Rev.Adv.Mater.Sci. (RAMS)
No 1/2, Vol. 47, 2016, pages 95-104

THERMAL EVOLUTION OF THE MICROSTRUCTURE OF CALCIA STABILIZED ZIRCONIA
PRECURSORS MANUFACTURED BY CRYOCHEMICAL TECHNIQUE

O.Yu. Kurapova, D.V. Nechaeva, A.V. Ivanov, S.N. Golubev, V.M. Ushakov and V.G. Konakov

Abstract

The work reports the evolution of nanosized xCaO-(100-x)ZrO2 precursors, where x = 9-15 mol.% manufactured by the original cryochemical technique including co-precipitation and freeze-drying or gels freezing in liquid nitrogen. Basing on the results of SEM, BET, and PSD analysis, it was shown that the way of dehydration and the amount of CaO affect the pore size and precursor morphology. The systematic investigation performed by BET, TG, and XRD allowed to reveal the features of microstructural evolution of the precursors up on their annealing in the temperature range 400-1300 úC and to indentify the processes governing the transformation of amorphous sponge-type structure to globular crystalline one. It was found that specific surface area of the precursors after freeze-drying and freezing in the liquid nitrogen is ~1.5 times lower than in the case of the conventional evaporation techniques.

full paper (pdf, 1104 Kb)