Mechanical and barrier properties of MOCVD processed alumina coatings on Ti6Al4V titanium alloy

Balcaen, Yannick; Radutoiu, Nicoleta; Alexis, Joël; Béguin, Jean-Denis; Lacroix, Loïc; Samélor, Diane; Vahlas, Constantin

doi:10.1016/j.surfcoat.2011.09.056

Cited by 46 publications

(36 citation statements)

References 16 publications

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“…The main part of the coating serves as a reservoir of Ag NPs, which are exposed to the water through the evolving free surface during the lifetime of the low wear resistant coating. Indeed, the hardness H and the elastic modulus E of a-Al 2 O 3 are 10.8 ± 0.8 GPa and 155 ± 6 GPa, respectively [18]. The resulting value of the elastic strain to failure H 3 /E 2 which is an indicator of wear resistance [19] equals 0.05 GPa.…”

Section: Introductionmentioning

confidence: 95%

Nanocomposite thin film of Ag nanoparticles embedded in amorphous Al 2 O 3 on optical sensors windows: Synthesis, characterization and targeted application towards transparency and anti-biofouling

Tendero

Lazar

Samélor

et al. 2017

Surface and Coatings Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Nanocomposite thin film of Ag nanoparticles embedded in amorphous Al 2 O 3 on optical sensors windows: Synthesis, characterization and targeted application towards transparency and anti-biofouling t r a c tIncreased motivation for environmental monitoring requires robust and reliable sensors. The present work aims at increasing the service time of optical sensors immersed in riverine waters by decreasing the development of biofouling on their surface. In this aim, nanocomposite coatings composed of metallic silver nanoparticles embedded in an amorphous alumina are co-deposited on sensor glass windows by chemical vapor deposition. Immersion for one week in the Saulx river, France, revealed a threefold decrease of biofouling on their surface compared with untreated glass surfaces while maintaining transparency. Such coatings can be considered as part of integrated tools, including for example mechanical cleaning, to reduce the maintenance of optical sensors immerged in riverine waters.

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Section: Introductionmentioning

confidence: 95%

Nanocomposite thin film of Ag nanoparticles embedded in amorphous Al 2 O 3 on optical sensors windows: Synthesis, characterization and targeted application towards transparency and anti-biofouling

Tendero

Lazar

Samélor

et al. 2017

Surface and Coatings Technology

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“…The coating surface is smooth but slightly porous with nanosized cavities over the entire height (Figure 3 b), in contrast with alumina coatings deposited from vaporized ATI which are very smooth and dense. [ 27 ] This particular morphology is attributed to the presence of cyclohexane in the DLI process possibly resulting from steric hindrance during the coating growth.…”

Section: Composition and Morphology Of Amorphous Alumina Coatingsmentioning

confidence: 99%

Amorphous Alumina Barrier Coatings on Glass: MOCVD Process and Hydrothermal Aging

Etchepare

Baggetto

Vergnes

et al. 2016

Adv Materials Inter

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 15772 [ 9 ] radio frequency magnetron sputtering, [ 2 ] atomic layer deposition, [ 10 ] sol-gel, [ 5 ] and metalorganic chemical vapor deposition (MOCVD). [ 7,[11][12][13] CVD is one of the most attractive techniques for the time effi cient deposition of such coatings on complexin-shape geometries with conformal coverage, i.e., uniform thickness along the surface. Composition, stoichiometry, crystallinity, and microstructure of the material can be adjusted by fi ne tuning of the MOCVD experimental parameters such as reactor design, precursor selection, reactive atmosphere, deposition temperature, and pressure. The MOCVD of alumina from vaporized aluminum tri-isopropoxide (ATI) is very well documented. [ 7,8,[11][12][13][14][15][16] ATI yields amorphous and stoichiometric alumina coatings with a smooth and dense microstructure at 5 Torr in the temperature range 420 to 650 °C. [ 7,8,14,15 ] Higher process temperatures lead to the deposition of nanocrystallized γ -Al 2 O 3 [ 15 ] or to the homogeneous decomposition of ATI, which generates a different microstructure. [ 11 ] The ATI molecule is well described in the literature.[ 17 ] It is sensitive to water vapor and thus it is subjected to ageing upon exposure to ambient atmosphere, which results in its partial or total hydrolysis in nonvolatile compounds, Al(O i Pr) 3− n (OH) n ( n = 1, 2) and Al(OH) 3 , respectively. [ 12,17 ] The precursor is usually melted, maintained in supercooled state, and vaporized with a bubbler.Despite the simplicity and the cost effectiveness of this solution, the use of ATI in the supercooled state has two drawbacks. First, maintaining ATI at the vaporization temperature for a long-period impacts the stability of the molecule and subsequently the coating quality. [ 12 ] Second, it is diffi cult to know exactly the mass fl ow rate of the generated reactive gas. Such poorly controlled transport conditions lead to nonreproducible processes, especially for the present case when low activation energy prevails in the entire temperature range of interest, de facto resulting in mass transport limited process. The direct liquid injection (DLI) technology overcomes these drawbacks with the controlled vaporization of the solution made of ATI dissolved in a carrier solvent. [ 18 ] The DLI of ATI is insuffi ciently documented in the literature. Song et al. [ 19 ] and Krumdieck et al. [ 13 ] implemented the technique in a pulsedpressure MOCVD process. The authors used a solution of ATI in n -octane and in dry toluene, respectively. Coatings obtained

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“…The results reveal that it exhibits high hydrophobicity with water (contact angle of 135.5±3.3°) and meets the requirements of cytotoxicity test using the ISO 10993-5 elution method. Implementation of different aluminium coatings was also studied on commercial Ti 6 Al 4 V titanium alloy to enhance its high temperature corrosion resistance by metal-organic chemical vapor deposition from aluminum triisopropoxide [35]. The mechanical and adhesion properties to substrates were evaluated by indentation, scratch and micro tensile tests.…”

Section: Ultra-high Molecular Weight Polyethylene (Uhmwpe) Coatingmentioning

confidence: 99%

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

Annamalai¹,

Kavitha²,

Ramji³

2014

TOMSJ

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Abstract:The alloy Ti 6 Al 4 V has evolved as a good biomedical material, by virtue of its bio-compatibility. In order to make implants out of this material, it has to be shaped and processed. Shaping this material by conventional manufacturing methods like machining, welding and brazing presents a huge challenge. This challenge has been met by various approaches like additive manufacturing, surface alloying and heat treatment. Additive manufacturing processes are used for shaping; coatings and surface alloying are used for property improvement; heat treatment is used for improving the machinability. The processing method has an impact on the final properties of the product. This review attempts to trace the development of methods and practices for converting Ti 6 Al 4 V into a useful material for biomedical applications.

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Mechanical and barrier properties of MOCVD processed alumina coatings on Ti6Al4V titanium alloy

Cited by 46 publications

References 16 publications

Nanocomposite thin film of Ag nanoparticles embedded in amorphous Al 2 O 3 on optical sensors windows: Synthesis, characterization and targeted application towards transparency and anti-biofouling

Nanocomposite thin film of Ag nanoparticles embedded in amorphous Al 2 O 3 on optical sensors windows: Synthesis, characterization and targeted application towards transparency and anti-biofouling

Amorphous Alumina Barrier Coatings on Glass: MOCVD Process and Hydrothermal Aging

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

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