Affiliation:
1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Innovation Center for Textile Science and Tehnology Donghua University Shanghai 201620 China
Abstract
AbstractThermal insulation under extreme conditions requires the materials to be capable of withstanding complex thermo‐mechanical stress, significant gradient temperature transition, and high‐frequency thermal shock. The excellent structural and functional properties of ceramic aerogels make them attractive for thermal insulation. However, in extremely high‐temperature environments (above 1500 °C), they typically exhibit limited insulation capacity and thermo‐mechanical stability, which may lead to catastrophic accidents, and this problem is never effectively addressed. Here, a novel ceramic meta‐aerogel constructed from a crosslinked nanofiber network using a reaction electrospinning strategy, which ensures excellent thermo‐mechanical stability and superinsulation under extreme conditions, is designed. The ceramic meta‐aerogel has an ultralow thermal conductivity of 0.027 W m–1 k–1, and the cold surface temperature is only 303 °C in a 1700 °C high‐temperature environment. After undergoing a significant gradient temperature transition from liquid nitrogen to 1700 °C flame burning, the ceramic meta‐aerogel can still withstand thousands of shears, flexures, compressions, and other complex forms of mechanical action without structural collapse. This work provides a new insight for developing ceramic aerogels that can be used for a long period in extremely high‐temperature environments.
Funder
National Natural Science Foundation of China
Program of Shanghai Academic Research Leader
Natural Science Foundation of Shanghai Municipality
Cited by
2 articles.
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