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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 difficulty in meeting the electromagnetic performance requirements of integrally formed inductors, current breakdown resistance, and poor performance, and achieve high saturation magnetic flux density, strong breakdown resistance, Excellent molding performance

Active Publication Date: 2019-03-29
DONGGUAN MENTECH OPTICAL & MAGNETIC CO LTD
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  • Summary
  • 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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  • Magnetic powder core and preparation method thereof
  • Magnetic powder core and preparation method thereof
  • Magnetic powder core and preparation method thereof

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preparation example Construction

[0028] The invention provides a method for preparing a magnetic powder core, comprising:

[0029] A) mixing the carbonyl iron powder with the phosphating solution, and performing phosphating treatment to obtain the treated iron powder;

[0030] 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;

[0031] C) The coated powder is granulated, pressed and molded, and solidified to obtain a magnetic powder core.

[0032] 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.

[0033] 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

[0057] A method for preparing a magnetic powder core for an integrated molded inductor with resistance to current breakdown, comprising the following steps:

[0058] (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.

[0059] (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.

[0060] (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

[0064] A method for preparing a magnetic powder core for an integrated molded inductor with resistance to current breakdown, comprising the following steps:

[0065] (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.

[0066] (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.

[0067] (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 preparation method of magnetic powder cores. The preparation method comprises the steps: mixing carbonyl iron powder with a phosphating solution, and phosphating to obtain iron powder after treatment; drying the iron powder after treatment, sieving and then mixing and coating with an insulating coating agent to obtain powder after coating, wherein the insulating coating agent comprises organic resin, inorganic coating material, coupling agent and curing agent; and granulating, pressing and solidifying the coated powder to obtain a magnetic powder core. The preparationmethod of magnetic powder cores achieves the best performance of the magnetic powder core by selecting a specific insulating coating agent, and combines the remaining operations, thus having the magnetic properties such as higher saturation magnetic flux density and stable magnetic permeability, and having strong resistance to breakdown. The preparation method of magnetic powder cores is excellentin molding performance, can meet molding of the complex structure of one-piece inductors, and can satisfy the industrial requirement for mechanical properties. The preparation method of magnetic powder cores enables the insulating coating of the magnetic powder core to be more stable by combination of multi-element coatings, so that the prepared product has stronger working stability during the service life of the product.

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 Applications(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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