Influence of dovetail microstructures on adhesive tensile strength and morphology of thermally sprayed metal coatings

摘要: Abstract An approach for a reduction of weight and fuel consumption passenger cars consists in replacement grey cast iron by aluminium alloys as base material combustion engine blocks. Regarding the insufficient chemical resistance these to fuels with its additives, compounds thermally sprayed coatings are used cylinder linings. For machining service high connection strength between substrate coating is demanded. This can be gained predefined microstructuring surface attain local form fit coating. But, microstructured also influences morphology layer. Another possibility improve application primer basic investigations, spiral dovetail microstructures different pitches (200 µm – 500 µm) machined face turning using tools CVD diamond tippings. The substrates consist alloy EN AW-5754 their surfaces coated nickel-aluminium thickness about 200 produced high-velocity arc spraying. usually an iron-based analysed SEM 3D laser scanning microscopy. To determine adhesive tensile adhesion tests performed. results show that higher number structure elements per length increase strength, hardness oxide proportion Furthermore, reveal failure mechanisms compound depending on microstructure.