Equimolar multi-component doped (Sc0.25Ho0.25Er0.25Yb0.25)4Hf3O12 ceramic fabricated via ultrafast high-temperature sintering (UHS) for thermal barrier coatings: Thermophysical properties, high-temperature stability, and mechanical properties

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-08 DOI:10.1016/j.jeurceramsoc.2025.117803

Fanwei Meng , Fuxing Ye , Yuan Yao , Ziqi Song

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Abstract

Rising service temperature of advanced aero-engines necessitates the development of new thermal barrier coatings (TBCs) ceramic. This study presents a novel equimolar multi-component doped (Sc_0.25Ho_0.25Er_0.25Yb_0.25)₄Hf₃O₁₂ ceramic synthesized by ultrafast high-temperature sintering (UHS), systematically compared with single-component Er₄Hf₃O₁₂ ceramic. Results reveal that 4SH exhibited a 14.1 % lower thermal conductivity (1.76 W·m⁻¹·K⁻¹) compared to EH (2.05 W·m⁻¹·K⁻¹) at 1500 ℃. Notably, 4SH had a coefficient of thermal expansion (14.5 ×10⁻⁶ 1/K, 1500 ℃) matched with the alloy substrate. Furthermore, 4SH possessed superior resistance to sintering, which retained 72.1 % pores after annealing at 1500 ℃ for 150 h, while EH retained 61.5 %. Finally, 4SH was determined as the ductile ceramic material. The excellent performances mainly attribute to controlled intergranular bonding, intense size disorder, and sluggish diffusion effect. Generally, the potential exists in 4SH to be further developed as a candidate for next-generation TBCs.

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超快高温烧结制备热障涂层用等摩尔多组分掺杂（Sc0.25Ho0.25Er0.25Yb0.25） 4hf3012陶瓷：热物理性能、高温稳定性和机械性能

随着先进航空发动机使用温度的不断升高，研制新型热障涂层（tbc）势在必行。采用超快高温烧结（UHS）法制备了一种新型等摩尔多组分掺杂（Sc0.25Ho0.25Er0.25Yb0.25）4Hf3O12陶瓷，并与单组分Er4Hf3O12陶瓷进行了系统比较。结果表明，在1500℃时，4SH的导热系数（1.76 W·m−1·K−1）比EH（2.05 W·m−1·K−1）低14.1 %。值得注意的是，4SH的热膨胀系数（14.5 ×10−6 1/K, 1500℃）与合金基体相匹配。此外，4SH具有优异的抗烧结性能，在1500℃退火150 h后，4SH的气孔保留率为72.1 %，EH的气孔保留率为61.5 %。最后确定4SH为韧性陶瓷材料。优异的性能主要归因于可控的晶间键合、强烈的尺寸无序和缓慢的扩散效应。一般来说，作为下一代tbc的候选者，4SH存在进一步开发的潜力。

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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.