Carbonaceous ceramic nanofibrous aerogels for high-temperature thermal superinsulation  

作　　者：Shubin Fu Dizhou Liu Yuanpeng Deng Jingran Guo Han Zhao Jian Zhou Pengyu Zhang Hongxuan Yu Shixuan Dang Jianing Zhang Hui Li Xiang Xu 

机构地区：[1]Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Nano Research》2023年第4期5047-5055,共9页纳米研究（英文版）

基　　金：the Creative Research Groups of the National Natural Science Foundation of China(No.51921006);the Heilongjiang Touyan Innovation Team Program of China.X.X.acknowledges funding from the National Natural Science Foundation of China(No.51878227).

摘　　要：Ultralight ceramic aerogels are attractive thermal superinsulating materials,but display a formidable tradeoff between low and high temperature thermal conductivity(κ)due to their low-density features.Embedding carbon species as infrared opacifier in ultralight ceramic aerogels can substantially reduce the thermal radiation heat transfer without compromising the ultralow solid conduction.However,the oxidation resistance of embedded carbon species still remains inadequate to prevent thermal etching at high temperatures.Herein,we report a carbonaceous design and synthesis of ceramic nanofibrous aerogels with amorphous carbon embedded in the yttrium-stabilized zircon nanofibers to achieve a high-temperature thermal superinsulating performance with robust thermomechanical stability.The aerogels display one of the lowestκof 95 mW·m^(−1)·K^(-1)at 1,000℃in air among ultralight material family,as well as robust mechanical flexibility with up to 95%compressive strain,30%non-linear fracture strain,and 99%bending strain,and high thermal stability with ultralow strength degradation less than 1%after sharp thermal shocks(240℃·s^(-1))and working temperature up to 1,200℃.The combined high-temperature thermal superinsulating and thermomechanical properties offer an attractive material system for robust thermal insulation under extreme conditions.

关 键 词：carbonaceous ceramic aerogels radiation opacification thermal insulation mechanical flexibility thermal stability 

分 类 号：TQ427.2[化学工程]