通过 B 位Ta置换对 AB O4型EuNbO4的热学和力学性质进行优化

2020年第6卷第2期

摘要

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《工程（英文）》 >> 2020年第6卷第2期 doi: 10.1016/j.eng.2019.12.006

通过 B 位Ta置换对 AB O₄型EuNbO₄的热学和力学性质进行优化

Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

收稿日期： 2019-04-23 修回日期： 2019-08-01 录用日期： 2019-08-01 发布日期： 2019-12-11

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摘要

铁弹性的ABO₄型RETaO₄陶瓷和RENbO₄陶瓷（RE表示稀土）是具有潜在应用价值的热障涂层（TBC）材料，研究人员正在对其进行大量研究。结果显示， RETaO₄陶瓷的力学性质优于RENbO₄陶瓷的力学性质。在本研究中，我们通过B位钽（Ta）置换对利用固相法（SSR）制备的EuNbO₄陶瓷的热学和力学性质进行优化。我们使用X射线衍射（XRD）法和拉曼光谱技术对所制备的晶体结构进行确认，并利用扫描电子显微镜（SEM）对结构表面的微观形貌进行观察。结果表明，通过B位Ta置换可以有效提高EuNbO₄陶瓷的杨氏模量和热膨胀系数（TEC），且其最大值分别为169 GPa和1.12×10⁻⁵ K⁻¹（1200 ℃）； EuNbO₄陶瓷的热导率被降低至1.52 W·K^–1·m^–1（700 ℃），且材料的抗热辐射能力得到了改善。我们建立了声子热扩散系数与温度之间的关系，用以通过消除热辐射效应来确定声子本征热导率。研究结果表明，通过B位Ta置换能够有效优化EuNbO₄的热学和力学性质，从而使得此种材料在将来可成为一种高温结构陶瓷材料。

关键词

热障涂层 ; 稀土铌酸盐 ; 置换 ; 热导率 ; 热膨胀系数 ; 杨氏模量

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参考文献

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