Experimental Study Of The Wear Resistance Of A Coated Rotor In A Rotary Engine Using The Galvanic Plasma Method


  • S.V. Sergeyev , M.SH. Al-Bdeiri, D.A. Kolesnikov and S. O. Baranov


This study is focused to studying the possibility of using a galvanic plasma method of the piston head made of aluminum-silicon alloy. The coatings, which were applied in a water electrolytic bath, consist of alpha, gamma and mullite phase Al2O3, showed very good wear resistance. The tribological properties of the different surfaces were evaluated using the method of (a fixed pin resting on a rotating disc) method. The composition of electrolytes with different current density and different current modes create differences in surface roughness, hardness, and thickness of the coating, which have a big effect on the wear of sliding surfaces. Scanning electron microscope images of the substrate did not detect any visible wear on the surface in the area of contact or coating layering. This study shows the importance of porosity, which promotes oil retention, which significantly affects the rate of wear of the coating. The results of the wear tests were used to estimate the wear resistance of different layers obtained by the galvanic plasma method (GPM) method, as well as to create a wear model. Rougher coatings may be desirable in low oil conditions because they have a lower friction coefficient. This can be explained by the fact that they have an oil-retaining structure with a wide variety of micro topography. The results showed the hardness of the formed layer at 22 A/dm2 was the highest and had the best wear resistance, while the layer formed at 30 A / dm2 had the highest thickness and the highest porosity among all samples.