Structure and thermal properties of Al2O3-doped Gd3TaO7 as potential thermal barrier coating |
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| Authors: | Fushuo Wu Peng Wu Lin Chen Jing Feng |
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| Affiliation: | Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People’s Republic of China |
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| Abstract: | In this paper, a series of solid solutions ceramics of (AlxGd1-x)3TaO7 (x = 0, 0.01, 0.03, 0.05) were synthesized via solid-state reaction. X-ray diffraction (XRD) and Raman spectroscopy analysis indicated that the crystal structure of (AlxGd1-x)3TaO7 ceramics is weberite in spite of the content of Al3+ is up to 5 mol.%. The thermal conductivities of (AlxGd1-x)3TaO7 ceramics range from 1.37 W?m?1 K?1 to 1.47 W?m?1 K?1 at 900 ℃, which is much lower than that of 7–8 YSZ (about 2.5 W?m?1 K?1). The thermal expansion coefficients (TECs) of (AlxGd1-x)3TaO7 ceramics vary in the range of 6–10 × 10-6 K-1 within the temperature range 100–1200 ℃, and the values are close to the TECs of 7–8 YSZ. Given the low thermal conductivity and high thermal expansion coefficients of (AlxGd1-x)3TaO7 ceramics, they have the potential to be the next generational thermal barrier coating materials. |
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| Keywords: | Corresponding author. Ceramics Rare earth tantalate Alumina Thermal conductivity Thermal expansion coefficients |
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