Abstract
The relationship between energy loss in the friction process and tribological performance is not clear. It is of great significance to use molecular dynamics simulation to investigate the mechanism of energy transfer behavior during friction on tribological performance from a microscopic point of view. In order to investigate the microscopic friction behavior of carbon nanotube/epoxy composite coatings, sliding friction models were established by molecular dynamics simulation technique at temperatures of 288 K, 298 K and 308 K, respectively. The influence law of temperature on the interfacial interaction of carbon nanotubes and epoxy was analyzed, and the mechanism of the coating energy transfer behavior on its tribological properties was investigated. The results show that the coefficient of friction of the coating increases with increasing temperature, with the lowest average coefficient of friction of 0.264 at an operating temperature of 288 K and the highest average coefficient of friction of 0.281 at an operating temperature of 308 K. The wear rate of the coating is influenced by both the energy storage capacity and the heat dissipation capacity, with a minimum wear rate of 16.2 % at a temperature of 298 K. It has been shown that when the temperature increases, the atomic motion within the composite coating is intense and the probability of energy being transferred or exported in the form of molecules and atoms colliding with each other increases. Therefore, when the ambient temperature increases, the coating’s ability to dissipate heat increases while its ability to store energy decreases. The coefficient of friction of the coating is positively correlated with the energy storage capacity, i.e., the mechanical properties. The wear rate of a coating is influenced by both energy storage capacity and heat dissipation capacity. Therefore, the best overall tribological performance of the coatings is achieved at an ambient temperature of 298 K.
Published Version
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