揭示了新型中熵Hf-Ta陶瓷热障涂层表面CMAS腐蚀机理

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-04-18 DOI:10.1016/j.apsusc.2025.163310

Fanwei Meng , Fuxing Ye , Tianyuan Luo , Yuan Yao

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引用次数: 0

摘要

熵概念的引入逐渐为提高陶瓷材料的性能提供了新的视角。本研究研究了中熵陶瓷 (Y0.3Gd0.3Yb0.4)7(Hf0.5Ta0.5)6O24 在 1300 ℃ 至 1500 ℃ 温度范围内表面的 CMAS 腐蚀行为。在腐蚀过程中，由于较大的离子半径差引起了较严重的晶格畸变，物质的扩散和迁移受到了抑制。缓慢的扩散削弱了 CMAS 的腐蚀反应，从而提高了耐腐蚀性。此外，Ta-O 键的优先断裂导致预先生成 Ca2Ta2O7，而 Ca2Ta2O7 的形成焓较低。与稀土铪酸盐的比较显示，Ta 的掺杂延缓了磷灰石相的生成，从而提高了与 CMAS 熔体的腐蚀反应惰性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Unveiling CMAS corrosion mechanism on the surface of a novel mid-entropy Hf-Ta ceramic for thermal barrier coatings

查看原文本刊更多论文

Unveiling CMAS corrosion mechanism on the surface of a novel mid-entropy Hf-Ta ceramic for thermal barrier coatings

Introducing the concept of entropy has gradually provided novel perspectives for enhancing the properties of ceramic materials. In this study, the CMAS corrosion behavior on the surface of a mid-entropy ceramic (Y_0.3Gd_0.3Yb_0.4)₇(Hf_0.5Ta_0.5)₆O₂₄ within the temperature range from 1300 ℃ to 1500 ℃ was investigated. During corrosion, the diffusion and transport of matter were inhibited by the more severe lattice distortions induced by the large ionic radius difference. The sluggish diffusion weakens the CMAS corrosion reaction, improving corrosion resistance. Additionally, the preferential breakage of Ta-O bonds led to the pre-generation of Ca₂Ta₂O₇, which has a lower formation enthalpy. A comparison with rare earth hafnates reveals that the doping of Ta retards the generation of the apatite phase, thereby enhancing corrosion reaction inertness with CMAS melt.

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.