Effect of ceria content on the sintering of ZrO2 based ceramics synthesized from a polymeric precursor

Zirconia-ceria powders with ceria concentration varying from 0 to 12 mol% were synthesised using a polymeric precursor route based on the Pechini process. Powder characteristics were evaluated with regard to the crystallite size, BET surface area, phase distribution, nitrogen adsorption/desorption behaviour, and agglomeration state. Sintering was studied considering the shrinkage rate, densification, grain size, and phase evolution. It was demonstrated that the synthesis method is effective for preparing nanosized powders of tetragonal zirconia single-phase. Sinterability mainly depended on the agglomeration state of the powders and the monoclinic phase content. Fully tetragonal zirconia ceramic, with grain size of 2.4 micron, was obtained after addition of at least 9 mol% ceria and sintering at 1500 C for 4 h. 32 refs.