Mechanical and Corrosion Behavior of New Generation Ti-45Nb Porous Alloys Implant Devices

Prashanth, Konda Gokuldoss; Zhuravleva, Ksenia; Okulov, Ilya; Calin, Mariana; Eckert, Jürgen; Gebert, A.

doi:10.3390/technologies4040033

Cited by 23 publications

(10 citation statements)

References 42 publications

(65 reference statements)

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“…Although the chemical stability of Ti-Nb alloys is high (because of their excellent passive layer behaviour [37]), an increase in pH, in acidification of the Ringer's solution from pH 7.5 to pH 0.5 resulted in negative corrosion potential shifts. The addition of NaCl further exacerbated the corrosion resistance [38][39][40][41][42].…”

Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

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The corrosion behaviour of new generation titanium alloys (β-type with low modulus) for medical implant applications is of paramount importance due to their possible detrimental effects in the human body such as release of toxic metal ions and corrosion products. In spite of remarkable advances in improving the mechanical properties and reducing the elastic modulus, limited studies have been done on the electrochemical corrosion behaviour of various types of low modulus titanium alloys including the effect of different beta-stabilizer alloying elements. This development should aim for a good balance between mechanical properties, design features, metallurgical aspects and, importantly, corrosion resistance. In this article, we review several significant factors that can influence the corrosion resistance of new-generation titanium alloys such as fabrication process, body electrolyte properties, mechanical treatments, alloying composition, surface passive layer, and constituent phases. The essential factors and their critical features are discussed. The impact of various amounts of α and β phases in the microstructure, their interactions, and their dissolution rates on the surface passive layer and bulk corrosion behaviour are reviewed and discussed in detail. In addition, the importance of different corrosion types for various medical implant applications is addressed in order to specify the significance of every corrosion phenomenon in medical implants.

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Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

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“…Titanium-based implants in orthopedic surgery are often directly fixed in the host bone by press fit [ 21 , 22 , 23 , 24 ] or screw fixation [ 13 , 24 ]. Thereby, the highly diverging elastic properties of the implant material, e.g., cp-Ti or Ti-6Al-4V [ 25 ] and cortical bone [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], promote stress-shielding effects along the implant–bone interphase [ 35 , 36 ]. As a consequence, the osseointegration of the implant, especially bone ingrowth, may be affected [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Some of the studies reported on in situ alloying of Ti and Nb with several content of niobium [ 57 , 59 ]. Prashanth et al [ 25 ] described the mechanical properties of a porous Ti-45Nb alloy manufactured by a classic sintering process and subsequent hot pressing. The aim of our present study was the mechanical and microstructural characterization as well as the determination of the printing parameters of the Ti-42Nb alloy that was applied in the SLM manufacturing process described for the first time.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of a Newly Additive Manufactured Implant Material Based on Ti-42Nb

et al. 2018

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The application of Ti-6Al-4V alloy or commercially pure titanium for additive manufacturing enables the fabrication of complex structural implants and patient-specific implant geometries. However, the difference in Young’s modulus of α + β-phase Ti alloys compared to the human bone promotes stress-shielding effects in the implant–bone interphase. The aim of the present study is the mechanical characterization of a new pre-alloyed β-phase Ti-42Nb alloy for application in additive manufacturing. The present investigation focuses on the mechanical properties of SLM-printed Ti-42Nb alloy in tensile and compression tests. In addition, the raw Ti-42Nb powder, the microstructure of the specimens prior to and after compression tests, as well as the fracture occurring in tensile tests are characterized by means of the SEM/EDX analysis. The Ti-42Nb raw powder exhibits a dendrite-like Ti-structure, which is melted layer-by-layer into a microstructure with a very homogeneous distribution of Nb and Ti during the SLM process. Tensile tests display Young’s modulus of 60.51 ± 3.92 GPa and an ultimate tensile strength of 683.17 ± 16.67 MPa, whereas, under a compressive load, a compressive strength of 1330.74 ± 53.45 MPa is observed. The combination of high mechanical strength and low elastic modulus makes Ti-42Nb an interesting material for orthopedic and dental implants. The spherical shape of the pre-alloyed material additionally allows for application in metal 3D printing, enabling the fabrication of patient-specific structural implants.

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“…The mechanical compatibility of an implant material usually requires specific values of strength, elastic modulus, tensile ductility as well as fatigue and wear properties [ 2 , 3 ]. The required mechanical properties can be achieved, for example, via alloy design [ 4 , 5 , 6 ], tailoring of complex microstructures [ 7 , 8 , 9 ], or synthesis of porous [ 10 , 11 ] and composite materials [ 12 , 13 ]. The biological compatibility of implant materials can be achieved through avoiding toxic elements and surface functionalization (e.g., surface coating or surface roughening) [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Functionalization of Biomedical Ti-6Al-7Nb Alloy by Liquid Metal Dealloying

et al. 2020

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Surface functionalization is an effective approach to change the surface properties of a material to achieve a specific goal such as improving the biocompatibility of the material. Here, the surface of the commercial biomedical Ti-6Al-7Nb alloy was functionalized through synthesizing of a porous surface layer by liquid metal dealloying (LMD). During LMD, the Ti-6Al-7Nb alloy is immersed in liquid magnesium (Mg) and both materials react with each other. Particularly, aluminum (Al) is selectively dissolved from the Ti-6Al-7Nb alloy into liquid Mg while titanium (Ti) and niobium (Nb) diffuse along the metal/liquid interface to form a porous structure. We demonstrate that the porous surface layer in the Ti-6Al-7Nb alloy can be successfully tailored by LMD. Furthermore, the concentration of harmful Al in this porous layer is reduced by about 48% (from 5.62 ± 0.11 wt.% to 2.95 ± 0.05 wt.%) after 30 min of dealloying at 1150 K. The properties of the porous layer (e.g., layer thickness) can be tuned by varying the dealloying conditions. In-vitro tests suggest improved bone formation on the functionalized porous surface of the Ti-6Al-7Nb alloy.

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Mechanical and Corrosion Behavior of New Generation Ti-45Nb Porous Alloys Implant Devices

Cited by 23 publications

References 42 publications

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Mechanical Properties of a Newly Additive Manufactured Implant Material Based on Ti-42Nb

Surface Functionalization of Biomedical Ti-6Al-7Nb Alloy by Liquid Metal Dealloying

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