Superior performance of Gd0.75Yb0.25PO4 in resisting CMAS + sea salt corrosion

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

Surface & Coatings Technology Pub Date : 2025-02-01 DOI:10.1016/j.surfcoat.2025.131739

Yuanpeng Wang , Xiufang Gong , Xiaohu Yuan , Lanxin Zou , Ruxue Wu , Bin Long , Wei Wang , Lei Guo

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Abstract

When aero-engines are operated in near-sea environments, the coexistence of calcium‑magnesium-alumina-silicate (CMAS) and sea salt (CMAS+SS) poses significant risks to the safety of thermal barrier coatings (TBCs). Therefore, it is urgent to develop TBCs resistant to CMAS+SS corrosion. In this study, a TBC candidate material Gd_0.75Yb_0.25PO₄ is found to reveal superior performance in resisting CMAS+SS corrosion. At high temperatures, Gd_0.75Yb_0.25PO₄ and CMAS+SS reacts to form a double-layer interface reaction layer, which has a lower sub-layer consisting of (Gd, Yb)-lean apatite and an upper sub-layer initially comprising transitional (Gd, Yb)-mid apatite that gradually evolves into (Gd, Yb)-rich apatite as the reaction progresses. The formation of the interface reaction layer increases the viscosity of the residual melt and suppresses melt penetration. The reaction layer reaches a stable structure rapidly, and remains tightly bound to the substrate with intact structural integrity during thermal cycling, enabling continued resistance against secondary sediment corrosion.

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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.