SiC-ferrite/carbon material high-temperature wave absorption composite material and preparation method thereof

A carbonaceous material and composite material technology, applied in electrical components, antennas and other directions, can solve the problems of complex processing of absorbing materials, poor absorbing effect and high cost, achieve high yield, improve absorbing performance, and avoid graphitization Effect

Active Publication Date: 2019-02-15
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of complex processing, high cost and poor absorbing effect of existing wave absorbing materials, and provides a SiC-ferrite / carbonaceous material high temperature wave absorbing composite material and its preparation method

Method used

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  • SiC-ferrite/carbon material high-temperature wave absorption composite material and preparation method thereof
  • SiC-ferrite/carbon material high-temperature wave absorption composite material and preparation method thereof
  • SiC-ferrite/carbon material high-temperature wave absorption composite material and preparation method thereof

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specific Embodiment approach 1

[0025] Embodiment 1: The SiC-ferrite / carbonaceous material high-temperature wave-absorbing composite material of this embodiment is composed of ferrite, silicon carbide and carbonaceous materials, wherein the carbonaceous materials are graphene, reduced graphene, oxide Graphene, conductive carbon black or carbon nanotubes; carbonaceous materials are graphene, reduced graphene or graphene oxide, ferrite and silicon carbide are supported on graphene sheets; carbonaceous materials are conductive carbon black, conductive carbon Black is evenly mixed with ferrite and silicon carbide; the carbonaceous material is carbon nanotubes, and ferrite, silicon carbide and carbon nanotubes are evenly mixed.

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment is different from Embodiment 1 in that the ferrite is nickel oxide, iron oxide or cobalt oxide. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the preparation method of the SiC-ferrite / carbonaceous material high-temperature wave-absorbing composite material described in specific embodiment one is carried out according to the following steps:

[0028] 1. Silicon carbide surface pretreatment:

[0029] a. Add silicon carbide with a particle size of 1-10 μm to a silicon carbide ball mill for 12h-24h; put it into a tube furnace, and heat it up to 500-600°C for 2h-4h under air or nitrogen for oxidation treatment to remove surface impurities the goal of;

[0030] b. Disperse silicon carbide in an acidic hydrophilic solution and stir for 2-3 hours, then ultrasonically disperse for 1-2 hours, and microwave for 1-2 hours to improve its hydrophilicity; then wash with distilled water, filter, and dry at 15-30°C dry to obtain hydrophilic silicon carbide;

[0031] 2. One-pot synthesis of SiC-ferrite / carbonaceous materials:

[0032] a. Weigh hydrophilic silicon carbide, ferrite soluble salt, flu...

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Abstract

The invention provides a SiC-ferrite / carbon material high-temperature wave absorption composite material and a preparation method thereof, and relates to a wave absorption composite material. The material aims at solving the technical problems of processing complexity, high cost and poor wave absorption effect of the existing wave absorption material. The wave absorption composite material provided by the invention is prepared from ferrite, silicon carbide and carbon materials. The preparation method comprises the following steps of 1, performing silicon carbide surface pretreatment, 2, uniformly mixing hydrophilic silicon carbide, ferrite preparation soluble salts, fluorides, a precipitant, a carbon material, a silane coupling agent, alcohol and water; performing hydro-thermal synthesis to obtain precursors; and then, roasting the precursors to obtain the wave absorption composite material. The 90-percent absorption can be reached at the X waveband being 8 to 12GHz; the reflection loss is lower than -10dB; and the maximum reflection loss reaches -28dB. The material can be used in the fields of monitoring of ground nuclear reactor systems, crude oil exploration, environment monitoring, aviation, spaceflight, radar, communication systems, high-power electronic converters and automobile motors.

Description

technical field [0001] The invention relates to a wave-absorbing composite material and a preparation method thereof, and belongs to the field of high-temperature wave-absorbing functional composite materials. Background technique [0002] With the rapid development of information technology, microwave absorbing materials play an increasingly important role in electronic reliability, medical care, national defense security, etc. For example, microwave absorbers used in emerging high-speed communication devices such as satellites can improve signal quality at receivers by suppressing noise. In addition, the absorbing materials of radar stations and relay stations can protect the personnel working inside from excessive radiation of high-power microwaves. Most importantly, with the gradual maturity of new advanced anti-stealth radars such as ultra-wideband radars, phased array radars, multistatic radars, and passive radars, high-performance anti-detection absorbing materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00H01Q17/004
Inventor 李季刘继鹏杨春晖张磊
Owner HARBIN INST OF TECH
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