Investigation in low-temperature ageing of porous ZrO2 (Y) - Al2O3 ceramics

Phase transformations have been studied in samples of composite ceramics of the ZrO ₂ (Y) - Al ₂ O ₃ system, which differ in the porosity value and the content of the stabilizing yttrium impurity, in depending on their storage time at room temperature. It is shown that a decrease in the molar content of yttrium oxide in the zirconium phase of a porous composite leads to a sharp acceleration of the processes of its low-temperature aging. Phase transitions in the aged composite in the temperature range of 30 - 600 ° C were investigated by dilatometry.