High-temperature oxidation behaviours of rare earth-based pyrochlore structured A 2 B 2 O 7 /yttria-stabilized zirconia thermal barrier coatings

Abstract

Addressing the challenge of cost-effectively synthesizing stable thermal barrier coating materials has been a significant hurdle. This study describes the bulk synthesis of stannate-based pyrochlore compounds, specifically erbium tin oxide (Er₂Sn₂O₇) and yttrium tin oxide (Y₂Sn₂O₇). These synthesized pyrochlore oxides and commercially available yttria-stabilized zirconia (YSZ) were coated onto nickel super alloy. The coated specimens were subjected to thermal oxidation kinetics studies at 900 ± 5°C for 200 h, and alterations in physico-chemical characteristics, modifications in surface morphology, and variations in the composition of thermal barrier coating (TBCs) before and after exposure to oxidation conditions were evaluated. Oxidation kinetics results demonstrate that Er₂Sn₂O₇ pyrochlore oxide has better performance than other Y₂Sn₂O₇ and commercial YSZ TBC materials in high-temperature thermal barrier systems.

Keywords

thermal barrier coatings pyrochlore compounds molten salt synthesis plasma spray process oxidation FESEM

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