Certain Properties of Higher Purity Zirconium Dioxide

摘要

An increase in purity of initial zirconium dioxide to a 99.5% content of basic oxide, improves the phys-mechan properties of the material at high temperatures, which considerably exceed analogous characteristics for objects on technical ZrO2 base. The optimum amount of stabilizing oxide for ZrO2 of higher purity is 10 mol. % of CaO or MgO, which under industrial calcining temperatures (1700-1750C) assures total sintering of the material, sufficient degree of its stabilization and highest phys-mechanical properties. Stabilization of ZrO2 with magnesium oxide assures better calcining (packing) of the material mainly at low sintering temperatures (to 1700C) and obtainment of calcined objects with much higher mechanical characteristics in comparison with ZrO2, stabilized with calcium oxide. TiO2 and A12O3 admixtures even though they do improve the sintering of ZrO2 of higher purity during its stabilization with calcium oxide, but simultaneously they reduce the heat resistant properties of the material, which is especially evident in case of an A12O3 admixture. (Author)