Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal: Effect of Y3+ distribution in grain interiors
Source abstract
Abstract
Herein, the microstructure in 3 mol% Y 2O 3-stabilized tetragonal ZrO 2 polycrystals (Y-TZP) at the early stage of the low-temperature degradation (LTD) was analyzed using scanning transmission electron microscopy (STEM)-nanoprobe and energy-dispersive spectroscopy (EDS) techniques. The effects of the grain size and Y 3+ concentration within the grain interiors on the LTD behavior were experimentally investigated using Y-TZP bodies prepared through the isothermal sintering process. The tetragonal-to-monoclinic ( T → M) phase transformation, which is the LTD origin, was accelerated by the Y 3+ concentration decrease within the grain interiors, and was insensitive to the grain size. The STEM-nanoprobe EDS analysis revealed that the T → M phase transformation preferentially occurred from the tetragonal phase with low Y 3+ concentration.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Advancements in Solid Oxide Fuel Cells
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