This title appears in the Scientific Report :
2023
Please use the identifier:
http://hdl.handle.net/2128/34276 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.jeurceramsoc.2023.02.005 in citations.
Crack healing mechanisms in atmospheric plasma sprayed Yb-silicate coatings during post-process heat treatment
Crack healing mechanisms in atmospheric plasma sprayed Yb-silicate coatings during post-process heat treatment
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 conte...
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Personal Name(s): | Bakan, Emine (Corresponding author) |
---|---|
Vaßen, Robert | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Journal of the European Ceramic Society, 43 (2023) 8, S. 3684-3693 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2023
|
DOI: |
10.1016/j.jeurceramsoc.2023.02.005 |
Document Type: |
Journal Article |
Research Program: |
Gas turbines |
Link: |
Get full text Published on 2023-02-04. Available in OpenAccess from 2024-02-04. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.jeurceramsoc.2023.02.005 in citations.
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. |