Abstract
Abstract The effects of doping with praseodymium and of preparation method on the Ca-FSZ (fully stabilised zirconia) system were studied. Samples were prepared by a ceramic method (CE) and several sol-gel methods, namely colloidal (CG), citrate (CI) , and polymeric (PG). Two samples with the compositions (ZrO2)0·7(CaO)0·2(Pr2O3) 0·05 (doped) and (ZrO2)0·8(CaO)0·2 (undoped) were prepared by each method, in order to study the influence of praseodymium doping. DTA-T G analysis was carried out on all samples. Powders fired for 12 h at 500 and 900°C were sieved at 60 μm, uniaxially pressed at 20 MPa, and fired for 2 h at 1500 and 1600°C. The resulting compacts were characterised by XRD, SEM-EDX, Vickers microhardness testing, and density and lattice parameter measurements. The results indicate that the praseodymium enters the CaO-Z rO2(c) solid solution, improving densification and microhardness. Samples prepared by sol-gel methods showed better densification and higher microhardness than samples prepared by t...
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