Change in the phase composition and properties of zirconia refractories under the prolonged effect of high temperatures

Abstract

A systematic study has been made of the behavior of ZrO2 stabilized with various oxides under the prolonged action of temperatures up to 2300°C. The optimal concentrations of Y2O3, Nd2O3, CaO, and MgO in the zirconia refractories have been established; this ensures the successful service life of the articles under conditions of multiple prolonged action of high temperatures. The ultimately permissible temperature at which is it possible to operate the zirconia articles has been determined: with the stabilization of ZrO2 by MgO it is 1900°C; with CaO, 2000°C; and with oxides of rare-earth elements, more than 2300°C.