MICROSTRUCTURE CHARACTERISTICS OF DETONATION GUN SPRAYED CoNiCrAlY COATINGS
Overlay coatings are often chosen from the MCrAlY family of alloys. Overlay coatings are deposited by methods such as atmospheric plasma spraying (APS), high velocity oxy-fuel spraying (HVOF) and cold gas dynamic spraying (CGDS). CoNiCrAlY coatings are widely used for protection of superalloy components against harsh environments under service conditions in the hot sections of gas turbine engines. Detonation gun (D-gun) spraying is a promising process to produce CoNiCrAlY coatings with low porosity and excellent properties in gas turbine applications of thermal barrier coatings (TBCs) such as turbine blade, vanes or combustion chambers. In this study, microstructural properties of CoNiCrAlY coatings produced by detonation gun spraying (D-gun) were investigated. CoNiCrAlY coatings were investigated and evaluated using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) analysis and X-ray diffractometer (XRD).
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