Thermodynamic characterization of RE2Ti2O7 (RE = Ho, Er, Tm and Yb) ceramics as thermal barrier coating materials

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics Pub Date : 2025-07-16 DOI:10.1016/j.mtphys.2025.101801

Zhixin Gao , Shuai Fu , Lei Zhang , Detian Wan , Yiwang Bao

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Abstract

Several RE₂Ti₂O₇ (RE = Ho, Er, Tm, and Yb) ceramics with pyrochlore structure were prepared by a high-temperature solid-phase method, and their thermophysical properties were investigated as thermal barrier coating (TBC) facing materials. The results showed that the prepared samples maintained low thermal conductivity (1.31 W m⁻¹ K⁻¹, 1200 °C), high hardness (10.1 GPa) and high fracture toughness (2.72 MPa m^1/2). The RE₂Ti₂O₇ ceramics have good stability without phase transformation at 1350 °C for 50 h. In addition, thermal expansion coefficient of ceramics matches well with the Ni-based alloy and has good chemical compatibility with Al₂O₃. All these results indicate that the RE₂Ti₂O₇ ceramics have excellent mechanical properties and good component homogeneity, suggesting their potential application in the field of TBCs.

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RE2Ti2O7 （RE = Ho, Er， Tm和Yb）陶瓷作为热障涂层材料的热力学表征

采用高温固相法制备了几种具有焦绿石结构的RE2Ti2O7 （RE = Ho, Er, Tm, Yb）陶瓷，并对其作为热障涂层（TBC）表面材料的热物理性能进行了研究。结果表明，制备的样品具有低导热系数（1.31 W·m−1·K−1,1200℃）、高硬度（10.1 GPa）和高断裂韧性（2.72 MPa·m1/2）。RE2Ti2O7陶瓷具有良好的稳定性，在1350℃下保温50小时不发生相变。陶瓷的热膨胀系数与ni基合金匹配良好，与Al2O3具有良好的化学相容性。这些结果表明，RE2Ti2O7陶瓷具有优异的力学性能和良好的组分均匀性，在tbc领域具有潜在的应用前景。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.