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Ultra-wide-band wave absorbing structure integrating temperature resistance and mechanical properties and preparation method of ultra-wide-band wave absorbing structure

An ultra-wideband, wave-structured technology, applied in chemical instruments and methods, laminated, layered products, etc., can solve the problems of poor stealth performance of ultra-low frequency, can not be applied to high-speed flight environment, etc., achieves strong designability, solves problems of radar The stealth problem, the effect of solving the ultra-wideband stealth problem compatible with temperature resistance and mechanical properties

Active Publication Date: 2019-04-26
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the conventional wave-absorbing structure stealth scheme cannot be applied to the high-speed flight environment and the low-frequency stealth performance of the electric loss type high-temperature resistant wave-absorbing material or metamaterial is poor, the present invention proposes a high-speed flight environment that can be compatible with temperature-resistant Performance and mechanical properties of ultra-broadband absorbing structure

Method used

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  • Ultra-wide-band wave absorbing structure integrating temperature resistance and mechanical properties and preparation method of ultra-wide-band wave absorbing structure
  • Ultra-wide-band wave absorbing structure integrating temperature resistance and mechanical properties and preparation method of ultra-wide-band wave absorbing structure
  • Ultra-wide-band wave absorbing structure integrating temperature resistance and mechanical properties and preparation method of ultra-wide-band wave absorbing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: Prepare the electromagnetic shielding layer

[0043] Two-dimensional laminated shielding SiC fibers (the real part of the dielectric constant is >20) are selected as the prefabricated body of the electromagnetic shielding layer, and the rough blank is prepared by the fiber impregnation and pyrolysis process (PIP). After the braid has sufficient strength and toughness, pass The electromagnetic shielding layer is obtained by machining.

[0044] Step 2: Prepare the magnetic wave-absorbing patch layer

[0045] Pour vulcanized polyurethane rubber and micron magnetic iron powder (60wt.%) into an open mill and knead evenly. The kneading temperature is 25°C-60°C, and the above-mentioned mixture is pressed into a wave-absorbing layer with a thickness of 0.3-3mm by a calender. Raw film, cut into the designed shape, put it into the mold, heat up and vulcanize after closing the mold, and obtain the required magnetic wave-absorbing patch material, its dielectric constant an...

Embodiment 2

[0057] Step 1: Prepare the electromagnetic shielding layer

[0058] The two-dimensional laminated T300 carbon fiber (conductivity is about 40000S / m) is selected as the prefabricated body of the electromagnetic shielding layer. After the braid has sufficient strength and toughness, the electromagnetic shielding layer is obtained by machining.

[0059] Step 2: Prepare precursors containing magnetic absorbers

[0060] Using micron magnetic iron-nickel alloy powder (75wt.%) as the wave absorbing agent and silica sol as the solvent, the wave absorbing agent and the solvent are fully mixed by mechanical stirring and ultrasonic dispersion to form a slurry to prepare the bottom magnetic wave absorbing material layer.

[0061] The third step: preparation of ceramic matrix composite material layer

[0062] The ceramic matrix composite layer is made of Al 2 o 3 Fiber reinforced Al 2 o 3 Ceramic matrix composite material, choose Al 2 o 3 The fiber is braided to obtain a fiber prefo...

Embodiment 3

[0074] Step 1: Prepare the electromagnetic shielding layer

[0075] The two-dimensional laminated T300 carbon fiber (conductivity is about 40000S / m) is selected as the prefabricated body of the electromagnetic shielding layer. After the braid has sufficient strength and toughness, the electromagnetic shielding layer is obtained by machining.

[0076] Step 2: Prepare precursors containing magnetic absorbers

[0077] Using micron iron powder (75wt.%) as wave absorbing agent, Al 2 o 3 The precursor is a solvent, and the wave absorbing agent and solvent are fully mixed by mechanical stirring and ultrasonic dispersion to form a slurry to prepare the bottom magnetic wave absorbing material.

[0078] The third step: preparation of ceramic matrix composite material layer

[0079] The ceramic matrix composite material is made of silicon nitride fiber reinforced silicon nitride ceramic matrix composite material, and the silicon nitride fiber is used for weaving to obtain a fiber pref...

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Abstract

The invention provides an ultra-wide-band wave absorbing structure integrating temperature resistance and mechanical properties and a preparation method of the ultra-wide-band wave absorbing structure. The ultra-wide-band wave absorbing structure comprises an inorganic anti-oxidation layer, a ceramic matrix composite layer I, aerogel layers, periodic structure layers, a ceramic matrix composite layer II, a magnetic wave absorbing material layer and an electromagnetic shielding layer from outside to inside. The electrical loss type wave absorbing structure with heat insulation performance and high-temperature resistance is designed on the outer surface of the ultra-wide-band wave absorbing structure by using periodic structures, effective absorption of high-frequency electromagnetic waves,heat insulation and cooling are realized, a bottom magnetic wave absorbing material is enabled to be at lower operating temperature, the stealth performance of the structure is basically unchanged, and finally, the ultra-wide-band wave absorbing structure integrating the temperature resistance and the mechanical properties is obtained. The problem about radar stealth for high-temperature strong scattering parts such as an inlet of a high-speed flight vehicle under intense aerodynamic heating condition can be solved.

Description

technical field [0001] The invention belongs to the technical field of high-speed aircraft stealth, and in particular relates to an ultra-broadband wave-absorbing structure compatible with temperature resistance and mechanical properties and a preparation method thereof. Background technique [0002] The severe aerodynamic heating generated under high-speed flight conditions will cause the ambient temperature of high-temperature components such as the air inlet of the high-speed aircraft to exceed 600 °C, and the highest temperature can reach 1400 °C. Stealth is an important indicator of high-speed aircraft in the future. Strong scattering components such as air inlets of high-speed aircraft are important components of the power system. Their shape depends on the integration requirements of overall, power, and aerodynamics. However, the high-temperature stealth material and structure technology is the most important and effective technical way to suppress the strong radar sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B37/00B32B33/00
CPCB32B9/005B32B9/04B32B9/041B32B9/043B32B9/045B32B33/00B32B37/00B32B2260/021B32B2262/10B32B2307/20B32B2307/212B32B2307/304B32B2307/306B32B2605/18
Inventor 郝璐刘晓菲郭晓铛戴全辉
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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