| DOI | Resolve DOI: https://doi.org/10.1115/1.4031240 |
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| Author | Search for: Li, Xiaolong; Search for: Huang, Xiao; Search for: Yang, Qi1; Search for: Tang, Zhaolin |
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| Affiliation | - National Research Council Canada. Aerospace
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| Format | Text, Article |
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| Subject | Coatings; 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 |
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| Abstract | Oxidation 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. |
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| Publication date | 2015-08-25 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21277486 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | a1c015a7-5edc-4e15-895f-5966a1eb13c8 |
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| Record created | 2016-03-09 |
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| Record modified | 2020-04-22 |
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