Abstract
Ceramic fibrous materials with good thermal insulation properties are in great demand for the thermal protection of vehicles and spacecraft. Here, ultra-fine flexible Y2Si2O7 fibrous membranes with excellent thermal insulation performance are fabricated via electrospinning followed by high-temperature heat treatment. Benefiting from the ultra-fine fibrous structure, the Y2Si2O7 fibrous membrane was lightweight (∼0.126 g/cm3) and high porosity (97.11%). Meanwhile, the obtained fibrous membranes exhibited low thermal conductivity (∼0.067 W m−1 K−1 at 27 °C, ∼0.299 W m−1 K−1 at 1000 °C), high-temperature resistance (∼1300 °C), excellent flexibility, and good reflectance in the wavelength of 500–2500 nm (average 89.72%). This research demonstrates a novel fabrication process for preparing flexible Y2Si2O7 fibrous membranes, but also the flexible Y2Si2O7 fibrous membranes are promising thermal insulation materials at high temperature.
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