Abstract
In order to improve the high-temperature tribological properties, the composite lubricating coating with unique structure and properties was designed based on the solid-liquid composite lubrication just as liquid water serves as the lubricant when you skating on ice. In this work, the synthetic sulfur-polyhedral oligomeric silsesquioxane (S8-POSS) were introduced into the polyamide-imide/polytetrafluoroethylene (PAI/PTFE) lubricating coating and their wear resistance at different temperatures were investigated. As a result, the friction coefficient decreased obviously as the temperature rises, but the wear rates trend to rise. Importantly, compared with PAI/PTFE coating, the friction coefficients and wear rates at high temperatures significantly reduced with the increase of the amount of S8-POSS. It can be concluded that high temperature result in S8 melting and gathering in the wear tracks during the friction process, forming solid-liquid composite lubrication, which significantly reduces the friction coefficient. Moreover, the presence of POSS improves the load-bearing capacity of the coating, which finally imparts the composite coatings with outstanding tribological properties under high temperature.
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