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Application of biofuel impurities and effect on the hot corrosion of yttria-stabilized zirconia thermal barrier coatings

The contaminants found in biofuels include alkali and alkaline metals along with sulfur, phosphorus and silicon oxides. Furthermore, while calcium‑magnesium‑aluminum silicates (CMAS) are typically ingested as particulate in middle-east theaters, the impurity list in biofuels includes the necessary e...

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Bibliographic Details
Published in:Surface & coatings technology 2019-01, Vol.358, p.340-346
Main Authors: Ramirez Velasco, Jorge H., Kilaz, Gozdem, Kenttämaa, Hilkka I., Trice, Rodney W.
Format: Article
Language:English
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Summary:The contaminants found in biofuels include alkali and alkaline metals along with sulfur, phosphorus and silicon oxides. Furthermore, while calcium‑magnesium‑aluminum silicates (CMAS) are typically ingested as particulate in middle-east theaters, the impurity list in biofuels includes the necessary elements to form CMAS without exposure to any environment. This is significant as CMAS is particularly destructive for operating temperatures above its melting temperature (~1250 °C), particularly affecting the lifetime of 7 wt%Y2O3-ZrO2 (YSZ) thermal barrier coatings (TBCs). In the work reported currently, solutions containing the individual and unreacted constituents of CMAS were prepared and sprayed onto either air plasma sprayed (APS) or electron beam physically deposited (EB-PVD) TBCs and subsequently subjected to dynamic heating up to 1400 °C, simulating the deposit and thermal conditions of the biofuel impurities during combustion. Microstructure analysis revealed that the individual constituents of CMAS accelerated degradation of the TBCs compared to the same samples heated without impurities. •Biofuels impurities are different than those in conventional Jet A fuel; containing the individual and unreacted constituents found in CMAS.•We have developed a method to formulate and apply impurity cocktails (solutions containing the impurities of interest) to the surface of thermal barrier coatings.•The effect of impurity cocktails comprised of CMAS constituents on TBCs was evaluated using ablation testing, noting topcoat decreased lifetimes.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.10.019