Abstract
Abstract Lanthanum zirconate, La 2 Zr 2 O 7 , is one of the most promising candidates for next-generation thermal bar-rier coating (TBC) applications in high efficient gas turbines due to its low thermal conductivity and chemical stabilityat high temperature. In this study, bulk specimens and thermal barrier coatings are fabricated via a variety of sinteringprocesses as well as suspension plasma spray in lanthanum zirconates with reduced rare-earth contents. The phase for-mation, microstructure, and thermo-physical properties of these oxide ceramics and coatings are examined. In particular,lanthanum zirconates with reduced rare-earth contents in a La 2 Zr 2 O 7 -4YSZ composite system exhibit a single phase offluorite or pyrochlore after fabricated by suspension plasma spray or spark plasma sintering. The potential of lanthanumzirconate ceramics for TBC applications is also discussed.Keywords: Thermal barrier coatings(TBCs), Suspension plasma spray, Lanthanum zirconate, Phase formation, Thermo-physical properties
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