The appraisal of biotribological properties of DLC gradient film on titanium alloy substrate

Compared with the Ti6Al4V and UHMWPE tribocouples system, the friction and wear behaviour of diamondlike carbon (DLC) gradient film sliding against UHMWPE under dry friction and lubrication of 0.9%NaCl solution and Hank′s solution respectively were investigated. The distribution of carbon content and the adhesive strength of coatings were measured using second ion mass spectrum(SIMS) and sonicreflect scratch test,respectively.The morphologies of the worn specimens were studied utilizing scanning electric microscopy (SEM) and the wear mechanism was also analyzed. The results showed that the samples prepared using PSIIIBED were characterized by gradient distribution of composition and higher adhesive strength. Besides,DLC gradient film has the properties of low friction and wearresistance and the wear decreased with the increase of load value. 