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Zirconia-Related Phases in the Zirconia/Titanium Diffusion Couple After Annealing at 1100°–1550°C

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A diffusion couple of 3 mol% Y2O3–ZrO2 and titanium was isothermally annealed in argon at temperatures between 1100° and 1550°C. The phases and microstructure in the ceramic side were investigated using scanning electron microscopy and transmission electron microscopy, both attached to an energy-dispersive spectrometer. After annealing at 1100°C/6 h, zirconia grains did not grow conspicuously and evolved only traces of oxygen, resulting in t-ZrO2−x but not α-Zr. At temperatures above 1300°C, a significant amount of oxygen evolved from zirconia, reducing the O/Zr ratio, such that α-Zr was excluded from t-ZrO2−x during cooling, yielding a higher O/Zr ratio (≈2). When held at 1550°C/6 h, zirconia grains grew rapidly. The α-Zr was segregated on grain boundaries during cooling by the exsolution of zirconium from ZrO2−x, while twinned t′-ZrO2−x or lenticular t-ZrO2−x, which was embedded in ordered c-ZrO2−x, was found. The ordered c-ZrO2−x was identified by the {113} superlattice reflections of its electron diffraction patterns.

Document Type: Research Article


Affiliations: Department of Materials Science and Engineering, National Chaio Tung University, Hsinchu 30050, Taiwan

Publication date: 2005-10-01

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