Molecular dynamics(MD)simulations were used to study a sliding friction process between DLC films on various boundary conditions.The experimental results revealed that,in the absence of a lubricant,a transfer film between the DLC films was formed.In contrast,when the oil or water lubricants were added to lubricate between the DLC films,a boundary lubrication layer was found.The friction forces on the water and oil lubrication were almost the same,but the friction force in the absence of a lubricant was larger than those on the water and oil lubrication.The conclusions were in good agreement with the experiments.
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