MIRCEA CORBAN, IOAN ROMAN, ROXANA TRUSCA, ANCA DINISCHIOTU, IRINA CARCEANU, NECULAI STAN, CORNEL FRATILA ASPECTS REGARDING ALLOYING EFFECT ON ELECTROCHEMICAL STABILITY OF THE SINTERED TITANIUM
The titanium alloys Ti6Al4V, Ti5Al2.5Fe and Ti6Al7Nb sintered in high vacuum, about 10-3 Pa, at 1300oC, of element powders with 200mm grain size presents spontaneous passivation in Ringer solution and submicron corrosion rate, higher electrochemical stability properties than sintered pure titanium. Titanium alloying improves the sintering quality, achieving thus a reduction of the material porosity by 10 ÷ 20% and a corresponding increase in mechanical strength. The porosity and the large specific surface area, of about 0.4m2/g, promote cell growth and bone anchoring at the interface. The Ti6Al7Nb sintered titanium alloy was identified as the most valuable candidate for the medical implants manufacturing, based on its best passivation and hFOB cells citocompatibility properties.