期刊
CERAMICS INTERNATIONAL
卷 48, 期 16, 页码 23638-23648出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.05.012
关键词
Dense; Open pore; Infiltration; Water vapor resistance; Environmental barrier coatings (EBCs)
资金
- Industry-University-Research project funded by the Aero Engine Corporation of China [HFZL2019CXY015]
- National Natural Science Foundation of China [51801034]
- Guangdong Province Outstanding Youth Foundation [2021B1515020038]
- Guangzhou Technical Research Program [201906010015]
By infiltrating aluminum, a dense environmental barrier coating was designed to prevent rapid permeation of oxidants and improve corrosion resistance.
A dense environmental barrier coating (EBC) was designed via aluminum infiltration into open pores or cracks to eliminate premature coating failure induced by the rapid permeation of oxidants through these pores. The water vapor corrosion performance of the EBC with and without aluminum infiltration was investigated at 1350 degrees C for 300 h under flowing 50%H2O-50%O2 gas. The infiltrated coating exhibited decrease silicon loss by more than 80%, almost no phase decomposition, and no continuous thermally grown oxide (TGO), furthermore, TGO thickness at the crack-root decreased by similar to 90%. The excellent resistance is primarily attributed to the channel pores being filled with aluminum, which eliminates the rapid permeation of oxidants. In addition, a continuous refractory ytterbium aluminum garnet (YbAG) layer was formed in situ on the EBC surface, this layer exhibited sufficient stability in steam, rendering the EBC less permeable to oxidants.
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