A high-temperature-resistant broadband wave-absorbing material with dielectric gradient gradual change and its preparation method

A wave-absorbing material and high-temperature-resistant technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high temperature resistance and narrow absorption frequency band, and achieve the effect of improving high temperature resistance performance and increasing absorption bandwidth.

Active Publication Date: 2022-05-06
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the traditional magnetic absorbing materials are not resistant to high temperature and the absorption frequency band is narrow, the present invention provides a high-temperature-resistant broadband absorbing material with a gradual change in dielectric gradient and its preparation method

Method used

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  • A high-temperature-resistant broadband wave-absorbing material with dielectric gradient gradual change and its preparation method
  • A high-temperature-resistant broadband wave-absorbing material with dielectric gradient gradual change and its preparation method
  • A high-temperature-resistant broadband wave-absorbing material with dielectric gradient gradual change and its preparation method

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preparation example Construction

[0028] In the first aspect, the present invention provides a method for preparing a high-temperature-resistant broadband microwave-absorbing material with a gradual change in dielectric gradient. The method includes the following steps:

[0029] (1) Mix silicon carbide with high temperature resistant resin to prepare a variety of silicon carbide dispersions with different mass percentages of silicon carbide; in the present invention, the high temperature resistant resin can be, for example, phenolic resin, polyimide Resin or high temperature resistant epoxy resin;

[0030] (2) Scrape-coat the various silicon carbide dispersions obtained in step (1) on the surface of quartz fiber cloth respectively and immerse the silicon carbide dispersion into the quartz fiber cloth to obtain silicon carbide with different mass percentages. A plurality of modified quartz fiber cloths; in the present invention, a plurality of silicon carbide dispersions with different silicon carbide mass perc...

Embodiment 1

[0060] A high-temperature-resistant broadband absorbing material with a gradual change in dielectric gradient is prepared. The high-temperature-resistant broadband absorbing material has a four-layer structure, such as figure 1 As shown; the first layer is a micro-ceramic layer with a thickness of d1=1mm; the second layer is a low-concentration silicon carbide / quartz fiber composite layer with a thickness of d2=2mm; the third layer is a medium-concentration silicon carbide / quartz fiber composite layer, Thickness d3=2mm, the fourth layer is a high-concentration silicon carbide / quartz fiber composite layer, thickness d4=2mm.

[0061] The preparation process of the high-temperature-resistant broadband wave-absorbing material is as follows:

[0062] S1, silicon carbide and resin composite

[0063] Weigh 60g of silicon carbide with a particle size of 30nm, slowly add silicon carbide to 40g of phenolic resin to form a silicon carbide dispersion with a concentration of 60%; weigh 70...

Embodiment 2

[0072] A high-temperature-resistant broadband absorbing material with a gradual change in dielectric gradient is prepared. The high-temperature-resistant broadband absorbing material has a four-layer structure, such as figure 1 As shown; the first layer is a micro-ceramic layer with a thickness of d1=1mm; the second layer is a low-concentration silicon carbide / quartz fiber composite layer with a thickness of d2=2mm; the third layer is a medium-concentration silicon carbide / quartz fiber composite layer, Thickness d3=2mm, the fourth layer is a high-concentration silicon carbide / quartz fiber composite layer, thickness d4=2mm.

[0073] The preparation process of the high-temperature-resistant broadband wave-absorbing material is as follows:

[0074] S1, silicon carbide and resin composite

[0075] Weigh 50g of silicon carbide with a particle size of 30nm, slowly add silicon carbide to 50g of phenolic resin to form a silicon carbide dispersion with a concentration of 50%; weigh 60...

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Abstract

The invention relates to a high-temperature-resistant broadband wave-absorbing material with gradual change in dielectric gradient and a preparation method thereof. The method is as follows: mixing silicon carbide with high-temperature-resistant resin to prepare various silicon carbide dispersions with different mass percentages of silicon carbide; scraping and coating the various silicon carbide dispersions on the surface of quartz fiber cloth respectively and applying The silicon carbide dispersion is immersed in quartz fiber cloth to obtain multiple modified quartz fiber cloths with different mass percentages of silicon carbide; the multiple modified quartz fiber cloths are gradually increased or decreased according to the mass percentage of silicon carbide Laying and pasting in sequence, and then laying a piece of micro-ceramic fiber cloth on the surface of the modified quartz fiber cloth with the lowest mass percentage of silicon carbide, and finally curing to obtain a high-temperature-resistant broadband wave-absorbing material. The high-temperature-resistant broadband wave-absorbing material prepared by the invention has a reflectivity of not more than -5dB at 8-18GHz, can withstand a high temperature of 1000°C, and the wave-absorbing property does not decrease but increases, which is obviously better than traditional magnetic wave-absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant wave-absorbing materials, and in particular relates to a high-temperature-resistant broadband wave-absorbing material with a gradual change in dielectric gradient and a preparation method thereof. Background technique [0002] The microwave-absorbing material technology reduces the probability of the target being detected by the microwave measurement system and improves the target's anti-electromagnetic interference performance through the absorption and loss of electromagnetic waves. With the development of the microwave detection system, the measurement frequency band of the microwave system is getting wider and wider, which puts forward requirements for the broadband absorbing performance of the absorbing material. In some high-temperature parts of the target, the local temperature can reach 1000 ° C, which also puts forward higher requirements for the high-temperature resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 杨智慧王辉秦岩孙新黄琪贺军哲姚石磊于海涛张久霖
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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