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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium High-Temperature Systems for Energy Conversion and Storage
Presentation Title Thermomechanical Properties of Bilayer La2Zr2O7 Thermal Barrier Coatings
Author(s) Xingye Guo, Zhe Lu, Yeon-Gil Jung, Li Li, James Knapp,
On-Site Speaker (Planned)
Abstract Scope La2Zr2O7 is one of the proposed next generation thermal barrier coating materials with low thermal conductivity and superior high temperature stability. In this work, La2Zr2O7 and conventional 8 wt% yttria stabilized zirconia (8YSZ) coatings were deposited using plasma spray technique. Both single-layer and double-layer coating architectures were designed in the matrix for evaluation. Coatings' thermal and mechanical properties were characterized. Thermal cycling and thermal shock tests were implemented using furnace heat treatment and jet engine thermal shock (JETS) tests. Although a lower thermal conductivity is confirmed in this test, La2Zr2O7 coatings present a lower erosion resistance compared to conventional 8YSZs. The double-layer structures with a porous La2Zr2O7 coating on top of a porous 8YSZ coating have a better thermal shock and thermal cycling performance than those of both single-layer La2Zr2O7 coatings and double-layer structures but with a dense 8YSZ sublayer. The findings allow us to propose efficient coating systems.
Proceedings Inclusion? Planned: A print-only volume

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