Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 23, Issue 4, Pages 440-445Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2013.06.013
Keywords
Rare earth; Doping; Zirconia; Phase stability; Thermal conductivity; Thermal barrier coatings
Funding
- National Natural Science Foundation of China (NSFC) [50771013]
- National Basic Research Program (973 Program) of China [2012CB625100]
- New Century Excellent Talents in University (NCET)
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Rare earth oxides doping has been extensively investigated as one of the effective methods to lower thermal conductivity of 4.55 mol% Y2O3 stabilized ZrO2 (YSZ) thermal barrier coatings (TBCs). In the present work, 5-6 mol% Yb2O3 and Y2O3 co-doped ZrO2 ceramics were synthesized by solid reaction sintering at 1600 degrees C. phase stability of the samples after heat treatment at 1500 degrees C was investigated. Yb2O3 and Y2O3 co-doped zirconia, especially when Yb2O3/Y2O3 >= 1, contained less monoclinic phase than single Yb2O3 or Y2O3 phase doped zirconia, indicating that co-doped zirconia was more stable at high temperature than YSZ. The thermal conductivity of the 3 mol% Yb2O3+3 mol% Y2O3 co-doped ZrO2 was 1.8 W m(-1) K-1 at 1000 degrees C, which was more than 20% lower than that of YSZ. (C) 2013 Chinese Materials Research Society. Production and hosting by Elsesier B.V. All rights reserved
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