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Research Article | Open Access

Low thermal conductivity and anisotropic thermal expansion of ferroelastic (Gd1−xYx)TaO4 ceramics

Chenkai QUa, Lin CHENa, Liang LVb, Yuncheng WANGb, Xiaolan JIb, Haitao YUNb, Chaoqun SUb, Jing FENGa()
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
AECC South Industry Co., Ltd., Zhuzhou 412000, China
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Abstract

In this paper, (Gd1−xYx)TaO4 ceramics have been fabricated by solid-phase synthesis reaction. Each sample was found to crystallize in a monoclinic phase by X-ray diffraction (XRD). The properties of (Gd1−xYx)TaO4 were optimized by adjusting the ratio of Gd/Y. (Gd1−xYx)TaO4 had a low high-temperature thermal conductivity (1.37–2.05 W∙m−1∙K−1), which was regulated by lattice imperfections. The phase transition temperature of the (Gd1−xYx)TaO4 ceramics was higher than 1500 ℃. Moreover, the linear thermal expansion coefficients (TECs) were 10.5×10−6 K−1 (1200 ℃), which was not inferior to yttria-stabilized zirconia (YSZ) (11×10−6 K−1, 1200 ℃). (Gd1−xYx)TaO4 had anisotropic thermal expansion. Therefore, controlling preferred orientation could minimize the TEC mismatch when (Gd1−xYx)TaO4 coatings were deposited on different substrates as thermal barrier coatings (TBCs). Based on their excellent properties, it is believed that the (Gd1−xYx)TaO4 ceramics will become the next generation of high-temperature thermal protective coatings.

Keywords

thermal barrier coatings (TBCs)thermal conductivityhigh-temperature phase stabilityhigh-temperature X-ray diffraction (XRD)anisotropic thermal expansion

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Journal of Advanced Ceramics
Volume 11 Issue 11,
November 2022
Pages 1696-1713
DOI: 10.1007/s40145-022-0641-z
Cite this article:
QU C, CHEN L, LV L, et al. Low thermal conductivity and anisotropic thermal expansion of ferroelastic (Gd1−xYx)TaO4 ceramics. Journal of Advanced Ceramics, 2022, 11(11): 1696-1713. https://doi.org/10.1007/s40145-022-0641-z
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