and finally prepare various magnetic cores, such as magnetic powders of different shapes core, transformer, inductor and motor stator core, etc. After the composite magnetic powder is mixed with binder, lubricant and insulating agent, it is preferable to carry out proper drying. Proper drying ensures that the mixed powder has a certain fluidity, which is more conducive to molding.

[0063] The composite magnetic powder can also use 3D printing to manufacture and...

Embodiment 1

[0066] Embodiment 1 pure iron powder and Fe 78 Si 9 B 13 Amorphous alloy powder mixing

[0067] In this embodiment, pure iron powder (as powder A) is prepared by high-energy ball milling method, and Fe powder is prepared by water atomization method. 78 Si 9 B 13 Amorphous alloy (expressed in atomic percent, the same below) powder (as powder B). The two powders were annealed separately, and the annealing system of pure iron powder was 800℃×60min; Fe 78 Si 9 B 13 The annealing system of the alloy powder is 400℃×60min; a vacuum atmosphere is used in the annealing process. After sieving respectively, select pure iron powder with a particle size of 30-50 μm and Fe powder with a particle size of 20-40 μm 78 Si 9 B 13 Alloy powder, and uniformly mixed to prepare composite magnetic powder; according to the mass ratio, pure iron powder and Fe 78 Si 9 B 13 The mixing ratio of alloy powder is 50:50.

[0068] According to the following mass percentages, the composite magnet...

Embodiment 2

[0072] Embodiment 2 iron silicon powder and Fe 73.5 Cu 1 Nb 2 Cr 1 Si 15.5 B 7 Nanocrystalline Powder Mixing

[0073] In this example, high-energy ball milling is used to prepare iron-silicon powder, wherein the mass percentage of Si is 6.5% (as powder A), and Fe is prepared by water atomization. 73.5 Cu 1 Nb 2 Cr 1 Si 15.5 B 7 Nanocrystalline powder (expressed as atomic percent as powder B). The two kinds of powders were annealed respectively, among which, the annealing system of iron-silicon powder was 900℃×60min; the annealing system of nanocrystalline powder was 550℃×60min; hydrogen atmosphere was used in the annealing process. After sieving separately, select iron-silicon powder and nanocrystalline powder with a particle size of 30-50 μm, and mix them uniformly to prepare composite magnetic powder; according to the mass ratio, the mixing ratio of iron-silicon powder and nanocrystalline powder is 90:10.

[0074] The composite magnetic powder, insulating agent C...

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Abstract

The invention relates to high-saturation flux density composite magnetic powder. The high-saturation flux density composite magnetic powder is prepared from powder A and powder B, wherein the proportion is as follows: 5-95wt% of powder A and 5-95wt% of powder B, the powder A is at least one of iron silicon powder, pure iron powder, iron silicon aluminum power, iron nickel powder, iron nickel molybdenum powder and iron cobalt alloy powder, the powder B is at least one of iron-based amorphous alloy powder, iron-based nanocrystal alloy powder, iron-nickel-based amorphous alloy powder, iron-cobalt-based amorphous alloy powder and iron-cobalt-based nanocrystal alloy powder, and the grain sizes of the powder A and the powder B are 8-200 micrometers. A magnetic core prepared by employing the composite magnetic powder has the characteristics of high Bs, low loss, low cost and the like and is suitable for mass production, the Bs value is 1.71T or above, the loss is not higher than 50W/kg under 1.5T and 1,000Hz, and the magnetic core particularly and suitably works in a medium- and low-frequency range (50Hz-10kHz).

Description

technical field [0001] The invention relates to a metal magnetic powder and a device, in particular to a composite magnetic powder with high saturation magnetic induction, a magnetic core and a preparation method thereof, belonging to the technical field of functional materials. Background technique [0002] Iron-based amorphous and nanocrystalline alloys are used in power transmission and distribution, power electronics and other fields. They have a series of technical advantages such as high magnetic permeability, low loss, and low cost. "One of the energy-saving materials. However, compared with silicon steel, its saturation magnetic induction intensity, that is, Bs value ranges from 1.24-1.64T, which is lower than 2.05T of silicon steel, so when used under power frequency, the output power density per unit volume is still low. [0003] Chinese patent 2005101332500.1 discloses a composite powder for magnetic powder core and a preparation method thereof, wherein powder A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/153H01F27/255H01F41/02B22F1/00
CPCH01F1/14791H01F1/15316H01F27/255H01F41/0246B22F1/103B22F1/105B22F1/142B22F1/10
Inventor 董帮少周少雄张广强李宗臻高慧李颖
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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