Foam-gelcasting preparation of porous Si C ceramic for high-temperature thermal insulation and infrared stealth  

作　　者：Xue-Feng Liu Jiang-Feng He Ya-Ge Li Hang Li Wen Lei Quan-Li Jia Shao-Wei Zhang Hai-Jun Zhang 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan,430081,China [2]Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou University,Zhengzhou,450052,China [3]College of Engineering,Mathematics and Physical Sciences,University of Exeter,Exeter,EX44QF,UK

出　　处：《Rare Metals》2023年第11期3829-3838,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.52072274,52272021 and 52232022)。

摘　　要：Porous SiC ceramics(PSCs)are promising lightweight and efficient thermal insulators that can evade infrared detection by reducing the surface temperature of the protected object,which plays a crucial role in the development of new military equipment.However,the controllable synthesis of PSCs with both hierarchical pore structure and thermal/mechanical stability remains challenging.In this work,such PSCs were prepared by a facile foam-gelcasting/solid-state reaction method,using silicon powders and glucose-derived carbon as starting materials.The favorable dispersibility and wettability of hydrophilic carbon microspheres and the in-situ formed SiC guarantee the highly porous structure(92.8%porosity),comparable bulk density(0.20 g·cm^(-3))and reasonable mechanical property of the product.The designed PSCs performed outstanding high-temperature performance,especially thermal insulation in both oxidizing and inert atmospheres.More importantly,the composite architecture of PSCs and low emissivity layer(Al foil)exhibited desirable infrared stealth property(at a temperature up to 1100℃),significantly extending the operating temperature range of thermal camouflage material.The unique combination of excellent properties would make PSCs a potential candidate material for future thermal protection and infrared stealth applications in an extreme environment.

关 键 词：Porous SiC ceramics Foam-gelcasting Thermal superinsulation High-temperature infrared camouflage 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]