FRICTION PROPERTIES OF MАO COATINGS ON ALUMINUM ALLOYS

Aluminum alloys are widely used in mechanical engineering due to their physical and properties. However, low wear resistance burr limit use friction nodes. In this regard, parts made of aluminum operating under conditions sliding require surface strengthening, which determines the parameters. Research works direction allow increasing reliability service life Ensuring compatibility pairs allows reducing coefficient and, as a result, increase resistance. One effective methods forming wear-resistant coatings on is method micro-arc oxidation (MAO). The discharges highly concentrated energy sources create for high-temperature electrotechnical processes phase transformations layer makes it possible form structures based oxides metals, provides qualitatively new properties: high hardness, resistance, corrosion various environments. oxide bearings mainly Information antifriction properties oxide-based limited. purpose work determine MAO-coatings D16 alloy pair with cast iron, steel MAO-coating oil water lubrication, find out feasibility using MAO technology bearings. formation was carried an alkaline-silicate electrolyte cathodic-anodic mode. structure morphology working surface, investigated. benefit available porosity coating, 5-10% contributes retention lubricant zone, shown. composition, hardness were studied determined SMC-2 machine according "disk-pad" scheme when lubricants; load varied from 0.2 2 kN, nominal pressure 1 11 MPa. It established that coating has crystalline structure, composition modifications (α-Al2O3 γ- Al2O3), 18000-20000 gray iron - MAO-coating, decreases value 0.01 0.013 lubrication conditions. found anti-friction manifested both water. coating-coating case explained by hydrophilic contacting surfaces, recommend them (liners) hydroturbines. A conclusion drawn regarding reasons samples. Keywords: alloy, steel, treatment, crystal oxides, thickness, coefficient,