TY - JOUR
T1 - Microstructural, mechanical, and electrical characteristics of alumina-reinforced ytterbia-stabilized cubic zirconia-based composites
AU - Wada, Masashi
AU - Sekino, Tohru
AU - Kusunose, Takafumi
AU - Nakayama, Tadachika
AU - Niihara, Koichi
PY - 2004/5/1
Y1 - 2004/5/1
N2 - Al2O3-dispersed Yb2O3-stabilized cubic-ZrO2 (YbSZ) composites are fabricated by pressureless sintering of composite powders to obtain fine and homogeneous microstructures by the solution chemistry route. Al2O3 particles are deposited on ZrO2 powders by the precipitation of aluminum nitrate followed by calcination in air. The sinterability of the composites was affected by the calcination temperature. Microstructures of the sintered bodies are dependent on the Al2O3 content. For the 5 vol% Al2O3-dispersed composite, fine Al2O3 particles were mainly located inside the grains of zirconia, whereas relatively large Al2O3 particles almost dispersed at the grain boundaries when the Al2O3 content was increased. The grain growth of YbSZ was suppressed by the Al2O3 addition, and the refinement of the matrix grain improved the fracture strength of YbSZ. The YbSZ and YbSZ/Al2O3 composites exhibited almost similar ionic conductivity at high temperatures of around 1000 °C.
AB - Al2O3-dispersed Yb2O3-stabilized cubic-ZrO2 (YbSZ) composites are fabricated by pressureless sintering of composite powders to obtain fine and homogeneous microstructures by the solution chemistry route. Al2O3 particles are deposited on ZrO2 powders by the precipitation of aluminum nitrate followed by calcination in air. The sinterability of the composites was affected by the calcination temperature. Microstructures of the sintered bodies are dependent on the Al2O3 content. For the 5 vol% Al2O3-dispersed composite, fine Al2O3 particles were mainly located inside the grains of zirconia, whereas relatively large Al2O3 particles almost dispersed at the grain boundaries when the Al2O3 content was increased. The grain growth of YbSZ was suppressed by the Al2O3 addition, and the refinement of the matrix grain improved the fracture strength of YbSZ. The YbSZ and YbSZ/Al2O3 composites exhibited almost similar ionic conductivity at high temperatures of around 1000 °C.
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U2 - 10.1557/JMR.2004.0194
DO - 10.1557/JMR.2004.0194
M3 - Article
AN - SCOPUS:3142665968
VL - 19
SP - 1455
EP - 1460
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 5
ER -