Sinter-based Additive Manufacturing of bio-degradable metallic orthopedic implants
MATEIS Lab, INSA Lyon
In this PhD thesis, we will focus on sintering-assisted 3D printing techniques of magnesium. Either by direct-ink writing or metal lithography, two techniques available in our lab, the main challenge remains the optimization of debinding/sintering processes, as magnesium is one of the most reactive metal for oxidation issue. The PhD student will put his/her efforts on:
1) the production of dense parts using pressure-assisted sintering that will be used as references
2) the 3D printing of either porous or complex-shaped structures. This will be done by:
- direct-ink writing, which is a 3D extrusion process followed by debinding/sintering ;
- metal lithography, which is based on the curing of a photo-sensitive polymer to consolidate the metallic part, followed by debinding/sintering
3) the detailed characterisation of the parts, from the microstructure to the mechanical and the corrosion properties. The properties will depend on the precipitation-hardening strategy, which will be optimised.
4) As an alternative to magnesium alloy, a Zn alloy will be designed, produced and tested.