Novel modular ceramic building blocks / polymer composites based on a near net shape process: manufacturing, characterisation and applicationThursday (08.10.2020) 14:40 - 15:00
Modular composites with a 3D periodic structure, consisting of a brittle inorganic phase (building-blocks) and a viscoelastic organic matrix, offer great potentials for improved fracture toughness and failure probability. Ceramic building blocks were assembled by a placing system equipped for 3D periodic structures as cubic, monoclinic and triclinic unit cells in a near-net-shape approach. Afterwards infiltration with a epoxy resin to fabricate epoxy-alumina composites follows. The brick-and-mortar like building block exhibited improved bending strength, fracture toughness and failure probability compared to monolithic epoxy. Based on these basic structures modular ceramic arteriovenous loops (AV-loops) with a hierarchical porosity approach were designed to ensure rapid vascularization for bone ingrowth. Bioactive building blocks with dimensions of 1.5 – 3.0 mm were assembled to complex AV-loop scaffolds using a biocompatible adhesive. The modular AV-loop scaffolds provide a hierarchical interconnected pore network (P = 58.8 %) for optimum vascularization and complete bone ingrowth. The modular building block approach allows to design patient individualized scaffolds with complex hierarchical pore networks where volume, size and can be tuned by changing the dimensions, shape and placing gap of the bioactive building blocks.