Y3Ce7Ta2O23.5 and Yb3Ce7Ta2O23.5—Two kinds of novel ceramics for thermal barrier coatings |
| |
| Authors: | Wang Shi-min Zhu Wei-wei Zhang Hong-song Wang Fei Sun Debing Yang Xian-feng Su Zhi-he Duan Qun-peng Mai Wen-peng |
| |
| Affiliation: | 1. Department of Materials and Chemistry Engineering, Henan University of Engineering, Zhengzhou, 451191, PR China;2. Department of Computer Engineering, Henan University of Engineering, Zhengzhou, 451191, PR China;3. Department of Mechanical Engineering, Henan University of Engineering, Zhengzhou, 451191, PR China;4. College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, 410014, China |
| |
| Abstract: | For the development of ceramic candidates for thermal barrier coatings, two kinds of new ceramics, Y3Ce7Ta2O23.5 and Yb3Ce7Ta2O23.5, were synthesized by sintering at 1873?K for 10?h. The obtained samples were composed of a single fluorite-type phase, and their relative densities are greater than 90%. Because of phonon scattering caused by the complex lattice, the large number of oxygen vacancies, and substituted atoms, the thermal conductivity is lower than that of 8YSZ. The coefficients of thermal expansion (CTEs) of these two products are located in the range of 10.22–12.57?×?10?6/K and 9.62–12.66?×?10?6/K, respectively, from 323?K to 1473?K, and they also exhibit excellent phase stability up to 1473?K. However, their thermal conductivities and CTEs are lower than those of RE2Ce2O7 (RE?=?La, Nd, or Sm). |
| |
| Keywords: | Thermal barrier coatings Rare-earth tantalite Thermal conductivity Coefficient of thermal expansion |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
