Home > Publications database > Crack healing mechanisms in atmospheric plasma sprayed Yb-silicate coatings during post-process heat treatment > print

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024 7 _ |a 10.1016/j.jeurceramsoc.2023.02.005
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024 7 _ |a 1873-619X
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037 _ _ |a FZJ-2023-01375
082 _ _ |a 660
100 1 _ |a Bakan, Emine
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245 _ _ |a Crack healing mechanisms in atmospheric plasma sprayed Yb-silicate coatings during post-process heat treatment
260 _ _ |a Amsterdam [u.a.]
|c 2023
|b Elsevier Science
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520 _ _ |a The microstructural evolution of partially amorphous, atmospheric plasma-sprayed Yb-silicate coatings was investigated after heat treatment (HT, 1300 °C). Open porosity as well as crack area and widths in the coatings were characterized. A correlation was found between the increasing amorphous content of the as-sprayed coatings and the reduction in crack area due to crack healing after HT. Characterization results also suggested larger crack widths in the coatings after HT. The first crack-healing mechanism proposed was the capillarity-driven viscous flow of the amorphous phase in the coatings. It was experimentally shown that viscous flow-driven crack spheroidization (crack width enlargement), and crack healing started in the coatings at 1050 °C. Secondly, metastable to stable phase transformation (> 1100 °C) induced expansion in the constrained coatings was discussed as a crack healing mechanism. Finally, a two-step heat treatment was designed to prevent crack width enlargement during HT resulting in reduced porosity.
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700 1 _ |a Vaßen, Robert
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773 _ _ |a 10.1016/j.jeurceramsoc.2023.02.005
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|t Journal of the European Ceramic Society
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856 4 _ |u https://juser.fz-juelich.de/record/1005227/files/1-s2.0-S0955221923000936-main-1.pdf
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856 4 _ |y Published on 2023-02-04. Available in OpenAccess from 2024-02-04.
|u https://juser.fz-juelich.de/record/1005227/files/post-referee%20draft_2023_JECERS_Bakan.pdf
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