Journal
CORROSION SCIENCE
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110174
Keywords
Rare-earth silicates; Environmental barrier coatings; CMAS corrosion behaviors; Corrosion mechanisms
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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The corrosion behaviors and mechanisms of plasma-sprayed X1-Gd2SiO5 and X2-RE2SiO5 environmental barrier coatings against CMAS melts at 1400°C were investigated. The results showed that the RE2SiO5 coatings dissolved into CMAS melts and formed a continuous apatite phase layer at the interface. In addition, garnet phase was observed only in the X2-Er2SiO5 coating. The corrosion resistance of RE2SiO5 was affected by its microstructure and RE ionic radius.
The corrosion behaviors and mechanisms of plasma-sprayed X1-Gd2SiO5 and X2-RE2SiO5 (RE=Y, Er) environmental barrier coatings against CMAS melts at 1400 C were explored. Results showed that the RE2SiO5 coatings dissolved into CMAS melts and formed a continuous dense layer of apatite phase at the interface, while garnet phase was only found in the X2-Er2SiO5 coating. The recession of RE2SiO5 was related to its microstructure and RE ionic radius. The RE2SiO5 with X2 phase and smaller RE ionic radius exhibited better corrosion resistance due to its more stable crystal structure, lower reactivity with CMAS and easier to form garnet phase.
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