High-temperature radar infrared compatible stealth coating with functional gradient distribution and preparation method thereof

Abstract

The invention relates to the technical field of high-temperature stealth coatings, and specifically discloses a high-temperature radar infrared-compatible stealth coating with functional gradient distribution and a preparation method thereof. The high-temperature radar infrared-compatible stealth coating is coated on the surface of a metal substrate, Starting from the surface of the substrate, it includes a metal bonding layer, a heat matching ceramic layer, a dielectric ceramic layer, a first high-temperature electromagnetic periodic structure layer, a dielectric isolation layer, a second high-temperature electromagnetic periodic structure layer, and an infrared stealth layer from bottom to top. The high-temperature radar infrared compatible stealth coating of the present invention has radar and infrared compatible stealth functions. The coating adopts a multi-functional layer structure, which realizes the gradient distribution of the thermal expansion coefficient of the coating, and can achieve better thermal matching with the metal substrate, and is heat resistant. Good vibration performance; the temperature of the softening point of the glass phase selected in the present invention does not exceed 600°C, which has the advantages of low sintering temperature and short time, and can reduce the effects of oxidation, damage and deformation on the metal substrate.

Description

technical field [0001] The invention belongs to the technical field of high-temperature stealth coatings, in particular to a high-temperature radar infrared compatible stealth coating with functional gradient distribution and a preparation method thereof. Background technique [0002] With the development of radar and infrared composite reconnaissance and guidance technology, radar infrared compatible stealth functional materials have become an important research direction. However, there are inherent contradictions in the realization of radar-infrared-compatible stealth with the same material. The reason is that radar stealth requires materials with strong absorption and low reflection of electromagnetic waves, while infrared stealth requires materials with low absorption and high reflection of electromagnetic waves. Therefore, how to solve the contradiction between the two through material design is the key to realize radar infrared compatible stealth. At the same time, w...

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Problems solved by technology

Chinese patent No. 201711498947.X discloses a high-temperature-resistant radar infrared compatible stealth coating and its preparation method. Infrared low emissivity frequency selective surface layer, the coating disclosed in this patent has good radar and infrared compatible stealth functions, but the nickel absorber in the ceramic wave-absorbing layer and the two components in the chip resistance type high-temperature electromagnetic periodic structure layer Molybdenum silicide conductive phase has poor oxidation resistance at high temperature for a long time, and there are big problems in high temperature and long-term use

Chinese patent No. ZL201710943403.3 discloses a radar- and infrared-compatible stealth coating with a temperature resistance of 600°C and its preparation method. The coating consists of an adhesive layer, 8YSZ-Al 2 o 3 Composed of ceramic bottom layer, high temperature resistance coating, 8YSZ isolation layer and high temperature conductor coating, this coating is mainly suitable for titanium alloy substrates, and the temperature resistance can only reach 600 °C

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