Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD
Thermal barrier coatings based on the yttria-zirconia system with compositions over 50 mol. % YO1.5 rest ZrO2 have shown potential as CMAS/Volcanic ash (VA) resistant coatings1–4. However, it is still not clear what Y-Zr ratio is the optimal to promote effective CMAS/VA arrest. A previous study has...
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ftdlr:oai:elib.dlr.de:123673 2024-05-19T07:39:58+00:00 Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD Gomez, J. Gomez Naraparaju, Ravisankar Mechnich, Peter Schulz, Uwe Chintalapalle, Ramana 2018 https://elib.dlr.de/123673/ unknown Gomez, J. Gomez und Naraparaju, Ravisankar und Mechnich, Peter und Schulz, Uwe und Chintalapalle, Ramana (2018) Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD. Thermal Barrier Coatings 5, 2018-06-25 - 2018-06-29, Irsee, Germany. Hochtemperatur-und Funktionsschutzschichten Struktur- und Funktionskeramik Konferenzbeitrag PeerReviewed 2018 ftdlr 2024-04-25T00:46:58Z Thermal barrier coatings based on the yttria-zirconia system with compositions over 50 mol. % YO1.5 rest ZrO2 have shown potential as CMAS/Volcanic ash (VA) resistant coatings1–4. However, it is still not clear what Y-Zr ratio is the optimal to promote effective CMAS/VA arrest. A previous study has shown that pure Y2O3 coatings are not as effective as their yttria-zirconia counterpart4 making this topic of high relevance for the development of CMAS/VA resistant coatings. Therefore, this study is based on the determination of the optimal Y-Zr ratio for EB-PVD TBCs produced with compositions ranging from 40-70 mol. % YO1.5. Preliminary results for short term infiltration (up to 7 min.) at 1250°C with natural VA from the Eyjafjallajökull volcano show a tendency of increased infiltration resistance with coatings having a higher yttria composition (70 mol. %) seen from Figure 15. The experiments indicate formation of reaction products when a 50 mol. % YO1.5 coating composition is used and no significant reaction with lower yttria compositions. Thus, it appears that the threshold point to saturate the glass promoting formation of reaction products (apatite and garnet) is for compositions with at least 50 mol % YO1.5. A systematic study will be presented to determine the optimum yttia content in EB-PVD coatings for effective glass crystallization. Conference Object Eyjafjallajökull German Aerospace Center: elib - DLR electronic library |
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German Aerospace Center: elib - DLR electronic library |
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topic |
Hochtemperatur-und Funktionsschutzschichten Struktur- und Funktionskeramik |
spellingShingle |
Hochtemperatur-und Funktionsschutzschichten Struktur- und Funktionskeramik Gomez, J. Gomez Naraparaju, Ravisankar Mechnich, Peter Schulz, Uwe Chintalapalle, Ramana Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
topic_facet |
Hochtemperatur-und Funktionsschutzschichten Struktur- und Funktionskeramik |
description |
Thermal barrier coatings based on the yttria-zirconia system with compositions over 50 mol. % YO1.5 rest ZrO2 have shown potential as CMAS/Volcanic ash (VA) resistant coatings1–4. However, it is still not clear what Y-Zr ratio is the optimal to promote effective CMAS/VA arrest. A previous study has shown that pure Y2O3 coatings are not as effective as their yttria-zirconia counterpart4 making this topic of high relevance for the development of CMAS/VA resistant coatings. Therefore, this study is based on the determination of the optimal Y-Zr ratio for EB-PVD TBCs produced with compositions ranging from 40-70 mol. % YO1.5. Preliminary results for short term infiltration (up to 7 min.) at 1250°C with natural VA from the Eyjafjallajökull volcano show a tendency of increased infiltration resistance with coatings having a higher yttria composition (70 mol. %) seen from Figure 15. The experiments indicate formation of reaction products when a 50 mol. % YO1.5 coating composition is used and no significant reaction with lower yttria compositions. Thus, it appears that the threshold point to saturate the glass promoting formation of reaction products (apatite and garnet) is for compositions with at least 50 mol % YO1.5. A systematic study will be presented to determine the optimum yttia content in EB-PVD coatings for effective glass crystallization. |
format |
Conference Object |
author |
Gomez, J. Gomez Naraparaju, Ravisankar Mechnich, Peter Schulz, Uwe Chintalapalle, Ramana |
author_facet |
Gomez, J. Gomez Naraparaju, Ravisankar Mechnich, Peter Schulz, Uwe Chintalapalle, Ramana |
author_sort |
Gomez, J. Gomez |
title |
Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
title_short |
Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
title_full |
Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
title_fullStr |
Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
title_full_unstemmed |
Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD |
title_sort |
y2o3-zro2 ratio studies for cmas resistant thermal barrier coatings prepared by eb-pvd |
publishDate |
2018 |
url |
https://elib.dlr.de/123673/ |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_relation |
Gomez, J. Gomez und Naraparaju, Ravisankar und Mechnich, Peter und Schulz, Uwe und Chintalapalle, Ramana (2018) Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD. Thermal Barrier Coatings 5, 2018-06-25 - 2018-06-29, Irsee, Germany. |
_version_ |
1799479544791433216 |