Reserch On Tribological Properties Of PTFE Filled With Cu Composite In Both Dry And Seawater Environment

With the rapid development of the current science and technology, new polymer-based composites are emerging in an endless stream and they are widely in the fields of ocean shipping, aerospace and other fields due to their unique and excellent performance. Nano-materials are widely used as a polymer filler to improve the tribological properties of polymer based composites because of its unique properties. In recent years, the research on the tribological properties of polymer based composites has become a hot research topic in the tribological field of polymer materials. At present, friction pair of the traditional metal materials in marine engineering equipment is gradually realizing "substituting plastic for steel" and the tribological properties of polymer filled with nano-materials in seawater environment are rarely studied. Therefore, it has important practical significance to carry out research on the tribological properties of the composites in seawater lubrication conditions.In this article, the mechanical and tribological properties of Cu nanoparticles filled polytetrafluoroethylene(PTFE) in dry friction and water lubrication environment. Firstly, the mechanics and tribology effect of the filling content of Cu in two environments is studied, then the surface of the worn surface of the composites and dual transfer membrane were observed with the aid of scanning electron microscopy(SEM), by comparing the comprehensive performance to select the optimal ratio of composite materials in two environment. Then, on this basis, explore the tribological properties of selected best ratio composite materials under various operating conditions.The research results show that the tensile strength of the composite material decreased with the addition of nanometer Cu, but the rigidity increased in the two kinds of environment. As for the same filling content of Cu in composite, the tribological performance of composite materials in the environment of seawater lubrication is better than in dry friction environment. Comparatively speaking, the tribological performance of 30% filling content Cu in composite material is the best in dry friction and 20% filling content Cu in composite material is the best in seawater lubrication condition. The analysis showed the wear mechanism of the composite was mainly adhesive wear, fatigue wear and abrasive wear in the dry friction environment; while mainly adhesive wear, flaking and abrasive wear in seawater lubrication environment. In different working conditions of tribological experiment, 30% Cu content in the composite is suitable for low speed high load condition in dry friction environment, and 20% Cu content in the composite material is suitable for low speed low load condition in dry seawater lubrication environment.