Abstract
This paper explored the calcium–magnesium–aluminosilicate (CMAS) corrosion resistance of Al2O3/Y3Al5O12(YAG) directionally solidified eutectic (DSE) at 1500 °C for 4–100 h and disclosed the reaction process dominated by dissolution, precipitation, and in-situ growth and densification mechanisms. The recession depth of Al2O3/YAG DSE after corrosion at 1500 °C for 100 h is approximately 130 µm, indicating its outstanding CMAS corrosion resistance among competing high temperature materials. The current result highlights the strategy to in-situ initiation of protective dense layer against CMAS corrosion and inspires the design of new high temperature structural components or environmental barrier coating in turbine engine.
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