Dynamic spreading of re-melted volcanic ash bead on thermal barrier coatings
| Autor: | Yan Lavallée, Hongbo Guo, Xin Zhou, Wenjia Song, Donald B. Dingwell, Shanjie Yang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Diffusion 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Microstructure Corrosion Thermal barrier coating Infiltration (hydrology) Coating 0202 electrical engineering electronic engineering information engineering engineering Surface roughness General Materials Science Composite material 0210 nano-technology Volcanic ash |
| Zdroj: | CORROSION SCIENCE |
| Popis: | Dynamic spreading of 1 mm diameter volcanic ash bead on thermal barrier coatings (TBCs) surfaces and the infiltration and subsurface lateral flow of these melts within TBCs were quantitatively investigated at 1200−1600 °C for 1−10000 min. The spreading areas, infiltration depths and lateral flow distances are controlled by melt viscosity, coating surface roughness and microstructures. The lateral flow along the inter-column of the coating was dramatically accelerated at higher temperature with a diffusion distance of more than 5.3 mm within 1 min at 1600 °C. These findings are critical for understanding the corrosion mechanism of TBC in contaminated environments. |
| Databáze: | OpenAIRE |
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