Superior CMAS corrosion resistance of high-entropy rare-earth disilicate environmental barrier coating for SiC coated C/C composites

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-07-10 DOI:10.1016/j.surfcoat.2025.132482

Guohui Chen , Yanqin Fu , Yulei Zhang , Jian Zhang , Jing’an Kong , Wenhan Gai

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引用次数: 0

Abstract

High-entropy rare-earth silicates are promising candidate materials for enhanced calcium‑magnesium-aluminosilicate (CMAS) resistance as next-generation environmental barrier coatings (EBCs). In this study, CMAS corrosion behaviors of plasma-sprayed high-entropy disilicate (Yb_0.2Lu_0.2Er_0.2Tm_0.2Sc_0.2)₂Si₂O₇ ((5RE_0.2)₂Si₂O₇) and Yb₂Si₂O₇ coatings were comparatively investigated at 1500 °C, to clarify the effect of high-entropy engineering on enhancing the CMAS corrosion resistance. After corrosion at 1500 °C for 1 h, the corrosion layer thickness of the (5RE_0.2)₂Si₂O₇ coating was 50 ± 12 μm, while that of the Yb₂Si₂O₇ coating reached 90 ± 15 μm. When the corrosion time was extended to 20 h, the Yb₂Si₂O₇ coating completely failed, but the (5RE_0.2)₂Si₂O₇ coating still maintained protective effect. The (5RE_0.2)₂Si₂O₇ coating exhibited superior corrosion resistance compared with the Yb₂Si₂O₇ coating, primarily attributed to the sluggish diffusion effect of high-entropy materials and reduced average rare-earth ion radius. A dense reaction layer interlaced with apatite and garnet was formed, effectively limiting the further penetration of CMAS. This work provides valuable insights for designing high-entropy coatings with exceptional anti-CMAS corrosion performance.

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SiC包覆C/C复合材料高熵稀土二硅酸环境屏障涂层具有优异的CMAS耐腐蚀性能

高熵稀土硅酸盐是增强钙镁铝硅酸盐（CMAS）抗性的有前途的候选材料，可作为下一代环境屏障涂层（ebc）。本研究对比研究了等离子喷涂高熵二硅酸盐（Yb0.2Lu0.2Er0.2Tm0.2Sc0.2）2Si2O7 （(5RE0.2)2Si2O7）和Yb2Si2O7涂层在1500℃下的CMAS腐蚀行为，以阐明高熵工程对提高CMAS耐腐蚀性的影响。1500℃腐蚀1 h后，（5RE0.2）2Si2O7涂层的腐蚀层厚度为50±12 μm， Yb2Si2O7涂层的腐蚀层厚度为90±15 μm。当腐蚀时间延长至20 h时，Yb2Si2O7涂层完全失效，但（5RE0.2）2Si2O7涂层仍保持保护作用。与Yb2Si2O7涂层相比，（5RE0.2）2Si2O7涂层具有更好的耐蚀性，这主要是由于高熵材料的扩散作用缓慢和稀土离子平均半径的降低。磷灰石和石榴石相互交织形成致密的反应层，有效地限制了CMAS的进一步渗透。这项工作为设计具有优异抗cmas腐蚀性能的高熵涂层提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.