Abstract
Yttria stabilized zirconia sintered by silicate glass phase with addition of ytterbium or gadolinium was investigated. The grain growth rate was found to be higher in the gadolinium doped samples. The glass phase of the ytterbium doped sample showed partial crystallization on cooling. Grain conductivity was found to be highest in samples with a half hour of sintering, having decreased due to stabilizing ion migration from the grains to the grain boundary glassy phase. The differences observed in the sintering behavior and properties of the sintered bodies are attributed to the different ionic radii of the Yb+3 and Gd+3 ions.
Highlights
Pure zirconia has three polymorphic phases that are stable in different temperature ranges
Liquid phase sintering promotes the formation of a solid solution
Liquid phase sintering of cubic yttrium stabilized zirconia is very sensitive to minor additions of rare earth ions
Summary
Pure zirconia has three polymorphic phases that are stable in different temperature ranges. The rare earth ions participate in the grain stabilization and in the liquid phase, the relative concentration between these two phases being dependent on their ionic radius[5]. This work reports on the microstructural evolution of ZrO2, 7 mol% Y2O3, 1 mol% RE2O3, where RE = Yb or Gd, by liquid phase sintering.
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