Polymer components are widely used in orthopedic applications, for example, as articulating inserts in total joint replacements. Advanced manufacturing technologies are constantly introduced to improve properties and add functionality of these components.
In the first part of the talk, we describe how micro computed tomography (micro-CT) is used to better understand and improve equal channel angular extrusion (ECAE) process which increases molecular entanglement of ultra high molecular weight polyethylene (UHMWPE). Additively manufactured acrylonitrile butadiene styrene (ABS) grids are inserted in the billet before the extrusion. Their shape and location after the ECAE is investigated with micro-CT to provide an insight on the distribution of the strain due to the extrusion.
In the second part of the talk, the micro-CT is utilized to characterize microstructures of UHMWPE specimens loaded with conductive carbon nanoparticles, nano-graphene or carbon black. Uniformity of distribution and the weight fraction of the particles in the composite are correlated with the changes in its mechanical properties and improvement of electrical conductivity.
