暴露于 CMAS+ NaVO3 的等离子喷涂 Yb2Si2O7/Si 环境屏障涂层的腐蚀行为和失效机理

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

Journal of The European Ceramic Society Pub Date : 2024-10-20 DOI:10.1016/j.jeurceramsoc.2024.117005

Xunxun Hu , Yongguo Chen , Hongbo Guo , Huibin Xu

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引用次数: 0

摘要

航空发动机的使用环境复杂多变，环境屏障涂层通常会受到 CMAS 和熔盐的耦合腐蚀。阐明相关的腐蚀机理对保护环境屏障涂层具有指导意义。本研究探讨了大气等离子喷涂（APS）技术制备的典型 Yb2Si2O7/Si 涂层的 CMAS+NaVO3 (CN) 腐蚀行为。结果表明，CN 在 1200℃（低于 CMAS 的熔点）时完全熔化并均匀扩散。1200℃ 时，Yb2Si2O7/Si 涂层与氯化萘之间的相互作用产生了不连续的非均相石榴石相。在 1300 ℃ 时，反应产生了磷灰石反应层，但当反应时间延长至 50 小时时，磷灰石层逐渐溶解。此外，CN 熔体渗入整个 Yb2Si2O7 涂层，导致 Yb2Si2O7 层屈曲，并与硅层脱粘，最终导致 Yb2Si2O7/Si 涂层失效。

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Corrosion behaviors and failure mechanism of plasma sprayed Yb2Si2O7/Si environmental barrier coatings exposed to CMAS+ NaVO3

Aero-engine service environments are complex and variable, environmental barrier coatings are usually exposed to the coupled corrosion of CMAS and molten salt. Clarifying the relevant corrosion mechanisms is of guiding significance for the protection of environmental barrier coatings. In this study, the CMAS+NaVO₃ (CN) corrosion behavior of a typical Yb₂Si₂O₇/Si coating prepared by atmospheric plasma spray (APS) technique was explored. Results showed that CN was completely melted and uniformly spread at 1200℃, a temperature lower than the melting point of CMAS. Interaction between the Yb₂Si₂O₇/Si coating and CN produced a discontinuous non-stoichiometric garnet phase at 1200℃. At 1300 °C, the reaction produced an apatite reaction layer, but when the duration was extended to 50 h, the apatite layer was gradually dissolved. Moreover, the CN melt infiltrated into the entire Yb₂Si₂O₇ coating, causing buckling of the Yb₂Si₂O₇ layer and debonding with the Si layer, ultimately leading to failure of the Yb₂Si₂O₇/Si coating.

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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.