Synthesis of Al[2]O[3]-ZrO[2] powders from differently concentrated suspensions with a spray drying technique

Abstract

The composite powders of aluminium and zirconium oxides containing 10, 50 and 90 mol % Al{3+} without a stabilizer have been obtained from suspensions using a spray drying method. The powders obtained at equal mole ratios of zirconium and aluminum in the original solution (0.5:0.5 mol/l) have the largest contents of cubic and tetragonal phases of ZrO[2], strictly uniform distribution of phases and the largest value of the specific surface area. The particles with two different morphologies have been obtained: crystalline particles of oxides uniformly distributed in a particle and particles in membrane consisting of zirconium oxide or mixed oxides. It has been experimentally shown that zirconium oxide stabilizes the amorphous phase of aluminum oxide, and aluminum oxide increases the temperature of crystallization of zirconium oxide.