Porous Al2O3-Spinel Based Polycrystals That Resist FreeSintering

Shah, Sandeep R and Chokshi, Atul H and Raj, Rishi (2008) Porous Al2O3-Spinel Based Polycrystals That Resist FreeSintering. In: Journal of the American Ceramic Society, 91 (10). pp. 3451-3454.

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Abstract

We show that increasing MgO content in Al2O3 from 0.25 to 10 wt% has a remarkable effect on the sintering behavior. While 0.25 wt% specimens sinter to near full density, the higher weight percent sample could be sintered to a maximum of 92% relative density even when held for 24 h at 1673 K. The resistance of the pores to sintering is ascribed to a reduction in the driving force for sintering (rather than to kinetics). The volume fraction of the pores increases with the fraction of the spinel phase, which forms by a reaction between magnesia and alumina. These findings raise the promise of membranes that can be tailored for pore size and pore volume, for high temperature applications.

Item Type:	Journal Article
Additional Information:	Copyright for this article belongs to John Wiley and Sons.
Keywords:	Powder Compacts; Grain-Growth; Alumina; Deformation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Oct 2009 07:53
Last Modified:	19 Sep 2010 04:52
URI:	http://eprints.iisc.ernet.in/id/eprint/16511

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