High emissivity scale structure MoSi2-silicon glass coating on aluminum silicate fiber cloths with excellent flexibility and oxidation resistance below 1000 °C

Abstract

In order to maintain the strength of flexible substrate while applying the oxidation resistance dense glass coating, a scale structure coating on aluminum silicate fiber cloth was prepared with fused silica powder and silica sol as the binder and MoSi2 as the emissive agent. The scale structure of the coating with large cracks along the braided grain and small random cracks on the fiber bundles allowed the fiber cloth to retain its flexible properties. Due to the block effect of dense SiO2 glass phase on oxygen diffusion, the mass loss was only 0.35% after oxidation at 800 °C for 24 h while the average normal emissivity (2–14 μm) remained about 0.88. The MoSi2-silicon glass coating could avoid the generation of excessively strong interface with the substrate and improve the tensile strength of the sample to 140.52 MPa.