The ultra-low glasslike thermal conductivities of Y3+- and Ce4+- codoped lanthanum zirconate pyrochlores for potential thermal barrier coating applications

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-10-30 DOI:10.1016/j.jeurceramsoc.2024.117038

Yanfei Wang , Weiran Zhang , Jinping Du, Duan Li, Rongjun Liu

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Abstract

It is urgent to develop thermal barrier coating (TBC) topcoat materials with ultra-low thermal conductivities for next-generation gas turbine engines. A novel pyrochlore-based single-phased ceramic, tuned by codoping of lanthanum zirconate, (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇, has been synthesized from the solid state reaction method. The thermal conductivity of (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇ not only exhibits a temperature-independent trend but also reaches as low as 0.93 W·m⁻¹·K⁻¹, a value that is lowest of fully dense crystalline solids in open literature, attributing to the following two combined effects. The first is the strong scattering of phonons by small-sized Y³⁺ cations occupying the oversized atomic cages formed by the distinctive pyrochlore structure. The second is the lattice softening effects arising from larger-sized Ce⁴⁺ substituting Zr⁴⁺ cations. The above two effects act in concert and thus form a glasslike and ultra-low thermal conductivity of (La_1-xY_x)₂(Zr_1-yCe_y)₂O₇ solid solutions, which is ideal for next-generation TBC topcoat applications.

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Y3+- 和 Ce4+- 共掺锆酸镧热胶体的超低玻璃样热导率，可用于潜在的热障涂层应用

为下一代燃气涡轮发动机开发导热系数超低的热障涂层（TBC）面层材料迫在眉睫。通过固态反应方法合成了一种新型的基于吡咯啉的单相陶瓷--锆酸镧共掺物 (La1-xYx)2(Zr1-yCey)2O7。(La1-xYx)2(Zr1-yCey)2O7的热导率不仅呈现出与温度无关的趋势，而且低至0.93 W-m-1-K-1，是公开文献中全致密结晶固体的最低值，这归因于以下两种综合效应。首先，小尺寸的 Y3+ 阳离子占据了由独特的火绿宝石结构形成的超大原子笼，对声子产生了强烈的散射。其次是较大尺寸的 Ce4+ 取代 Zr4+ 阳离子所产生的晶格软化效应。上述两种效应协同作用，形成了玻璃状和超低导热率的 (La1-xYx)2(Zr1-yCey)2O7固溶体，是下一代 TBC 表层涂料应用的理想选择。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.