Application of biofuel impurities and effect on the hot corrosion of yttria-stabilized zirconia thermal barrier coatings
| Autor: | Hilkka I. Kenttämaa, Gozdem Kilaz, Rodney W. Trice, Jorge H. Ramirez Velasco |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Silicon Metallurgy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal Microstructure Combustion 01 natural sciences Surfaces Coatings and Films Corrosion Thermal barrier coating chemistry Impurity 0103 physical sciences Materials Chemistry 0210 nano-technology Yttria-stabilized zirconia |
| Zdroj: | Surface and Coatings Technology. 358:340-346 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2018.10.019 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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