| 초록 |
Hierarchically porous ceramics have superior properties in comparison with conventional porous ceramic. Primarily, ceramics with aligned macropores can be used in many applications. Freeze-casting is one of the best methods to fabricate aligned macropores. In addition, Polysilazane (PSZ), one of the preceramic polymers, has received attention as a material for manufacturing porous ceramics because of the easy formation of pores during pyrolysis steps. However, PSZ must undergo a crosslinking to increase ceramic yield and improve structural stability. This study manufactured hierarchically silicon carbonitride (SiCN) ceramics using silsesquiazane (SSQZ) and freeze casting method. SSQZ could be obtained in solid form due to its branched structure, resulting in improving structural stability without additional crosslinking. In addition, we used organic polymers as a binder to further enhance the stability and successfully fabricated hierarchically porous SiCN monolith. |
