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Abstract Calcium-magnesium-alumino-silicate (CMAS) attack is a significant failure mechanism for thermal barrier coatings (TBC). In this study, La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 (LZ7C3) TBC prepared… Click to show full abstract
Abstract Calcium-magnesium-alumino-silicate (CMAS) attack is a significant failure mechanism for thermal barrier coatings (TBC). In this study, La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 (LZ7C3) TBC prepared by electron-beam physical vapor deposition was found to be highly effective in resisting CMAS infiltration for prolonged durations (24 h, 1250 °C), while conventional Y 2 O 3 -stabilized ZrO 2 TBC was completely penetrated by molten CMAS within 30 min. This resistance was achieved through crystallization of CMAS as a result of high-temperature chemical interactions between LZ7C3 coating and CMAS glass. The crystalline products, mainly consisted of La-Ce apatite and C-ZrO 2 , tended to form a sealing layer and can effectively prevent CMAS from further infiltration.
Journal Title: Corrosion Science
Year Published: 2017
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