Silica sacrificing effect against water vapor in multilayer environmental barrier coatings

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-03-10 DOI:10.1016/j.surfcoat.2025.132027

Hongkang Ou, Kaifei Fan, Lingxiang Guo, Yuyu Zhang, Bing Liu, Ting Xu, Jia Sun, Qiangang Fu

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Abstract

An environmental barrier coating (EBC) with the alternative multilayer structure was fabricated by plasma-sprayed ZrO₂-modified Yb₂SiO₅ and MoSi₂ as sublayers. The water-vapor corrosion test at 1500 °C is up to 100 h revealing a structure transformation from ZrO₂-Yb₂SiO₅ coating in which MoSi₂ was the sublayer to ZrO₂-Yb₂Si₂O₇ coating in which SiO₂ was the sublayer. By sacrificing the SiO₂ phase, a structural evolution emerged from dissolved SiO₂ to lamellar pores with volatilization of SiO₂. Layer-by-layer spallation avoided the complete delamination of the composite coating, and the sacrificing of SiO₂ can inhibit the inward invasion of oxygen and water vapor. The enhanced water vapor corrosion resistance and oxygen barrier effect of the multilayer coating contributed to the thin TGO-thickness of alternative multilayer EBC, as well as the long service life.

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通过等离子喷涂 ZrO2 改性 Yb2SiO5 和 MoSi2 作为底层，制备了一种具有替代性多层结构的环境阻隔涂层（EBC）。在 1500 °C 下进行了长达 100 小时的水蒸气腐蚀试验，结果表明涂层结构从以 MoSi2 为子层的 ZrO2-Yb2SiO5 涂层转变为以 SiO2 为子层的 ZrO2-Yb2Si2O7 涂层。通过牺牲 SiO2 相，结构发生了演变，从溶解的 SiO2 到随着 SiO2 的挥发而形成的片状孔隙。逐层剥落避免了复合涂层的完全分层，牺牲 SiO2 可抑制氧气和水蒸气的侵入。多层涂层增强的抗水蒸气腐蚀性和氧气阻隔效果使替代多层 EBC 的 TGO 厚度更薄，使用寿命更长。

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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.