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Phase evolution and densification of spray pyrolysed ZrO2-Al2O3 powders

Gandhi, AS and Jayaram, V and Chokshi, AH (1997) Phase evolution and densification of spray pyrolysed ZrO2-Al2O3 powders. In: Materials Science Forum, 243 . 227-232 .

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Abstract

Devitrification of spray pyrolysed, amorphous ZrO2-Al2O3 solid solution produces nanocrystalline microstructures (grain sizes 10-20 nm). In this study, spray pyrolysed amorphous ZrO2-40 mol% Al2O3 powder displayed good sinterability during decomposition, after spraying, of the nitrate precursors up to 1023K. Hot pressing of fully pyrolysed, pre-sintered (more than 70% dense) pellets at 923K and 750 MPa produced an amorphous pellet with less than 2% porosity. The results indicate the possibility of producing dense, amorphous pellets that can be heat treated further to produce nanocrystalline microstructures conducive for superplasticity.

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to Trans Tech Publications Inc.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 02 Jul 2011 06:52
Last Modified: 02 Jul 2011 06:52
URI: http://eprints.iisc.ernet.in/id/eprint/38351

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