Preparation and characterization of precursor powders for yttria-doped tetragonal zirconia polycrystals (Y-TZP) and Y-TZP-Al2O3 composites |
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Authors: | S Rajendran H J Rossell J V Sanders |
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Affiliation: | (1) Division of Materials Science and Technology, CSIRO, Locked Bag 33, 3168 Clayton, Victoria, Australia |
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Abstract: | 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 1200° C was studied
using differential thermal analysis. X-ray diffraction and transmission electron microscopy methods, and measurements of surface
area. The uncalcined powder was essentially amorphous. On heating alumina-free powder, zirconia crystallized at 485° C: for
increasing alumina content, zirconia crystallized from an amorphous aluminous matrix at increasing temperatures (850° C for
20 wt% Al2O3), while the crystallite size decreased and the surface area of the powder increased. The zirconia first crystallized as cubic,
but transformed to the tetragonal form near 1100° C. The alumina crystallized as corundum at 1200° C. No monoclinic zirconia
could be detected when calcined aluminous material was cooled to room temperature. The sintering behaviour of the calcined
powder is discussed. |
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