Abstract
Ceramic materials with a fine structure are synthesized from zirconia-based nanopowders through magnetic pulsed compaction and subsequent sintering under different temperature-time conditions. The kinetics of crystallite growth and polymorphic phase transformations are analyzed. Unstabilized zirconia ceramic materials with a density of 96% and a crystallite size of 50 nm are prepared. It is found that, in the case when the ceramic materials with a cubic or tetragonal yttrium-stabilized zirconia (YSZ) matrix are synthesized with small additives of alumina nanopowders, the temperatures of active shrinkage and the polymorphic transformation γ-Al2O3 → α-Al2O3 are shifted to the high-temperature range, the density and microhardness of the final ceramics slightly decrease, and the size of α -Al2O3 crystallites does not exceed 100 nm. It is also established that the alumina additives have no noticeable effect on the growth of crystallites of the YSZ matrix
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