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- Title
Foam-gelcasting preparation of porous SiC ceramic for high-temperature thermal insulation and infrared stealth.
- Authors
Liu, Xue-Feng; He, Jiang-Feng; Li, Ya-Ge; Li, Hang; Lei, Wen; Jia, Quan-Li; Zhang, Shao-Wei; Zhang, Hai-Jun
- Abstract
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 °C), 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.
- Publication
Rare Metals, 2023, Vol 42, Issue 11, p3829
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-023-02348-3