Highly Oriented SiC@SiO2 Ceramic Fiber Aerogels with Good Anisotropy of the Thermal Conductivity and High‐Temperature Resistance

Highly Oriented SiC@SiO2 Ceramic Fiber Aerogels with Good Anisotropy of the Thermal Conductivity and High‐Temperature Resistance

Abstract Here electrospinning and freeze‐drying techniques are combined to fabricate an anisotropic SiC@SiO2 ceramic fiber aerogels (A‐SiC@SiO2‐FAs). The anisotropic structure of the A‐SiC@SiO2‐FAs features aligned layers stacking layer‐by‐layer with the same direction and highly oriented 1D fibers...

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Bibliographic Details
Main Authors: Zheng Zhang, Cui Liu, Nian Li, Wei Guo, Ying Li, Pengzhan Yang, Shudong Zhang, Zhenyang Wang
Format: Article
Language:English
Published: Wiley 2025-05-01
Series:Advanced Science
Subjects:
anisotropy
high‐temperature insulation
SiC@SiO2 nanofiber aerogels
ultra‐low thermal conductivity
Online Access:https://doi.org/10.1002/advs.202416740
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Summary:Abstract Here electrospinning and freeze‐drying techniques are combined to fabricate an anisotropic SiC@SiO2 ceramic fiber aerogels (A‐SiC@SiO2‐FAs). The anisotropic structure of the A‐SiC@SiO2‐FAs features aligned layers stacking layer‐by‐layer with the same direction and highly oriented 1D fibers inside each layer. The A‐SiC@SiO2‐FAs exhibit anisotropic thermal properties with an extremely low thermal conductivity of 0.018 W m−1 K−1 in the transverse direction (perpendicular to the SiC@SiO2 nanofibers) and ≈5 times higher thermal conductivity of 0.0914 W m−1 K−1 in the axial direction due to the highly oriented SiC@SiO2 nanofibers. The anisotropy factor of the A‐SiC@SiO2‐FAs is as high as 5.08, which exceeds most of the currently reported thermal insulation materials with anisotropic structural design, such as anisotropic wood aerogels, biaxially anisotropic PI/BC aerogels and anisotropic MXene foam, etc. The A‐SiC@SiO2‐FAs also have excellent thermal stability, maintaining structural integrity in oxidative environments at temperatures up to 1300 °C. Moreover, these structurally distinct A‐SiC@SiO2‐FAs result in superior elastic deformation with a radial recoverable strain exceeding 60% and an axial specific modulus of 5.72 kN m kg−1. These findings emphasize the potential of SiC nanofiber aerogels in extreme thermal environments and provide valuable insights for designing anisotropic insulation materials.
ISSN:2198-3844

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