Ceria and yttria co-doped zirconia powders of end members and intermediate compositions along the tie lines joining 12 mol.-%CeO2 doped ZrO2 to 2 mol.-%Y2O3 doped ZrO2 and 12 mol-%CeO2 doped ZrO2 to 3 mol-%Y2O3 doped ZrO2 have been prepared as soft particle agglomerates by crystallising in supercritical methanol at 250°C for 5 h and supercritical drying. Compacts of powders were sintered in air to near theoretical density at very low temperature (∼ 1200°C). Sintered compacts containing <25 mol.-%(2Y2O3-98ZrO2) and (3Y2O3-97ZrO2) had excellent mechanical properties and also good thermal stability in humid conditions, showing little or no detectable tetragonal to monoclinic phase transformation on annealing in water at 200°C for 50 h. Above 25 mol.-% concentration 2Y2O3-98ZrO2 compositions showed increasing transformation to the monoclinic phase while 3Y2O3-97ZrO2 compositions showed little transformation over the full composition range.
|Number of pages||5|
|Journal||British Ceramic Transactions|
|Publication status||Published - 1996 Dec 1|
ASJC Scopus subject areas
- Ceramics and Composites