Characteristic of mullite-zirconium ceramic obtained from powders synthesized by the hydrothermal method

Abstract

The effect of the hydrothermal method of synthesis of the initial powders using chemical reagents and illite clay as the initial components on the phase composition and structure as well as some properties of mullite-zirconium ceramic was studied. It is shown that mullite and the tetragonal modification of ZrO2 predominate in the sintered ceramic material but closed pores are also present. As the firing temperature increases and especially with the addition of illite clay the degree of sintering and therefore the compression strength increase. The elastic modulus increases with temperature difference increasing to 1000/20°C, just as with the addition of illite clay, to 35 and 95 GPa, respectively, while with 500/20 it increases to 20 and 22 GPa.