Carbonyl iron powder core with magnetic conductivity of 35

A technology of carbonyl iron powder and carbonyl iron, which is applied in the field of materials, can solve problems such as burn-in and inability to use, and achieve the effect of reduced loss and good surface coating effect

Inactive Publication Date: 2020-08-11
东莞市铭燕电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem that the existing carbonyl iron powder core with a magnetic permeability of 35 cannot be used at a higher temperature and may burn out due to aging during long-term use.

Method used

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  • Carbonyl iron powder core with magnetic conductivity of 35

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Select carbonyl iron powder with a purity of more than 97.5% as the raw material iron powder, the particle size is: D10=1.5~3.5 microns, D50=3.0~5.5 microns, D90=6.0~9.5 microns, with phosphoric acid alcohol solution, the concentration is 2wt%, Potassium dichromate aqueous solution, the concentration is 6wt%.

[0031] Mix and stir potassium dichromate aqueous solution and carbonyl iron powder, at the same time slowly add phosphoric acid alcohol solution to it, stirring time is 1 hour, stir at 70 degrees Celsius until the powder is dry, and then bake at 150 degrees Celsius for 90 minutes. The ratio of potassium dichromate aqueous solution to carbonyl iron powder is 5%. The ratio of phosphoric acid alcohol solution to carbonyl iron powder is 15%.

[0032] Add the mica powder into the alcohol liquid, mix well to form a uniform suspension liquid, then add the mixed liquid to the dried powder in the previous step, and stir until the powder is dry. The weight ratio of mica ...

Embodiment 2

[0037] The difference between this example and Example 1 is that the mica powder is replaced by kaolin and diatomite, the weight ratio of kaolin to carbonyl iron powder is 0.6%, and the weight ratio of diatomite to carbonyl iron powder is 0.6%. Use silica sol instead of silica-alumina sol, and add silica sol to carbonyl iron powder at a ratio of 4%. Add 0.3% lithium stearate as lubricant.

[0038] at 10 / cm 2 Under high pressure, it is pressed into iron powder core. The heat treatment condition is nitrogen, the heat treatment temperature is 500 degrees centigrade, and the time is 60 minutes.

[0039] Use HP4284A to test inductance, Q value, test condition 100kHz1V, N=20 turns, inductance is 19.4uH, Q=206, loss 963mW / cm 3 (50kHz / 100mT). After placing the iron powder core at 180 degrees Celsius for 8760 hours, the inductance of the iron powder core is 19.6uH, the Q value is 207, and the loss is 947 mW / cm 3 (50kHz / 100mT).

Embodiment 3

[0041] The difference between this example and Example 1 is that mica powder is replaced by diatomite, and the weight ratio of diatomite to carbonyl iron powder is 0.9%. Use silica sol instead of silica-alumina sol, and add silica sol to carbonyl iron powder at a weight ratio of 5%. Add 0.3% lithium stearate as lubricant.

[0042] at 12 / cm 2Under high pressure, it is pressed into iron powder core. The heat treatment condition is nitrogen, the heat treatment temperature is 600 degrees centigrade, and the time is 60 minutes.

[0043] Use HP4284A to test inductance, Q value, test condition 100kHz 1V, N=20 turns, inductance is 19.2uH, Q=201, loss 910mW / cm 3 (50kHz / 100mT). After placing the iron powder core at 180 degrees Celsius for 8760 hours, the inductance of the iron powder core is 19.5uH, the Q value is 195, and the loss is 923 mW / cm 3 (50kHz / 100mT).

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Abstract

The invention discloses a carbonyl iron powder core with the magnetic conductivity of 35. The iron powder core raw material contains carbonyl iron, chromate, phosphoric acid, a component A, a component B and a lubricating agent. According to the carbonyl iron powder core with the magnetic conductivity of 35 obtained by using the technical scheme, the performance of the carbonyl iron powder core with the magnetic conductivity of 35 is kept basically unchanged under the condition of 180 DEG C for 8760 hours, and no obvious thermal aging phenomenon occurs. The loss of the iron powder core is reduced by 30%-50% compared with similar iron powder cores on the market at present.

Description

technical field [0001] The invention relates to the field of materials, in particular to a carbonyl iron powder core with a magnetic permeability of 35. Background technique [0002] With the development of modern electronic information industry technology, the application market scale of iron powder core is gradually increasing, and it is mainly used in electrical circuits to solve electromagnetic compatibility (EMC) problems. In actual application, various other substances will be added according to different filtering requirements in different bands. Iron powder core is a relatively common soft magnetic material, and it is also one of the materials with relatively low market prices. This material is composed of carbon-based ferromagnetic powder and resin carbon-based ferromagnetic powder. Due to its low price, iron powder cores are still the most used magnetic powder cores. The magnetic permeability is between 10 and 100. Magnetic permeability 35 carbonyl iron powder co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/42H01F41/02C04B28/24C04B28/00C04B41/60
CPCC04B28/005C04B28/24C04B41/0072C04B41/009C04B41/60C04B2111/00422H01F1/42H01F41/0246C04B14/36C04B22/087C04B22/165C04B14/20C04B22/06C04B24/085C04B14/106C04B14/08
Inventor 孙长青陈丽莉孟苏衡李双良卢燕
Owner 东莞市铭燕电子有限公司
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