Abstract
High-quality porous Mg alloy scaffolds show promise in repairing large segmental bone defects. In this study, the authors prepared porous ZK60 scaffolds using the selective laser melting (SLM) method with three different model structures: Gyroid (G), Diamond (D), and Dodecahedral (Do). The researchers investigated the structural refinement, mechanical properties, and corrosive properties of SLM-ed ZK60 by adjusting the 3D printing parameters, specifically the scanning speed and laser power. The results show that, with optimized process parameters of a scanning speed of 400 mm/s and a laser power of 110 W, the relative density of the prepared samples was higher than 97 %. After post-processing with electrolytic polishing, the G model scaffolds showed a smooth structural transition and the largest surface area compared to the other two models. The electrolytic polishing treatment also improved the structural refinement of the 70 % designed porosity, with an error of only 4.3 %. Additionally, the Do model scaffolds exhibited the best mechanical properties, with a yield strength of up to 24 MPa and an elastic modulus of up to 425 MPa. Furthermore, after coating treatment, the corrosion rate decreased from 5.67 mm/year to 1.34 mm/year after 48 h. These results demonstrate the potential of SLM-ed porous scaffolds for biomedical applications.
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