Abstract
In this study, plasma spraying methods with 100 % Al₂O₃ (AT0), 87 % Al₂O₃ + 13 % TiO₂ (AT13), and 60 % Al₂O₃ + 40 % TiO2 (AT40) coatings were applied to the surface of aluminum alloy (AA 5083). After the coating processes, the structural analyses of the samples were performed using an XRD device. The thicknesses of the obtained coatings were measured with a DURAMIN-40 M1 MSO-04 device. The surface hardness values of the samples were determined using a microhardness testing device with parameters of 100 g load and 15 seconds duration. Scratch tests to determine the adhesion of the coatings to the substrate were conducted using a UMT-2MT testing device. Additionally, the surface roughness values of the samples were measured with a PCE-RTE 2000 device. The wear behavior of the samples after the coating processes was examined using the UMT-2MT testing device. The surface morphologies of the samples and the surfaces after wear tests were analyzed in detail using an SEM device. According to the research results, the highest coating thickness was obtained in AT13-coated samples (512 μm), while the lowest coating thickness was measured in anodized samples (47 μm). In the scratch tests, the best performance was observed in AT13-coated samples (52 N), while the lowest performance was determined in AT13-coated samples (36 N). It was observed that all coating processes resulted in an improvement in wear resistance.

Key words
wear, scratch test, SEM, XRD

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