Study On Anti-Friction Application Of Bionic Surface Textures On Modified Uhmwpe Water-Lubricated Bearing

Nowadays,water-lubricated bearings have become a good choice to replace traditional oil-lubricated bearings in the fields of marine engineering and machinery to protect the environment under the background of eco-friendly development,and the research on its bearing bush material has also become a hot spot.Among them,ultra-high-molecular-weight polyethylene(UHMWPE),as a new water-lubricated bearing bush material,has been favored by many researchers because of its excellent friction and wear performance.In order to obtain better tribological properties,the anti-friction application of bionic surface textures on modified UHMWPE water-lubricated bearing was investigated in this paper.Firstly,finite element analysis of tribological properties of bionic water-lubricated bearings with Nepenthes Alata structures was carried out and a new type of bionic water-lubricated bearing was designed.There were Nepenthes Alata structures on its bearing bush,which were mainly two types: crescent textures on the surface of slippery zones and ridged textures on that of the peristome.The flow field analysis was carried out by ANSYS Fluent used the simplified lubricating film model of the bearing.By the variation of rotational speeds,loads and surface textures of different shapes and sizes,the optimization of the anti-friction performance and the bearing capacity of the water film were explored and the mechanism was analyzed.What’s more,the optimization of hydrophilicity and tribological properties of halogenated UHMWPE were studied.Three groups of UHMWPE with optimum hydrophilicity were obtained by halogenation modification.The mechanism of hydrophilicity enhancement by halogenation modification was investigated by combining surface morphologies and energy spectrum analysis.Friction and wear tests were carried out on block-on-ring wear tester to measure the friction coefficients of modified UHMWPE under different test conditions,as well as the wear volume and the morphologies of worn surfaces were studied to explore the friction and wear mechanism.The synergistic optimization effect of the improvement of hydrophilicity on tribological properties was explained by the lubrication mechanism,as well as the influence of the change of interface properties on wear mechanism.Besides,tribological properties of UHMWPE with bionic textures on the surface of slippery zones of Nepenthes Alata were studied.Different surface textures of UHMWPE were processed by nanosecond laser and the wettability of UHMWPE with textures was tested.Friction and wear tests were carried out measure the friction coefficients of one group of UHMWPE without textures and three groups of UHMWPE with surface textures under different test conditions,as well as the wear volume and the morphologies of worn surfaces were studied to explore the friction and wear mechanism.The mechanism of the influence of bionic surface textures on the tribological properties of UHMWPE was summarized.Last but not least,tribological properties of halogenated UHMWPE with bionic textures on the surface of the peristome of Nepenthes Alata were studied.UHMWPE were processed by nanosecond laser and halogenated,and the wettability of UHMWPE before and after the processing and modification was tested.The comprehensive effect on hydrophilicity by surface textures and halogenation modification was investigated by combining surface morphologies and energy spectrum analysis.Friction and wear tests were carried out measure the friction coefficients of six groups of UHMWPE before and after the processing and modification under different test conditions,as well as the wear volume and the morphologies of worn surfaces were studied to explore the friction and wear mechanism.The mechanism of the influence of bionic surface textures and halogenation modification on the tribological properties of UHMWPE was summarized.