Journal
CORROSION SCIENCE
Volume 170, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108659
Keywords
Thermal barrier coatings (TBC); Volcanic ash; Spreading; Infiltration; Subsurface lateral flow
Funding
- Nature Science Foundations of China (NSFC) [51590894, 51425102]
- 111 Project [B17002]
- National Science and Technology Major Project [2017-VI-00100081]
- Freigeist Fellowship of the VolkswagenStiftung on Volcanic Ash Deposition in Jet Engines (VADJEs) [89705]
- China Scholarship Council (CSC)
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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 degrees 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 degrees C. These findings are critical for understanding the corrosion mechanism of TBC in contaminated environments.
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