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

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub 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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引用次数: 0

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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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.