Dense nanometric ZrO2---Al2O3 from spray-pyrolysed powders

Jayaram, V and Mishra, RS and Majumdar, B and Lesher, C and Mukherjee, A (1998) Dense nanometric ZrO2---Al2O3 from spray-pyrolysed powders. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 133 (1-2). pp. 25-31.

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Abstract

Powders of ZrO2-Al2O3 synthesized by spray pyrolysis of aqueous solutions of nitrates have been subjected to high-pressure rapid-heating compaction at 700-900 degrees C. The original amorphous phase undergoes decomposition during heat treatment via a series of metastable crystalline solid solutions to the equilibrium phases of monoclinic ZrO2 and alpha-alumina. The application of high pressure results in a substantial decrease in the temperature required for each transformation. Maximum densification during pressure-assisted sintering appears to occur at the lowest temperature (700 degrees C), in which the predominant phase is a tetragonal ZrO2-Al(2)AO(3) solid solution, with a small amount of partitioned gamma-alumina. Under these optimum conditions, the crystallite size is 10-20 nm With no evidence of porosity

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	nanocrystalline;spray-pyrolysed;ZrO2-Al2O3;high pressure; sintering.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Mar 2009 18:06
Last Modified:	19 Sep 2010 05:01
URI:	http://eprints.iisc.ernet.in/id/eprint/18368

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