Development and tribological behaviour of UHMWPE filled epoxy gradient composites

In this study, ultra high molecular weight polyethylene (UHMWPE) filled epoxy gradient composites have been developed. Samples were prepared for different centrifugation time periods. SEM and optical microstructures confirmed the graded dispersion of UHMWPE particles in the epoxy matrix. Quick estimation of gradient characteristics has been done by abrasive wear measurements. Sliding wear tests were conducted by using a pin-on-disc machine. The sliding wear rate of composites reduced on increasing centrifugation time. Reduction in sliding wear rate in UHMWPE filled epoxy gradient composites has been attributed to the reduction of tensile contact stresses as a result of the lubricating effect of UHMWPE's smooth surface and highly entangled chain structure of UHMWPE.