Simultaneous improvement of corrosion resistance and bioactivity of a titanium alloy via wet and dry plasma treatments

Kaseem, Mosab; Choe, Han-Choel

doi:10.1016/j.jallcom.2020.156840

Cited by 51 publications

(15 citation statements)

References 61 publications

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“…The relatively high melting point (more than 1650 °C) makes titanium useful as a refractory metal. In addition, titanium and its alloys have good corrosion resistance [ 8 , 9 ]. However, the vital drawbacks of titanium and its alloys cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductance of Graphene-Titanium Interface: A Molecular Simulation

Yan

Wang

et al. 2022

Molecules

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Titanium is a commonly used material in aviation, aerospace, and military applications, due to the outstanding mechanical properties of titanium and its alloys. However, its relatively low thermal conductivity restricts its extended usage. The use of graphene as a filler shows great potential for the enhancement of thermal conductivity in titanium-based metal-matrix composites (MMCs). We used classical molecular dynamics (MD) simulation methods to explore the thermal conductance at the titanium–graphene (Ti/Gr) interface for its thermal boundary conductance, which plays an important role in the thermal properties of Ti-based MMCs. The effects of system size, layer number, temperature, and strain were considered. The results show that the thermal boundary conductance (TBC) decreases with an increasing layer number and reaches a plateau at n = 5. TBC falls under tensile strain and, in turn, it grows with compressive strain. The variation of TBC is explained qualitatively by the interfacial atomic vibration coupling factor. Our findings also provide insights into ways to optimize future thermal management based on Ti-based MMCs materials.

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Section: Introductionmentioning

confidence: 99%

Thermal Conductance of Graphene-Titanium Interface: A Molecular Simulation

Yan

Wang

et al. 2022

Molecules

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“…By the way, numerous forms of corrosion damage were reported on the PEO treated surfaces due to the microcracks caused by thermal shock [ 18 , 28 , 51 , 66 , 67 ]. Of course, surface cracks could also be seen in the coatings reinforced with GNS during the PEO.…”

Section: Resultsmentioning

confidence: 99%

Surface Properties of Graphene Functionalized TiO2/nHA Hybrid Coatings Made on Ti6Al7Nb Alloys via Plasma Electrolytic Oxidation (PEO)

et al. 2021

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Nano-hydroxyapatite (nHA)-matrix coatings containing graphene nanosheets (GNS)-nHA were coated on Ti6Al7Nb alloys by plasma electrolytic oxidation (PEO) treatment for the improvement of their surface properties. Crystallographic properties, functional groups, and elemental analysis of coatings were characterized by XRD, ATR–FTIR, and EDS analysis. Surface morphological changes of the coated surfaces were investigated by AFM and SEM. The electrochemical corrosion behavior of the coatings was examined by using the potentiodynamic scanning (PDS) tests under in-vitro conditions in simulated body fluid (SBF). The results showed that the GNS was successfully deposited in ceramic matrix coatings on Ti6Al7Nb alloys. Also, the microstructural observations revealed that the coatings have a porous and rough structure. The XRD and ATR–FTIR quantitative analysis have proved the appearance of HA and GNS in the coating layers. An increase in the coating thickness, surface hardness, and anatase/rutile transformation rate was determined, while the GNS ratio in the coating layers was increased. The microhardness of the nHA coating reinforced with 1.5 wt% GNS was measured at 862 HV, which was significantly higher than that of GNS-free (only nHA) coating (584 HV). The best in-vitro resistance to corrosion in SBF was observed in the nHA/1.5GNS wt% coating.

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“…One of the important advantages of the coatings made by the hydrothermal method compared to other methods is that the Ca/P ratio can be adjusted more easily [ 32 , 49 ]. The Ca and P compounds added to the solution are adjusted according to the stoichiometric ratio before coating, and there are no major factors that can affect the Ca/P ratio during the coating.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal synthesis of nanocrystalline hydroxyapatite–graphene nanosheet on Ti-6Al-7Nb: mechanical and in vitro corrosion performance

Yiğit

Dikici

Özdemir

2021

J Mater Sci: Mater Med

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The hybrid coatings containing the graphene nano-sheet (GNS) and nano-hydroxyapatite (nHA) phases have been successfully synthesized on Ti6Al7Nb alloys by a one-step hydrothermal method. The hydrothermal reaction was carried out for 24 h at 200 °C. The GNS ratio has been altered as 1, 3, 5 and 7 wt.% in the coatings and, the results have compared with non- GNS containing coatings. The effect of the GNS ratio on the microstructure, hardness, and in vitro corrosion responses has been investigated in detail. The characterizations of the coatings were carried out by SEM, EDS, AFM, XRD and, FTIR. The corrosion behavior of the hybrid coatings was compared in Kokubo’s solution at 37 °C by using potentiodynamic polarization tests. The results showed that the hydroxyapatite phases were deposed on the graphene layers with nano-size nucleation with its Ca/P stoichiometric ratio. The best hydrophilicity (~52°) property has been obtained in nHA/3GNS coatings. In addition, the corrosion rates of coatings increased in the following order: nHA/3GNS < nHA/1GNS < nHA/7GNS < nHA/5GNS < only nHA.

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Simultaneous improvement of corrosion resistance and bioactivity of a titanium alloy via wet and dry plasma treatments

Cited by 51 publications

References 61 publications

Thermal Conductance of Graphene-Titanium Interface: A Molecular Simulation

Thermal Conductance of Graphene-Titanium Interface: A Molecular Simulation

Surface Properties of Graphene Functionalized TiO2/nHA Hybrid Coatings Made on Ti6Al7Nb Alloys via Plasma Electrolytic Oxidation (PEO)

Hydrothermal synthesis of nanocrystalline hydroxyapatite–graphene nanosheet on Ti-6Al-7Nb: mechanical and in vitro corrosion performance

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