Water vapor corrosion and cyclic oxidation behavior of SiCf/SiC coated with Si/YbDS-YbMS/YbMS/LMA coating

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-04-01 Epub Date: 2025-02-05 DOI:10.1016/j.matchar.2025.114821

Gui Li , Longhui Deng , Jianing Jiang , Ying Xiong , Wenbo Chen , Xueqiang Cao

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Abstract

The water vapor corrosion behavior of SiC_f/SiC uncoated and coated with plasma sprayed Si/YbDS-YbMS/YbMS/LMA coating was investigated at 1200 °C in 90 %H₂O-10 %O₂ environment. Some pores were formed at the SiO₂ layer due to the volume shrinkage and volatilization of gas, which cannot prevent the diffusion of oxygen and water vapor. The results about bending strength test indicated that the preparation of coating improve the flexural strength of SiC_f/SiC substrate. The bonding strength tests indicated that the de-bond was occurred at the interface between Si and SiC_f/SiC due to the existence of weak bond in environmental barrier coatings. Furthermore, the thermal shocking behavior of coated SiC_f/SiC was tested 1200 °C. Through comparative analysis of microstructure and porosity, it is found that both viscous flow and solid phase sintering contribute to crack healing. During heat treatment, the vertical crack was formed in the coating due to the recrystallization of amorphous phase and thermal mismatch. The vertical cracks further extend to surface of Si layer due to the release of thermal mismatch stress during water vapor corrosion and thermal shocking test.

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Si/YbDS-YbMS/YbMS/LMA涂层对SiCf/SiC的水蒸气腐蚀和循环氧化行为

研究了等离子喷涂Si/YbDS-YbMS/YbMS/LMA涂层在1200℃、90% h2o - 10% O2环境下的水蒸气腐蚀行为。由于气体的体积收缩和挥发，在SiO2层上形成了一些孔隙，不能阻止氧气和水蒸气的扩散。抗弯强度试验结果表明，涂层的制备提高了SiCf/SiC基体的抗弯强度。结合强度测试表明，由于环境屏障涂层中存在弱结合，导致Si与SiCf/SiC之间的界面发生脱键。在1200℃下测试了SiCf/SiC涂层的热冲击性能。通过对微观组织和孔隙率的对比分析，发现粘滞流动和固相烧结都有助于裂纹的愈合。在热处理过程中，由于非晶相的再结晶和热失配，涂层中形成了垂直裂纹。在水蒸气腐蚀和热冲击试验中，由于热失配应力的释放，垂直裂纹进一步延伸到硅层表面。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.