Investigation of microstructural and mechanical properties of MCrAlY coatings produced by detonation gun (D-Gun) and super sonic plasma spray (SAPS) coating techniques

Thermal spray coatings have been widely utilized in various industrial applications against surface damages such as wear corrosion and oxidation. In this study, the high temperature wear behavior of MCrAlY coatings, deposited with detonation gun (D-Gun) and supersonic plasma spray (SAPS) thermal spraying techniques on Inconel 718 nickel based substrates, was investigated. To understand the high temperature wear behavior of the fabricated coatings, the wear tests were performed under varying temperatures and normal loads. The microstructural, mechanical and surface properties of the produced MCrAlY coatings were examined before and after the wear tests. Scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), microhardness and 3D topography of the produced and worn samples were comparatively evaluated. The high temperature wear resistance of the coatings was found to highly depend on the deposition technique used, microstructural characteristics of the coatings as well as the wear mechanism that arises following the wear tests.