A kind of magnetic powder core and preparation method thereof

A magnetic powder core and iron powder technology, applied in the field of materials, can solve the problems of difficult to meet the electromagnetic performance requirements of integrally formed inductors, resistance to current breakdown, poor performance, etc., to achieve high saturation magnetic flux density, strong breakdown resistance, Excellent formability effect

Active Publication Date: 2022-01-07
DONGGUAN MENTECH OPTICAL & MAGNETIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the coating agent disclosed in the above-mentioned prior art is relatively single, resulting in poor performance such as resistance to current breakdown, and it is difficult to meet the complex and diverse electromagnetic performance requirements of integrally formed inductors.

Method used

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  • A kind of magnetic powder core and preparation method thereof
  • A kind of magnetic powder core and preparation method thereof
  • A kind of magnetic powder core and preparation method thereof

Examples

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preparation example Construction

[0027] The invention provides a method for preparing a magnetic powder core, comprising:

[0028] A) mixing the carbonyl iron powder with the phosphating solution, and performing phosphating treatment to obtain the treated iron powder;

[0029] B) drying and sieving the treated iron powder, mixing and coating with an insulating coating agent to obtain a coated powder; the insulating coating agent includes an organic resin, an inorganic coating material, a coupling agent and a curing agent;

[0030] C) The coated powder is granulated, pressed and molded, and solidified to obtain a magnetic powder core.

[0031] The invention provides a preparation method of a magnetic powder core. Firstly, carbonyl iron powder is mixed with a phosphating solution and subjected to phosphating treatment to obtain the treated iron powder.

[0032] The carbonyl iron powder in the present invention preferably has a particle size of 1-20 μm and a purity of 99.9% or more; the present invention does n...

Embodiment 1

[0056] A method for preparing a magnetic powder core for an integrated molded inductor with resistance to current breakdown, comprising the following steps:

[0057] (1) Phosphating treatment: weigh 500g of carbonyl iron powder. Then prepare phosphating solution: weigh 5g of phosphoric acid, add 100g of acetone to dilute, stir and disperse evenly. Slowly add carbonyl iron powder into the phosphating solution, continue to stir for 30 minutes, and then wash the powder with acetone.

[0058] (2) Drying and sieving: dry the phosphating powder and put it in a blast drying oven, bake it at 120°C for 1.5h, then sieve the powder with a 180-mesh sieve, and take the obtained powder.

[0059] (3) Insulation coating: weigh 100 g of phosphated carbonyl iron powder. Prepare insulating coating agent: weigh 2g polyester modified silicone resin, 1g bisphenol A epoxy resin, 0.8g KH550 coupling agent, 0.3g maleic anhydride, 0.5g nano-SiO 2 , add 15g of acetone as a solvent, fully stir and di...

Embodiment 2

[0063] A method for preparing a magnetic powder core for an integrated molded inductor with resistance to current breakdown, comprising the following steps:

[0064] (1) Phosphating treatment: weigh 500g of carbonyl iron powder. Then prepare the phosphating solution: weigh 10g of aluminum dihydrogen phosphate, add 80g of alcohol to dilute, stir and disperse evenly. Slowly add carbonyl iron powder into the phosphating solution, continue to stir for 50 minutes, and then wash the powder with alcohol.

[0065] (2) Drying and sieving: dry the phosphating powder and put it in a blast drying oven, bake it at 100°C for 1 hour, then sieve the powder with a 160-mesh sieve, and take the fine powder obtained by sieving. pink.

[0066] (3) Insulation coating: weigh 100 g of phosphated carbonyl iron powder. Prepare insulating coating agent: weigh 3g epoxy modified silicone resin, 0.5g bisphenol A epoxy resin, 0.5g alicyclic epoxy resin, 0.5g KH550 coupling agent, 0.3g maleic anhydride, ...

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Abstract

The invention provides a method for preparing a magnetic powder core, comprising: mixing carbonyl iron powder with a phosphating solution, and performing phosphating treatment to obtain treated iron powder; drying and sieving the treated iron powder and mixing with an insulating coating agent coating to obtain coated powder; the insulating coating agent includes organic resin, inorganic coating material, coupling agent and curing agent; the coated powder is granulated, pressed and solidified to obtain a magnetic powder core. In the present invention, by selecting a specific insulating coating agent and combining other operations, the magnetic powder core achieves the best comprehensive performance, which not only has high saturation magnetic flux density and stable magnetic permeability and other magnetic performance indicators, but also has breakdown resistance. Strong ability; and excellent molding performance, which meets the molding of complex structure of integrated inductor; mechanical properties can also meet industrial requirements. The present invention makes the insulating coating layer of the magnetic powder core more stable through multi-layer coating combination, and can make the working stability of the manufactured product stronger during the service life.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a magnetic powder core and a preparation method thereof. Background technique [0002] With the development of the electronics industry, electronic products have begun to show the development trend of "four modernizations", that is, miniaturization, integration, multi-function, and high power. In order to comply with the trend of high-performance electronic products, the emerging integrated inductors with small size, high power, low cost and suitable for integrated installation have put forward more requirements on the electromagnetic properties of soft magnetic materials. It is required to have stable magnetic permeability when used at different frequencies, and it needs to maintain low loss. At the same time, it has high resistivity and excellent insulation breakdown resistance to ensure the stability of working life. [0003] Traditional soft magnetic materials mainly inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/02
CPCH01F41/0246B22F3/02
Inventor 王艳红刘树林马宗俊陈榕寅
Owner DONGGUAN MENTECH OPTICAL & MAGNETIC CO LTD
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