Tribological exams were performed employing a ball-on-disc T-11 tester. The balls had been product of metal, whereas the discs were being made of steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The outline from the system as well as the techniques has long been offered during the literature (Szczerek https://ankey825vdj8.bloginder.com/profile