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High-temperature-resistant air intake passage with both radar stealth and infrared stealth and preparation method thereof

A radar stealth and air intake technology, which is applied to the combustion of the air intake of the power unit, the arrangement/installation of the power unit, and the assembly of the aircraft, etc. The problem of high infrared emissivity of stealth coating can solve the problems of radar stealth and infrared stealth, with strong designability and high working temperature.

Active Publication Date: 2018-03-16
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] The difficulty of being compatible with radar stealth and infrared stealth is that there is a design contradiction between the two: Chinese patent "A Compatible Radar and Infrared Stealth Fabric and Its Preparation and Application" (authorization number: CN 103710991 B) discloses a radar and infrared stealth fabric Infrared stealth fabric and its preparation method, its disadvantage is that the infrared emissivity of the radar stealth coating is relatively high, which cannot meet the application requirements of the air inlet for infrared stealth; Method for Infrared Stealth Coating" (authorization number: CN 103980806 B) discloses a method for adding an infrared stealth coating to the surface of a radar absorbing layer object. The disadvantage is that the infrared stealth coating has high radar wave reflection characteristics, making its radar stealth performance worse, and cannot meet the application requirements of the air inlet for radar stealth; a Chinese patent "Radar and Infrared Compatible Stealth Material and Its Preparation Method" (authorization number: CN 102179968 B) discloses a compatible Radar and infrared stealth fabric and its preparation method. This method can initially realize the compatibility of radar and infrared stealth. The disadvantage is that the radar and infrared compatible stealth material adopts resin-based composite materials, which cannot withstand the high temperature conditions of supersonic aircraft. The disclosed preparation technology is not suitable for high temperature resistant air inlet

Method used

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  • High-temperature-resistant air intake passage with both radar stealth and infrared stealth and preparation method thereof
  • High-temperature-resistant air intake passage with both radar stealth and infrared stealth and preparation method thereof
  • High-temperature-resistant air intake passage with both radar stealth and infrared stealth and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Prepare the wave-absorbing and bearing-integrated layer and the electromagnetic shielding layer

[0039] The wave-absorbing SiC fiber (the real part of the dielectric constant is 14-20) and T300 carbon fiber (the electrical conductivity is about 50000S / m) are selected to weave according to the inlet model, and the rough blank is prepared by fiber impregnation and pyrolysis (PIP). After the braid has sufficient strength and toughness, it is machined according to the shape of the air inlet model to obtain an integrated wave-absorbing and bearing layer and an electromagnetic shielding layer.

[0040] The second step: post-densification treatment and fine machining

[0041] Carry out five cycles of conventional ceramic precursor impregnation and pyrolysis process (PIP) to convert the product obtained in the first step from an open-cell structure to a closed-cell structure, stop after the air inlet does not increase in weight, and then perform precise machining. Mak...

Embodiment 2

[0051] Step 1: Prepare the absorbing and bearing integrated layer

[0052] SiN fiber (dielectric constant real part 3-8) is used as matching layer (thickness is 1.3mm), SiC fiber (dielectric constant real part is 16-20) is used as absorbing layer (thickness is 2.8mm), T300 carbon fiber ( The electrical conductivity is about 50000S / m) as the electromagnetic shielding layer (thickness is 0.15mm), integrated weaving is carried out according to the air inlet model, and the rough blank is prepared by fiber impregnation and pyrolysis process (PIP), and the woven piece has sufficient strength and toughness Finally, machining is carried out according to the shape of the inlet model to obtain the wave-absorbing and bearing-integrated layer and the electromagnetic shielding layer.

[0053] The second step: post-densification treatment and fine machining

[0054] Carry out six cycles of conventional ceramic precursor impregnation and pyrolysis process (PIP) to convert the product obtain...

Embodiment 3

[0064] Step 1: Prepare the wave-absorbing and bearing-integrated layer and the electromagnetic shielding layer

[0065] Select wave-absorbing SiC fibers (the real part of the dielectric constant is 12-20) and shielding SiC fibers (conductivity is about 50S / m) to weave according to the inlet model, and use the fiber impregnation and pyrolysis process (PIP) to prepare rough blanks , after the braid has sufficient strength and toughness, it is machined according to the shape of the inlet model to obtain the wave-absorbing and bearing-integrated layer and the electromagnetic shielding layer.

[0066] The second step: post-densification treatment and fine machining

[0067] Carry out five cycles of conventional ceramic precursor impregnation and pyrolysis process (PIP) to convert the product obtained in the first step from an open-cell structure to a closed-cell structure, stop after the air inlet does not increase in weight, and then perform precise machining. Make its shape cons...

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Abstract

The invention discloses a high-temperature-resistant air intake passage with both radar stealth and infrared stealth and a preparation method thereof. The high-temperature air intake passage is composed of radar stealth and infrared stealth compatibility zone coating, ceramic coating, wave-absorbing and bearing integrated layer, electromagnetic shielding layer, ceramic coating and low-emissivity infrared stealth coating from inside to outside. The radar stealth and infrared stealth compatibility zone coating has periodic patterns and is made of a precious metal and SiO2 by bonding; the ceramiccoating is composed of a glass layer or a mullite layer; the wave-absorbing and bearing integrated layer is composed of a fiber-reinforced high-temperature-resistant ceramic-based wave-absorbing composite material; and the electromagnetic shielding layer is composed of high-conductivity carbon fiber or silicon carbide fiber; the infrared stealth coating is composed of a low-emissivity noble metalfilm. The high-temperature-resistant air intake passage has high working temperature, strong designability and the advantages of both radar stealth and infrared stealth and can solve the problem of radar stealth and infrared stealth of a hypersonic vehicle air intake passage under severe aerodynamic heating conditions.

Description

technical field [0001] The invention belongs to the technical field of hypersonic aircraft stealth, and in particular relates to a high-temperature-resistant air inlet compatible with radar stealth and infrared stealth and a preparation method thereof. Background technique [0002] The severe aerodynamic heating generated under supersonic flight conditions (above Ma2) will cause the ambient temperature of the hypersonic vehicle inlet to exceed 600°C, up to 800°C, and the infrared radiation is abnormally prominent. Since the air inlet is the most important source of radar scattering and infrared radiation in the forward direction of a hypersonic vehicle, it is urgent to develop a high-temperature-resistant air inlet compatible with radar stealth and infrared stealth to improve the stealth performance of the aircraft. [0003] The difficulty of being compatible with radar stealth and infrared stealth is that there is a design contradiction between the two: Chinese patent "A Co...

Claims

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Application Information

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IPC IPC(8): B64D33/02B64F5/10
CPCB64D33/02B64D2033/026B64F5/10
Inventor 郝璐刘海韬杨晓树刘晓菲戴全辉
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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