Abstract
Because of thermal barrier properties, ceramic-based coatings are widely used for the design of components at high temperature applications. Therefore, 304 L stainless steel substrates were coated with MgZrO₃ coatings using atmospheric plasma spray technique. These coatings consist of a transition from the metallic bond layer to cermet and from cermet to the ceramic layer. Produced samples were characterized by optical microscope, scanning electron microscope and x-ray diffraction techniques. Wear tests were carried out in ball-on-disc system at ambient and dry friction conditions under 2 N load for 0.1, 0.15 and 0.2 m/sec sliding speeds. The results showed that the friction coefficient values changed between 0.250 and 0.259 depending on sliding speed. The specific wear rate values rise also from 3.4470 to 5.5535 x 10^-3 . mm³ / N . m with increasing sliding speed. Detailed examination of formed wear tracks on sample surfaces showed plastic deformation, materials transfer and microcracks.

Key words
tribology, wear, friction, plasma spray, MgZrO₃ coatings

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