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A heat-insulating stealthy high-temperature-resistant air inlet and its preparation method

A technology of air intake and high temperature resistance, applied in the field of aircraft stealth, can solve the problems of not considering the stealth performance requirements of the air intake, limited radar absorbing effect, high density of absorbing paint, etc., to solve the problem of heat insulation and stealth integration , The preparation method is effective and feasible, and the effect of low-frequency wave-absorbing performance is good

Active Publication Date: 2019-07-09
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent "An Inlet Heat Insulation Device" (Application No.: CN201320616014.7) discloses an air inlet heat insulation device based on airgel and ceramic materials. The disadvantage is that the device only It meets the heat insulation requirements of the air intake of high-speed aircraft, without considering the stealth performance requirements of the air intake; the Chinese patent "Preparation method of a double-layer heat-resistant heat-insulating and wave-absorbing composite material" (application number: CN201611259844.3) was published A heat-resistant heat-insulating and wave-absorbing composite material based on a porous structure ceramic fiber material. Wave paint is dense and only suitable for ground construction, it is difficult to apply on aircraft

Method used

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  • A heat-insulating stealthy high-temperature-resistant air inlet and its preparation method
  • A heat-insulating stealthy high-temperature-resistant air inlet and its preparation method
  • A heat-insulating stealthy high-temperature-resistant air inlet and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: (two layers of heat insulation core layer, one layer of electromagnetic periodic structure)

[0028] Step 1: Prepare the insulating core layer

[0029] Preparation of SiO by Sol-Gel Process 2 wet gel. According to the matching design requirements, according to the order that the SiC fiber accounts for 0.05% and 2% of the volume of the heat insulation layer from the inside to the outside, add SiC fibers (dielectric real part is 3~12, imaginary part is 0~ 18) Stir well. SiO 2 The fiber mat is impregnated into the wet gel as a reinforcement, and the SiO with a dielectric constant gradually increasing from the inside to the outside is prepared by a supercritical drying process. 2 Fiber Mat Reinforced SiO 2 Airgel insulation composites. to SiO 2 The airgel insulation composite material is subjected to 500°C air atmosphere high-temperature heat treatment to remove residual organic matter and carbon impurities, and hydrophobic treatment is performed to red...

Embodiment 2

[0036] Embodiment 2: (three-layer heat insulation core layer, two-layer electromagnetic periodic structure)

[0037] Step 1: Prepare the insulating core layer

[0038]Preparation of Al by Sol-Gel Process 2 o 3 wet gel. According to the matching design requirements, according to the heat insulation layer from the inside to the outside, the SiC fiber accounts for the volume of the heat insulation layer in the order of 0.01%, 0.2% and 5% respectively. Part is 0~18) Stir evenly. Will Al 2 o 3 The fiber mat was impregnated into the wet gel as a reinforcement, and the Al with a dielectric constant gradually increasing from the inside to the outside was prepared by a supercritical drying process. 2 o 3 Fiber Mat Reinforced Al 2 o 3 Airgel insulation composites. to Al 2 o 3 The airgel thermal insulation composite material undergoes high-temperature heat treatment to remove residual organic matter and carbon impurities, and performs hydrophobic treatment to reduce the hydro...

Embodiment 3

[0045] Embodiment 3: (four layers of heat insulation core layer, three layers of electromagnetic periodic structure)

[0046] Step 1: Prepare the insulating core layer

[0047] SiN wet gels were prepared by sol-gel process. According to the matching design requirements, according to the heat insulation layer from the inside to the outside, the SiC fiber accounts for the volume of the heat insulation layer in the order of 0.01%, 0.2%, 2% and 4.5%, and the SiC fiber (dielectric real part is 3~ 12, the imaginary part is 0-18) Stir evenly. The SiN fiber mat was impregnated into the wet gel as a reinforcement, and the SiN airgel thermal insulation composite material reinforced with SiN fiber mat with a dielectric constant gradually increasing from the inside to the outside was prepared by supercritical drying process. Carry out high-temperature heat treatment on the SiN airgel thermal insulation composite material to remove residual organic matter and carbon impurities, and carry...

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Abstract

The invention provides a heat-insulation stealthy high-temperature-resistant gas inlet duct. The gas inlet duct comprises a wave-transparent layer, a heat-insulation stealth layer, an electromagneticshielding layer and a low emissivity coating from inside to outside. The wave-transparent layer is formed by a continuously oxide-enhanced oxide-based composite material; the heat-insulation stealth layer is a multilayer composite material which is formed by alternately arranging heat-insulation core layers and electromagnetic periodic structure wave absorbing layers in a matching optimizing design manner, every heat-insulation core layer is a ceramic fiber mat reinforced aerogel composite heat-insulation core layer, and the electromagnetic periodic structure wave absorbing layer is composed of a high-temperature electromagnetic periodic structure cell pattern; and the electromagnetic shielding layer is formed by carbon fibers, and the low infrared emissivity coating is sprayed on the external surface of the electromagnetic shielding layer. The heat-insulation stealthy high-temperature-resistant gas inlet duct has the advantages of good heat insulation effect, wide wave absorbing frequency band, good low-frequency wave absorbing performance and certain infrared stealth performance, and can be applied to high-speed aircrafts to solve the problems of heat insulation and radar and infrared stealth of aircraft gas inlet ducts under severe aerodynamic heating conditions.

Description

technical field [0001] The invention belongs to the technical field of aircraft stealth, and in particular relates to a heat-insulating stealth and high-temperature-resistant air inlet and a preparation method thereof. The air inlet has functions of radar stealth and infrared stealth at the same time. Background technique [0002] The inner side of the air inlet of high-speed aircraft is mostly bomb / machine equipment, and its working temperature is not higher than 80°C, while the aerodynamic heating temperature of the inner surface of the air inlet can be as high as several hundred degrees Celsius, so anti-heat insulation measures must be taken to ensure the normal operation of the equipment. At the same time, the air inlet is an important source of forward scattering radiation for high-speed aircraft, and it is urgent to take stealth measures to reduce its RCS, suppress its infrared radiation, and improve the stealth penetration performance of high-speed aircraft. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B5/06B32B33/00B32B37/00B32B38/14B32B1/08B64D33/02
CPCB32B1/08B32B5/02B32B5/06B32B5/26B32B33/00B32B37/00B32B38/145B32B2037/243B32B2255/02B32B2255/205B32B2260/021B32B2260/04B32B2262/10B32B2262/105B32B2262/106B32B2307/306B32B2597/00B32B2605/18B64D33/02B64D2033/0253
Inventor 郝璐刘海韬郭晓铛杨晓树戴全辉张松靖
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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