Thermally insulating flexible ceramic film based on nanowire-nanosheet dual component synergistic structure with high temperature resistance at 1300 °C

Nanoscale ceramic films have extensive application prospects in the fields of harsh environments because of their low thermal conductivity, excellent high temperature resistance and fire-retardant. However, the practical application of ceramic film materials is always constrained by structural collapse under prolonged high temperature treatment. Herein, silicon nitride nanowire‑calcium phosphate nanosheet (SiNNW/CHNT) film with synergistic structure is synthesized, where CHNT provides the high temperature protective layer and SiNNW endows the stable skeleton structure. Benefiting from the unique synergistic effect between SiNNW and CHNT, SiNNW/CHNT film demonstrates excellent stability and thermal insulation in high temperature environment. SiNNW/CHNT film exhibits superior high temperature stability, without significant dimensional change even after treated at 1200 °C for 74 h. Additionally, when a human hand is covered with SiNNW/CHNT thermal insulating gloves, it is not feel heat sensing under the butane blowtorch (1300 °C). This research might open up a new strategy for the fabrication of dual-component film with superior thermal structural stability and thermal protection efficiency.