Effect of Silver Content on Microstructure and Mechanical Properties of Porous Titanium

Using antibacterial silver as the alloying element and ammonium bicarbonate as the pore-forming agent respectively,porous titanium-silver alloys（Ti-Ag alloys） with different silver contents were prepared by powder metallurgy method.The effects of silver content on microstructure and mechanical properties of the porous titanium were investigated by weighing,SEM-EDS,XRD and universal mechanical testing machine.The results show that the porosity of Ti-Ag alloy increases from 65. 18% to 68. 25% when adding 3% of silver,with both of the compressive strength and elastic modulus for porous Ti-Ag alloy increased.When the content of silver is further increased to 10%,the porosity of Ti-Ag alloy keeps at about 68%,and the compressive strength and elastic modulus change little.The addition of silver has no obvious effect on pore structure of the porous Ti-Ag alloy,and its phase composition is mainly α-Ti.Porous Ti-Ag alloy has good pore structure and mechanical properties,owning the potential as an antibacterial orthopedic implant material for cancellous bone defect repair.