Optimization and thermal cycling behavior of La2Ce2O7 thermal barrier coatings
Source abstract
Abstract
Abstract The La2Ce2O7 (LC) coating with the La/Ce ratio close to 1 was obtained by atmospheric plasma spraying, using La2Ce2.5O8 as a feedstock powder and optimized spray parameters. The spray distance plays a significant role in terms of phase composition, phase stability, as well as porosity of the LC coating, while keeping other spray parameters constant. The plasma-sprayed coatings were prepared and thermally cycled by gas-burner tests to evaluate thermal cycling lifetime. The thermal cycling lifetime of the LC/YSZ double-layer coating was more than three times the lifetime of a single-layer LC coating and comparable to the YSZ coating at operating temperature of ∼1230 °C. The thermal cycling lifetimes of the LC/YSZ coating were ∼40% longer at operating temperature of ∼1320 °C, but much lower at operating temperature of ∼1350 °C compared to the optimized YSZ coating. The failure mechanisms for the LC and LC/YSZ coatings thermally cycled under different conditions were also established in this work.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Advanced ceramic materials synthesis
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