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A kind of high temperature resistant structural wave absorbing material based on metal coating and its preparation method

A technology of wave absorbing material and metal coating, applied in the field of wave absorbing material, can solve the problem of large change of wave absorbing performance with temperature rise, and achieve the effect of realizing impedance matching design, low dielectric constant, and meeting the needs of light weight

Active Publication Date: 2019-12-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patents CN107039778A, CN107141021A, CN106042515A, and CN106007804A respectively announced several high-temperature-resistant structure absorbing materials, using materials such as metal oxide ceramics and conductive glass to prepare a wave-absorbing structure based on a frequency-selective surface, which has good high-temperature resistance and Broadband absorbing performance, but its absorbing performance changes greatly with temperature rise

Method used

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  • A kind of high temperature resistant structural wave absorbing material based on metal coating and its preparation method
  • A kind of high temperature resistant structural wave absorbing material based on metal coating and its preparation method
  • A kind of high temperature resistant structural wave absorbing material based on metal coating and its preparation method

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Effect test

Embodiment 1

[0037] A kind of high temperature resistant structural wave absorbing material based on metal coating of the present invention, such as figure 1 As shown, it is composed of two sets of structural absorbers. The structural absorber includes a dielectric base layer and an impedance layer from bottom to top. The dielectric base layer is a silica fiber reinforced silica airgel composite material. The resistance layer is quartz fiber cloth coated with nickel-chromium alloy. Its preparation method comprises the following steps:

[0038] (1) Preparation of medium substrate: select quartz fiber reinforced silica airgel composite material according to design requirements, prepare quartz fiber reinforced silica airgel composite material by sol-gel process, and finally, use mechanical processing method to make the composite The material is processed to 7.5mm to make 7.5mm thick dielectric base layer 1 and dielectric base layer 2;

[0039] (2) Preparation of impedance layer: Using the ...

Embodiment 2

[0045] A metal coating-based high-temperature-resistant structural wave-absorbing material of the present invention is composed of a group of structural wave-absorbing bodies, and the structural wave-absorbing body includes a dielectric base layer and an impedance layer from bottom to top, and the dielectric base layer It is a continuous mullite fiber reinforced silicon oxide airgel composite material, and the resistance layer is a boron nitride fiber cloth coated with nickel-chromium-iron alloy. Its preparation method comprises the following steps:

[0046] (1) Preparation of medium substrate: Select quartz fiber-reinforced silica airgel composite material according to the design requirements, and prepare continuous mullite fiber-reinforced silica airgel composite material by sol-gel process, and finally, adopt mechanical processing method , process the composite material to 7.5mm to make a 7.5mm thick dielectric base layer;

[0047] (2) Preparation of impedance layer: The mag...

Embodiment 3

[0052] A kind of high temperature resistant structural wave absorbing material based on metal coating of the present invention, such as figure 1 As shown, it is composed of two sets of structural absorbers. The structural absorber includes a dielectric base layer and an impedance layer from bottom to top. The dielectric base layer is a silica fiber reinforced silica airgel composite material. The resistive layer is silicon carbide fiber cloth coated with Ni-Cr-Nd alloy. Its preparation method comprises the following steps:

[0053] (1) Preparation of medium substrate: select quartz fiber reinforced silica airgel composite material according to the design requirements, prepare quartz fiber reinforced silica airgel composite material by sol-gel process, and finally, use mechanical processing method to make the composite The material is processed to 5mm to make a dielectric base layer 1 and a dielectric base layer 2 with a thickness of 5 mm;

[0054] (2) Preparation of impedan...

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Abstract

The invention discloses a metal coating-based high temperature-resistant structural wave absorbing material and a preparation method thereof. The high temperature-resistant structural wave absorbing material is formed by coating a structural wave absorbing body with a high temperature-resistant fiber cloth; the structural wave absorbing body is formed by a group of structural wave absorbing body units or is formed by laminating two or more structural wave absorbing body units; and every structural wave absorbing body unit comprises a dielectric substrate layer and an impedance layer on the surface of the dielectric substrate layer. The preparation method comprises the following steps: sputtering a high temperature-resistant metal material onto the surface of the high temperature-resistantfiber cloth by using a magnetron sputtering process to obtain the impedance layer; covering the surface of the dielectric substrate layer with the impedance layer to obtain the group of structural wave absorbing units; and coating the group of structural wave absorbing body units or the plurality of laminated structural wave absorbing body units with the high temperature-resistant fiber cloth, andperforming stitching to obtain the high temperature-resistant structural wave absorbing material being able to withstand a high temperature of 700 DEG C or above, having good resistance to the high temperature and oxidation and having a wide wave absorbing bandwidth.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a wave-absorbing material with high temperature resistance, oxidation resistance, and a wide wave-absorbing bandwidth, and a preparation method thereof, which belongs to the technical field of wave-absorbing materials. Background technique [0002] With the development of modern military technology, stealth technology has been applied in various complex environments. For example, the exhaust nozzles, nose cone caps, wing fronts and other components of air weapons such as fighter jets and cruise missiles can operate at temperatures above 700°C or even 1000°C. Key factor. Since the Curie temperature of most magnetic materials is lower than 700°C, it loses its absorbing effect at the operating temperature of high-temperature components. Therefore, most high-temperature absorbing materials are electric loss absorbing materials. Compared with magnetic absorbing materials used at room tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B19/04B32B5/02B32B33/00C23C14/35C23C14/18
Inventor 杜作娟汪翔宇姜超黄小忠赵子翔张乾诚
Owner CENT SOUTH UNIV
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