Biomimetic porous silicon oxycarbide ceramics with improved specific strength and efficient thermal insulation  

作　　者：Zhuoqing Zhang Jinghan Li Lei Cao Yu Shi Huajie Yang Rui Yang Fan Xie Xing Zhang 

机构地区：[1]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [3]School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China [4]Shenyang Aircraft Design and Research Institute,Shenyang 110035,China

出　　处：《Journal of Materials Science & Technology》2024年第1期185-193,共9页材料科学技术（英文版）

基　　金：supported by the CAS Interdisciplinary Innova-tion Team Project(No.JCTD-2020-10)of the Chinese Academy of Sciences;China and the Defense Industrial Technology Develop-ment Program(No.JCKY2021130B039).

摘　　要：Considering the challenge of aerodynamic heating,the development of high-performance insulating ce-ramic materials with lightweight and low thermal conductivity is crucially important for aerospace vehi-cles to achieve flight at high speed for a long time.In this work,macro-porous silicon oxycarbide(SiOC)ceramics with directional pores(DP-SiOC)(mean pore size of 88.1μm)were prepared using polysiloxane precursors via freeze casting and photocrosslinking,followed by pyrolysis.The DP-SiOC samples were lightweight(density∼0.135 g cm^(-3))with a porosity of 90.4%,which showed good shapability through the molding of polysiloxane precursors.The DP-SiOC samples also exhibited an ultra-low thermal con-ductivity of 0.048 W(m K)^(-1)at room temperature,which can also withstand heat treatment at 1200°C for 1 h.In addition,scaffolds with triply periodic minimal surfaces(TPMS)were fabricated using digital light processing(DLP)printing,which was further filled with polysiloxane precursors for increasing the strength of DP-SiOC.The TPMS scaffolds filled with macro-porous SiOC ceramics(TPMS-DP-SiOC)showed good integration between TPMS and macro-pore structures,which had a porosity∼75%and high specific strength of 9.73×10^(3)N m kg^(-1).The thermal conductivity of TPMS-DP-SiOC samples was 0.255 W(m K)^(-1)at room temperature.The biomimetic TPMS-DP-SiOC ceramics developed in this study are likely used for thermal protection systems.

关 键 词：Thermal insulation Light weight Macro-porous ceramics SIOC 

分 类 号：O63[理学—高分子化学]