Study on Friction Reduction and Wear Resistance of Ultra High Molecular Weight Polyethylene Composites Filled with Fluorinated Graphite Under Water Lubrication Conditions
The study prepared high-performance ultra-high molecular weight polyethylene/graphite fluoride(PE-UHMW/GrF)composites using ball milling and hot pressing techniques.The wettability,mechanical properties,and tribological performance of composites in a water-lubricated environment were studied by a contact angle measurement equipment,a tensile testing machine and a friction-wear testing machine,respectively.The results showed that the addition of graphite fluoride(GrF)significantly reduced the hydrophilicity of the composites.Adding a small amount of GrF significantly improved the mechanical properties of the composites.When the mass fraction of GrF reached 1.0%,the elastic modulus,yield strength,and tensile strength of the composites increased by 39.13%,15.19%and 6.60%compared to PE-UHMW.In the water-lubricated environment,GrF reduced both the friction coefficient and wear rate of the ultra-high molecular weight polyethylene(PE-UHMW)matrix.With a 0.5%mass fraction of GrF,the friction coefficient of the composite dropped to a minimum value of 0.023 3.GrF enhanced the wear resistance of the PE-UHMW composites,with the wear mechanism primarily being fatigue wear.With the GrF content increased,the fatigue wear resistance of the composites progressively improved.
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