Effect of Ca addition on microstructure and properties of porous Mg-1Zn-1Sn alloy scaffold prepared via 3D printed Ti template-infiltration casting
(1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. National Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, Tianjin 300384, China;
3. Key Laboratory of Display Materials and Photoelectric Device (Ministry of Education), Tianjin University of Technology, Tianjin 300384, China)
2. National Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, Tianjin 300384, China;
3. Key Laboratory of Display Materials and Photoelectric Device (Ministry of Education), Tianjin University of Technology, Tianjin 300384, China)
Abstract: The Mg-1Zn-1Sn and Mg-1Zn-1Sn-0.2Ca alloy scaffolds were prepared via infiltration casting using 3D-printed Ti templates to achieve complete and accurate control of the pore structure. The results indicate that the actual porosity and pore size of the prepared P model for each pore size are greater than the designed values. The addition of Ca changes the second phase of the alloy from Mg2Sn to CaMgSn and refines its microstructure. The compressive yield strength and compressive modulus of the Mg-1Zn-1Sn-0.2Ca alloy scaffold reach 32.61 MPa and 0.23 GPa, respectively. The corrosion current density is measured at 14.64 μA/cm2, with an instantaneous corrosion rate of 0.335 mm/a. Both scaffolds exhibit excellent biocompatibility and no cytotoxicity. Additionally, the antibacterial effects of both alloys on E. coli are greater than 97.81%. These results indicate that Mg alloy scaffolds have great potential for clinical applications.
Key words: infiltration casting; 3D-printed Ti template; mechanical properties; corrosion resistance; biocompatibility