Abstract
The impact of Ti4+ substitutions in Dy2Zr2O7 and the resultant structural, mechanical, morphological behaviour and hot corrosion characteristics were evaluated for potential applications in thermal barrier coatings. The results ensured the ability of Dy2Zr2O7 to hold 20 mol. % of Ti4+ to retain fluorite structure of Dy2Zr2O7 while the attempt to substitute an excess Ti4+ led to the partial phase transitions from fluorite to pyrochlore. Quantitative analysis revealed the significant contraction of Dy2Zr2O7 unit cell due to the replacement of relatively larger Zi4+ by the lower sized Ti4+. Morphological analysis ensured well-defined microstructures with definite grain size and boundaries and this inference displayed a direct impact on the resultant mechanical properties of the system. The results from the hot corrosion studies also indicated a better resistance displayed by the Dy2Zr2O7 fluorite due to Ti4+ substitutions.
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