A magnetic hole substrate for preparing sheet-shaped electromagnetic noise suppression material

A magnetic hole and electromagnetic noise technology, applied in the field of electronics, can solve the problems of reducing material permeability, limiting noise suppression performance, reducing ferromagnetic coupling, etc., to increase eddy current loss, improve electromagnetic noise suppression performance, and enhance magnetic The effect of conductivity

Inactive Publication Date: 2017-09-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the hole templates used in electromagnetic noise suppression materials, such as polycarbonate templates and alumina templates, are non-magnetic templates, the ferromagnetic coupling between the magnetic nanowires plated in the holes is reduced, reducing the material's magnetic permeability, which limits the improvement of its noise suppression performance

Method used

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  • A magnetic hole substrate for preparing sheet-shaped electromagnetic noise suppression material
  • A magnetic hole substrate for preparing sheet-shaped electromagnetic noise suppression material
  • A magnetic hole substrate for preparing sheet-shaped electromagnetic noise suppression material

Examples

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preparation example Construction

[0020] A method for preparing a magnetic hole substrate for preparing a sheet-shaped electromagnetic noise suppression material, the process flow is as follows figure 1 As shown, it specifically includes the following steps:

[0021] Step 1: Ultrasonic cleaning of iron sheets with a thickness of 0.2mm and a purity of 99.9% in acetone, ethanol and deionized water for 10 minutes respectively, and dried naturally;

[0022] Step 2: The iron sheet cleaned in step 1 is anodized by a two-electrode method under constant voltage conditions, and holes are formed on the surface of the iron sheet to form amorphous ferric oxide; the electrolyte used in the anodic oxidation is: the purity is A mixture of 99.5% ethylene glycol solution, ammonium fluoride with a purity of 96% and deionized water with a resistivity greater than 18.2MΩ.cm; the preparation method of the electrolyte is: in ethylene glycol solution (99.5% purity) Add successively the ammonium fluoride (96% purity) that is equival...

Embodiment 1

[0027] A method for preparing a magnetic hole substrate for a sheet-shaped electromagnetic noise suppression material, specifically comprising the following steps:

[0028] Step 1: ultrasonically clean the iron sheet with a thickness of 0.2mm and a purity of 99.9% in acetone, absolute ethanol and deionized water for 10 minutes respectively, take it out and dry it naturally;

[0029]Step 2: In ethylene glycol (99.5% purity), sequentially add 0.5wt% ammonium fluoride (96% purity) equivalent to ethylene glycol mass and a resistivity greater than 18.2MΩ equivalent to 3wt% ethylene glycol mass .cm of deionized water, mixed evenly, to prepare an anodic oxidation electrolyte;

[0030] Step 3: Add 0.3 mol of glucose to 100 mL of ethanol aqueous solution (80 mL of deionized water mixed with 20 mL of ethanol) to prepare a carbon coating solution;

[0031] Step 4: The iron sheet cleaned in step 1 is anodized under constant voltage conditions using the two-electrode method: the iron shee...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is that the oxidation voltage in step 4 is 30V, and the rest of the steps are the same as in embodiment 1.

[0039] After testing, the pore diameter of the holes on the surface of the magnetic hole substrate obtained in Example 2 is about 50 nm.

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Abstract

The invention provides a magnetic hole substrate for preparing a sheet-shaped electromagnetic noise suppression material and a preparation method thereof. The magnetic hole substrate includes an iron substrate and a porous layer on the iron substrate, and the porous layer is a nanoscale hole. The carbon-coated ferroferric oxide has a pore size of 50-150nm, and ferromagnetic nanowires can be deposited in the holes by an electroplating process as a sheet-shaped electromagnetic noise suppression material. The preparation method is as follows: first, the clean iron sheet is anodized, then soaked in glucose ethanol solution for 8-12 hours, dried, and finally annealed at 400-600 DEG C for 2-4 hours in an argon atmosphere. The present invention adopts magnetic material as hole substrate material, which enhances the ferromagnetic coupling effect between the magnetic nanowires deposited in the holes, has good noise absorption performance, and the absorption frequency can reach above 10 GHz; and it is easy to realize miniaturization and integration It can meet the demand for electromagnetic noise suppression in high frequency and wide frequency range.

Description

technical field [0001] The invention belongs to the field of electronic technology, relates to high-frequency electromagnetic compatibility technology, in particular to a substrate for preparing a sheet-shaped material for suppressing transmission line electromagnetic noise and a preparation method thereof. Background technique [0002] With the wide application of high-frequency electronic devices in daily life and industry and the rapid development of highly integrated large-scale integrated circuits, electromagnetic noise interference between circuit systems and electronic devices has become an increasingly serious problem. Practice has shown that the electromagnetic noise emitted by the transmission line can be well suppressed by using the energy loss generated by the magnetic material. In the frequency band that basically covers the signal frequency range of the transmission line, when no magnetic material is used, the noise harmonics in the signal will have little atte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/34H05K9/00
Inventor 钟智勇张怀武廖宇龙唐晓莉苏桦文天龙白飞明金立川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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