Characterization of thermally oxidized Ti6Al7Nb alloy for biological applications

Çi̇menoǧlu, Hüseyin; Meydanoğlu, Onur; Baydoğan, Murat; Bermek, Hakan; Huner, Pinar; Kayalı, E. Sabri

doi:10.1007/s12540-011-1011-5

Cited by 21 publications

(6 citation statements)

References 32 publications

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“…This could be attributed to weak interaction (interfacial bonding) between the apatite layer and the surface of CoCr alloy. In the case of the oxidised sample, the apatite layer deposited on the TiO 2 layer was almost crackfree and stable (Figure3(b)), which indicates enhancement in the bioactivity of the CoCr alloy.Results of the SBF immersion test are in agreement with previous studies[26,33], which reported accelerated deposition of Ca and P rich precipitates on the TiO 2 layer. Since hydroxyapatite has a composition similar to that of bone, deposition of hydroxyapatite during SBF test is generally assumed as a primary indicator of a bioactive surface, which has high potential to lead a good bonding between the implant and the bone in vivo[34,35].…”

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confidence: 91%

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A novel fabrication method for a TiO₂ layer over CoCr alloy

Cetiner

Paksoy

Tazegul

et al. 2018

Surface Engineering

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This study has been initiated to form a TiO 2 layer having enhanced biological properties on the surface of a CoCr alloy, which is mostly used in manufacturing of orthopaedic implants. As a novel approach, CoCr alloy samples were first coated with titanium and then oxidised in air at 600°C for 60 h. Surface characterisation of the samples were made by structural surveys (scanning electron microscopic examinations, X-ray diffraction analyses), roughness and hardness measurements, bioactivity and wear tests. Results of the experiments have showed that fabrication of TiO 2 as the outermost surface layer caused remarkable increment in the wear resistance and the bioactivity of the CoCr alloy.

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“…In this respect, superior combination of corrosion and corrosion-wear resistances have been obtained from Ti6Al4V alloy after TO at 600°C for 60 h in normal atmospheric conditions [21]. These TO parameters also yielded superior corrosion-wear performance for the Ti6Al7Nb alloy [26].…”

Section: Introductionmentioning

confidence: 99%

A novel fabrication method for a TiO₂ layer over CoCr alloy

Cetiner

Paksoy

Tazegul

et al. 2018

Surface Engineering

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“…1,[6][7][8][9][10][11] The high corrosion resistance of titanium is related to its strong affinity to oxide and the formation on the surface of the metal of a stable and passive oxide layer, which closely adheres to the substrate. 12 There is a wide range of chemical compounds with which titanium and its alloys do not react. They are characterised by resistance to the action of chlorine compounds, sulphates and sulphides in a broad range of concentrations and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the tribological properties of oxide layers obtained via thermal oxidation on titanium Grade 2

Aniołek

Kupka

Barylski

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Thermal oxidation is an effective technique for modifying the surface of titanium and its alloys in order to improve their poor tribological properties. This paper presents the results of tests concerning titanium Grade 2 subjected to thermal oxidation at 600 ℃ and 700 ℃ for 72 h. The morphology of the surface of the formed oxide scale was determined. The surface of a specimen oxidised at 600 ℃ was unevenly covered by very fine oxide particles. Raising the temperature to 700 ℃ made it possible to cover the entire examined surface with an oxide layer. The obtained scale was characterised by the presence of large irregularly shaped agglomerated oxide particles. Tribological tests showed that the presence of an oxide layer on the surface of titanium significantly improved the resistance of the interacting tribological couple to sliding wear. The obtained 3D isometric images of the trace of wear showed that the formed traces differed in terms of width, depth and shape. It was shown that the area of the cross section of the trace of wear decreased as the temperature of thermal oxidation increased. Scanning electron microscopic observations of traces of wear formed following tribological interaction with an Al2O3 ball showed, in a non-oxidised specimen and a specimen oxidised at 600 ℃, the presence of alternating morphologically varied areas formed as a result of corrugation wear. The oxide layer obtained at 700 ℃ has the highest resistance to sliding wear and completely eliminates the adverse corrugation wear phenomenon.

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“…Among metallic materials, titanium and its alloys have the best biocompatibility, closely related to their corrosion resistance. High corrosion resistance is associated with the high affinity of titanium and its alloys for oxygen and the formation of a stable, self-passive oxide layer (2 to 10 nm thick) on the metal surface [10]. The natural oxide layer also plays a crucial role in biocompatibility and limits alloying ions' penetration into the body.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

et al. 2021

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Titanium and its alloys are among the most promising biomaterials for medical applications. In this work, the isothermal oxidation of Ti-6Al-7Nb biomedical alloy towards improving its mechanical properties, corrosion resistance, and bioactivity has been developed. The oxide layers were formed at 600, 700, and 800 °C for 72 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), 3D profilometry, and microindentation test, were used to characterize microstructure, surface geometrical structure, and the hardness of the diphase (α + β) Ti-6Al-7Nb alloy after oxidation, respectively. In vitro corrosion resistance tests were carried out in a saline solution at 37 °C using the open-circuit potential method and potentiodynamic measurements. Electronic properties in the air were studied using the Scanning Kelvin Probe (SKP) technique. The bioactivity test was conducted by soaking the alkali- and heat-treated samples in simulated body fluid for 7 days. The presence of apatite was confirmed using SEM/EDS and Fourier Transform Infrared Spectroscopy (FTIR) studies. The thickness of oxide layers formed increased with the temperature growth from 0.25 to 5.48 µm. It was found that with increasing isothermal oxidation temperature, the surface roughness, hardness, corrosion resistance, and contact potential difference increased. The Ti-6Al-7Nb alloy after oxidation revealed the HAp-forming ability in a biological environment.

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Characterization of thermally oxidized Ti6Al7Nb alloy for biological applications

Cited by 21 publications

References 32 publications

A novel fabrication method for a TiO₂ layer over CoCr alloy

A novel fabrication method for a TiO₂ layer over CoCr alloy

Characteristics of the tribological properties of oxide layers obtained via thermal oxidation on titanium Grade 2

Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

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Characterization of thermally oxidized Ti6Al7Nb alloy for biological applications

Cited by 21 publications

References 32 publications

A novel fabrication method for a TiO2 layer over CoCr alloy

A novel fabrication method for a TiO2 layer over CoCr alloy

Characteristics of the tribological properties of oxide layers obtained via thermal oxidation on titanium Grade 2

Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

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A novel fabrication method for a TiO₂ layer over CoCr alloy

A novel fabrication method for a TiO₂ layer over CoCr alloy