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Sintering and Microstructural Investigations on Combustion Processed Mullite

Gopi, Chandran R and Chandrashekar, BK and Ganguly, C and Patil, KC (1996) Sintering and Microstructural Investigations on Combustion Processed Mullite. In: Journal of the European Ceramic Society, 16 (8). pp. 843-849.

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Abstract

Various grades of mullite have been prepared by the combustion route using different fuels and silica sources of the redox mixture. Sintering behaviour and microstructure of combustion processed mullite have been investigated. Pure mullite sintered at 1650°C showed 3% shrinkage and was porous. The microstructure shows the presence of equiaxed grains. Hot isostatic pressing (100 MPa, l500°C, 30 min) followed by sintering at I7OO°C yielded >95% theoretical density. Mullite with 5 wt% of $Y_2O_3$, or MgO sintered at 1650°C achieved high density (\approx95% theoretical density) with a shrinkage of 18 and 22% respectively. The microstructure showed the presence of anisotropic elongated mullite grains and corundum particles. The enhanced densi-Jication of mullite with additives is attributed to the formation of liquid phase which facilitates diffusion.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 12 Dec 2006
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/9074

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