The Influence of Sliding Speed on the Friction Behavior of Silica Surface

Studies have shown that the relative sliding speed of the silicon-based material surface has an effect on its friction behavior. In this study, the molecular dynamics method was used to simulate the sliding of the SiO₂ surface at different speeds. This is to explore the internal mechanism between SiO₂ surface friction behavior and the relative sliding speed. First of all, this study constructed a 3D model of the SiO₂ friction surface and simulated the sliding process under two different environments of absolute dryness and full wetness. Then, the sliding of the SiO₂ surface at different speeds in dry and wet environments is simulated and verified the rationality of the simulation through experiments. The final results show that the lattice distortion and tribochemical reactions that occur on the SiO₂ surface of the material have varying degrees of influence on the friction behavior of the material surface. In the dry environment, the coefficient of friction of the SiO₂ surface increases with the speed. On the contrary, in the humid environment, the SiO₂ surface decreases as the speed increases. The analysis results found that the speed has varying degrees of influence on the lattice distortion and tribochemical reaction of the SiO₂ surface. Eventually, this study quantifies the effect of speed on SiO₂ surface tribochemical reactions and lattice distortion in two different environments.