Tribological exams had been performed using a ball-on-disc T-11 tester. The balls were made from steel, Whilst the discs have been made of metal, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description with the gadget along with the techniques has been supplied from the literature (Szczerek and Tuszyński https://charless614tbh7.blogsuperapp.com/profile