Paper Titles
Preparation of Porous Ceramic Support with Inorganic Filtration Membrane
p.1099
Preparation of Porous Wollastonite Ceramics for Filtration
p.1102
Fabrication of Porous Silicon Nitride with High Porosity
p.1105
Properties and Application of Oriented Porous SiC as Transpiration Cooling Materials
p.1109
Fabrication of Porous Cellular SiC Ceramics from Wood by Embedding in Si/SiO2 Powder Mixture
p.1113
Study of Affecting Factors on Porosity in Gel-Casting Foam
p.1117
Preparation and Characterization of ZrO2 Microspheres by Internal Gelation Process
p.1121
Preparation and Microstructure of Bauxite Ceramic Microsphere
p.1124
Homogeneity of Aqueous Al2O3/3Y-TZP Feedstock by Plastic Kneading
p.1127

Fabrication of Porous Cellular SiC Ceramics from Wood by Embedding in Si/SiO2 Powder Mixture

Article Preview

Abstract:

Wood has strongly anisotropic cellular structure with 50-80 vol% porosity. It can be converted into porous ceramics (e.g., SiC, SiC/Si, TiC, C/C, and TiO2) replicating the wood structure by various processes. Previously porous cellular SiC ceramic was prepared by reaction of wood charcoal with gaseous SiO generated remotely from an equimolar mixture of Si and SiO2. In the present work, poplar charcoal was simply embedded in the powder mixture of Si and SiO2 and heated at 1600°C for 1 h in Ar to produce porous SiC. Samples were also prepared by infiltration of Si melt (1500-1600°C, 2 h) and vapor (1700°C, 2 h) into the charcoal for comparison. Samples prepared by Si melt infiltration showed 15-52% conversion to SiC. Samples prepared by Si vapor infiltration showed severe damage such that the conversion degree could not be measured. In contrast, samples prepared by the embedding process showed full conversion to SiC (mostly β form) with good retention of the cellular structure of the original wood. The embedding process is a simple and efficient way to produce porous cellular SiC from wood.

You might also be interested in these eBooks
High-Performance Ceramics IV View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Pages:

1113-1116

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.1113

Citation:

Cite this paper

Online since:

April 2007

Authors:

Jung Soo Ha, Byong Gu Lim, Geum Hyun Doh, In Aeh Kang

Keywords:

Cellular Structure, Embedding Process, Porous SiC, Wood

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] K. Ishizaki, S. Komarneni and M. Nanko: Porous Materials: Process technology and applications (Kluwer Academic Publishers, Dordrecht/Boston/London, 1998), p.181.

Google Scholar

[2] Y-W. Kim and C.B. Park: Comp. Sci. Tech. Vol. 63 (2003), p.2371.

Google Scholar

[3] L. Esposito, D. Sciti, A. Piancastelli and A. Bellosi: J. Eur. Ceram. Soc. Vol. 24 (2004), p.533.

Google Scholar

[4] J-M. Qian, J-P. Wang, G-J. Qiao and Z-H. Jin: J. Eur. Ceram. Soc. Vol. 24 (2004), p.3251.

Google Scholar

[5] J-M. Qian, J-P. Wang and Z-H. Jin: Mater. Chem. Phys. Vol. 82 (2003), p.648.

Google Scholar

[6] E. Vogli, H. Sieber and P. Greil: J. Eur. Ceram. Soc. Vol. 22 (2002), p.2663.

Google Scholar

[7] E. Vogli, J. Mukerji, C. Hoffman. R. Kladny, H. Sieber and P. Greil: J. Am. Ceram. Soc. Vol. 84 (2001), p.1236.

Google Scholar

[8] T. Ota, M. Imaeda, H. Takase, M. Kobayashi, N. Kinoshita, T. Hirashita, H. Miyazaki and Y. Hikichi: J. Am. Ceram. Soc. Vol. 83 (2000), p.1521.

DOI: 10.1111/j.1151-2916.2000.tb01421.x

Google Scholar

[9] T. Ota, M. Takahashi, T. Hibi, M. Ozawa, S. Suzuki and Y. Hikichi: J. Am. Ceram. Soc. Vol. 78 (1995), p.3409.

Google Scholar

[10] K.J. Duchow and R.A. Gerhardt: Mater. Sci. Eng. C Vol. 4 (1996) p.125.

Google Scholar