کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1459456 | 989593 | 2016 | 8 صفحه PDF | دانلود رایگان |
A series of ThO2-doped Y2O3 stabilized ZrO2 monolith compounds were prepared and investigated. The bigger ionic radius of Th4+ substitutions dilutes the average oxygen coordination to the cations, which is the determinant factor of the phase stability. Therefore, ThO2 incorporation has a strong impact on the phase composition, and consequently on the thermo-mechanical properties of the specimens. The metastable t′ phase was stabilized in light-doped specimens with a decreasing tetragonality while the thermodynamic equilibrium t phase and the related martensitic t–m phase transformation were absent in ThO2-doped specimens. Additionally, lower thermal conductivity was also achieved due to the substitutional phonon scattering effect. Considering the phase stability and thermo-mechanical properties, ThO2-doped Y2O3 stabilized ZrO2 compounds may be promising candidates for thermal barrier coatings although further research may be needed to improve their mechanical properties.
Journal: Ceramics International - Volume 42, Issue 1, Part A, January 2016, Pages 501–508