A study of mechanical capability and blood compatibility of Ti-O/Ti-N gradient films prepared by MPIII-D

Summary form only given, as follows. Summary form only given. Titanium oxide and titanium nitride gradient films were synthesized using metal plasma immersion ion implantation and deposition. An intelligent control system was developed to control the advance of the metal cathode source and to vary the gas composition by programmable logic control (PLC). Three different processes were used to fabricate gradient films. The mechanical properties of films synthesized on silicon wafers, titanium and low temperature isotropic carbon (LTIC) were investigated by nanoindentation tests, pin-on-disc wear experiments, and scratch testing. Analysis by X-ray diffraction (XRD) showed that the surface Ti-O layer of the films was a rutile structure. The gradient characteristics of the films were supported by qualitative analysis of secondary ion mass spectroscopy (SIMS). The thickness of films was about 5500-9000 A/spl ring/. Platelet adhesion experiments were used to determine blood compatibility of the films. Scanning electron microscopy (SEM) was employed to observe the wear and scratch traces. The results show that the films have good wear resistance and high adhesion strength. The adhesion force was up to about 66 N on metal substrate. Platelet adhesion was also observed by SEM and it shown that the adsorption and deformation of platelets on the synthesized Ti-O/Ti-N gradient films were significantly suppressed compared to platelets on LTIC.