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Synthesis and properties of nanocrystalline 90 wt % ZrO2(Y2O3, CeO2)-10 wt % Al2O3 powder

O.Dudnik,
 
† A.Shevchenko,
 
O.Ruban,
 
V.Redko,
 
† L.Lopato
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Inorganic Materials, 2008, Т.44, #4
http://www.materials.kiev.ua/article/284

Abstract

Using hydrothermal treatment of coprecipitated hydroxides, we have prepared nanocrystalline ZrO2-rich ZrO2-Y2O3-CeO2-Al2O3 powder. The effect of heat treatment on the properties of the powder has been studied in the temperature range 400–1300°C. The powder has been shown to have a metastable phase composition, which is attributable to structural and size factors and also to the fact that the ZrO2 and Al2O3 crystallites inhibit the growth of each other. Sintering the powder under various conditions, we have obtained ceramics with fracture toughnesses from 6.4 to 16.8 MPa•m1/2.


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