A high-temperature radar absorbing coating based on a disordered electromagnetic periodic structure and its preparation method

Abstract

The invention relates to the field of high-temperature stealth materials, and specifically discloses a high-temperature radar absorbing coating based on a disordered electromagnetic periodic structure. The high-temperature radar absorbing coating is coated on the surface of a metal substrate, starting from the surface of the metal substrate, From bottom to top, it includes the metal bonding layer, the first ceramic loss layer, the first high-temperature lossy and disordered electromagnetic periodic structure layer, the second ceramic loss layer, the second high-temperature lossy and disordered electromagnetic periodic structure layer, and the third ceramic loss layer, the third high-temperature lossy-disorder electromagnetic periodic structure layer, the high-temperature lossy-disorder electromagnetic periodic structure layer is a patch array structure, the patch array unit is a short tangent, and the short tangent is composed of a high-temperature glass bonding phase and a noble metal conductive phase . The coating of the present invention has excellent bonding strength, thermal shock resistance and long-term high-temperature stability, and has good radar wave-absorbing performance at room temperature and high temperature, and the wave-absorbing performance at room temperature and high temperature is consistent; for incident waves with different polarization directions Both have absorption effect and are beneficial to engineering application.

Description

technical field [0001] The invention belongs to the field of high-temperature stealth materials, in particular to a high-temperature radar wave-absorbing coating based on a disordered electromagnetic periodic structure and a preparation method thereof. Background technique [0002] Stealth technology can use various means to change or reduce the detectability of the target, thereby improving the survival and penetration capabilities of the target. Absorbing materials are a class of materials that can attenuate incident radar waves and thus have stealth properties. Absorbing materials are mainly divided into structural absorbing materials and radar absorbing coatings. Compared with structural absorbing materials, radar absorbing coatings have the advantages of simple process technology, little impact on equipment structure, and low cost. It has broad application prospects in the surface stealth technology processing of various aircraft. With the improvement of the flight sp...

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Problems solved by technology

[0003] Traditional high-temperature radar absorbing coatings mainly adopt the technical scheme of adding high-temperature radar absorbers to low-loss ceramic coatings, which mainly has three problems. 1) In order to achieve radar absorbing performance, the amount of radar absorbers usually added Many, material uniformity and controllability are poor, and the mismatch of thermophysical properties of the various components of the coating can easily lead to problems such as cracking and peeling off of the coating; 2) The microwave dielectric constant dispersion characteristics of high-temperature radar absorbers are poor, and broadband absorbing The performance is not ideal, and the thickness of the coating to achieve the established target of absorbing performance is large, which will further cause the problems of reduced reliability and increased weight; 3) The electrical properties of high-temperature radar absorbers change significantly with temperature, resulting in the difference between normal temperature and high temperature environment of the coating. The difference in absorbing performance is obvious, which brings great difficulties to the normal temperature detection, identification and evaluation of radar stealth performance of coating equipment

Chinese patent document No. 201711498947.X discloses a high-temperature-resistant radar infrared-compatible stealth coating and its preparation method. The coating adopts a chip resistance type high-temperature periodic structure layer to achieve radar absorbing performance, which can better solve the above problems. However, the high-temperature resistance coating used uses low-melting point lead-free glass as the bonding phase and molybdenum disilicide as the conductive phase, resulting in low temperature resistance and problems such as easy oxidation of molybdenum disilicide when used at high temperatures for a long time.

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