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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fteci:oai:dc.engconfintl.org:tbcv-1079 2023-05-15T16:09:37+02:00 Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB- PVD Gomez Chavez, Juan J. Chintalapalle, Ramana Mechnich, Peter Naraparaju, Ravisankar Schulz, Uwe 2018-06-24T07:00:00Z https://dc.engconfintl.org/tbcv/13 unknown ECI Digital Archives https://dc.engconfintl.org/tbcv/13 Thermal Barrier Coatings V CMAS/VA reaction products infiltration resistance threshold point Engineering text 2018 fteci 2022-12-27T14:50:32Z 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. Please click Additional Files below to see the full abstract. Text Eyjafjallajökull Engineering Conferences International: ECI Digital Archives |
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Engineering Conferences International: ECI Digital Archives |
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CMAS/VA reaction products infiltration resistance threshold point Engineering |
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CMAS/VA reaction products infiltration resistance threshold point Engineering Gomez Chavez, Juan J. Chintalapalle, Ramana Mechnich, Peter Naraparaju, Ravisankar Schulz, Uwe Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB- PVD |
topic_facet |
CMAS/VA reaction products infiltration resistance threshold point Engineering |
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. Please click Additional Files below to see the full abstract. |
format |
Text |
author |
Gomez Chavez, Juan J. Chintalapalle, Ramana Mechnich, Peter Naraparaju, Ravisankar Schulz, Uwe |
author_facet |
Gomez Chavez, Juan J. Chintalapalle, Ramana Mechnich, Peter Naraparaju, Ravisankar Schulz, Uwe |
author_sort |
Gomez Chavez, Juan J. |
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 |
publisher |
ECI Digital Archives |
publishDate |
2018 |
url |
https://dc.engconfintl.org/tbcv/13 |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
Thermal Barrier Coatings V |
op_relation |
https://dc.engconfintl.org/tbcv/13 |
_version_ |
1766405473898070016 |