Journal
CORROSION SCIENCE
Volume 182, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109230
Keywords
Thermal barrier coatings (TBCs); Calcium-magnesium-alumina-silicate (CMAS); Rare earth doped; First-principles calculation
Funding
- National Natural Science Foundation of China [51775189]
- Science and Technology Commission of Shanghai Municipality Project [16DZ2260604]
- Shanghai Space Science and Technology Innovation Fund [SAST 2019056]
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This study systematically investigated the corrosion behavior of Yb2O3-Y2O3 co-stabilized ZrO2 (YbYSZ) under CMAS melt attack, and found that YbYSZ exhibited better CMAS resistance than YSZ due to its excellent phase stability. The degradation of grain caused by CMAS attack was found to be greatly related to the diffusion rate of element, with Yb3+ demonstrating a low diffusion rate contributing to good phase stability. Additionally, YbYSZ showed a higher thermal expansion coefficient and lower thermal conductivity compared with YSZ.
In this study, corrosion behavior of Yb2O3-Y2O3 co-stabilized ZrO2 (YbYSZ) was systematically investigated under CMAS melt attack. The result was found that YbYSZ exhibited a better CMAS resistance than yttria stabilized zirconia (YSZ), which was attributed to the excellent phase stability. The degradation of grain caused by CMAS attack was greatly related to the diffusion rate of element substantially. Yb3+ exhibited a low diffusion rate contributing to good phase stability during corrosion. A corresponding first-principles calculation further confirmed this conclusion. Besides, YbYSZ showed a higher thermal expansion coefficient and lower thermal conductivity as compared with YSZ counterpart.
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