Three-layer composite coatings with compatibility of low infrared emissivity and high wave transmittance

Abstract

The study of infrared stealth-compatible, electromagnetic wave-transparent technology is currently receiving a lot of attention due to the functional specificity of the equipment, such as radomes. In this study, a new method of layered spraying was used to construct three-layer composite coatings, in which each layer was sprayed with a different formulation of paint. By adjusting the content of aluminum powder in each layer and keeping the content of carbon fiber (CF) at 4 wt%, the three-layer composite coatings achieved a balance of dielectric property, antistatic performance, and low infrared (IR) emissivity. The A3-A0-A0 composite coating, which matched the parameters for low IR emissivity and low dielectric property, had an IR emissivity of 0.498, a dielectric constant at 9.375 GHz of 6.23, and a dielectric loss of 0.038. The findings demonstrate that the aluminum powder content of the topmost layer had the sole significant impact on the three-layer composite coatings' IR emissivity, although the dielectric constant was strongly associated with the coating's overall aluminum powder content. The novel three-layer composite coating offers a brilliant concept for the study and development of materials that are compatible with wave transmission and infrared stealth.