Abstract
In this study, first, Gd2Zr2O7/ceria–yttria stabilized zirconia (GZ/CYSZ) TBCs having multilayered and functionally graded designs were subjected to thermal shock (TS) test. The GZ/CYSZ functionally graded coatings displayed better thermal shock resistance than multilayered and single layered Gd2Zr2O7 coatings. Second, single layered YSZ and functionally graded eight layered GZ/CYSZ coating (FG8) having superior TS life time were selected for CMAS + hot corrosion test. CMAS + hot corrosion tests were carried out in the same experiment at once. Furthermore, to generate a thermal gradient, specimens were cooled from the back surface of the substrate while heating from the top surface of the TBC by a CO2 laser beam. Microstructural characterizations showed that the reaction products were penetrated locally inside of the YSZ. On the other hand, a reaction layer having ∼6 μm thickness between CMAS and Gd2Zr2O7 was seen. This reaction layer inhibited to further penetration of the reaction products inside of the FG8.
| Original language | English |
|---|---|
| Pages (from-to) | 2501-2508 |
| Number of pages | 8 |
| Journal | Journal of the European Ceramic Society |
| Volume | 37 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1 Jun 2017 |
Bibliographical note
Publisher Copyright:© 2017 Elsevier Ltd
Funding
This work was supported by Scientific Research Project Funds of Istanbul Technical University (Project Number: 38102) and the Academic Staff Training Program (OYP) of the Council of Higher Education of Turkey. The authors thank Prof. Dr. Yilmaz Taptik, Assist. Prof. Dr. Nuri Solak and Hasan Huseyin Sezer for their contributions on thermal spray and characterisation processes.
| Funders | Funder number |
|---|---|
| Council of Higher Education of Turkey | |
| Istanbul Teknik Üniversitesi | 38102 |
Keywords
- CMAS
- GdZrO
- Hot corrosion
- Thermal barrier coating
- Thermal shock