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Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings

Lars Steinberg,Christoph Mikulla,Ravisankar Naraparaju,Filofteia-Laura Toma, Holger Großmann,Uwe Schulz,Christoph Leyens

Wear（2019）

Cited 13|Views13
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Abstract
The development of CMAS (CaO–MgO–Al2O3–SiO2) -resistant thermal barrier coatings is an urgent issue, as the operating temperatures of aero-engines exceed the melting point of the CMAS. Application of alumina as top layer on 7YSZ coatings has shown promising CMAS resistance behavior. It reacts with the CMAS and crystallizes into new stable phases, which seals the CMAS penetration paths in the top layer to save the underlying 7YSZ layer from infiltration.
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Key words
TBC,Solid particle erosion,CMAS,Alumina,Suspension plasma spraying,Erosion testing
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