Abradable ytterbium disilicate environmental barrier coatings: A study of steam, CMAS and combined steam-CMAS corrosion

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-05-18 DOI:10.1016/j.jeurceramsoc.2025.117544

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

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引用次数: 0

Abstract

Abradable environmental barrier coatings (EBCs) are essential for improving gas turbine efficiency with ceramic matrix composites (CMCs). This study examined ytterbium disilicate (Yb₂Si₂O₇ or YbDS) abradable EBCs with 8 %, 15 %, and 22 % porosity, deposited via atmospheric plasma spraying. Coatings were exposed to steam, CMAS, and combined steam-CMAS at 1350 °C for 100 hr. Results showed that porosity had minimal impact on corrosion resistance. Steam exposure formed a thin ytterbium monosilicate (Yb₂SiO₅ or YbMS) layer, while CMAS caused dissolution-precipitation, forming reprecipitated Yb₂Si₂O₇ and Yb-apatite (Ca₂Yb₈(SiO₄)₆O₂). Combined exposure increased CMAS penetration depth by 25 %, enhanced Yb-apatite formation, and introduced ytterbium aluminium garnet (Yb₃Al₅O₁₂, YbAG). These findings demonstrate that the interaction of CMAS and steam accelerates coating degradation, highlighting the need for optimized phase composition and microstructure to enhance abradable EBC durability under turbine-relevant conditions.

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耐磨性二硅酸镱环境屏障涂层：蒸汽、CMAS及蒸汽-CMAS复合腐蚀的研究

耐磨性环境屏障涂层是提高陶瓷基复合材料燃气轮机效率的关键。本研究检测了通过大气等离子喷涂沉积的具有8 %、15 %和22 %孔隙度的二硅酸钇（Yb2Si2O7或YbDS）可磨EBCs。涂层在1350°C下暴露于蒸汽、CMAS和蒸汽-CMAS组合中100 hr。结果表明，孔隙率对耐蚀性的影响很小。蒸汽暴露形成薄的单硅酸钇（Yb2SiO5或YbMS）层，而CMAS引起溶解沉淀，形成再沉淀的Yb2Si2O7和yb -磷灰石（Ca2Yb8(SiO4)6O2）。复合暴露使CMAS穿透深度增加了25 %，增强了yb -磷灰石的形成，并引入了钇铝石榴石（Yb3Al5O12, YbAG）。这些发现表明，CMAS和蒸汽的相互作用加速了涂层的降解，突出了优化相组成和微观结构以提高可磨损EBC在涡轮相关条件下的耐久性的必要性。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.