Abradable ytterbium disilicate environmental barrier coatings: A story of CMAS and combined CMAS-erosion performance

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

Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131502

A. Lynam , A. Rincon Romero , B. Zhang , S. Lokachari , F. Xu , G.J. Brewster , G. Pattinson , T. Hussain

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引用次数: 0

Abstract

Abradable environmental barrier coatings (EBCs) can be implemented to realise crucial gains in gas turbine efficiency. The aim of this study was to better understand how abradable coatings perform when exposed to molten calcium magnesium alumino-silicates (CMAS), one of the key challenges facing current EBC design, and how this exposure affects the mechanical properties of the abradable coatings. In this study, three ytterbium disilicate (Yb₂Si₂O₇) abradable EBCs containing 8, 15 and 22 % porosity were deposited using atmospheric plasma spraying. These coatings were then exposed to CMAS at high temperatures for 0.5 h, 4 h and 100 h. The results show that increasing the overall level of porosity had minimal impact on the degree of CMAS infiltration and interaction observed in the coatings during exposure. Reaction with the CMAS occurred by a dissolution-precipitation mechanism, with a reprecipitated ytterbium disilicate phase and Yb-apatite (Ca₂Yb₈(SiO₄)₆O₂) crystals noted as the only reaction products. After 100 h CMAS exposure, the erosion resistance of the coatings was investigated. For all the coatings, ductile failure was the main erosion mechanism. The change in phase composition and microstructure after CMAS exposure led to an increase in erosion resistance for all the coatings.

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可研磨二硅化镱环境屏障涂层：CMAS和CMAS-侵蚀组合性能的故事

可研磨环境阻隔涂层（EBC）的应用可显著提高燃气轮机的效率。本研究旨在更好地了解可研磨涂层在暴露于熔融钙镁铝硅酸盐（CMAS）时的性能（这是当前 EBC 设计面临的主要挑战之一），以及这种暴露如何影响可研磨涂层的机械性能。在这项研究中，使用大气等离子喷涂沉积了三种二硅酸镱（Yb2Si2O7）可磨蚀 EBC，孔隙率分别为 8%、15% 和 22%。结果表明，在暴露过程中，增加孔隙率对涂层中观察到的 CMAS 渗入和相互作用程度的影响微乎其微。与 CMAS 的反应是通过溶解-沉淀机制发生的，沉淀的二硅酸镱相和镱-磷灰石（Ca2Yb8(SiO4)6O2）晶体是唯一的反应产物。在 CMAS 暴露 100 小时后，对涂层的抗侵蚀性进行了研究。所有涂层的主要侵蚀机制都是韧性破坏。在 CMAS 暴露后，相组成和微观结构的变化导致所有涂层的抗侵蚀性增强。

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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.