[SIS7] Powder Design for Industrial Application

[16C-SIS7-04] A Novel in situ Wetting Method to Develop Biodegradable Ag+Fe₂O₃@GO/Zn Biocomposites with Ameliorated Interfacial Properties and Substantial Antibacterial Activity

*Y. Lin¹, Z. Li¹, X. Wang^1,2, D. Liu³, X. Sun⁴ (1.School of Materials Science and Engineering, Tianjin University of Technology, China, 2.Department of Materials Processing, Graduate School of Engineering, Tohoku University, Japan, 3.Tianjin Key Laboratory for Photoelectric Materials and Devices, China, 4.National Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, China)

Keywords:Biodegradable metals, Zn-based composite, In-situ wetting, In-situ alloying, Interface

Biodegradable Zn-based composites could enhance the mechanical properties and biocompatibility of pure Zn. However, the easily agglomerative reinforcement and the poor interfacial bonding affectted composite performance. To resolve these issues, we designed an innovative in situ wetting strategy using Ag and Fe2O3 modified graphene oxide as the reinforcement to strengthen interfacial bonding and improve biocompatibility. During the sintering, Fe2O3 induced an in-situ redox reaction with Zn matrix, simultaneously producing an in-situ ZnO interlayer and the elemental Fe. Due to the elevated temperature and stress in sintering, elemental Fe and Ag could further alloy with Zn matrix contributing to the precipitation of secondary phase and solid solution in matrix, thereby garnering ZnO/GO/Zn-Ag-Fe biocomposites through only one-step sintering process. Unique interfacial structure, enhanced mechanical properties were confirmed in the biocomposites. This work could provide an inspiring and creative approach for the interfacial design and biofunctionalization of advanced Zn matrix biocomposites.