Dey, Atanu and Kayal, Nijhuma and Chakrabarti, Omprakash (2011) Preparation of mullite bonded porous SiC ceramics by an infiltration method. Journal of Materials Science, 46 (16). pp. 5432-5438. ISSN 0022-2461

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Abstract

A powder compact of alpha-SiC and alpha-Al(2)O(3) was infiltrated with a liquid precursor of SiO(2), which on subsequent heat treatment at 1500 A degrees C produced a mullite bonded porous SiC ceramics. Results showed that infiltration rate could be estimated by using weight gain measurements and theoretical analysis. The bond phase was composed of needle-shaped mullite which was observed to be grown from a siliceous melt formed during the process of oxide bonding. The porous SiC ceramics exhibited a density and porosity of 2 g cm(-3) and 30 vol%, respectively, and also a pore size distribution in a range of 2-15 mu m with an average pore size of 5 mu m. No appreciable degradation of room temperature flexural strength (51 MPa) was observed at high temperatures (1100 A degrees C).

Item Type:	Article
Subjects:	Processing Science
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Jan 2012 12:10
Last Modified:	31 Jan 2013 11:32
URI:	http://cgcri.csircentral.net/id/eprint/208

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