Furnace Cyclic Oxidation Behavior of Multicomponent Low Conductivity Thermal Barrier Coatings

Zhu, Dongming; Nesbitt, James A.; Barrett, C. A.; McCue, Terry R.; Miller, Rita J.

doi:10.1361/10599630418185

Cited by 9 publications

(8 citation statements)

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“…In previous work, the grain size of LaYbZr 2 O 7 ceramic was compared with pure Yb 2 Zr 2 O 7 or La 2 Zr 2 O 7 and a 5–10 times reduction was observed after 20 h heat treatment at 1600°C indicating a grain growth rate in the biphase structure. Meanwhile, many researchers have provided tremendous evidences for grain growth of APS YSZ during TBC application . In the as‐sprayed YSZ, the grains are nanosized columns in the splats .…”

Section: Resultsmentioning

confidence: 99%

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity

et al. 2015

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LaYbZr 2 O 7 ceramic thermal barrier coatings (TBC) of metastable structure were prepared by an air plasma spraying process. Their microstructure and associated thermal transport properties evolution during high-temperature annealing at 1300°C were characterized. The as-sprayed LaYbZr 2 O 7 TBCs underwent a fast crystallization and a quasi-eutectoid transformation during annealing, resulting in a biphase composite consisting of La-rich pyrochlore phase and Yb 2 Zr 2 O 7 fluorite phase with coherent phase boundaries. Due to the diffusion barriers between the two phases as well as the low interface energy of the coherent boundaries, sintering and grain growth of materials was significantly refrained. Therefore, a final thermal dynamically stable microstructure with a grain size of 300 nm and a total porosity about 5% could be maintained even after long-term aging at a high temperature of 1300°C. Resulting from this stable microstructure, an ultralow thermal conductivity of 1.3 WÁ(mÁK) -1 could be obtained even after 216 h high-temperature aging, which is much lower than that of the state-of-art 7 wt% yttria-stabilized zirconia TBCs. Both the high phase and microstructure stability and the extremely low thermal conductivities could be particularly beneficial for TBC material in gas turbine applications.

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Section: Resultsmentioning

confidence: 99%

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity

et al. 2015

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“…The early failure and short cyclic lifetime of the first batch (batch 1) coating systems including the baseline ZrO 2 -8wt%Y 2 O 3 , was attributed to the dense top coat (ref. 19), and also the NiCoCrAlY bond coat (ref. 20).…”

Section: Resultsmentioning

confidence: 99%

Furnace cyclic oxidation behavior of multicomponent low conductivity thermal barrier coatings

et al. 2004

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“…The fact that the zirconia is stabilized in its t 0 state is the key to its long-term structural stability and resistance to transformation to the monoclinic state. For reasons that are not yet entirely clear, coatings made of the 8YSZ composition also have the longest thermal life cycle [20]. Another key attribute of the 8YSZ composition is that it is in thermochemical equilibrium with the aluminum oxide TGO formed on oxidation of typical bond-coats.…”

Section: Phase Stability and Thermo-chemical Compatibilitymentioning

confidence: 99%

Enhanced zirconia thermal barrier coating systems

Clarke

Levi

Evans

2006

Proceedings of the Institution of Mechanical Engineers, Part A:

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The results of a research programme sponsored by the Department of Energy and directed at establishing some of the scientific issues underpinning the development of enhanced zirconia thermal barrier coatings (TBCs) are reviewed. Our studies have established the stability ranges for both yttria stabilized and codoped zirconia coating materials and identified the mechanisms responsible for failure of current coating systems. These reveal that it is likely that present EB-PVD coatings systems are limited by the performance of current bondcoats and their oxidation behaviour, especially under thermal cycle conditions, rather than the zirconia coating material itself. These studies provide the scientific framework for the development of enhanced zirconia-based thermal barrier coating systems for advanced industrial gas turbine engine applications.

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Furnace Cyclic Oxidation Behavior of Multicomponent Low Conductivity Thermal Barrier Coatings

Cited by 9 publications

References 1 publication

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity

Furnace cyclic oxidation behavior of multicomponent low conductivity thermal barrier coatings

Enhanced zirconia thermal barrier coating systems

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Furnace Cyclic Oxidation Behavior of Multicomponent Low Conductivity Thermal Barrier Coatings

Cited by 9 publications

References 1 publication

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr2O7–Part II: Microstructure & Thermal Conductivity

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr2O7–Part II: Microstructure & Thermal Conductivity

Furnace cyclic oxidation behavior of multicomponent low conductivity thermal barrier coatings

Enhanced zirconia thermal barrier coating systems

Contact Info

Product

Resources

About

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity

High‐Temperature Aging of Plasma Sprayed Quasi‐Eutectoid LaYbZr₂O₇–Part II: Microstructure & Thermal Conductivity