Work

Co-extrusion of highly loaded feedstocks for fabrication of stainless steel-bioceramic core-shell structures

Year: 2024

Type: article

Abstract: Co-extrusion of multi-materials structures shows technological challenges and opportunities. Filaments made of a metallic core and a ceramic shell are one example of how structural and functional features can be combined in a single component to provide a synergic effect. In this work, we focused on the fabrication of shell and core-shell scaffolds for potential applications as bone substitutes . Stainless steel 316L was selected for the core material, whilst in situ synthesized sphene (CaTiSiO 5 ) bioactive ceramic was selected as a shell. The combination of a ductile core and a bioactive ceramic, so as scaffolds made of empty struts may represent a new generation of bone substitutes with mechanical properties closer to the ones of natural bone so as with improved bioactivity . Therefore, formulated inks were co-extruded in one step using a customized printing set-up. Microstructural and mechanical properties were investigated on shell and core-shell filaments and 3D structures. Shell bioceramics scaffolds possessed high porosity and target compression strength values. The sintering environment at the core-shell interface caused severe 316L oxidation thus compromising the ductility of the metallic part, however compression strength increased of 53% compared to shell structures .

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.10.255

Authors: Lisa Biasetto, Vanessa Gastaldi, Hamada Elsayed

Institution: University of Padua

Language: English

Topic: Additive Manufacturing and 3D Printing Technologies

Subfield: Automotive Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,430

Funders: European Commission, Ministero dell’Istruzione, dell’Università e della Ricerca