Study On The Wear Mechanism Of Friction Pair Made Of Textured Metal And Polymer

Polymer materials have been widely used in various kinds of machinery system due to their excellent properties.However,the wear of polymer is still serious in the actual working conditions,which will cause the failure of components and the waste of materials.Surface texture technology has been proved to be an effective measure to improve the tribological properties,but the wear behavior of friction pairs made of textured steel and polymer materials has been less thoroughly investigated and is not well understood.This paper aims at the lack of research on the wear mechanism of friction pairs made of textured steel and polymer and studies the wear behavior and mechanism using wear surface morphology and wear debris analysis technology,as to improve the understanding of surface texture design rule.The lithography and micro-electrolytic machining technology were used to fabricate surface patterns with different parameters on the stainless steel.Three kinds of polymer materials with different elasticity modulus were selected as study objects.Wear tests were conducted under water lubrication with a universal friction and wear tester.The friction coefficients and wear rates were measured as the indexes to evaluate tribological performance.The influence of texture parameters on wear mechanism was studied based on the worn surface morphology and wear debris observation analysis.The main conclusions of this paper are as follows:1.The introduction of surface texture can cause the reduction as well as increase of wear.As for the chosen polymer materials on this paper,the lower area density of 10% and 20% decreased the wear rate and the wear reduction effect enhanced as the polymer Young’s modulus increases.The higher area density of 40% increased the wear rate in all conditions.2.For the un-textured friction pairs,polymer transfer can be observed on the worn surface,which shows typical characteristics of abrasive wear and adhesive wear,the wear debris morphology revealed flaky and smooth wear debris,which proved adhesive wear occurred.3.Choosing the appropriate texture parameters can reduce the material transfer phenomenon of large area and the w orn surface shows few er scratches compared to un-textured specimens.In this condition,the wear debris tended to be lumpy,which might be caused by the micro dimples’ effect of wear debris storage.4.The surface texture of higher area density can cause severe stress concentration around the edge of dimples,which caused serious material burn and transfer during the wear process.The worn surface morphology of polymer manifest as deep and wide grooves.The wear debris tended to be rod shaped or twisted,which revealed micro-cutting wear morphologies and proved that serious micro-cutting effects occurred in this condition.