Microstructural Characterization of Porous Silicon Carbide Membrane Support With and Without Alumina Additive

• Published in: Journal of the American Ceramic Society 2006-05, Vol.89 (5), p.1523-1529
• Main Authors: Fukushima, Manabu, Zhou, You, Miyazaki, Hiroyuki, Yoshizawa, Yu-ichi, Hirao, Kiyoshi, Iwamoto, Yuji, Yamazaki, Satoshi, Nagano, Takayuki
• Format: Article
• Language: English
• Subjects: Additives; Alumina; Aluminum oxide; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Membranes; Microstructure; Miscellaneous; Pore size; Porosity; Porous materials; Silicon carbide; Sintering (powder metallurgy); Technical ceramics
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2006.00931.x

Porous silicon carbide (SiC) membrane supports sintered at 1500°–1800°C were prepared by cold isostatic pressing (CIP) under different pressures and using different amounts of alumina additive (0%–4%). The relationship between processing factors and pore size and microstructure was examined. Varying the sintering temperature, the CIP pressure and the amount of additive used were found to be effective for controlling pore size and microstructure. The pore size and particle size of the membrane support prepared without alumina were found to increase with increasing sintering temperature. This was attributed to surface diffusion. Densification of the undoped support did not occur, however, because of concurrent pore development. In the SiC membrane support containing 4% alumina, small particles and a pore size of around 100 nm were retained. This was because of the formation of a limited amount of SiO2–Al2O3 liquid phase during sintering.