Water Vapor Corrosion Behavior of Yb2SiO5 Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition
Source abstract
Abstract
Tri-layer Si/mullite/Yb2SiO5 environmental barrier coating (EBC) was prepared on the SiCf/SiC ceramic matrix composite (CMC) by plasma spray-physical vapor deposition (PS-PVD). The EBC samples were carried out with water vapor corrosion at 1300 °C for 200 h. After steam corrosion, Yb2SiO5 layer forms a gradient porous structure. This is mainly due to the inclusion of SiO2-rich layer which is precipitated from the gasification inside the coating and existing a small amount of Yb2O3 separately. During the corrosion process, water vapor infiltrates into the coating and reacts with the SiO2 and Yb2O3 to generate volatile substances. This forms a porous structure to make the coating brittle, resulting in mud cracks finally. In addition, the results show that the Yb2SiO5 can react with the water vapor at the coating surface, forming an Yb2Si2O7 top layer.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · High-Temperature Coating Behaviors · Semiconductor materials and devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
National Engineering Laboratory for Modern Materials Surface Engineering Technology & The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China
Shenzhen Customs Industrial Products Inspection Technology Center, Shenzhen 518067, China
Chengdu Holy (Group) Industry Co. Ltd., Chengdu 610041, China
Yunnan Yunlv Yongxin Aluminum Company Limited, Honghe 661017, China
Funding
National Key Research and Development Project · Guangdong Academy of Sciences Program · Natural Science Foundation of Guangdong Province · Guangzhou Technical Research Program · National Natural Science Foundation of China · Guangdong Technical Research Program
References (25)
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