Structural characterization and electrochemical behavior of a laser-sintered porous Ti–10Mo alloy

Metallic materials for medical use

“…Further reduction of the elastic modulus while maintaining acceptable strength characteristics clearly should be associated with the switchover to the use of porous (mesh, foam-like) product structures obtained by powder metallurgy methods [21,22] or layer-bylayer laser melting / selective laser melting ("3D printing") [23] instead of solid materials. Porous titanium and its alloys ensure the flow of body fluids and bone tissue ingrowth at a pore size of 200-500 μm [24], whereas a reduction in size to 100 μm makes osteoblast ingrowth impossible [25].…”

“…Some of the most recently used are partial (loose) sintering of metal powders [28], space holder method [20], spark plasma sintering (porous Ti with yield strength 27.2-94.2 MPa and elastic modulus 6.2-36.1 GPa was derived in [29]), microwave sintering (Ti-6Al-4V/multiwall carbon nanotubes composite with porosity of approximately 25%, yield strength of 145.48 ± 27.28 MPa and elastic modulus of 10.87 ± 2.46 GPa obtained in [30]), combustion synthesis [31], selective laser melting (porous Ti-10Mo alloy with compressive yield strength of 95.59 MPa and an elastic modulus of 4.89 GPa was created in [23]). "3D printing" techniques seems to be most promising among them, since they allow the formation of desired porous structure along with exact implant shape according to the CAD model based on tomography data.…”

Electrochemical behavior of biocompatible alloys

“…Recently, the development of b titanium alloys has drawn considerable attention in the biomedical area for their much lower Young's modulus compared to the a (105 GPa for pure Ti) 4 or (a + b) Ti alloys (110 GPa for Ti6Al4V) 4 , thus exhibiting a better biomechanical compatibility. A large modulus mismatch between a metallic implant and the adjacent bone (the Young's modulus of the human bone is 10-30 GPa) will cause the stress-shielding effect, leading to an excessive bone resorption and implant loosening 4 .…”

“…A large modulus mismatch between a metallic implant and the adjacent bone (the Young's modulus of the human bone is 10-30 GPa) will cause the stress-shielding effect, leading to an excessive bone resorption and implant loosening 4 .…”

Analysis of tribocorrosion behavior of biomedical powder metallurgy titanium alloys

“…Indeed, the study of the electrochemical properties of a selective laser sintered porous Ti-10Mo in a naturally aerated 0.9 wt % NaCl solution at 37°C showed the decrease of porosity caused the corrosion potential to move towards positive direction, the corrosion current density reduced and the passivation range broadened, indicating an improvement in corrosion resistance [72]. Fojt et al [73] studied the corrosion behaviour of porous Ti39Nb alloy processed by powder metallurgy and reported that up to15 % of porosity samples exhibited similar corrosion behaviour to the dense samples, however, localized corrosion was observed above this porosity value.…”