Fretting wear of composite ceramic coating produced on D16 aluminum-based alloy using microarc oxidation

The mechanism of the wear of a composite ceramic coating, which has been produced on the D16 aluminum-based alloy using microarc oxidation, under low-amplitude reciprocal friction (fretting) is studied. The ball-on-plane arrangement in which a diamond ball slides reciprocally against a flat specimen covered with the microarc-oxidation coating is considered. The three following regions of the fracture of the coating have been identified: the moderate wear range, which is characterized by a constant wear rate and in which a smoothed wear spot is formed; the severe wear range, which is characterized by the partial delamination of the top layer of the coating; and the extreme wear range, which is characterized by the cracking of the coating through its entire thickness up to the metal. Based on the experimental results, the boundary of the transition to the inoperative region of the extreme wear of the coating has been determined over the entire ranges of the load and displacement under study.