This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.1016/j.scriptamat.2022.115169 in citations.
Please use the identifier: http://hdl.handle.net/2128/33661 in citations.
Metastable to stable phase transformation in atmospheric plasma sprayed Yb-silicate coating during post-heat treatment
Metastable to stable phase transformation in atmospheric plasma sprayed Yb-silicate coating during post-heat treatment
Yb-silicate is used as volatilization barrier material in environmental barrier coating applications. In this study, metastable to stable phase transformation in highly amorphous atmospheric plasma sprayed Yb-silicate coating was investigated during post-heat treatment. High-temperature X-ray diffra...
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Personal Name(s): | Bakan, Emine (Corresponding author) |
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Sohn, Yoo Jung / Vaßen, Robert | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Scripta materialia, 225 (2023) S. 115169 - |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2023
|
DOI: |
10.1016/j.scriptamat.2022.115169 |
Document Type: |
Journal Article |
Research Program: |
Gas turbines |
Link: |
Get full text Published on 2022-11-16. Available in OpenAccess from 2024-11-16. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/33661 in citations.
Yb-silicate is used as volatilization barrier material in environmental barrier coating applications. In this study, metastable to stable phase transformation in highly amorphous atmospheric plasma sprayed Yb-silicate coating was investigated during post-heat treatment. High-temperature X-ray diffraction (HT-XRD) was used to analyze the phase composition of the coating at elevated temperatures. Three metastable phases (Yb2Si2O7 (P-1), Yb2SiO5 (P21/c), Yb4.67Si3O13 (P63/m)) and two stable phases (Yb2Si2O7 (C2/m), Yb2SiO5 (I2/a)) preferentially crystallized from the amorphous coating starting at 1000 °C. Metastable phases transformed into stable Yb2Si2O7 and Yb2SiO5 at higher temperatures. HT-XRD data were used to estimate the volume expansion in the coating due to the phase transformation and the results were compared to the dilatometry measurements. The estimated expansion from HT-XRD data was larger than the measured expansion in dilatometry. Microstructural investigation revealed crack healing in the coating during the measurements which was associated with the lower expansion measured in dilatometry |