Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance

R. W. Yang, Y. P. Liang, J. Xu, X. Y. Meng, J. T. Zhu, S. Y. Cao, M. Y. Wei, R. X. Zhang, J. L. Yang, F. Gao

科研成果: 期刊稿件文章同行评审

30 引用 (Scopus)

摘要

The introduction of porous structures into high-entropy ceramics is expected to further improve its thermal insulation performance. In this work, a series of novel rare-earth-niobate high-entropy ceramic foams ((Dy0.2Ho0.2Y0.2Er0.2Yb0.2)3NbO7) with hierarchical pore structures were prepared by a particle-stabilized foaming method. Atomic-scale analysis reveals that high entropy causes atom displacement and lattice distortion. The high-entropy ceramic foams exhibit high porosity (90.13%-96.13%) and ultralow thermal conductivity (0.0343–0.0592 W/(m·K)) at room temperature. High-entropy ceramic foam prepared by a 20 wt% slurry sintered at 1500 °C has the porosity of 96.12% and extremely low thermal conductivity of 0.0343 W/(m·K). The existence of walls and secondary pores contributes to reduced thermal conductivity. There is a temperature difference of over 800 °C between frontside and backside of the sample under fire resistance test. The research indicates that these as-prepared high-entropy ceramic foams are expected to be promising thermal insulation materials.

源语言英语
页(从-至)94-102
页数9
期刊Journal of Materials Science and Technology
116
DOI
出版状态已出版 - 20 7月 2022

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