About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Powder and Ceramic Materials Science
|
Presentation Title |
Low-temperature Pathways to Porous SiC Solids |
Author(s) |
Laura Quinn, Taijung Kuo, Katherine T. Faber |
On-Site Speaker (Planned) |
Katherine T. Faber |
Abstract Scope |
Solution-based freeze casting of preceramic polymers, such as polysiloxane or polycarbosilane, has been found to provide a powerful method to produce highly tailorable porous Si-based ceramics. The resulting ceramics from preceramic polymers are known to be amorphous to temperatures of 1000°C to 1800°C, and a devitrification step, which can be accomplished as part of the pyrolysis stage during freeze casting, still fails to induce complete crystallization. In this presentation, potential routes of conversion of preceramic polymers to crystalline SiC that can be embedded into freeze-casting processes will be described. As one illustration, our work seeks to translate chemistries used previously in additive manufacturing to freeze casting. In this procedure, a solution of polysiloxane and polymerization agents undergoes a UV-induced photopolymerization around frozen solvent crystals. This UV-induced photopolymerization allows the liquid polycarbosilane to retain the shape of the solvent crystals after the solvent has been sublimed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, High-Temperature Materials, Other |