A temperature-resistant 1650°C fiber-reinforced ceramic matrix composite material surface oxidation resistance/infrared stealth coating and its preparation method

Abstract

The invention relates to the technical field of high-temperature infrared stealth materials, and specifically discloses an anti-oxidation / infrared stealth coating on the surface of a fiber-reinforced ceramic matrix composite material with a temperature resistance of 1650°C. The infrared stealth coating has a layered structure, which consists of A ceramic inner layer, a ceramic middle layer, a ceramic outer layer and a low infrared emissivity functional layer, the ceramic inner layer is a mullite layer, the ceramic middle layer is a rare earth silicate layer, and the ceramic outer layer is an 8YSZ layer , the low infrared emissivity functional layer is based on Pt as the conductive phase, Bi 2 o 3 coating for the binder phase. The invention also provides a preparation method for the anti-oxidation / infrared stealth coating on the surface of the fiber-reinforced ceramic matrix composite material with a temperature resistance of 1650°C. The infrared stealth coating of the invention improves the oxidation resistance and high temperature stability of the composite material, can significantly reduce the infrared radiation intensity of the base material, and has excellent oxidation resistance and infrared stealth function.

Description

technical field [0001] The invention belongs to the technical field of high-temperature infrared stealth materials, and in particular relates to an anti-oxidation / infrared stealth coating on the surface of a fiber-reinforced ceramic matrix composite material with a temperature resistance of 1650°C and a preparation method thereof. Background technique [0002] In recent years, infrared detection and tracking technology has developed rapidly, and infrared guided weapons have become the main threat in air combat. In order to improve the survival and penetration capabilities of the new generation of aircraft, it is urgent to develop advanced and effective infrared stealth technology. Infrared stealth technology is a technology that reduces the infrared radiation difference between the target and the background by controlling or reducing the infrared radiation characteristics of the target, thereby reducing the target's detection, tracking, identification, attack distance and pro...

AI Technical Summary

Problems solved by technology

As the thrust-to-weight ratio of the engine and the flight speed of the aircraft increase, the surface temperature of the aircraft and the temperature inside the engine exceed 1000°C or even higher. Low-emissivity fillers have low melting point, easy oxidation at high temperature, easy migration and diffusion at high temperature, and other high-temperature performance instability, which makes it impossible to use in high-temperature environments; poor compatibility between coatings and substrates, between coatings, between coatings and substrate materials Thermal mismatch, resulting in cracking or peeling of the coating; the phase instability of the coating at high temperature, phase transition, the accompanying volume change during the transition process may lead to cracking of the coating, etc.

In addition, the existing traditional physical platinum coating can withstand high temperature, but the platinum coating and the substrate mainly rely on physical bonding, the bonding strength is low, the thermal mismatch with the substrate is serious, and it is easy to fall off after repeated thermal shocks, and its performance is unstable in high temperature environments , there is also the problem of high preparation cost

[0004] As the structural materials of high-temperature parts of aircraft are advancing towards high temperature and light weight, traditional alloy materials can no longer meet the demand. Ceramic matrix composite materials with carbon fiber as the reinforcement phase have become the focus of development. This type of composite material has high temperature resistance, low density and high strength. and other advantages, can meet the requirements of high temperature and light weight, but this kind of composite material is easy to oxidize under high temperature oxygen-enriched and water vapor conditions, so that the performance of the material is seriously reduced. In order to make the composite material stable in high temperature environment, it is necessary to carry out Antioxidant treatment

Images