SiC nanobamboo-Si₃N₄ nanowire binary interlocking film with multifunctional properties

Advanced ceramic films with multifunctional properties such as excellent high-temperature stability and superior thermal insulating are urgently needed in harsh environments. However, the practical application of ceramic film materials is invariably limited by the material degradation and volume shrinkage at high temperature. Herein, we report the interlocking structured SiC nanobamboo-Si₃N₄ nanowire (SNSC) film that simultaneously features ultra-high temperature resistance for a long time and excellent thermal insulating and hydrophobicity. Benefiting from the confinement effect of the SiC nanobamboo and the pinning effect of the binary interlocking structure, the SNSC film provides high-temperature resistance up to 1300 °C for 15 h. Moreover, SNSC film exhibits thermal insulating properties owing to the pore structure and interface reflection. In addition, the unique interlocking structure formed by SNSC film enables it to be used not only independently, but also as a composite material reinforcement, which has enormous application potential. In this work, SNSC film effectively improves the cohesive strength and tensile properties of pyrolytic carbon matrix. These remarkable performances make the SNSC film ideal for ultra-high temperature materials used in harsh working conditions.