Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 18, Issue 4, Pages 665-671Publisher
SPRINGER
DOI: 10.1007/s11666-009-9350-1
Keywords
La2Ce2O7 (LCO); segmentation cracks; thermal barrier coatings (TBCs); thermal shock; thermo-physical properties
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Funding
- national natural science Foundation of China [50771009, 50731001]
- Changjiang scholars and innovative research team in university (PCSIRT) [IRT0512]
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La2Ce2O7 (LCO)/yttria-stabilized zirconia (YSZ) thermal barrier coating (TBC) with segmentation crack structure was produced by atmospheric plasma spraying. Thermo-physical properties, such as thermal diffusivities and thermal conductivities, and thermal cycling performance of the segmented LCO/YSZ TBC were investigated. The thermal conductivity of the segmented coating was measured to be around 1.02 W/mK at 1200 A degrees C, relatively lower than that of the non-segmented coating, respectively. The segmented LCO/YSZ TBC exhibited a thermal cycling lifetime of around 2100 cycles, improving the durability by nearly 50% as compared to the non-segmented TBC. The failure of the segmented coating occurred by chipping spallation and delamination cracking within the coating.
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