Effects of Laser-Remelting on the Microstructure, Hardness and Oscillating Wear Resistance of Atmospheric Plasma Sprayed Alumina-Rich Coatings

Thermally sprayed ceramic coatings such as alumina have a specific microstructure characterized by porosity and microcracks. In addition, process-related phase transformation from α-Al2O3 to γ-Al2O3 typically occurs, which affects the properties of compared sintered alumina. previous study, simultaneous additions Cr2O3 TiO2 already extended improved property profile pure coating (i.e., sliding wear resistance corrosion against 1N H2SO4). Depending on powder material used, composition differs considerably, influencing profile. Chemical integration through reactive bonding promises previously untapped potential for improvement. this these alumina-rich ternary oxide are remelted laser, effect different parameters speed, laser power or distance macro- is investigated. For purpose, both light microscopic SEM examinations used well determination XRD element distribution EDS. The created microstructures studied with respect hardness oscillation resistance.