The examination of numerous studies devoted to titanium-carbon interactions shows that most domains of investigation are related to high temperatures (above 800 o C), for which the diffusion of carbon within titanium is mainly controlled by carbon diffusion through titanium carbide. In order to understand the phenomena of Ti-C interaction at moderate temperatures, Ti-coated carbon disks prepared by PVD were heat treated under vacuum at temperatures in the range of 400-750 o C, and analysed mainly by RBS. At low temperatures and for short isothermal exposure, the formation of a titanium carbide interphase is discontinuous and controlled by the diffusivity of C in Ti. As soon as a continuous titanium carbide layer is formed between C and Ti, the interaction is controlled by the kinetics of diffusion of C in titanium carbide.