期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 6, 页码 2210-2214出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.02.002
关键词
Ceramics; Rare earth tantalate; Alumina; Thermal conductivity; Thermal expansion coefficients
资金
- Natural Science Foundation of China [51762028]
- young talent support programs of Kunming University of Science and Technology [11504146]
In this paper, a series of solid solutions ceramics of (AlxGd1-x)(3)Tao(7) (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 (Al(x)G(1-x))(3)TaO7 ceramics is weberite in spite of the content of Al3+ is up to 5 mol.%. The thermal conductivities of (AlxGd1-x)(3)TaO7 ceramics range from 1.37 W.m(-1) K-1 to 1.47 W.m(-1) K-1 at 900 degrees C, 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)(3)TaO7 ceramics vary in the range of 6-10 x 10(-6) K-1 within the temperature range 100-1200 degrees C, 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)(3)TaO7 ceramics, they have the potential to be the next generational thermal barrier coating materials.
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