Effect of ultrafine powders obtained by mechanical grinding on the density of ceramic material made of aluminum and zirconium oxides

Abstract

The results of grinding powdered, solid zirconium and aluminum oxides in various grinding units: ball, planetary and bead mills are presented. The grinding materials were: partially yttrium-stabilized zirconium dioxide of the PSZ-5,5Y brand (USA) and alumina with an alpha phase content of more than 99,0 wt. % of the brand Almatis CT 3000 GS (Germany). It is shown that in order to obtain high-purity, ultrafine oxide powders, it is advisable to use bead mills with zirconium dioxide grinding balls with dimensions of 0,6‒0,8 mm, with a ratio of M : W, as 1 : 4 and a specific grinding energy of 0,6‒0,8 kW. Achieving the ultrafine state of the initial oxide powders activates their solid-phase sintering, increases the density of ceramic materials: for aluminum oxide from 3,50‒3,78 g/cm³, for zirconium oxide from 5,40‒5,89 g/cm³.