High-entropy engineering promotes the thermal properties and corrosion resistance of rare-earth hafnates

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2024-09-27 DOI:10.1111/jace.20157

Kexin Li, Yiling Huang, Xuemei Song, Fan Peng, Zeyu Chen, Wei Zheng, Jimei Zhang, Yi Zeng

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Abstract

Rare-earth hafnates are gaining attention due to their excellent high-temperature phase stability and low thermal conductivity. However, they still have shortcomings of low thermal expansion and poor calcium-magnesium-aluminum-silicate (CMAS) corrosion resistance. In this study, we employed high-entropy engineering and component design to synthesize three high-entropy hafnates (La_0.2Ce_0.2Nd_0.2Gd_0.2T_0.2)₂Hf₂O₇ (T = Dy, Ho, Tm) as well as a single-component hafnate Nd₂Hf₂O₇, with the aim of preparing thermal barrier coatings with an excellent comprehensive performance. Test results indicate that the high-entropy compositions have excellent thermal properties. The focus is on elucidating the corrosion process and failure mechanism of CMAS at 1300°C. Moreover, the analysis of residual CMAS and corrosion products was conducted to evaluate the discrepancies in CMAS corrosion behavior among the various compositions.

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高熵工程促进稀土铪的热性能和耐腐蚀性能

稀土铪因其出色的高温相稳定性和低热导率而备受关注。然而，它们仍然存在热膨胀率低和钙镁铝硅酸盐（CMAS）耐腐蚀性差的缺点。本研究采用高熵工程和组分设计合成了三种高熵铪酸盐（La0.2Ce0.2Nd0.2Gd0.2T0.2）2Hf2O7（T = Dy、Ho、Tm）以及一种单组分铪酸盐 Nd2Hf2O7，旨在制备综合性能优异的热障涂层。测试结果表明，高熵成分具有优异的热性能。重点是阐明 CMAS 在 1300°C 下的腐蚀过程和失效机理。此外，还对残余 CMAS 和腐蚀产物进行了分析，以评估不同成分之间 CMAS 腐蚀行为的差异。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.

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