Stabilized Zirconia Nanoceramics Prepared by Magnetic Pulsed Compaction of Nanosized Powders

• Published in: Glass physics and chemistry 2005-07, Vol.31 (4), p.465-470
• Main Authors: Ivanov, V. V., Khrustov, V. R., Paranin, S. N., Medvedev, A. I., Shtol’ts, A. K., Ivanova, O. F., Nozdrin, A. A.
• Format: Article
• Language: English
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1007/s10720-005-0084-y

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-Al^sub 2^O^sub 3^ [arrow right] α-Al^sub 2^O^sub 3^ are shifted to the high-temperature range, the density and microhardness of the final ceramics slightly decrease, and the size of α -Al^sub 2^O^sub 3^ 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[PUBLICATION ABSTRACT]