Comparison on the Torsional Fretting Wear of Nitrogen Ion Implanted Pure Titanium and Ti6Al7Nb Alloys in Bovine Serum
纯钛与Ti6Al7Nb合金氮离子注入层在小牛血清溶液中的扭动微动磨损试验研究

Pure titanium and Ti6Al7Nb alloys alloys were implanted by 50 keV N+ ions with different implanting dosage in high energy ion implantation and enhanced deposition system. Torsional fretting wear of un-treated and plasma implantation nitride titanium alloys flats against ZrO2 ball (with a diameter of 25.2 mm) were carried out under a simulated physiological condition. With analyses of the frictional kinetics behaviors, the X-ray diffraction, Raman spectroscopy, 3-D profiler,SEM morphologies, the damage characteristics of the surface modification layer and its substrate were discussed in detail.The results show that the plasma implantation nitride can improve its surface properties and the resistance of torsional fretting wear can be improved obviously.The wear mechanism of the pure titanium and Ti6Al7Nb were oxidation wear and delaminlation, the ploughing of the modification layers.