Influence of Oxynitriding on Antifriction Properties of Ti-6Al-4V Titanium Alloy

摘要

The wear resistance of a plate-screw tribo pair used to fix bone fractures was investigated using the pin-on-plate configuration under conditions of dry friction and friction in Ringer's solution. The nitrided and oxynitrided plates of Ti-6Al-4V titanium alloy in friction pairs with Fe-18Cr-10Ni-1Ti stainless steel were used. It was determined that under dry friction conditions, regardless of load, the nitrided Ti-6Al-4V titanium alloy provides a lower friction coefficient than the oxynitrided one; friction is implemented according to the adhesive wear mechanism. The use of Ringer's solution during friction tests leads to an adhesive-oxidative wear mechanism that decreases the friction coefficient in friction pairs of nitrided (oxynitrided) Ti-6Al-4V titanium alloy-Fe-18Cr-10Ni-1Ti stainless steel. In addition, the oxidative portion in the wear mechanism for an oxynitrided surface is greater, which decreases the adhesive wear in such a friction pair.