Preparation and characterization of precursor powders for yttria-doped tetragonal zirconia polycrystals (Y-TZP) and Y-TZP-Al2O3 composites

Precursor powders for the preparation of tetragonal 2.5 mol % Y2O3-ZrO2 containing 0 to 30 wt % Al2O3 were made by coprecipitation. The behaviour of this powder during calcination from room temperature to 1200C was studied using DTA, XRD and TEM methods, and measurements of surface area. The uncalci...

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Published in:Journal of materials science 1989-04, Vol.24 (4), p.1195-1202
Main Authors: RAJENDRAN, S, ROSSELL, H. J, SANDERS, J. V
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Technical ceramics
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description Precursor powders for the preparation of tetragonal 2.5 mol % Y2O3-ZrO2 containing 0 to 30 wt % Al2O3 were made by coprecipitation. The behaviour of this powder during calcination from room temperature to 1200C was studied using DTA, XRD and TEM methods, and measurements of surface area. The uncalcined powder was essentially amorphous. On heating alumina-free powder, zirconia crystallised at 485C: for increasing alumina content, zirconia crystallised from an amorphousaluminous matrix at increasing temperatures (850C for 20 wt % Al2O3), while the crystallite size decreased and the surface area of the powder increased. The zirconia first crystallised as cubic, but transformed to the tetragonal form near 1100C. The alumina crystallised as corundum at 1200C. No monoclinic zirconia could be detected when calcined aluminous material was cooled to room temperature. The sintering behaviour of the calcined powder was discussed. 13 refs.
doi_str_mv 10.1007/BF02397047
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subjects Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Technical ceramics
title Preparation and characterization of precursor powders for yttria-doped tetragonal zirconia polycrystals (Y-TZP) and Y-TZP-Al2O3 composites
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