High-performance thermally insulating ceramic materials with excellent mechanical and thermal insulation properties are essential for thermal management in extreme environments. In this work, SiO2 was introduced into the crystalline lattice and grain boundary of TiO2 to inhibit its phase transition and grain growth. Meanwhile, layered TiO2/SiO2 nanofiber membranes (TS NFMs) were designed and prepared. The TS NFMs had lightweight (44 mg/cm3), high tensile strength (4.55 MPa), ultra-flexibility, and low thermal conductivity (31.5 mW·m−1·K−1). The prepared TS-1100 NFMs had excellent buckling fatigue resistance, which could undergo 100 buckling-recovery cycles at up to 80% strain. Low density and high diffuse reflectance endow the TS NFMs with excellent thermal insulation effects. A single-layer nanofiber membrane was composed of multiple layers of nanofibers. According to the principle of multi-level reflection, the multilayer structure had a better near-infrared reflection effect. Through the stacking effect of layers, a 10 mm thick sample composed of about 300 layers of nanofiber membranes could reduce the hot surface temperature from 1,200 °C to about 220 °C, demonstrating an excellent comprehensive thermal insulation effect. The layered TS NFMs with ultra-flexibility, high tensile strength and high-temperature resistance (1,100 °C) provide a dominant pathway in producing materials in extremely high-temperature environments.

中文翻译：

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用于隔热的具有层状结构的超柔性 TiO2/SiO2 纳米纤维膜


具有优异机械和隔热性能的高性能隔热陶瓷材料对于极端环境中的热管理至关重要。在这项工作中，将 SiO2 引入 TiO2 的晶格和晶界中，以抑制其相变和晶粒生长。同时，设计并制备了层状 TiO2/SiO2 纳米纤维膜 （TS NFM）。TS NFMs 具有重量轻 （44 mg/cm3）、高拉伸强度 （4.55 MPa）、超柔韧性和低导热率 （31.5 mW·m−1·K−1）。制备的 TS-1100 NFM 具有优异的抗屈曲疲劳性能，可在高达 80% 的应变下进行 100 次屈曲恢复循环。低密度和高漫反射率赋予了 TS NFM 出色的隔热效果。单层纳米纤维膜由多层纳米纤维组成。根据多级反射原理，多层结构具有较好的近红外反射效果。通过层的堆叠效应，由约 300 层纳米纤维膜组成的 10 mm 厚样品可以将热表面温度从 1,200 °C 降低到约 220 °C，表现出优异的综合隔热效果。层状 TS NFM 具有超柔韧性、高拉伸强度和耐高温性 （1,100 °C），为在极端高温环境中生产材料提供了主要途径。