THE ADHERENCE OF A ZrO2/20%Y2O3 CERAMIC COATING ON A Ni BASE SUPER ALLOY FOR TURBINE BLADES APPLICATION.

Atmospheric plasma spraying (APS) is a widely used deposition method for obtaining variable thickness coatings on surfaces with different degrees of complexity. This paper presents a concept of thermal barrier coating which consists of a ZrO2/20%Y2O3 ceramic top layer and a Ni-22wt%Cr-10wt%Al-1wt%Y bond layer, both deposited by atmospheric plasma spraying (APS) on a Ni based super alloy. The analyzed samples were obtained by thermal deposition with the METCO 7 MB plasma jet installations. The paper analyzes the adhesion of the deposited coating on the base material. The adherence test was performed using the "scratch" method with UMTR 2M-CTR type tribometer. To assess the surface roughness measurements were conducted using Form Talysurf Intra system, manufactured by Taylor Hobson LEICESTER, ENGLAND. Highlighting and interpretation of the results were performed using scanning electron microscopy with Quanta 200 3D DUAL BEAM electron microscope. [ABSTRACT FROM AUTHOR]

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