Dynamic spreading of re-melted volcanic ash bead on thermal barrier coatings
Dynamic spreading of re-melted volcanic ash bead on thermal barrier coatings
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DOI：
10.1016/j.corsci.2020.108659
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发表时间：
2020-07
影响因子：
8.3
通讯作者：
Shanjie Yang;Wenjia Song;Y. Lavallée;Xin Zhou;Donald Bruce Dingwell;Hongbo Guo
中科院分区：
文献类型：
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作者：
Shanjie Yang;Wenjia Song;Y. Lavallée;Xin Zhou;Donald Bruce Dingwell;Hongbo Guo
在1200 - 1600 °C、1 - 10000 min条件下，定量研究了直径为1 mm的火山灰珠在热障涂层（TBCs）表面上的动态铺展以及这些熔体在TBCs内的渗透和次表面横向流动。铺展面积、浸润深度和侧向流动距离由熔体粘度、涂层表面粗糙度和微观结构控制。在较高温度下，涂层柱间的横向流动沿着显著加速，在1600 °C下1 min内扩散距离超过5.3 mm。这些发现对于理解TBC在污染环境中的腐蚀机理至关重要。
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.