Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

As a type of ultra-light and super thermal insulation solid-state porous materials, aerogels have attracted increasing attention for aerospace, transportation, and building insulation applications.However, when aerogels are applied in these fields, resistance to high temperatures is a prerequisite for them.The most traditional silica aerogels can resist up to 600 o C, but their porous structures are destroyed at higher temperatures and no longer possess excellent thermal insulation capacity and low density.Though a significant number of new aerogels have been reported in the past two decades, the number of aerogels that could resist ultra-high temperatures, e.g.,>800 o C, is relatively few.Nevertheless, it's exciting to see that more and more aerogels that can resist temperatures higher than 1000 ℃, and even up to 1500 o C, have been reported in the past few years.This paper gives an overview of aerogels that could resist more than 800 o C, and they defined as high-temperature resistant aerogels (HTRAs) in this review.The synthetic strategies, mechanisms, chemical compositions, and specific applications of the HTRAs will be reviewed and discussed.This paper would be a timely review to summarize the most recent progress in the HTRAs, and provide insights into the designing of various HTRAs.