Preparation method of nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material

A nitrogen-doped porous carbon and composite wave absorbing material technology, applied in the field of wave absorbing materials, can solve the problems of complex preparation method, high cost and high equipment requirements, and achieve the effects of simple preparation process, low production cost and stable material performance.

Active Publication Date: 2022-07-01
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] The present invention aims to solve the technical problems of complex preparation methods, high equipment requirements and high cost in existing carbon-based microwave absorbing materials, and provides a method for preparing a composite wave-absorbing material of nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy

Method used

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  • Preparation method of nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material
  • Preparation method of nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material
  • Preparation method of nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material

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Embodiment 1

[0022] Using CoNi@PDA as a template, the method for preparing CoNi@NC composite absorbing material is as follows:

[0023] Step 1: Add 0.48g of CoCl 2 ·6H 2 O, 0.48g of NiCl 2 ·6H 2 O and 1 g of polyvinylpyrrolidone (PVP) were dissolved together in 36 mL of ethylene glycol, stirring was continued for 30 min, and then 6 mL of 60% hydrazine hydrate solution was sequentially dropped into the above solution under strong stirring and stirred for 20 min. The resulting suspension was transferred to a tetrafluoroethylene-lined stainless steel reactor and kept in an air oven at 180° C. for 6 h. After the reaction, the obtained products were collected and washed with deionized water and ethanol at least three times respectively to remove residual impurities; finally, they were placed in a vacuum oven and dried under vacuum at 60 °C for 8 h to obtain hollow CoNi alloy microstructures. ball.

[0024] Step 2: Disperse 0.2 g of CoNi alloy microspheres and 0.24 g of dopamine hydrochlori...

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Abstract

The preparation method of the nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material of the present invention uses CoNi@polydopamine as a template, in-situ polymerization of dopamine hydrochloride on the hollow CoNi alloy, and then calcined at high temperature to form a nitrogen-doped porous carbon shell Coated hollow CoNi alloy composite absorbing material. The composite absorbing material exhibits excellent microwave absorption performance at a relatively thin thickness. At a frequency of 12.8 GHz, the matching thickness is 2.0 mm, the optimal RL value can reach ‑47.1 dB, the frequency bandwidth is 4.52 GHz, and the absorbing performance is excellent. It has high application value. The preparation process of the invention is simple, the compounding is uniform, the material properties are stable, and the production cost is low, and the invention is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped porous carbon-coated hollow cobalt-nickel alloy composite wave absorbing material, and specifically belongs to the technical field of wave absorbing materials. Background technique [0002] Due to the rapid development of electronic technology, electromagnetic wave interference is ubiquitous in our daily life, which not only seriously threatens human health, but also affects the operation of precision electronic instruments. In addition, it is also important for military equipment to absorb radar waves for stealth purposes. Therefore, it is crucial to develop advanced microwave absorbing materials with "strong, wide, thin, and light" functions for perfect functionality. Magnetic materials (alloys) have attracted much attention due to their high saturation magnetization, simple preparation methods and low cost. Nonetheless, these magnetic materials usually result in impedance mismatch a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/16C01B32/05H05K9/00H01Q17/00
CPCB22F9/24C01B32/05H05K9/0081H01Q17/00B22F1/0655B22F1/16
Inventor 熊志强沈仲景刘崇波万进雄龙朝剑
Owner NANCHANG HANGKONG UNIVERSITY
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