High entropy silicate ceramic aerogels with excellent thermal stability up to 1600℃and their fiber-reinforced composites for high temperature insulationOA
Ceramic aerogels have promising applications in extreme environments,such as aerospace,but are severely limited by the sintering-prone nature of nanounits at high temperatures.However,they typically exhibit inadequate dimensional stability when exposed to high-temperature atmospheres,which can result in the deterioration of their macroscopic characteristics,eventually restricting their applications in extreme environments.Here,a(YYbErDyGd)_(2)SiO_(5)ceramic aerogel(ESA)was prepared at 1050℃by introducing high entropy into a ceramic aerogel,thereby enhancing its high-temperature thermal stability via the high-entropy effect.ESA was exposed to a temperature of 1600℃for 2 h without undergoing sintering.In addition,different fiber-reinforced ceramic aerogel composites are also explored,with a thermal conductivity of only 0.032 W/(m·K)at room temperature and 0.108 W/(m·K)at high temperature of 1000℃.These composites demonstrate no visible damage or deformation under extreme conditions across a substantial temperature range(−196 to 1300℃),a property that is paramount for applications in extreme environments.At 1100–1300℃,after 2 h of calcination,the composites exhibit a shrinkage rate of only 0.25%.After 600 s of butane torch ablation at 1300℃,the back temperature is only 110℃.Moreover,under 60%compression deformation,its maximum compression strength is 0.386 MPa.Even after 20 high-temperature thermal cycles(1300℃for 2 h),the sample maintains a low thermal conductivity of 0.043 W/(m·K)and a compressive strength of 0.259 MPa.This work provides a new perspective for exploring the limits of the strength and thermal properties of ceramic composites in the field of high-temperature insulation,particularly under extreme conditions.
Sisi Shang;Zhun Fan;Jing Fang;Man Yuan;Zihao Song;Wei Liu;Jian Yang;Sheng Cui
State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,ChinaState Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing 211816,China
化学化工
high entropyceramic aerogelthermal stabilitythermal insulation
《Journal of Advanced Ceramics》 2026 (1)
P.143-160,18
supported by the National Natural Science Foundation of China(No.52272300)the Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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