Journal
CORROSION SCIENCE
Volume 197, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.110069
Keywords
Environmental barrier coating; CMAS corrosion; Yb2SiO5; Yb2Si2O7
Funding
- National Science and Technology Major Project [2017-VI-0020-0092]
- Shanghai Sailing Program [19YF1453900]
- Natural Science Foundation of Shanghai [20ZR1465700]
- Basic Research of the Ministry of Science and Tech-nology of the Chinese Academy of Sciences [CXJJ-21S029]
- Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing (Yantai) [AMGM2021A09]
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This study investigated the reaction behaviors and corrosion mechanisms of tri-layer Yb2SiO5/Yb2Si2O7/Si EBCs against CMAS melts at high temperatures. The results showed that the reaction temperature had a significant impact on the corrosion behaviors of the EBCs, with the Yb2SiO5 top layer exhibiting better corrosion resistance.
The reaction behaviors and corrosion mechanisms of the tri-layer Yb2SiO5/Yb2Si2O7/Si EBCs against CMAS melts were explored at 1300-1400 degrees C for 25-50 h. Results showed that the reaction temperature possessed a more prominent impact on the corrosion behaviors of the EBCs. The Yb2SiO5 top layer dissolved into CMAS melts and reprecipitated garnet and fine apatite particles, while the Yb2Si2O7 interlayer formed coarse apatite particles, which accelerated the corrosion reaction. The Yb2SiO5 top layer showed better corrosion resistance, which was related to the more stable crystal structure, less oxygen vacancies and easier formation of garnet.
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