Browse > Article
http://dx.doi.org/10.3740/MRSK.2016.26.6.320

Preparation of Porous SiC by Freeze Drying of Polycarbosilane Emulsion  

Hwang, Yeon (Department of Materials Science & Engineering, Seoul National University of Science & Technology)
Publication Information
Korean Journal of Materials Research / v.26, no.6, 2016 , pp. 320-324 More about this Journal
Abstract
Porous SiC beads were prepared by freeze-drying a polycarbosilane (PCS) emulsion. The water-in-oil (w/o) emulsion, which was composed of water, PCS dissolved p-xylene, and sodium xylenesulfonate (SXS) as an emulsifier, was frozen by dropping it onto a liquid $N_2$ bath; this process resulted in 1~2 mm sized beads. Beads were cured at $200^{\circ}C$ for 1 h in air and heat-treated at $800^{\circ}C$ and $1400^{\circ}C$ for 1 h in an Ar gas flow. Two types of pores, lamella-shaped and spherical pores, were observed. Lamellar-shaped pores were found to develop during the freezing of the xylene solvent. Water droplets in the w/o emulsion were changed into spherical pores under freeze-drying. At $1400^{\circ}C$ of heat-treatment, porous SiC was synthesized with a low level of impurities.
Keywords
polycarbosilane; porous SiC; freeze-drying; polymer emulsion;
Citations & Related Records
연도 인용수 순위
  • Reference
1 T. G. Mason, J. N. Wilking, K. Meleson, C. B. Chang and S. M. Graves, J. Phys.: Condens. Matter., 18, R635 (2006).   DOI
2 S. Sajjadi, M. Zerfa and B. W. Brooks, Colloid Surf. A, 218, 241 (2003).   DOI
3 B. H. Yoon, E.J. Lee, H. E. Kim and Y. H. Koh, J. Am. Ceram. Soc., 90, 1753 (2007).   DOI
4 P. van de Witte, P. J. Dijkstra, J. W. A. van den Berg and J. Feijen, J. Membr. Sci., 117, 1 (1996).   DOI
5 C. Y. Gao, A. Li, L. X. Feng, X .S. Yi and J. C. Shen, Polym. Int., 49, 323 (2000).   DOI
6 P. Colombo, G. Mera, R. Riedel and G. D. Soraru, J. Am. Ceram. Soc., 93, 1805 (2010).
7 G. Mera, A. Navrotsky, S. Sen, H-J. Kleebe and R. Riedel, J. Mater. Chem. A, 1, 3826 (2013).   DOI
8 J. Zeschky, T. Hofner, C. Arnold, R. Weissmann, D. Bahloul-Hourlier, M. Scheffler and P. Greil, Acta Mater., 53, 927 (2005).   DOI
9 C. Vakifahmetoglu, P. Colombo, A. Pauletti, C. F. MartinF and F. Babonneau, Int. J. Appl. Ceram. Technol., 7, 528 (2010).
10 C. Wang, J. Wang, C. B. Park and Y. W. Kim, J. Ceram. Proc. Res., 10, 238 (2009).
11 M. Shibuya, T. Takahashi and K. Koyama, Compos. Sci. Technol., 67, 119 (2007).   DOI
12 L. Biasetto, A. Francis, P. Palade, G. Principi and P. Colombo, J. Mater. Sci., 43, 4119 (2008).   DOI
13 R. A. White, E. W. White and J. N. Weber, Science, 176, 922 (1972).   DOI
14 V. Bakumov, M. Schwarz and E. Kroke, J. Eur. Ceram. Soc., 29, 2857 (2009).   DOI
15 R. Frind, M. Oschartz and S. Kaskel, J. Mater. Chem., 21, 11936 (2011).   DOI
16 C. Vakifahmetoglu, M. Balliana and P. Colombo, J. Eur. Ceram. Soc., 31, 1481 (2011).   DOI