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Detailed Program
Paper Number : ST-O12
Time Frame : 15:30~15:50
Presentation Date : Friday, 28, November
Session Name : Structual Ceramics & Refractory materials
Session Chair 1# : Do-kyung Kim
Session Chair 2# : Masaki Narisawa
Synthesis of Meso-Macro Porous ¥â-SiC by a Direct Reaction between Metallic Si and Carbon
Sang Whan PARK
Korea institute of Science and Technology
Keywords: Porous SiC, Direct reaction, Meos-macro porous, carburization

It has been known that porous SiC has many excellent properties such as stability at high temperature, high chemical resistance, and high termal conductivity. Importance of the meso-macro porous SiC with high surface area has been increased for the use of the catalyst support under harsh conditions such as hydro desulfurization as well as high thermal conductive catalyst support for the gas reforming. In this study, meso-macro porous SiC bodies were fabricated by a direct reaction between metallic Si and carbon black in Si-C green body. The ¥â -SiC were synthesized by carburizing Si-C preforms with various C/Si mole ratios at the temperature of 1200 ~ 1300oC under vacuum and/or in Ar atmosphere. In addition, the effects of Ni as a catalyst were studied on the synthesis temperature as well as the pore characteristics of meso-macro porous SiC bodies. The crack free Meso-macro porous SiC bodies were successfully synthesized by a direct Si-C reaction with additional processes to remove residual Si and C. It was found that Ni catalyst reduced the synthesis temperature as shown in Fig. 1. BET surface area of synthesized meso-macro porous SiC were varied from 25 to 60 m2/g depending on the synthesis temperature and C/Si mole ratios of C/Si preform. The compressive strengths of the synthesized meso-macro porous SiC bodies were found to be dependent on the synthesis temperature and C/Si mole ratios of Si-C green body.

References:

[1] Zhicheng Liu, etal. Microporous and Mesoporous Materials 82(2005) p.137
[2] Guo-Qiang Jin, etal. Microporous and Mesoporous Materials 60 (2003) p. 207
Acknowledgements : This study was financially supported by KIST Institute own program.