TY - JOUR
T1 - Zirconia-related phases in the zirconia/titanium diffusion couple after annealing at 1100°-1550°C
AU - Lin, Kun Lin
AU - Lin, Chien-Cheng
PY - 2005/10
Y1 - 2005/10
N2 - 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 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 1/5 {113} superlattice reflections of its electron diffraction patterns.
AB - 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 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 1/5 {113} superlattice reflections of its electron diffraction patterns.
UR - http://www.scopus.com/inward/record.url?scp=27644553458&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2005.00526.x
DO - 10.1111/j.1551-2916.2005.00526.x
M3 - Article
AN - SCOPUS:27644553458
VL - 88
SP - 2928
EP - 2934
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 10
ER -