Tribocorrosion of Ti6Al4V and NiCr Implant Alloys: Effect of Galvanic Interaction

AbstractThe authors report on the results of surface treatment experiments using a solid-state amplified laser source emitting laser pulses with a pulse duration of 10 ps. The laser source allows the generation of pulse trains (bursts) with an intra-burst pulse repetition rate of 80 MHz (pulse-to-pulse time interval about 12.5 ns) with up to eight pulses per burst. In this study a wavelength of 1064 nm was used to investigate both ablation of material and laser-induced surface modifications occuring in metallic implant alloys CoCrMo (cobalt-chromium-molybdenum) and TiAlV (titanium-aluminum-vanadium) in dependence of the number of pulses and fluences per pulse in the burst. By using the burst mode, a smoothing effect occurs in a certain parameter range, resulting in very low surface roughness of the generated microstructures. It is demonstrated that at fluences per pulse which are smaller than the material-specific ablation threshold, a self-organized pore formation takes place if a defined number of pulses per burst is used. Thus, the advantage of the MHz burst mode in terms of a possible surface modification is established.

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3903. Mechanical properties on ion-beam-textured surgical implant alloys. (USA)

Vacuum ◽

10.1016/s0042-207x(79)80791-5 ◽

1979 ◽

Vol 29 (4-5) ◽

pp. 189

Keyword(s):

Mechanical Properties ◽

Ion Beam ◽

Surgical Implant ◽

Implant Alloys

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Effects of thermomechanical history and environment on the fatigue behavior of (β)-Ti-Nb implant alloys

MATEC Web of Conferences ◽

10.1051/matecconf/201816506001 ◽

2018 ◽

Vol 165 ◽

pp. 06001 ◽

Cited By ~ 2

Author(s):

André Reck ◽

Stefan Pilz ◽

Ulrich Thormann ◽

Volker Alt ◽

Annett Gebert ◽

...

Keyword(s):

Fatigue Strength ◽

Cyclic Loading ◽

Fatigue Behavior ◽

Fatigue Tests ◽

Grain Structure ◽

Fatigue Properties ◽

Β Phase ◽

Α Phase ◽

Nb Content ◽

Implant Alloys

This study examined the fatigue properties of a newly developed cast and thermomechanical processed (β)-Ti-40Nb alloy for a possible application as biomedical alloy due to exceptional low Young’s modulus (64-73 GPa), high corrosion resistance and ductility (20-26%). Focusing on the influence of two microstructural states with fully recrystallized β-grain structure as well as an aged condition with nanometer-sized ω-precipitates, tension-compression fatigue tests (R=-1) were carried out under lab-air and showed significant differences depending on the β-phase stability under cyclic loading. Present ω- precipitates stabilized the β-phase against martensitic α’’ phase transformations leading to an increased fatigue limit of 288 MPa compared to the recrystallized state (225 MPa), where mechanical polishing and subsequent cyclic loading led to formation of α’’-phase due to the metastability of the β-phase. Additional studied commercially available (β)-Ti-45Nb alloy revealed slightly higher fatigue strength (300 MPa) and suggest a change in the dominating cyclic deformation mechanisms according to the sensitive dependence on the Nb-content. Further tests in simulated body fluid (SBF) at 37°C showed no decrease in fatigue strength due to the effect of corrosion and prove the excellent corrosion fatigue resistance of this alloy type under given test conditions.

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Crevice Corrosion of Implant Alloys—A Comparison of

Corrosion and Degradation of Implant Materials ◽

10.1520/stp35947s ◽

2009 ◽

pp. 229-229-16 ◽

Cited By ~ 3

Author(s):

BC Syrett ◽

EE Davis

Keyword(s):

Crevice Corrosion ◽

Implant Alloys

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AC AND DC METHODS FOR CORROSION RATE DETERMINATION OF POROUS IMPLANT ALLOYS

Biomedical Engineering IV ◽

10.1016/b978-0-08-033137-9.50026-9 ◽

1985 ◽

pp. 99-102 ◽

Cited By ~ 1

Author(s):

K.J. Bundy ◽

R. Luedemann ◽

C. Williams

Keyword(s):

Corrosion Rate ◽

Porous Implant ◽

Implant Alloys

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Biological Properties of Ti-Nb-Zr-O Nanostructures Grown on Ti35Nb5Zr Alloy

Journal of Nanomaterials ◽

10.1155/2012/834042 ◽

2012 ◽

Vol 2012 ◽

pp. 1-7 ◽

Cited By ~ 7

Author(s):

Zhaohui Li ◽

Congqin Ning ◽

Dongyan Ding ◽

Hegang Liu ◽

Lin Huang

Keyword(s):

Stem Cell ◽

Drug Release ◽

Drug Loading ◽

Biological Properties ◽

Prolonged Release ◽

Apatite Formation ◽

Release Process ◽

Oxide Nanostructures ◽

Implant Alloys

Surface modification of low modulus implant alloys with oxide nanostructures is one of the important ways to achieve favorable biological behaviors. In the present work, amorphous Ti-Nb-Zr-O nanostructures were grown on a peak-aged Ti35Nb5Zr alloy through anodization. Biological properties of the Ti-Nb-Zr-O nanostructures were investigated throughin vitrobioactivity testings, stem cell interactions, and drug release experiments. The Ti-Nb-Zr-O nanostructures demonstrated a good capability of inducing apatite formation after immersion in simulated body fluids (SBFs). Drug delivery experiment based on gentamicin and the Ti-Nb-Zr-O nanostructures indicated that a high drug loading content could result in a prolonged release process and a higher quantity of drug residues in the oxide nanostructures after drug release. Quick stem cell adhesion and spreading, as well as fast formation of extracellular matrix materials on the surfaces of the Ti-Nb-Zr-O nanostructures, were found. These findings make it possible to further explore the biomedical applications of the Ti-Nb-Zr-O nanostructure modified alloys especially clinical operation of orthopaedics by utilizing the nanostructures-based drug-release system.

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