Abstract
Water lubrication has some advantages, such as clean, safe and low friction, compared to oil lubrication. In particular, self-mated silicon carbide (SiC) in water gives low friction (1<0.01) . However, the problem for water lubrication is its low load-carrying capacity. Therefore, it is essential to increase the critical load (Wk) so that water lubrication system can be put into practical use. This study shows the effectiveness of running-in method in increasing the critical load of self-mated silicon carbide in water. After running-in process, it is found that the critical load increases with the increase in the surface free energy. Furthermore, a resonant shear measurement is conducted in order to investigate the shear behavior of nanometer-scale water confined between the SiC surfaces. Based on this measurement, it is clarified that the water is held more strongly between the SiC surfaces which had the higher the surface free energy. As a result, this prevents the direct contact between the surfaces. The surface free energy is one of the most important key factors for increasing the load-carrying capacity of silicon carbide in water lubrication system.
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