3D Bioplotter Research Papers

Porous materials, including foams and lattice structures, are used in many applications such as biomedical implants, heat exchangers, catalysts, and batteries due to their light weight, high surface area and energy absorption properties. Lattice structures, specifically, are of great interest since their properties can be tailored by employing various design methodologies (e.g., topology optimization). On the other hand, Ni-based superalloys are used in many applications where high-temperature and oxidation/corrosion resistance are important such as in gas turbine components. The advantageous properties of these Ni-Cr-Al-based alloys with the geometry and tailored mechanical properties of lattice structures can be combined through a…

Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H2-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750°C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al2O3 surface layer. However, the resulting Al depletion within the struts…