Isothermal and cyclic oxidation performance of vertically cracked and columnar thermal barrier coating structures produced using axial suspension plasma spraying process

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DOIResolve DOI: http://doi.org/10.1115/1.4031240
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TypeArticle
Journal titleJournal of Engineering for Gas Turbines and Power
ISSN0742-4795
Volume138
Issue1
Article number12506
SubjectCoatings; Cracks; Creep resistance; Isotherms; Oxidation; Plasma jets; Plasma spraying; Strain energy; Substrates; Thermal conductivity; Thermal expansion; Thermal spraying; Yttria stabilized zirconia; Zirconia; Columnar structures; Isothermal oxidations; Nickel- based superalloys; Peak temperatures; Platinum-aluminide bond coat; Suspension plasma spraying; Thermal barrier coating (TBCs); Thermally grown oxide; Thermal barrier coatings
AbstractOxidation performance of thermal barrier coatings (TBCs) deposited by the axial suspension plasma spraying (ASPS) method was evaluated under isothermal and cyclic conditions with a peak temperature of 1080â ‰°C. The TBC systems are based on two nickel-based superalloy substrates (CMSX-4 and IN738LC), platinum aluminide bond coat (BC), and yttria-stabilized zirconia (8YSZ) top coat (TC) of either vertically cracked (VC) or columnar structure. Samples with IN738LC substrate exhibited longer isothermal oxidation lives whereas the ones with CMSX-4 substrate showed greater cyclic oxidation lives. Outward diffusion of W and Ta in TBC systems containing CMSX-4 was found to have progressed to the interface between thermally grown oxide (TGO) and TC; this has contributed to the reduced isothermal oxidation life. The longer cyclic oxidation lives of TBC systems with CMSX-4 were attributed to less coefficient and thermal expansion (CTE) mismatch between coating layers (reduced strain energy) and better creep resistance of diffusional BC on CMSX-4, hence less TGO rumpling. TBC systems with columnar YSZ had longer isothermal oxidation lives while those with VC YSZ seemed to result in longer cyclic lives.
Publication date
PublisherAmerican Society of Mechanical Engineers
LanguageEnglish
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21277486
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Record identifiera1c015a7-5edc-4e15-895f-5966a1eb13c8
Record created2016-03-09
Record modified2016-05-09
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