Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings
The degradation process of thermal barrier coatings (TBCs) such as monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, composite 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ, and double-ceramic layer (DCL) La<s...
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| Online Access: | https://www.mdpi.com/1996-1944/13/14/3242 |
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| author | Anna Jasik Grzegorz Moskal Marta Mikuśkiewicz Agnieszka Tomaszewska Sebastian Jucha Damian Migas Hanna Myalska |
| author_facet | Anna Jasik Grzegorz Moskal Marta Mikuśkiewicz Agnieszka Tomaszewska Sebastian Jucha Damian Migas Hanna Myalska |
| author_sort | Anna Jasik |
| collection | DOAJ |
| description | The degradation process of thermal barrier coatings (TBCs) such as monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, composite 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ, and double-ceramic layer (DCL) La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ/8YSZ was investigated. Coatings were deposited using the atmospheric plasma spraying (APS) process (ceramic layer and bond-coat) on the Ni-based superalloy substrate with Ni-22Cr-10Al-1Y bond-coat. The thickness of the ceramic top-coats in all cases were 300 µm. In the case of La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/8YSZ, the internal sublayer was built from 8YSZ powder whereas the outer from La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>. Between both sublayers’ “composite” a 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ zone was present. The “composite” 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ TBC system was sprayed from two different feedstock powders with equal weight ratios. In the first part of the investigation, the microstructural characterization of the TBCs was presented. The main goals were related to the characterization of the degradation processes in different TBC systems with special emphasis on the phenomenon in the thermally grown oxide (TGO) zone related to oxidation, and the phenomenon related to phase stability in ceramic top-coats as related to temperature influence. The oxidation test was carried out in air at 1100 °C for 500 h. In the second step of the investigation, the numerical simulation of the monolayered TBC 8YSZ and La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> systems was analyzed from the stress distribution point of view. Additionally, the two-layered TBC coating of the DCL type was also analyzed. |
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| issn | 1996-1944 |
| language | English |
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| publishDate | 2020-07-01 |
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| spelling | doaj.art-bf1b59cde435405691c9c286ba761bab2023-11-20T07:26:53ZengMDPI AGMaterials1996-19442020-07-011314324210.3390/ma13143242Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier CoatingsAnna Jasik0Grzegorz Moskal1Marta Mikuśkiewicz2Agnieszka Tomaszewska3Sebastian Jucha4Damian Migas5Hanna Myalska6Department of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandDepartment of Advanced Materials and Technologies, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, PolandThe degradation process of thermal barrier coatings (TBCs) such as monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, composite 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ, and double-ceramic layer (DCL) La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ/8YSZ was investigated. Coatings were deposited using the atmospheric plasma spraying (APS) process (ceramic layer and bond-coat) on the Ni-based superalloy substrate with Ni-22Cr-10Al-1Y bond-coat. The thickness of the ceramic top-coats in all cases were 300 µm. In the case of La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/8YSZ, the internal sublayer was built from 8YSZ powder whereas the outer from La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>. Between both sublayers’ “composite” a 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ zone was present. The “composite” 50% La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 50% 8YSZ TBC system was sprayed from two different feedstock powders with equal weight ratios. In the first part of the investigation, the microstructural characterization of the TBCs was presented. The main goals were related to the characterization of the degradation processes in different TBC systems with special emphasis on the phenomenon in the thermally grown oxide (TGO) zone related to oxidation, and the phenomenon related to phase stability in ceramic top-coats as related to temperature influence. The oxidation test was carried out in air at 1100 °C for 500 h. In the second step of the investigation, the numerical simulation of the monolayered TBC 8YSZ and La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> systems was analyzed from the stress distribution point of view. Additionally, the two-layered TBC coating of the DCL type was also analyzed.https://www.mdpi.com/1996-1944/13/14/3242TBCLa zirconates8YSZdegradationTGO zonemutual inner multiphase TBC |
| spellingShingle | Anna Jasik Grzegorz Moskal Marta Mikuśkiewicz Agnieszka Tomaszewska Sebastian Jucha Damian Migas Hanna Myalska Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings Materials TBC La zirconates 8YSZ degradation TGO zone mutual inner multiphase TBC |
| title | Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings |
| title_full | Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings |
| title_fullStr | Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings |
| title_full_unstemmed | Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings |
| title_short | Oxidation Behavior of the Monolayered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, Composite La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ, and Double-Ceramic Layered La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> + 8YSZ/8YSZ Thermal Barrier Coatings |
| title_sort | oxidation behavior of the monolayered la sub 2 sub zr sub 2 sub o sub 7 sub composite la sub 2 sub zr sub 2 sub o sub 7 sub 8ysz and double ceramic layered la sub 2 sub zr sub 2 sub o sub 7 sub la sub 2 sub zr sub 2 sub o sub 7 sub 8ysz 8ysz thermal barrier coatings |
| topic | TBC La zirconates 8YSZ degradation TGO zone mutual inner multiphase TBC |
| url | https://www.mdpi.com/1996-1944/13/14/3242 |
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