SiO₂/SiC Composite Aerogels: Controlled Fabrication, Structure-Property Relationships, and Multifunctional...

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Traditional silicon dioxide (SiO2) aerogels exhibit excellent thermal insulation but suffer from brittleness and poor high-temperature stability.
• Silicon carbide (SiC) possesses superior mechanical properties and high-temperature resistance, making it an ideal component to enhance SiO2 aerogels.

Purpose of the Study:

• To systematically review the preparation strategies for SiO2/SiC composite aerogels.
• To analyze the impact of different preparation methods on material properties.
• To explore the diverse applications of these advanced composite aerogels.

Main Methods:

• Sol-gel techniques
• Carbothermic reduction
• Cryogenic casting
• Chemical vapor deposition
• Electrospinning

Main Results:

• SiO2/SiC composite aerogels combine the low density and thermal insulation of SiO2 with the mechanical robustness and thermal stability of SiC.
• Preparation methods significantly influence microstructure, mechanical strength, thermal conductivity, and microwave absorption.
• These composites demonstrate potential in high-temperature insulation, electromagnetic wave absorption, catalyst support, and adsorption separation.

Conclusions:

• SiO2/SiC composite aerogels represent a significant advancement over traditional SiO2 aerogels, overcoming key limitations.
• Further research into preparation techniques and application-specific optimization is crucial for their widespread engineering adoption.
• These materials hold promise for next-generation thermal management and functional material applications.