Study on surface modification of medical implant titanium alloy by laser interference

• 1、International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology

Abstract：In this paper, silver was used as antibacterial agent，the periodic micro nano structure was fabricated on the surface of titanium alloy by laser-induced interference, and silver was fused with titanium alloy at the same time. It is expected to obtain titanium alloy functional surface with good antibacterial properties and friction reduction. The physical and biological properties of six groups of samples with different silver film thickness of 0-500nm, Ag50nm, Ag100nm, Ag200nm, Ag300nm, Ag400nm and Ag500nm were tested. The results show that the friction coefficient of the modified sample decreases by 60% at most. All the samples showed good antibacterial activity against S.aureus, which increased with the increase of silver film thickness. Ag50nm, Ag100nm, Ag200nm, Ag300nm samples had no cytotoxicity, Ag400nm samples had slight cytotoxicity, and Ag500nm samples had greater cytotoxicity, so Ag300nm samples were most suitable for human implantation materials.

Keywords： Ti6Al4V alloy Laser interference Periodic micro nano structure Silver doping Antibacterial