[T1] Powder Production

[15C-T1-10] Fabrication and Characterization of Biodegradable β-TCP/Zn-Ag-Based Composites via AgNWs-Assisted Hetero-Agglomeration and SPS-Induced In Situ Alloying

*X. Sun¹, X. Wang², W. Li¹, D. Liu¹ (1.Tianjin University of Technology, China, 2.Tohoku University, Japan)

キーワード：Biodegradable Zn-based composite, Silver nanowires, Hetero-agglomeration, In situ alloying, Degradation behavior

In current study, the homogeneous dispersion of beta-tricalcium phosphate (b-TCP) reinforcement into Zn matrix was achieved via a novel ternary hetero-agglomeration process, using AgNWs as a bridging agent. On account of spark plasma sintering (SPS)-induced in situ alloying between Ag and Zn, the intimate interfacial bonding between b-TCP reinforcement and AgZn₃ secondary phase was acquired. As a result, 1β-TCP/Zn-Ag composites exhibited a yield strength (YS) of 235.8 ± 1.2 MPa, an ultimate tensile strength (UTS) of 271.3 ± 4.0 MPa, and an elongation at failure of 22.8 ± 1.5%, due to the fine and uniform microstructure and enhanced interfacial strength. The 50% extracts of the β-TCP/Zn-Ag components resulted in over 90% cell viability of MC3T3-E1 pre-osteoblast. Moreover, good antibacterial effect against S. aureus and E. coli cells was verified in the β-TCP/Zn-Ag composites. Consequently, the biodegradable 1β-TCP/Zn-Ag composite manufactured by AgNWs-assisted hetero-agglomeration method and subsequent SPS and HE processes could be used as a desirable orthopedic implantation material.