期刊
CORROSION SCIENCE
卷 191, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109740
关键词
A Ceramic; A Stainless Steel; B SEM; B XRD; C Reactor conditions; C Molten sodium
资金
- DAE fellowship
This study investigates the impact of Laser Surface Remelting on plasma-sprayed TBCs to mitigate molten sodium corrosion. The remelted layer initially retains structural integrity but eventually leads to corrosive damage due to vertical cracks infiltrating molten sodium into non-remelted layers.
Liquid-metal corrosion in molten sodium is a significant issue to Thermal Barrier Coatings (TBCs) proposed for in-core fast breeder reactor applications. In this study, the viability of attenuating molten sodium corrosion of plasma-sprayed yttria-stabilized zirconia TBCs is investigated by microstructure re-engineering using Laser Surface Remelting (LSR). LSR produced a smooth and dense surface with columnar microstructure and segmented vertical cracks. At the onset of molten sodium corrosion, the remelted layer retained structural integrity but exhibited localized corrosive attack along the surface-network cracks. However, on further exposure, the vertical cracks lead to molten sodium infiltration down the non-remelted layers, causing corrosive damage and spallation of coating.
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