A temperature-resistant 1300°C frequency-selective wave-transparent/heat-insulating/stealth structure and its preparation method

Abstract

The invention relates to the technical field of high-temperature functional materials, and specifically discloses a frequency-selective wave-transmitting / heat-insulating / stealth structure with a temperature resistance of 1300°C and a preparation method thereof. The frequency-selective wave-transmitting / heat-insulating / stealth structure is defined by the incident direction of electromagnetic waves It is the outer surface, including heat insulation layer, wave transparent layer, frequency selective layer and ceramic protective layer from inside to outside. The invention also provides a preparation method of the frequency-selective wave-transparent / heat-insulating / stealth structure. The frequency selective wave transparent / heat insulation / stealth structure of the present invention has the advantages of heat insulation, wave transmission, frequency selection, and stealth multifunctional integration. Through structure and material optimization, it can withstand high temperatures of 1300 ° C. The outer surface is prepared with ceramic protection. layer, which has the advantages of anti-ablation and heat insulation.

Description

technical field [0001] The invention belongs to the technical field of high-temperature functional materials, and in particular relates to a frequency-selective wave-transmitting / heat-insulating / stealth structure with a temperature resistance of 1300°C and a preparation method thereof. Background technique [0002] Wave-transparent materials and structures (radome, antenna window, radome, etc.) are important components of antennas and communication systems. They play an important role in protecting antennas and communication systems, maintaining the shape of aircraft, etc. Feature requirements to make it work. In addition, in order to ensure the stealth and anti-jamming capabilities of the aircraft antenna system, wave-transparent materials and structures are required to have frequency-selective wave-transmitting characteristics. [0003] The frequency selective surface is a single-screen or multi-screen periodic array structure composed of a large number of passive resonan...

AI Technical Summary

Problems solved by technology

Aiming at the deficiencies of the existing technology, Chinese Patent No. 201410551086.7 proposes a high-temperature-resistant frequency-selective surface wave-transparent material and its preparation method. 2 or TiN) or high-temperature-resistant metal (one of platinum, tungsten or molybdenum) as the frequency-selective surface material. From the perspective of the selected material system, it has a certain temperature resistance, but there are also the following obvious deficiencies: 1) The porous Silicon nitride ceramic materials have low strength, poor toughness, insufficient thermal shock resistance, and poor reliability; 2) TiB used 2 Or TiN conductive ceramic materials and tungsten and molybdenum metal materials have poor high-temperature oxidation resistance. When used in a high-temperature oxygen-enriched environment, serious electrical performance degradation will occur due to oxidation, which will affect the electrical properties of the frequency selection surface.

At the same time, the wave-transmitting material used in this patent is a multi-layer structure, which is relatively complex, and the different layers are bonded by aluminum dihydrogen phosphate adhesive, which has the problem of low interlayer strength.

In addition, the technical solution disclosed in this patent does not use the corresponding technology to treat the surface of the porous silicon nitride substrate, so the frequency selective surface prepared on the porous substrate must have the disadvantage of poor quality, and the dimensional stability of the periodic pattern And the electrical performance of each period unit cannot be effectively guaranteed

Chinese patent No. 2011610837457.7 invented a high-temperature-resistant frequency-selective wave-transmitting structure. Through material system and structure optimization, this patent can better solve the problems of poor mechanical properties of materials and insufficient oxidation resistance of frequency-selective surfaces in Chinese patent No. 201410551086.7. , but there are still the following deficiencies: 1) The high-temperature resistant frequency selection wave-transparent structure does not have the function of heat insulation; 2) The temperature resistance can only reach 700~800 °C, and the temperature resistance is not high; 3) The surface of the wave-transparent layer composite material needs Only by preparing a modified adhesive layer can the preparation of a high-quality frequency selective surface be achieved, and the process is complex; 4) The outer surface of the frequency selective layer has no effective protection, and there is a risk of peeling off the frequency selective layer under high thermal loads

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