A novel (Ho0.2Er0.2Tm0.2Yb0.2Lu0.2)2Zr2O7 high-entropy ceramic with excellent CMAS corrosion resistance for thermal barrier coatings

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-07-01 Epub Date: 2025-03-31 DOI:10.1016/j.corsci.2025.112904

Lingxu Yang , Fangkun Xie , Haojun Geng , Liankui Wu , Huijun Liu , Chaoliu Zeng

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Abstract

A novel high-entropy rare-earth zirconate (HE-REZ) ceramic composed of five rare-earth elements with smaller radius was firstly designed and successfully synthesized in this work. The microstructure, phase composition, thermal properties and CMAS corrosion behavior of the (Ho_0.2Er_0.2Tm_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ were also characterized. Results show that the as-prepared HE-REZ displays single-phase defective fluorite-type structure with excellent lattice stability, lower thermal conductivity (1.57 W·m⁻¹·K⁻¹ at 1000 °C), and higher CTE (10.96 ×10⁻⁶·K⁻¹ at 1000 °C). Moreover, it possesses excellent CMAS corrosion resistance with an average corrosion rate of 2.5 µm/h at 1300 ℃ within 20 h. Therefore, the novel (Ho_0.2Er_0.2Tm_0.2Yb_0.2Lu_0.2)₂Zr₂O₇ high-entropy ceramic would be a promising material for thermal barrier coatings.

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一种新型（Ho0.2Er0.2Tm0.2Yb0.2Lu0.2）2Zr2O7高熵陶瓷，具有优异的CMAS耐蚀性

本文首次设计并成功合成了一种由5种半径较小的稀土元素组成的新型高熵稀土锆酸盐（HE-REZ）陶瓷。研究了（Ho0.2Er0.2Tm0.2Yb0.2Lu0.2）2Zr2O7的显微组织、相组成、热性能和CMAS腐蚀行为。结果表明，制备的HE-REZ具有优异的晶格稳定性、较低的导热系数（1000 ℃时为1.57 W·m−1·K−1）和较高的CTE（1000 ℃时为10.96 ×10−6·K−1）。具有优异的抗CMAS腐蚀性能，在1300℃下，在20 h内的平均腐蚀速率为2.5 µm/h。因此，新型（Ho0.2Er0.2Tm0.2Yb0.2Lu0.2）2Zr2O7高熵陶瓷是一种很有前途的热障涂层材料。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.