Dey, Atanu and Kayal, Nijhuma and Chakrabarti, Omprakash (2011) Preparation of porous SiC ceramics by an infiltration technique. Ceramics International, 37 (1). pp. 223-230. ISSN 0272-8842

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Abstract

The possibility of infiltration as a technique for synthesizing porous SiC ceramics was examined. SiC powder compacts were infiltrated with a liquid precursor which produced SiO(2) during pyrolysis in air at a low temperature. Infiltrated SiO(2) might act as a bond between the neighboring SiC particles at contacting points. The process parameters which control the rate of infiltration of liquid precursor to SiO(2) into porous SiC powder compacts were studied. Results showed that the infiltration rate could be estimated by using weight gain measurements. Sintering infiltrated bodies at 1300 degrees C yielded specimens in which only silicon carbide and cristobalite were detected. The presence of cristobalite significantly controlled the porosity as also the mechanical properties. Reasonable flexural strengths (similar to 48 MPa) could be achieved at a porosity level of 26 vol.% with near uniform pore diameter of around 5 mu m. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	SiC Ceramics; Porous material; Infiltration; Silica sol
Subjects:	Processing Science
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Jan 2012 12:05
Last Modified:	31 Jan 2013 11:30
URI:	http://cgcri.csircentral.net/id/eprint/92

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