TaSi2-SiC high-emissivity coating modified by SiB6 on flexible alumina fibre fabric with enhanced oxidation resistance and high interfacial bonding strength

To improve the oxidation inhibition of TaSi2-based high-emissivity coatings at high temperatures, TaSi2-SiC coating modified by SiB6 was prepared on the surface of alumina fibre fabrics. The effects of the SiB6 content on the surface appearance and emissivity of the coating were investigated, and the mechanical properties of the coated fabrics were compared. When the SiB6 content in the coating was 2.5%, the borosilicate glass liquid phase generated by SiB6 oxidation effectively prevented the oxidation of TaSi2. The bond strength between the coatings and fibre fabric was 207 kPa after calcination at 1200 degrees C, which was 39% higher than that of the coated fabric without SiB6. The emissivity of the TaSi2-SiC coating, modified by a SiB6 content of 2.5%, reached above 0.92 after calcination at 1200 degrees C for 5 h. Therefore, the TaSi2-SiC high-emissivity coating modified by SiB6 has good application prospects in the field of thermal protection.