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Carbon wave-absorbing material and preparation method thereof

A technology of wave absorbing material and carbon, which is applied in the field of wave absorbing material to achieve the effect of easy realization, improved wave absorbing performance and good wave absorbing performance

Active Publication Date: 2020-07-31
THE SECOND AFFILIATED HOSPITAL TO NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Judging from the current development of wave-absorbing materials, it is difficult for one type of material to meet the "thin, light, wide, Strong” comprehensive requirements, the main coverage of dielectric absorbing materials and magnetic absorbing materials are in the low-end and high-end of the centimeter wave band, so it is necessary to combine various absorbing materials in various forms to obtain the best stealth effect , to improve the absorbing performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Grind medium-temperature asphalt with a softening point of about 90°C into powder, add polyferric chloride colloid with 5% of the asphalt mass for stirring and mixing, and heat the mixed asphalt powder to about 180°C to completely melt into a liquid state, and melt while melting Stir, keep warm for more than two hours, and obtain modulated asphalt after cooling;

[0022] 2) Heat the modulated asphalt obtained in step 1) to 500-600°C under air-isolated conditions, carry out coking reaction, completely remove volatile matter to obtain coke, and grind the coke to obtain carbon powder, which is doped with chlorine Iron; in the asphalt coking process, the asphalt first melts into a liquid state, and the liquid asphalt phase will preferentially form aggregates with solid polyferric chloride as the core, and gradually remove volatiles to form polyferric chloride as the core. of coke.

[0023] 3) The carbon powder obtained in step 2) is impregnated with excess sodium hydrox...

Embodiment 2

[0025] 1) Grind medium temperature asphalt into powder, add polyferric chloride colloid with 8% of the asphalt mass for stirring and mixing, heat and melt for further stirring and mixing, and obtain modulated asphalt after cooling;

[0026] 2) Heating the modulated asphalt obtained in step 1) to 500-600°C under air-isolated conditions, removing volatile matter to obtain coke, and grinding the coke to obtain carbon powder;

[0027] 3) The carbon powder obtained in step 2) is impregnated with excess sodium hydroxide solution and boiled. After washing, it is dried, and heated under air-isolated conditions. The heating temperature is 300-500 ° C. After cooling, carbon absorbing Material.

Embodiment 3

[0029] 1) Grind medium-temperature asphalt into powder, add polyferric chloride colloid with 10% of the asphalt mass for stirring and mixing, heat and melt for further stirring and mixing, and obtain modulated asphalt after cooling;

[0030] 2) Heating the modulated asphalt obtained in step 1) to 500-600°C under air-isolated conditions, removing volatile matter to obtain coke, and grinding the coke to obtain carbon powder;

[0031] 3) The carbon powder obtained in step 2) is impregnated with excess sodium hydroxide solution and boiled. After washing, it is dried, and heated under air-isolated conditions. The heating temperature is 300-500 ° C. After cooling, carbon absorbing Material.

[0032] The carbon absorbing material in Example 2 is mixed with paraffin at a ratio of 1:1, pressed into a 2mm sheet, and the electromagnetic parameters are measured. The test frequency is 1-18GHz. The effective bandwidth with reflectivity less than -10dB reaches 12GHz, and there are two absor...

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PUM

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Abstract

The invention relates to a carbon wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps 1) grinding medium-temperature asphalt into powder, adding polyferric chloride colloid, stirring and mixing, further stirring and mixing after heating melting, and cooling to obtain modulated asphalt; 2) heating the modulated asphalt obtained in the step1) to 500-600 DEG C under the condition of air isolation, removing volatile components to obtain a coking material, and grinding the coking material to obtain carbon powder; and 3) impregnating the carbon powder obtained in the step 2) with an excessive amount of a sodium hydroxide solution, boiling, washing, drying, heating at 300-500 DEG C under the condition of air isolation, and cooling to obtain the carbon wave-absorbing material. According to the carbon wave-absorbing material prepared by the invention, ferrite is used as an inner core, and a carbonaceous shell formed after asphalt is coked covers the ferrite. The carbon wave-absorbing material has good wave-absorbing performance and has absorption peaks in different frequency bands.

Description

technical field [0001] The invention relates to a carbon absorbing material and a preparation method thereof, belonging to the technical field of absorbing materials. Background technique [0002] Wave-absorbing materials are widely used in the military field, and have become the key to the research of military equipment stealth technology in various countries; and with the development of the electronics industry, the harm of electromagnetic radiation is becoming more and more serious. The fourth pollution source after that has caused serious harm to the ecological environment and human health. The use of wave-absorbing materials is an effective way to solve the harm of electromagnetic pollution. Therefore, the study of absorbing materials is of great significance. The ideal absorbing material should have the characteristics of strong absorption, wide frequency band, thin thickness and light weight. In order to better meet these requirements, the preparation of new absorbin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00H01Q17/00
CPCC09K3/00H05K9/0081H01Q17/00
Inventor 武艳丽聂智良
Owner THE SECOND AFFILIATED HOSPITAL TO NANCHANG UNIV