The aim of the study is to evaluate the friction and wear behavior of high-strength alloys Ti-6Al-7Nb used in femoral stem and\ncompare it with a Ti-6Al-4V alloy cylindrical bar corresponding to ISO 5832-3 part 3/01-07-199 standard.The tribological behavior\nwas investigated by wear tests, using ball-on-disc and pin-on-disc tribometers. These tests consisted of measuring the weight loss\nand the friction coefficient of samples. The oscillating friction and wear tests have been carried out in ambient with oscillating\ntribotester in accordance with standards ISO 7148, ASTMG99-95a, and ASTMG133-95 under different conditions of normal loads\n(3, 6, and 10N) and sliding speeds (1, 15, and 25mm?s?1). As counter pairs, a 100Cr6 steel ball with 10 mm in diameter was used.\nResults show that the two alloys had similar friction and wear performance, although their grain structures and compositions are\ndifferent. Occurrence of large frictional occurred, is probably caused by formation and periodic, localized fracture of a transfer\nlayer. Higher friction with larger fluctuation and higher wear rate was observed at the higher siding speed. The Ti-6Al-4V wear\nmechanism transforms from ploughing and peeling off wear at low sliding speed to plastic deformation and adhesive wear.
Loading....