Processing of alumina-zirconiacomposites by slip casting

H. L. CALAMBÁS; L. B. GARRIDO ; M. P. ALBANO

Valparaiso

Congreso; SAM/CONAMET 2012; 2012

Asociación argentina de Materiales

Two commercial 3 mol% yttria-partially stabilized zirconia powders, 0.3 wt% Al2O3-doped (Aldoped Y-PSZ) and without Al2O3 (Y-PSZ), were used to produce concentrated aqueous Al2O3-ZrO2 suspensions for slip casting. The different textural characteristics and interfacial charge properties of the two zirconia powders were believed to strongly affect the dispersion properties of Al2O3-ZrO2 suspensions. In this study, the effect of the substitution of Al2O3 and/or Y-PSZ by Aldoped Y-PSZ on the rheological properties of concentrated aqueous Al2O3-ZrO2 slips was studied. In addition, the density of green cast samples was studied and related to the degree of slip dispersion. The viscosity and yield stress values of Al2O3- Al-doped Y-PSZ suspensions were higher than those of Al2O3-Y-PSZ ones for all the compositions and solid loading studied. The substitution of Y-PSZ by Al-doped Y-PSZ in the Al2O3 ? ZrO2 mixtures resulted in a less dense packing of cast samples.