材料科学
烧结
断裂韧性
热障涂层
陶瓷
锆酸盐
热膨胀
复合材料
焦绿石
粒度
放电等离子烧结
热稳定性
热导率
相(物质)
化学工程
化学
有机化学
工程类
钛酸酯
作者
Xiaomin Luo,Shuo Huang,Ruiqi Huang,Chunhui Xu,Shuen Hou,Hongyun Jin
标识
DOI:10.1016/j.ceramint.2023.04.173
摘要
Single-phase high-entropy rare-earth zirconate (Dy0.2Nd0.2Sm0.2Eu0.2Yb0.2)2Zr2O7 with excellent high-temperature phase stability at 1600 °C was designed and synthesized. After being heated at 1600 °C for 1 ∼ 50 h, the average grain size of the sample increases only from 0.74 μm to 2.22 μm, indicating a high anti-sintering ability. The fracture toughness is 2.07 ± 0.03 MPa m1/2 (25 °C), which is 50% higher than lanthanum zirconate. The local lattice distortions induced by the atomic interactions and atomic-size mismatch are considered to be responsible for the strong anti-sintering ability and improved fracture toughness. In addition, the thermal expansion coefficient and thermal conductivity of (Dy0.2Nd0.2Sm0.2Eu0.2Yb0.2)2Zr2O7 are 10.59 × 10-6 K-1 (25 ∼ 1500 °C) and 1.14 ± 0.09 W·m-1·K-1 (1500 °C), respectively. The outstanding combination of anti-sintering ability, mechanical behavior, and thermophysical properties of (Dy0.2Nd0.2Sm0.2Eu0.2Yb0.2)2Zr2O7 highlights its great potential for next-generation thermal barrier coating applications.
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