Abstract
In practical applications, thermal protection demands materials with reliable structural stability under extreme conditions. Phenolic aerogels exhibit remarkable thermal protection capabilities; however, their inherent brittleness and porous structure make them susceptible to catastrophic failure when subjected to mechanical stresses or thermal oxidation. To address this, robust phenolic composite (PFR@SiO2) aerogels were synthesized through a three-step process involving sol-gel generation, ambient-pressure drying, and chemical vapor deposition. The resulting PFR@SiO2 aerogels display impressive mechanical properties, as well as a high degree of flame resistance. Furthermore, under fatigue stress/strain cycling tests or ultrahigh-temperature oxidation circumstance, such phenolic composite aerogels also exhibit exceptional structural stability. Overall, these combined properties position the PFR@SiO2 aerogels as a promising material system for robust thermal superinsulation under extreme conditions.
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