| Autor: |
Wang, Jun, Li, Jianyu, Jiang, Chunyu, Song, Jianbo, Yang, Xing, Ma, Xiaolong, Luo, Kailiang, Wu, Peng, Chong, Xiaoyu, Feng, Jing |
| Zdroj: |
Journal of Rare Earths; 20240101, Issue: Preprints |
| Abstrakt: |
Thermal barrier coatings (TBCs) materials with lowered thermal and oxygen ion conductivity can provide thermal and oxidative protection for high temperature hot-end components in aeronautical engines and gas turbines. The rare-earth tantalate RETaO4(RE = Dy, Gd and Sm) ceramics with monoclinic (m) phase were successfully synthesized via spark plasma sintering. Oxygen vacancies responsible for the thermal and oxygen ion conductivities of RETaO4were demonstrated by atomic-resolution energy dispersive X-ray and X-ray photoelectron spectroscopy. Among the three samples, DyTaO4has excellent oxygen/thermal barrier performance. Compared to the current service thermal barrier coating material ZrO2-8 wt% Y2O3(8 YSZ), DyTaO4has an ultra-low oxygen ion conductivity benefiting from low oxygen vacancy concentration and strong stretching force constants. The intrinsic thermal conductivity of DyTaO4is 68.2% less than that of 8 YSZ. Additionally, the thermal expansion rate curves indicate that the phase transformation does not happen from room temperature to 1200 °C. The above results demonstrate that high-growth rate thermally grown oxide can be retarded by creating dense DyTaO4coating with lowered thermal and oxygen ion conductivity. |
| Databáze: |
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