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Zirconia‐Related Phases in the Zirconia/Titanium Diffusion Couple After Annealing at 1100°–1550°C
Author(s) -
Lin KunLin,
Lin ChienCheng
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00526.x
Subject(s) - materials science , cubic zirconia , zirconium , scanning electron microscope , microstructure , transmission electron microscopy , annealing (glass) , crystallography , isothermal process , ceramic , analytical chemistry (journal) , metallurgy , composite material , chemistry , nanotechnology , physics , chromatography , thermodynamics
A diffusion couple of 3 mol% Y 2 O 3 –ZrO 2 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 ‐ZrO 2− 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 ‐ZrO 2− 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 ZrO 2− x , while twinned t ′‐ZrO 2− x or lenticular t ‐ZrO 2− x , which was embedded in ordered c‐ ZrO 2− x , was found. The ordered c ‐ZrO 2− x was identified by the{113} superlattice reflections of its electron diffraction patterns.