TY - JOUR
T1 - High-temperature creep resistance in rare-earth-doped, fine-grained Al2O3
AU - Yoshida, H.
AU - Ikuhara, Y.
AU - Sakuma, T.
N1 - Funding Information:
The authors wish to thank Mr. S. Miura for his experimental assistance. The authors also express their gratitude to the Ministry of Education, Science and Culture, Japan, for the financial support by a Grant-in-Aid for Developmental Scientific Research (2)-06555202 for Fundamental Scientific Research.
PY - 1998/9
Y1 - 1998/9
N2 - High-temperature creep in undoped Al2O3 and La2O3- or Y2O3- or Lu2O3-doped Al2O3 with a grain size of about 1 μm is examined in uniaxial compression testing at temperatures between 1150 and 1350°C. The high-temperature creep resistance in Al2O3 is highly improved by the rare-earth oxide doping in the level of 0.045 mol %, and the creep rate is suppressed in the order La2O3 < Y2O3 < Lu2O3. Rare-earth ions in each doped Al2O3 are found to segregate in Al2O3 grain boundaries without forming amorphous phase or second-phase particles. The activation energy for creep in undoped Al2O3 is estimated to be 410 kJ/mol, while it is about 800 kJ/mol in the three rare-earth oxide-doped Al2O3. The grain boundary diffusivity must be highly reduced by the segregation of the dopant cation in Al2O3 grain boundaries.
AB - High-temperature creep in undoped Al2O3 and La2O3- or Y2O3- or Lu2O3-doped Al2O3 with a grain size of about 1 μm is examined in uniaxial compression testing at temperatures between 1150 and 1350°C. The high-temperature creep resistance in Al2O3 is highly improved by the rare-earth oxide doping in the level of 0.045 mol %, and the creep rate is suppressed in the order La2O3 < Y2O3 < Lu2O3. Rare-earth ions in each doped Al2O3 are found to segregate in Al2O3 grain boundaries without forming amorphous phase or second-phase particles. The activation energy for creep in undoped Al2O3 is estimated to be 410 kJ/mol, while it is about 800 kJ/mol in the three rare-earth oxide-doped Al2O3. The grain boundary diffusivity must be highly reduced by the segregation of the dopant cation in Al2O3 grain boundaries.
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U2 - 10.1557/JMR.1998.0362
DO - 10.1557/JMR.1998.0362
M3 - Article
AN - SCOPUS:0032163264
VL - 13
SP - 2597
EP - 2601
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 9
ER -