Baitalik, Sanchita and Kayal, Nijhuma and Chakrabarti, Omprakash (2017) Processing and properties of porous SiC ceramics prepared by yttrium aluminum garnet infiltration. International Journal of Applied Ceramic Technology, 14 (4). pp. 652-664. ISSN 1546-542X

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Abstract

Oxide bonded porous SiC ceramics were synthesized by infiltrating a liquid precursor of yttrium aluminum garnet into porous powder compact of SiC followed by sintering at 1300-1500 degrees C in air. Infiltration rate was estimated using weight gain by the liquid precursor sol into porous SiC powder compact as a function of time and was explained by Darcy's and Ficks's laws. The effects of SiC particle sizes and sintering temperatures on the formation of bonding phases, microstructure, SiC oxidation degree, flexural strength, porosity, and pore size distribution of porous SiC ceramics were studied. Various crystalline oxide phases were detected by XRD analysis. Depending on the starting SiC powder sizes and sintering temperatures, the porosity of the final ceramics varied nearly in the range of similar to 29-41 vol. % with the variation of average pore diameter between similar to 5 and 30m. Flexural strength varied from 41 to 8MPa depending on porosity. The effect of corrosion on oxide bond phases was investigated in strong acidic and basic medium at 90 degrees C. The ceramics showed better corrosion resistance in acidic medium compared to basic medium. In basic medium, significant reduction in flexural strength (similar to 42%) was arisen.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	19 Jan 2018 07:03
Last Modified:	19 Jan 2018 07:03
URI:	http://cgcri.csircentral.net/id/eprint/3981

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