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Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed $(Y_{0.8}Gd_{0.2})_{3}Al_{5}O_{12}$ Coatings
| Content Provider | MDPI |
|---|---|
| Author | Wang, Shixing He, Jian Xue, Zhaolu |
| Copyright Year | 2022 |
| Description | Garnet-type rare earth aluminate compounds are one class of promising potential candidate materials for thermal barrier coatings (TBCs). In this paper, $(Y_{0.8}Gd_{0.2})_{3}Al_{5}O_{12}$ (GYAG) coatings are fabricated by air plasma spraying, with the microstructure, high-temperature phase stability, and thermal conductivity investigated. The results showed that the as-deposited GYAG coating was relatively dense, and contained garnet-type $(Y_{0.8}Gd_{0.2})_{3}Al_{5}O_{12}$ phase and a small amount of $(Y,Gd)AlO_{3}$ and amorphous phases. The crystallized GYAG coating exhibited good phase stability from room temperature to 1450 °C. The coating had the lowest thermal conductivity of 1.17 $W·m^{−1}·K^{−1}$ at 800 °C, approximately 15% lower than that of the yttria-stabilized zirconia (YSZ) coating. After heat treatment at 1100 °C, the coating became denser with some fine grain precipitation, and formed a number of transverse and longitudinal cracks. |
| Starting Page | 510 |
| e-ISSN | 20796412 |
| DOI | 10.3390/coatings12040510 |
| Journal | Coatings |
| Issue Number | 4 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-04-09 |
| Access Restriction | Open |
| Subject Keyword | Coatings Coatings and Films Thermal Barrier Coatings (tbcs) Air Plasma Spraying (aps) (y0.8gd0.2)3al5o12 Phase Stability Thermal Conductivity |
| Content Type | Text |
| Resource Type | Article |
