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Strength and Heat of Hydration01:29

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Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
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High-Entropy Ceramic Aerogel with Ultrahigh Thermomechanical Properties.

Duola Wang1,2, Chuanyun Song1,2, Shixuan Dang1,2

  • 1Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, PR China.

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|March 13, 2025
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Summary

This study introduces a high-entropy ceramic aerogel for extreme thermal insulation. The novel material demonstrates remarkable mechanical flexibility and thermal stability up to 1400 °C.

Keywords:
high-entropy ceramiclattice distortionnanofibrous aerogelthermal sealingultrahigh thermomechanical properties

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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Nanotechnology

Background:

  • Extreme-condition thermal insulation requires materials that withstand thermomechanical stress and high temperatures.
  • Conventional ceramic aerogels face challenges like grain growth, shrinkage, and strength degradation at high temperatures.

Purpose of the Study:

  • To develop a novel high-entropy ceramic aerogel with enhanced mechanical and thermal insulation properties for extreme environments.
  • To investigate the relationship between element-phase design and material performance under extreme conditions.

Main Methods:

  • Fabrication of a high-entropy (La1/4Sm1/4Gd1/4Y1/4)2Zr2O7 (ZLSGY) aerogel using an element-phase design.
  • Characterization of mechanical properties (compressive, tensile, bending strains) and thermal conductivity.
  • Evaluation of thermomechanical stability at temperatures up to 1400 °C.

Main Results:

  • The ZLSGY aerogel achieved significant mechanical flexibility with strains of 98% (compressive), 52% (tensile), and 99% (bending).
  • Ultralow thermal conductivity was recorded: 24.79 mW m⁻¹ K⁻¹ at 25 °C and 82.19 mW m⁻¹ K⁻¹ at 1000 °C.
  • Exceptional thermomechanical stability was demonstrated, with <3% strength degradation after 10⁵ high-temperature deformation cycles up to 1400 °C.

Conclusions:

  • The high-entropy ceramic aerogel exhibits superior mechanical and thermal insulation properties suitable for extreme environments.
  • Element-phase design is an effective strategy for enhancing lattice distortion and diffusion, leading to fine-grain strengthening in ceramic aerogels.
  • This material system offers a promising solution for advanced thermal insulation applications.