Highly Aligned Porous Silicon Carbide Ceramics by Freezing Polycarbosilane/Camphene Solution

• Published in: Journal of the American Ceramic Society Vol. 90; no. 6; pp. 1753 - 1759
• Main Authors: Yoon, Byung-Ho, Lee, Eun-Jung, Kim, Hyoun-Ee, Koh, Young-Hag
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.06.2007; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Ceramic sintering; Ceramics; Chemical industry and chemicals; Exact sciences and technology; Fluids; Freezing; Materials science; Miscellaneous; Sintering; Technical ceramics; Scanning electron microscopy; Chemical solution; Polysilane; Organic polymers; Experimental study; Porous material; Freezing; Non oxide ceramics; Alignment; Camphene; Silicon carbide; Technical ceramics; Manufacturing; Fourier-transformed infrared spectrometry
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2007.01703.x

We fabricated highly aligned porous silicon carbide (SiC) ceramics with well‐defined pore structures by freezing a polycarbosilane (PCS)/camphene solution. In this method, the solution prepared at 60°C was cast into a mold at temperatures ranging from 20° to −196°C, which resulted in a bicontinuous structure, in which each phase (camphene or PCS) was interconnected in a regular pattern. After the removal of the frozen camphene network, the samples showed highly porous structures, in which long straight and short elongated pore channels were formed parallel and normal to the direction of freezing, respectively. Thereafter, porous SiC ceramics were produced by the pyrolysis of the porous PCS objects at 1400°C for 1 h in a flowing Ar atmosphere, while preserving their mother pore structures having aligned pore channels.