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

doi:10.1016/j.jmst.2023.06.006

Abstract

Abstract: Considering the challenge of aerodynamic heating, the development of high-performance insulating ceramic materials with lightweight and low thermal conductivity is crucially important for aerospace vehicles 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 88.1 μm) 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 conductivity 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 × 10³ 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.

Key words: Thermal insulation, Light weight, Macro-porous ceramics, SiOC

Zhuoqing Zhang, Jinghan Li, Lei Cao, Yu Shi, Huajie Yang, Rui Yang, Fan Xie, Xing Zhang. Biomimetic porous silicon oxycarbide ceramics with improved specific strength and efficient thermal insulation[J]. J. Mater. Sci. Technol., 2023, 168: 185-193.

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