Structural effects of liquid infiltration of 3Y-Zirconia with Sc, Mg and Y

Abstract

The current work has investigated the effect of co-doping 3Y-Zirconia (3YSZ) with Sc, Mg and Y by liquid infiltration. Pre-sintered porous discs of 3YSZ were immersed in diluted nitric acid solutions containing Sc, Mg or Y, and combinations of the three, trapping liquid within the porosities of the samples. Upon drying, the cations are maintained inside the pellet, making the basis for the co-doping. After sintering, mass increase confirms the co-doping effect. Rietveld refinements of X-ray diffraction data show that the liquid-infiltrated samples contain the tetragonal t, t'' and cubic c-phase in various fractions depending on the doping elements. The phases are compared with 3YSZ and 5YSZ sintered for 0 hours and 2 hours at 1500 °C. To evaluate the material properties in an application-based perspective, the Knoop hardness, translucency and grain size was measured. We conclude that liquid infiltration is a viable route to perform co-doping of Zirconia.

arXiv comment16 pages, 6 figures, supplementary section included after reference list