DEVELOPMENT OF POROUS TITANIUM AND ITS BIO ACTIVITY STUDIES

Abstract

Titanium is best known for it's excellent corrosion resistance, high strength to weight ratio, good mechanical properties and bioconipatibility. In the world today orthopedic prosthesis has resulted in a big success in restoring the function as well as quality of life to million of individuals. Therefore it is very essential for an engineer to design and develop a new approach to restore the normal function of impaired hard tissue. In the present study production of porous titanium using the space holder technique was taken into account. The development of porous titanium was done through powder metallurgy route. The production processes of porous titanium using ammonium-bi- carbonate (NH4IICO3) as porosity agent (Pt) with different percentage of composition has been investigated. The raw material as pure titanium (99.8% purity) having size 325 mesh was obtained from Alfa Aesar. Processing. Characterization, and Mechanical Properties such as Compression Behavior and result of Optical Microscope (OM). Scanning Electron Microscopy (SEM), X-Ray Diffraction. Energy Dispersive X-Ray Analysis (EDAX) is presented for the porous 't'itanium. Three types of 4 cold compaction pressures were employed in this study such as 50 MPa. 100 MPa and 150 MPa. It was found that porous titanium exhibited porosities ranging in-between 30-68% with density ranges from 1.4 to 3.2 gmfcm3. Porous structure was determined afler removal of ammonium bicarbonate through decomoposition process. The sintering process spacer material therefore depends on the melting point of porosity agent, hence sintcring process was carried out in two stages such as at decomposition (270°C) and sintering (9501C). Optical microscopic results shows good interconnected pore structure at I OOMPa this is the reason why further study is conducted on I OOMPa pressure level. Further the surface modification is achieved through Sodium Hydroxide Chemical 'I'reatment and Hydrogen Peroxide chemical treatments. These both chemically treated pellets were Further treated with Silver Nitrate solution. The Characterization results X-Ray Diffraction (XRD). Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX), Fourier Transform Infrared Spectroscopy (FI'IR) and Ranian Spectroscopy) showed that Hydroxide Titanate layer and Sodium 'l'itanatc Layer were successfully formed on Porous Titanium surface. Further thcse samples were treated by Silver Nitrate solution and showed successfully incorporation of 'Ag' particles on titanium surface. Antibacterial studies on these silver incorporated samples showed inhibition to bacteria like as Staphylococcus Aureus. Further Simulative Body Study (SBF) successfully showed the formation of Apatite Layer on Titanium surface.