High emissivity double-layer coating on the flexible aluminum silicate fiber fabric with enhanced interfacial bonding strength and high temperature resistance

A high emissivity double-layer coating with SiC and ZrO 2 as emittance agents was prepared on the surface of flexible aluminum silicate fiber fabric (ASFF) to improve the thermal insulation performance of the fiber fabric. The tensile strength and interfacial bonding strength of raw ASFF, ASFF with single-layer ZrO 2 coating and ASFF with double-layer SiC-ZrO 2 coating were compared and studied. The ASFF with SiC-ZrO 2 coating still exhibits a high tensile strength of 75 MPa after heat treated at 1100 °C. The shear bond strength of the coating/substrate interface and the coating/coating interface is 0.08 MPa and 0.18 MPa, respectively. The spectral emissivity of the SiC-ZrO 2 coating is as high as 0.93, which is about 1.6 times that of the raw ASFF. The heat-proof and thermal insulation integrated composite consisting of flexible ASFF substrate and double-layer SiC-ZrO 2 high emissivity coating demonstrated potential application as large area of thermal protection material.