Structure and Thermophysical Properties of (Gd1-xYbx)2Zr2O7 (x=0, 0.1) Ceramics

被引：0

作者：

Zhang Y. ^{[1
]}

Xie M. ^{[1
]}

Mu R. ^{[1
,2
]}

Song X. ^{[1
]}

Wang Z. ^{[1
]}

Bao J. ^{[1
]}

机构：

[1] School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou

[2] Beijing Institute of Aeronautial Materials, Beijing

来源：

Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2022年 / 40卷 / 02期

关键词：

Ceramic materials for thermal barrier coatings; Gd[!sub]2[!/sub]Zr[!sub]2[!/sub]O[!sub]7[!/sub; Phase structure; Thermophysical properties;

D O I：

10.11785/S1000-4343.20220207

中图分类号：

学科分类号：

摘要：

The (Gd1-xYbx)2Zr2O7 (x=0, 0.1) ceramics were synthesized by a high energy ball milling solid reaction method. The phase structures, microstructures, bulk densities, thermal expansion coefficients and thermal diffusivities were identified by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Archimedes principle, high-temperature dilatometer and laser-flash apparatus (LFA), respectively. The results indicated that Gd2Zr2O7 ceramic sintered at 1600 ℃ for 6 h was composed of the pure pyrochlore structure, while (Gd0.9Yb0.1)2Zr2O7 ceramic was consisted of defective fluorite phase. In addition, the partial substitution of Yb3+ for Gd3+ resulted in a decreased lattice parameter. The grain boundaries of the (Gd1-xYbx)2Zr2O7 (x=0, 0.1) ceramics were clean, the size of grains was about 2 μm, the sintered ceramics were dense and the porosity was less than 1.5%. The average thermal expansion coefficients of (Gd1-xYbx)2Zr2O7 (x=0, 0.1) ceramics were similar, which was 11.05×10-6 and 10.83×10-6 K-1, respectively. Yb3+ doping substantially reduced the thermal diffusivity and thermal conductivity of Gd2Zr2O7 ceramic between room temperature and 600 ℃, while the thermal diffusivity and thermal conductivity of Gd2Zr2O7 and (Gd0.9Yb0.1)2Zr2O7 ceramics were similar above 600 ℃. © 2022, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.

引用

页码：244 / 249

页数：5

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