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Preparation and thermal conductivities of Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 ceramics for thermal barrier coatings |
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| Authors: | Hongsong Zhang Suran LiaoXudan Dang Shaokang GuanZheng Zhang |
| Affiliation: | a Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007, China b Department of Materials and Chemistry, Henan Institute of Engineering, Zhengzhou 450007, China c School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China |
| Abstract: | Two kinds of rare earth cerium oxides Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 were prepared by solid state reaction method at 1600 °C for 10 h. The phase compositions, microstructures, and their thermal conductivities of these materials were investigated. XRD results revealed that single phase Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 with fluorite structure were synthesized. Results of SEM and EDS showed that the microstructures of these materials were dense and no other phases existed among grains. Because of phonon scattering resulted by the oxygen vacancies and difference in atomic mass between substitutional atoms and host atoms, thermal conductivities of Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 are lower than that of 8YSZ at 800 °C, and thermal conductivity of (Gd0.9Ca0.1)2Ce2O6.9 is lower than that of Gd2Ce2O7. These results imply the Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 can be used as novel candidate materials for thermal barrier coatings in the future. |
| Keywords: | Cerium oxides Thermal conductivity Phonon scattering Thermal barrier coatings |
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