Structural design of the multi-layer SiC nanofiber composite aerogel felt for applications in high-temperature thermal-insulating refractories

In order to improve the high-temperature resistance and thermal insulation of SiC nanofiber aerogel, the structural design and preparation of SiC nanofiber composite aerogel felt were carried out based on the heat transfer mechanism. A novel multi-layer SiC nanofiber aerogel felt was prepared with the ablative layer (ZrO 2 /ZrSiO 4 anti-oxidation layer), opacifiers layer (TiO 2 and SiC), and heat insulation layer (SiC nanowire aerogel). Compared with the single SiC nanowire aerogel, the oxidation resistance temperature of SiC nanofiber composite aerogel felt increased from 1300 ℃ to 1500 ℃ during aerobic calcination. With the butane gun ablation, the back temperature of the single SiC nanofiber aerogel felt was 308 ℃, while the back temperature of the composite aerogel felt was only 130 ℃. The structural design of the multi-layer SiC nanofiber composite aerogel felt provides an approach to improving thermal insulation properties in extreme environments.