Tribological exams had been performed employing a ball-on-disc T-eleven tester. The balls were being fabricated from metal, While the discs had been made of metal, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The outline of the device and also the procedures has been presented from the literature (Szczerek and https://irvingy725ubi7.blog2freedom.com/profile