Ceramic nanofibers with excellent thermal stability and low thermal conductivity are highly desired for high-temperature thermal insulation applications. However, the incompatibility of thermal stability and low thermal conductivity at high-temperatures largely limit the practical use of conventional single-phase ceramic nanofibers. Here, we report the preparation of multi-phase SiZrOC nanofiber membranes (NFMs) composed of amorphous SiOC and ZrO₂ nanocrystals via electrospinning technique. The fabricated SiZrOC NFMs exhibited excellent high-temperature stability (∼1200 °C in Ar) and low thermal conductivity (∼0.1392 W m⁻¹ K⁻¹ at 1000 °C in N₂). The decreased thermal conductivity is achieved through a synergistic mechanism, that the multi-phase interfaces and the ZrO₂ nanocrystals create thermal transfer barriers to reduce the heat transfer, whilst the SiOC phase effectively suppresses radiative heat transfer. This unique combination of amorphous SiOC and ZrO₂ nanocrystals provides a novel strategy to prepare high-performance thermal insulation materials, and the obtained SiZrOC NFMs are promising high-temperature thermal insulation materials.

对于高温绝热应用，非常需要具有优异的热稳定性和低导热率的陶瓷纳米纤维。然而，高温下的热稳定性和低导热率的不相容性在很大程度上限制了常规单相陶瓷纳米纤维的实际使用。在这里，我们报告通过电纺技术制备由非晶SiOC和ZrO ₂纳米晶体组成的多相SiZrOC纳米纤维膜（NFM）。制成的SiZrOC NFM在N _2中表现出极好的高温稳定性（在Ar中约为1200°C）和低导热率（在1000°C中约为0.1392 W m ^-1 K ^-1））。降低的热导率是通过协同机制实现的，即多相界面和ZrO ₂纳米晶体会形成传热壁垒以减少传热，而SiOC相则有效地抑制了辐射传热。非晶态SiOC和ZrO ₂纳米晶体的这种独特组合为制备高性能绝热材料提供了一种新颖的策略，并且所获得的SiZrOC NFM是有前途的高温绝热材料。