Journal
CORROSION SCIENCE
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110217
Keywords
Environmental barrier coatings; High-entropy pyrosilicates; CMAS corrosion mechanisms; Rare earth cations
Funding
- National Key Technologies Research and Development Program of China [2018YFB0704400]
- Shanghai Technical Platform for Testing on Inorganic Materials [19DZ2290700]
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High-entropy pyrosilicates prepared by the solid-phase method show better protective performance in CMAS corrosion tests, as they can more easily precipitate apatite to protect the materials.
To combine the advantages of the thermal expansion coefficient and excellent corrosion resistance to calcium-magnesium-alumino-silicate (CMAS), two types of high-entropy pyrosilicates ((Yb0.2Y0.2Lu0.2Ho0.2Er0.2)(2)Si2O7 and (Yb0.25Lu0.25Ho0.25Er0.25)(2)Si2O7) and two single-component pyrosilicates (Yb2Si2O7 and Lu2Si2O7) were prepared by the solid-phase method. CMAS corrosion resistance test results showed that the high-entropy pyrosilicates that form a stable beta phase could precipitate apatite (Ca2RE8(SiO4)(6)O-2) more easily than Yb2Si2O7 and Lu2Si2O7 during the corrosion process to protect the block from CMAS. The results provide a theoretical basis for the selection of rare earth elements in high-entropy pyrosilicate according to the radius of different rare earth cation.
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