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Densification studies on amorphous $ZrO_2-Al_2O_3$ powders

Gandhi, AS and Jayaram, V and Chokshi, AH (1999) Densification studies on amorphous $ZrO_2-Al_2O_3$ powders. In: Proceedings of Creep Behavior of Advanced Materials for the 21st Century. TMS Annual Meeting, 28 Feb.-4 March 1999, San Deigo, CA, USA, pp. 369-378.

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Abstract

Densification characteristics of amorphous $ZrO_2$-40 mol% $Al_2O_3$ powder with 3 to 15 μm nominal particle size range, produced by spray pyrolysis, have been studied by conducting hot pressing experiments at 573, 723 and 873 K with uniaxial pressures of 250, 500 and 750 MPa. Most of the increase in relative density from the starting value of ~40% occurred during loading up to the desired pressure. The increments in density during 1 hour constant pressure dwells were less than 4% at all temperatures and pressure. Inter-particle bonding was not observed at 573 K. Correlation between the results with a viscous sintering model for hot pressing is not satisfactory for describing the behavior as normal viscous sintering

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to TMS - Minerals Metals & Materials Society
Keywords: alumina;amorphous state;ceramics;densification;density;hot pressing;particle size;powder technology;powders;pyrolysis;sintering;spray coating techniques;zirconium compounds
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 24 Jul 2007
Last Modified: 27 Aug 2008 12:42
URI: http://eprints.iisc.ernet.in/id/eprint/10281

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