Dynamic spreading of re-melted volcanic ash bead on thermal barrier coatings

Yang, Shanjie; Song, Wenjia; Lavallee, Yan; Zhou, Xin; Dingwell, Donald B. and Guo, Hongbo (2020): Dynamic spreading of re-melted volcanic ash bead on thermal barrier coatings. In: Corrosion Science, Vol. 170, 108659

Abstract

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.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences
• Subjects: 500 Science > 550 Earth sciences and geology
• ISSN: 0010-938X
• Language: English