Porous Titanium Scaffolds for Biomedical Applications: Corrosion Resistance and Structure Investigation

2011 ◽  
Vol 674 ◽  
pp. 41-46 ◽  
Author(s):  
Bogdan Dabrowski ◽  
Janusz Kaminski ◽  
Wojciech Swieszkowski ◽  
Krzysztof J. Kurzydlowski
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Biomedical Application ◽  
Total Porosity ◽  
Porous Titanium ◽  
Porous Metals ◽  
Porous Ti ◽  
A Cell ◽  
Good Biocompatibility

Due to its suitable physical properties and good biocompatibility, the titanium (Ti) can be used for development of porous structures for biomedical applications. The state of art in the field of corrosion resistance showed problems with corrosion analysis of porous metals. Therefore, it is essential to understand the influence of porosity of metals on corrosion parameters. The aim of this study was to investigate the corrosion resistance of highly porous titanium scaffolds for biomedical application. The Ti scaffolds were fabricated by powder metallurgy technique. The total porosity of the scaffolds ranged from 45 to 75%. The cast Ti sample was also tested for comparison. The electrochemical behavior of the Ti samples was monitored by electrochemical impedance spectroscopy (EIS) and potentiodynamic method at the room temperature. All electrochemical experiments were performed by a three-electrode technique in a cell containing a 0.9% NaCl electrolyte solution. With use of AAF, the active area of porous Ti was estimated. The porous Ti with porosity of 75% shows a better resistance to corrosion than the other porous Ti scaffolds. However, the corrosion resistance of Ti scaffolds was lower than cast Ti.

Corrosion Resistance Evaluation of Porous Titanium with Biomimetic Coatings

2008 ◽  
Vol 591-593 ◽  
pp. 55-60 ◽  
Author(s):  
E.P. Banczek ◽  
S.L. de Assis ◽  
Marize Varella de Oliveira ◽  
Waléria Silva de Medeiros ◽  
Luiz Carlos Pereira ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Body Fluid ◽  
Electrochemical Impedance ◽  
Surface Film ◽  
Phosphate Buffer Solution ◽  
Porous Titanium ◽  
Buffer Solution ◽  
Porous Ti ◽  
Potentiodynamic Polarisation ◽  
Sbf Solution

In this work, porous titanium samples processed by powder metallurgy and coated with biomimetic coatings, obtained during different periods of immersion in a simulated body fluid (SBF), were tested for corrosion resistance in a phosphate buffer solution (PBS). Uncoated samples were also tested for comparison. The corrosion resistance of both types of titanium samples was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarisation curves. The electrochemical results indicated the formation of a surface film on the porous Ti samples with immersion in the SBF solution and this biomimetic film increased their corrosion resistance. This film helps osteointegration besides increasing corrosion resistance.

scholarly journals Titanium Scaffolds by Direct Ink Writing: Fabrication and Functionalization to Guide Osteoblast Behavior

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1156
Author(s):  
Elia Vidal ◽  
Diego Torres ◽  
Jordi Guillem-Marti ◽  
Giuseppe Scionti ◽  
José María Manero ◽  
...  
Keyword(s):  
Stress Shielding ◽  
Total Porosity ◽  
Porous Titanium ◽  
Shielding Effect ◽  
Sintering Process ◽  
Thermosensitive Hydrogel ◽  
Recombinant Fragment ◽  
Direct Ink Writing ◽  
A Cell ◽  
Good Biocompatibility

Titanium (Ti) and Ti alloys have been used for decades for bone prostheses due to its mechanical reliability and good biocompatibility. However, the high stiffness of Ti implants and the lack of bioactivity are pending issues that should be improved to minimize implant failure. The stress shielding effect, a result of the stiffness mismatch between titanium and bone, can be reduced by introducing a tailored structural porosity in the implant. In this work, porous titanium structures were produced by direct ink writing (DIW), using a new Ti ink formulation containing a thermosensitive hydrogel. A thermal treatment was optimized to ensure the complete elimination of the binder before the sintering process, in order to avoid contamination of the titanium structures. The samples were sintered in argon atmosphere at 1200 °C, 1300 °C or 1400 °C, resulting in total porosities ranging between 72.3% and 77.7%. A correlation was found between the total porosity and the elastic modulus of the scaffolds. The stiffness and yield strength were similar to those of cancellous bone. The functionalization of the scaffold surface with a cell adhesion fibronectin recombinant fragment resulted in enhanced adhesion and spreading of osteoblastic-like cells, together with increased alkaline phosphatase expression and mineralization.

Corrosion Behavior of Porous Ti-24Nb-4Zr Alloy in Different Simulated Body Fluids

2011 ◽  
Vol 399-401 ◽  
pp. 1577-1581
Author(s):  
Yu Xuan Li ◽  
Zhen Duo Cui ◽  
Xian Jin Yang ◽  
Sheng Li Zhu
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Ph Values ◽  
Porous Ti ◽  
Ti Alloys ◽  
Excellent Corrosion Resistance ◽  
Conventional Sintering

Porous Ti alloys are novel biomedical candidates for surgical implant application. The corrosion resistance of porous Ti-24Nb-4Zr alloy with 41.54% porosity prepared from conventional sintering was investigated by means of open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 0.9% NaCl physiological and Hank’s solutions with different pH values (2.4, 5.4, 7.4) at 310 K, respectively. Meaning solid Ti-24Nb-4Zr alloy was chosen as a reference. Porous Ti-24Nb-4Zr alloy shows wide passive regions based on anodic polarization curves. These observations suggest that porous Ti-24Nb-4Zr alloy owns excellent corrosion resistance. Therefore, they are potential for biomedical applications.

Porous Ti-6Al-4V Alloy Prepared by a Press-and-Sinter Process

2012 ◽  
Vol 520 ◽  
pp. 76-81 ◽  
Author(s):  
Hai Lian Bi ◽  
Chang Zhou Yu ◽  
Peng Cao ◽  
Yue Hui He
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Sinter Process ◽  
Porous Titanium ◽  
Nominal Composition ◽  
Alloyed Powder ◽  
Blended Elemental ◽  
Young’S Moduli ◽  
Porous Ti ◽  
Powder Sintering

This paper reports the synthesis of porous titanium with a nominal composition of Ti-6 wt%Al-4wt%V through a press-and-sinter process. Blended elemental (BE) mixtures of Ti and master alloy Al-40V powders were uniaxially pressed and sintered in vacuum. Porosity of the sintered samples was determined in the range of 23vol. % to 37vol. % by the Archimedes method. Tensile strengths were found to range from 73 to 147MPa and Young’s moduli of the sintered samples varied from 3.4GPa to 13GPa. Both tensile strength and elastic modulus decreased with increasing porosity. Electrochemical assessment of the sintered porous samples showed deteriorated corrosion resistance, as compared to 95% dense Ti-6Al-4V prepared by sintering pre-alloyed powder. The challenge of using blended elemental powder sintering to fabricate porous Ti-6Al-4V alloys is discussed.

Corrosion Resistance of Nitric Acid Passivated Cr-Ni-Mo Stainless Steel

2016 ◽  
Vol 858 ◽  
pp. 196-201
Author(s):  
Viera Zatkalíková ◽  
Lenka Markovičová
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Nitric Acid ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Austenitic Stainless Steels ◽  
Mass Losses ◽  
Excellent Corrosion Resistance ◽  
Acidic Chloride Solution ◽  
Acidic Chloride

Austenitic stainless steels are considered materials with excellent corrosion resistance, and with acceptable mechanical properties. Therefore they are recommended for various constructional, industrial and biomedical applications. However they are prone to the pitting corrosion in aggressive chloride environments. The aim of this study is to evaluate the corrosion resistance of AISI 316Ti stainless steel with nitric acid passivated surface at the temperature range 22 – 80 °C in 1M acidic chloride solution. Evaluation of the corrosion resistance is based on the results of exposition immersion tests (visual and microscopic observation of attacked surfaces, mass losses of specimens) and the results of the electrochemical impedance spectroscopy (EIS) tests.

The Effect of Mo and Al on the Corrosion Behavior of Titanium and Some of its Alloys for Biomedical Applications

2014 ◽  
Vol 216 ◽  
pp. 11-16
Author(s):  
Julia Mirza Rosca ◽  
Liana Sanda Baltes ◽  
Mircea Horia Tierean
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Stable State ◽  
Experimental Conditions ◽  
Biomedical Implant ◽  
Β Phase ◽  
Impedance Spectroscopy Technique ◽  
Implant Alloys ◽  
Made In

The influence of molybdenum and aluminum on the corrosion resistance of the Ti and other Ti-based biomedical implant alloys under simulated physiological conditions is presented. Ti and its alloys Ti-10Mo and Ti-10Mo-10Al were studied. The electrochemical impedance spectroscopy technique was used and the experimental results were compared with those obtained by potentiostatic and potentiodynamic techniques. All the measurements were made in Ringer ́s solution at different pH and at different potentials as Ecorr, -650, -500, 0, +200 and +400 mV vs SCE. It was evident that Mo improved passivity and limited the active corrosion of the β-phase of Ti while Al enrichment of the α-phase was found to be detrimental to the passivity and corrosion resistance of Ti. In most experimental conditions, the passive film is formed by TiO2, Ti2O3and TiO. When pH is very low, thermodynamically stable state of Ti is titanium anion Ti3+.

scholarly journals In vitro and in vivo evaluations of mechanical properties, biocompatibility and osteogenic ability of sintered porous titanium alloy implant

RSC Advances ◽  
2018 ◽  
Vol 8 (64) ◽  
pp. 36512-36520 ◽  
Author(s):  
Ji Li ◽  
Zhongli Li ◽  
Ruiling Li ◽  
Yueyi Shi ◽  
Haoran Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Bone Ingrowth ◽  
Porous Titanium ◽  
Porous Ti ◽  
Good Biocompatibility

The sintered porous Ti6Al4V with 75% porosity has optimal mechanical properties, good biocompatibility and osteogenic ability for more bone ingrowth.

Evaluation and regulation of the corrosion resistance of macroporous titanium scaffolds with bioactive surface films for biomedical applications

2019 ◽  
Vol 7 (21) ◽  
pp. 3455-3467 ◽  
Author(s):  
Xingyu Zhou ◽  
Xi Fu ◽  
Hongjie Chen ◽  
Zhanwen Xiao ◽  
Li Min ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Porous Titanium ◽  
Electrochemical Analysis ◽  
Surface Films ◽  
Bioactive Film

A three-layer bioactive film on porous titanium was constructed and evaluated for its corrosion resistance via electrochemical analysis.

Characterization of Porous Ti-35Nb Alloy Sintered at Different Temperatures for Implant Applications

2014 ◽  
Vol 802 ◽  
pp. 496-500 ◽  
Author(s):  
Cristyane Silva Santos de Oliveira ◽  
Alexandre Antunes Ribeiro ◽  
Alexandre Antunes Ribeiro ◽  
Roseli Marins Balestra ◽  
Sandro Griza ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
Total Porosity ◽  
Processing Parameters ◽  
Porous Titanium ◽  
Pore Former ◽  
X Ray ◽  
Porous Ti ◽  
Different Temperatures ◽  
Bone Tissue Formation

Studies show that porous titanium alloys improve osseointegration at the implant-bone interface, since they induce new bone tissue formation inside the pores providing a better mechanical stability. In this work, porous Ti-35Nb samples were manufactured by powder metallurgy for orthopedic implant application. The titanium and niobium powders were mixing with a pore former additive and then uniaxially and cold-isostatically compacted. The samples sintering were performed at 1200oC and 1300oC. Samples characterization was performed by Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM/EDS), X-Ray Diffractometry (XRD) and Optical Microscopy (OM). Moreover, ultrasound test and Quantitative Analysis by Optical Metallography (QAOM) were conducted to obtain the modulus of elasticity and total porosity, respectively. The results indicated that the used processing parameters made it possible to obtain homogeneous microstructures throughout the length of the sample.

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