PTFE COMPOSITES AND WATER LUBRICATION I. TRIBOGICAL CHARACTERISATION This paper presents experimental results on tribological behaviour of some composites with PTFE matrix under water lubrication. The experimental work pointed out particular processes taking place in the superficial layers of the tested composites. The results were plotted in order to underline the existence of an optimal regime for a system with given geometry, materials and lubrication conditions. The composites with PTFE matrix have an optimal composition as concerning the adding materials concentration that gives better tribologiocal behaviour, including low friction coefficient and wear. For instance the composites with PTFE matrix and glass fibber have this optimal concentration range of 10…30%. There are presented maps for these two tribological parameters in order to reveal the importance of the sliding regime parameters as normal force and the sliding speed. The tests also underline that water lubrication could be o solution for sliding bearing taking into account the interest of scientists for environment protection.
Keywords: tribological behaviour, composites , glass fibber, water lubrication