[1]李乾,曹鑫鑫,韩桂芳.Si/Yb2Si2O7环境障涂层在CMAS与Na2SO4混合熔盐中的腐蚀行为[J].中国材料进展,2026,45(08):694-702.[doi:10.7502/j.issn.1674-3962.202605028]
　LI Qian,CAO Xinxin,HAN Guifang.Corrosion Behavior of Si/Yb2Si2O7 Environmental Barrier Coating in Mixed CMAS and Na2SO4 Molten Salts[J].MATERIALS CHINA,2026,45(08):694-702.[doi:10.7502/j.issn.1674-3962.202605028]
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Si/Yb2Si2O7环境障涂层在CMAS与Na2SO4混合熔盐中的腐蚀行为()

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
45
期数:
2026年08
页码:
694-702
栏目:
出版日期:
2026-08-08

文章信息/Info

Title:
Corrosion Behavior of Si/Yb2Si2O7 Environmental Barrier Coating in Mixed CMAS and Na2SO4 Molten Salts
文章编号:
1674-3962(2026)08-0694-09
作者:
李乾; 曹鑫鑫; 韩桂芳
1. 山东大学材料科学与工程学院，山东 济南 2500612. 上海大学材料科学与工程学院，上海 200072
Author(s):
LI Qian; CAO Xinxin; HAN Guifang
1. School of Materials Science and Engineering，Shandong University，Jinan 250061，China2. School of Materials Science and Engineering,Shanghai University,Shanghai 200072，China
关键词:
环境障涂层; Yb2Si2O7; CMAS; Na2SO4; 混合熔盐腐蚀
Keywords:
environmental barrier coatings;  Yb2Si2O7;  CMAS;  Na2SO4;  mixed molten salt corrosion
分类号:
TB304;TB33;V261.93+3
DOI:
10.7502/j.issn.1674-3962.202605028
文献标志码:
A
摘要:
环境障涂层（EBCs）保护下的SiC陶瓷基复合材料作为热端部件在航空发动机上得到应用，但燃气和服役环境中的钙-镁-铝-硅酸盐（CMAS）与Na盐等易侵蚀热端部件。研究对比了Si/Yb2Si2O7 EBCs涂层在1350 ℃条件下分别经单一CMAS1、单一Na2SO4，以及CMAS1+Na2SO4与CMAS2+Na2SO4混合熔盐侵蚀10 h后的微观组织演化规律。结果表明：混合熔盐体系较单一CMAS粘度低，在Yb2Si2O7表面原位生成棒状磷灰石结构反应层，消耗了熔体中的Ca2+和Si4+，降低了熔盐渗透性；同时，Na+因溶解于玻璃相中导致其渗透性下降，因此混合熔盐的腐蚀程度低于单一Na2SO4熔盐环境，展现出“1+1<2”的腐蚀协同减缓效应。研究揭示了多盐共存下材料腐蚀进程由熔盐渗透能力与界面反应层自生成能力的动态竞争所主导，为高性能EBCs设计提供了实验依据与理论支撑。
Abstract:
SiC-based ceramic matrix composites protected by environmental barrier coatings (EBCs) are applied as hot-section components in aero-engines.However, the aggressive gas environment and service environment contain calcium-magnesium-aluminosilicate (CMAS) and sodium salts that easily attack the hot-section components. In this study, the microstructural evolution of the Si/Yb2Si2O7 EBC coating was compared after being exposed to pure CMAS1, pure Na2SO4, and mixed molten salts of CMAS1+Na2SO4 and CMAS2+Na2SO4 at 1350 ℃ for 10 h, respectively. The results show that in the mixed molten salt systems, the reduced viscosity promotes the in-situ formation of a rod-like apatite reaction layer on the Yb2Si2O7 surface, which consumes Ca2+ and part of the SiO2 in the melt, thereby decreasing the fluidity of the molten salt. Meanwhile, Na+ is dissolved into the glass phase,resulting in a reduction in overall melt penetrability. Consequently, the corrosion intensity of the mixed molten salts is significantly lower than that of the pure Na2SO4 molten salt environment, demonstrating a “1+1<2” synergistic corrosion mitigation effect. This study reveals that in multi-salt coexisting environments, the material corrosion process is governed by the dynamic competition between the infiltration capability of the molten salt and the self-forming ability of the interfacial reaction layer. The findings provide experimental evidence and theoretical support for the design of high performance EBCs.

备注/Memo

备注/Memo:
收稿日期：2026-05-28修回日期：2026-06-26第一作者：李乾，男，2002年生，硕士研究生通讯作者：韩桂芳，女，1979年生，教授，博士生导师，Email:gfhan@sdu.edu.cn
更新日期/Last Update: 2026-06-30