Ultrasonic layer-by-layer treatment of PN85Y15 coating as a way to increase wear resistance of friction pair with bronze

Tribotechnical tests on wear resistance of friction pairs "coating PN85Y15 - bronze BrB₂", at loads of 100 and 300 N, sample rotation speed of 300 rpm, with lubricant Lukoil Luxe 5W40 have been carried out. It is shown that the plasma coating applied to steel 45 together with layer-by-layer ultrasonic treatment (UST) with the power of 200 W, in comparison with the coating with UST with the power of 400 W and without UST, had a higher adhesion to the base metal and sufficient porosity, which working with lubricant provided the crankshaft with increased lubricity, formation of favourable compressive residual stresses, formation in the coating of a two-component structure of large (~40 μm) granules and small (~1–7 μm) superhard intermetallic particles of phases Fe₂Al₅, which filled surface imperfections and reduced the coating roughness by 2 times, reduced the friction coefficient by 2 times, weight wear by 12 times and contact temperature by an average of 5 °C.