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Aliminium base wave absorbing material and preparing method

An absorbing material, aluminum-based technology, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problems of narrow absorbing frequency range of conductive polymer, not wide enough absorbing frequency band, large proportion of absorbing material, etc. High-efficiency broadband absorbing performance, improving absorbing effect, good effect

Inactive Publication Date: 2006-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many types of wave-absorbing materials, such as conductive polymers, ferrites, conductive magnetic fibers, etc., but a series of problems will be encountered in practical applications, such as ferrite wave-absorbing materials have a large specificity and the wave-absorbing frequency band is not wide enough ; Conductive magnetic fibers are easy to entangle to form a conductive network path, which produces shielding reflections on electromagnetic waves, restricting the absorbing effect, and the actual coating application is extremely difficult; the range of the absorbing frequency of conductive polymers is narrow, and there is no matching binder, which is still in the research stage

Method used

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  • Aliminium base wave absorbing material and preparing method

Examples

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Embodiment 1

[0020] ① Anneal the aluminum plate at 500°C, take it out, wash it several times with acetone and sodium hydroxide to remove the oil and the oxide film on the surface, and then wash it in perchloric acid (HClO 4 ) in ethanol solution to brighten.

[0021] ②A two-step AC anodization was carried out in 4wt% oxalic acid solution: first, the first step of anodization was carried out, the temperature of the solution was controlled at 20-35°C, the time was 1h, the voltage was gradually increased from 20V to 40V, and then the sample was placed at 6 % phosphoric acid, 1.8% H 2 CrO 4 solution, until the AAO film formed on the substrate aluminum was completely etched away, the sample was taken out and cleaned, and then the sample was subjected to the second anodic oxidation under the same conditions for 1 hour, taken out, air-dried, and stored in vacuum.

[0022] ③ Soak the two-step anodized sample in 1M oxalic acid at 30°C to adjust the dense barrier layer of the aluminum-based AAO fi...

Embodiment 2

[0028] ① Anneal the aluminum plate at 500°C, take it out, wash it several times with acetone and sodium hydroxide to remove the oil and the oxide film on the surface, and then wash it in perchloric acid (HClO 4 ) in ethanol solution to brighten.

[0029] ②A two-step AC anodizing method was used in 4wt% oxalic acid solution: the solution temperature was controlled at 20-35°C, and one-step anodizing was performed first for 1 hour, and the voltage was gradually increased from 20V to 40V. The one-step anodized samples were placed in 6% phosphoric acid, 1.8% H 2 CrO 4 solution, until the AAO film formed on the substrate aluminum was completely etched away, the sample was taken out and cleaned, and then the sample was subjected to the second step of anodizing under the same conditions for 1 hour, taken out, air-dried, and stored in vacuum.

[0030] ③ Soak the two-step anodized sample in 1M oxalic acid at 30°C to adjust the dense barrier layer of the aluminum-based AAO film to an a...

Embodiment 3

[0036] ①Immerse the aluminum plate in acetone for a day and night to remove oil, perform mechanical polishing, and then wash it in perchloric acid (HClO) 4 ) in ethanol solution to brighten.

[0037] ② Direct current anodic oxidation in 12wt% sulfuric acid solution by one-step method. The voltage is controlled at about 20V, the solution temperature is controlled at 0-10°C, and the time is 5-10h. The samples are taken out, cleaned, air-dried, and stored in vacuum.

[0038] ③ Soak the anodized sample in 0.3M phosphoric acid at 30°C to adjust the dense barrier layer of the aluminum-based AAO film to an appropriate thickness.

[0039] ④ Electrodeposition of iron nanowires: the anodized aluminum-based alumina template is charged into the cell, at 100g / L FeSO 4 , 15g / L (NH) 2 SO 4 , 30g / L MgSO 4 , 1g / L ascorbic acid, 2ml / L glycerol electrolyte at room temperature for direct current electrodeposition, the time is 4-6h, the voltage is controlled at 8-15V. The resulting sample wa...

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Abstract

The present invention belongs to the field of aluminum-base material in metallurgical technology, and is especially aluminum-base wave absorbing material and its preparation process. The present invention features that aluminum or aluminum alloy plate is treated first through one-step or two-step DC or AC anode oxidation process to form aluminum-base porous alumina template, or AAO template, with porous alumina film in the surface; and the template is then DC or pulse current electrochemically deposited to assemble nanometer magnetic metal wire array in the AAO porous film, so as to make the aluminum-base wave absorbing material with in-situ assembled nanometer magnetic metal wire array in the surface. The present invention has close combination between the wave absorbing material and the substrate and high wave absorbing effect caused by the coupling effect and the size effect of the nanometer wire array. The present invention may be used widely in stealth and electromagnetic shield.

Description

Technical field: [0001] The invention belongs to an aluminum-based material in the field of metallurgy, in particular to an aluminum-based wave-absorbing material and a preparation method thereof. Background technique: [0002] At present, there are many types of wave-absorbing materials, such as conductive polymers, ferrites, conductive magnetic fibers, etc., but a series of problems will be encountered in practical applications, such as ferrite wave-absorbing materials have a large specificity and the wave-absorbing frequency band is not wide enough ; Conductive magnetic fibers are easy to entangle to form a conductive network path, which produces shielding reflections on electromagnetic waves, restricting the absorbing effect, and the actual coating application is extremely difficult; the range of the absorbing frequency of conductive polymers is narrow, and there is no matching binder, which is still in the research stage. Invention content: [0003] The purpose of th...

Claims

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Application Information

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IPC IPC(8): C25D11/20H05K9/00
Inventor 陈康华黄兰萍李金儡彭伟才
Owner CENT SOUTH UNIV
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