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Y3Ce7Ta2O23.5 and Yb3Ce7Ta2O23.5—Two kinds of novel ceramics for thermal barrier coatings
Ceramics International ( IF 5.2 ) Pub Date : 2019-06-01 , DOI: 10.1016/j.ceramint.2019.02.100
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

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).

中文翻译:

Y3Ce7Ta2O23.5和Yb3Ce7Ta2O23.5——两种新型热障涂层陶瓷

摘要 为了开发用于热障涂层的陶瓷候选物,通过在 1873 K 下烧结 10 小时合成了两种新型陶瓷 Y3Ce7Ta2O23.5 和 Yb3Ce7Ta2O23.5。所得样品由单一的萤石型相组成,其相对密度大于90%。由于复杂晶格、大量氧空位和取代原子引起的声子散射,热导率低于8YSZ。这两种产品的热膨胀系数 (CTE) 分别位于 10.22-12.57 × 10-6/K 和 9.62-12.66 × 10-6/K 范围内,从 323 K 到 1473 K,并且它们也表现出高达 1473 K 的出色相稳定性。然而,它们的热导率和 CTE 低于 RE2Ce2O7(RE = La、Nd 或 Sm)。
更新日期:2019-06-01
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