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Carbon-based composite microwave absorbent and preparation method thereof

A wave absorbing agent, carbon-based technology, applied in the field of functional carbon-based composite material preparation, can solve problems such as low efficiency and insignificant effect of chemical plating, etc.

Active Publication Date: 2019-01-18
NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a carbon-based composite wave absorbing agent and its preparation method, which solves the problems of low efficiency and insignificant effect of traditional internal filling, external coating and other electroplating and chemical plating, etc., In situ preparation of carbon-based composite microwave absorbers by one-step method

Method used

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  • Carbon-based composite microwave absorbent and preparation method thereof

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Embodiment 1

[0028] A preparation method of carbon-based composite wave-absorbing agent, comprising the following steps:

[0029] S1. Select a precursor, pre-mix the precursor, and prepare a liquid mixture of the precursor;

[0030] S2. Take the liquid precursor mixture in S1 and place it in a stainless steel airtight reaction vessel;

[0031] S3, placing the stainless steel airtight reaction vessel in the resistance furnace cavity, and introducing an inert protective gas;

[0032] S4. Evenly heat up to 700-750° C., keep warm for a period of time, and then cool to room temperature to obtain a carbon-based composite wave absorbing agent.

[0033] In an embodiment, the precursor is a precursor compound or an organometallic compound containing carbon and ferromagnetic material elements, so that the precursor is pre-mixed according to a specific design of element composition ratio.

[0034] In an embodiment, the ferromagnetic material elements include iron, cobalt, and nickel.

[0035] In a...

Embodiment 2

[0044] S1. Select ferrocene and tetrahydrofuran as precursors, weigh 5.0-10.0g ferrocene, measure 10-20ml tetrahydrofuran, put it in a beaker with a volume of 50ml, and place the beaker on a magnetic stirrer for magnetic stirring Mix without heating, gradually increase the stirring speed from low speed, keep stirring at medium speed, and stir for 5-10 minutes, wait for the ferrocene to dissolve evenly, stop stirring, and prepare the precursor liquid mixture;

[0045] S2. Use a pipette to transfer the precursor liquid mixture in S1 to a stainless steel closed reactor, the transfer volume is 10-15ml, not exceeding 2 / 3 volume of the stainless steel closed reactor;

[0046] S3. Tighten the stainless steel airtight reaction vessel containing the precursor mixture in S2 with a vise, place the tightened stainless steel airtight reaction vessel in the tubular resistance furnace chamber, and inject inert gas nitrogen for 50-70min. The flow rate is 150-200sccm to remove the air in the f...

Embodiment 3

[0049] S1. Select ferrocene, petroleum ether, and absolute ethanol as precursors, weigh 5.0-10.0g ferrocene, measure 5-10ml petroleum ether, measure 5-10ml absolute ethanol, put petroleum ether in 50ml In a beaker, dissolve ferrocene in petroleum ether and use a glass rod to initially stir and mix, and then use a magnetic stirrer for magnetic stirring and mixing. After the solid particles disappear, transfer it to absolute ethanol, and then perform magnetic stirring. The stirring time 10-15min to prepare the precursor liquid mixture;

[0050]S2. Use a glass rod to drain the precursor liquid mixture in S1 into a closed stainless steel reactor, with a transfer volume of 10-15ml, not exceeding 2 / 3 of the volume of the closed stainless steel reactor;

[0051] S3. Tighten the stainless steel airtight reaction vessel containing the precursor mixture in S2 with a vise, place the tightened stainless steel airtight reaction vessel in the tubular resistance furnace chamber, and inject i...

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Abstract

The invention relates to the technical field of preparation of functional carbon-based composite materials, in particular to a carbon-based composite microwave absorbent and a preparation method thereof. By utilizing a technology of a high-temperature self-generated pressure method, taking a carbon-based material precursor as a main raw material, simultaneously introducing a precursor compound containing elements such as iron, cobalt and nickel, through pre-treatment, by virtue of a method of generating pressure by high-temperature decomposition in a sealed container, namely in a high-temperature self-generated pressure environment, carbon and a ferromagnetic element are rearranged and combined to form a novel compound, and a carbon-based composite material is formed by in-situ preparation. A composite process of surface plating by electroless plating and internal filling of a carbon material is fundamentally achieved, the preparation of a composite material with both electrical loss and magnetic loss is completed, a series of complicated processes such as purification, sensitization, preparation of a plating solution, an electroless plating process and post-treatment for the previously obtained carbon material are avoided, simultaneously the preparation efficiency of composite powder electromagnetic wave absorbing materials is greatly improved, and the optimization of both electrical loss and magnetic loss properties is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of functional carbon-based composite materials, and more specifically, to a carbon-based composite wave absorbing agent and a preparation method thereof. Background technique [0002] With the rapid development of information technology and electronic technology, the electromagnetic factors in our living environment are becoming more and more complex, and the resulting electromagnetic radiation is becoming more and more serious. Simultaneously, also brought certain harm to people. As one of the effective protective measures against the hazards of electromagnetic radiation, electromagnetic protective materials are playing an increasingly important role. [0003] Traditional electromagnetic protection materials mainly rely on the principle of electromagnetic shielding of ideal conductors, the electrical loss of conductive materials to electromagnetic waves, and the magnetic loss characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 李克训马江将张捷贾琨王东红刘伟郭峰谷建宇
Owner NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP