Gum Metal thin films obtained by magnetron sputtering of a Ti-Nb-Zr-Ta target

Achache, Sofiane; Lamri, Salim; Alhussein, Akram; Billard, Alain; François, Manuel; Sanchette, Frédéric

doi:10.1016/j.msea.2016.07.096

Cited by 22 publications

(11 citation statements)

References 36 publications

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“…As it can be seen from Figure 7, all the indentations generate a plastic radio, Rp, greater than the coating thickness, t, and therefore the substrate contribution that is exercised over the hardness and modulus measurements must be removed to evaluate real mechanical properties. This may be a priori surprising; typically; when the bias voltage increases, hardness values tend to follow the same trend due to increase in the magnitude of the residual compression stresses [ 24 ]. Opposite behavior observed in present study corroborates finding from XRD and TEM, where a higher α" martensite phase content with the increase of bias voltage was observed.…”

Section: Mechanical Characterizationsupporting

confidence: 84%

Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

et al. 2018

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Ideal biomaterials to fabricate orthopedic implants, especially for load-bearing joint replacements, should include only non-toxic elements with good biocompatibility, high corrosion resistance and surface bioactivity, together with a good combination of mechanical properties. Based on these criteria, a manufacturing approach based on sputtering techniques can be ideal to develop coatings free of toxic elements tailored for advanced applications on pure titanium or titanium alloys used in biomedical applications. In this work, the ternary Ti-Nb-Zr system was used to develop non-toxic rich Ti coatings with several complex microstructures by careful control of Nb and Zr concentration and deposition parameters, such as bias voltage. Depending on the alloy

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Section: Mechanical Characterizationsupporting

confidence: 84%

Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

et al. 2018

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“…; TiO 2 -Cu and Cu, Ti, Nb and their oxides were developed and investigated for their antibacterial properties. Achache et al [13,14] have recently reported the mechanical properties of super-elastic Ti-based gum metal thin films showing increased bacterial inactivation properties and biocompatibility [15,16]. The present study focuses on the effect of copper content on the structure, morphology and mechanical properties of these asdeposited films.…”

Section: Introductionmentioning

confidence: 91%

Beneficial effect of Cu on Ti-Nb-Ta-Zr sputtered uniform/adhesive gum films accelerating bacterial inactivation under indoor visible light

Alhussein

Achache

Déturche

et al. 2017

Colloids and Surfaces B: Biointerfaces

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a b s t r a c tThis article presents the evidence for the significant effect of copper accelerating the bacterial inactivation on Ti-Nb-Ta-Zr (TNTZ) sputtered films on glass up to a Cu content of 8.3 at.%. These films were deposited by dc magnetron co-sputtering of an alloy target Ti-23Nb-0.7Ta-2Zr (at.%) and a Cu target. The fastest bacterial inactivation of E. coli on this later TNTZ-Cu surface proceeded within ∼75 min. The films deposited by magnetron sputtering are chemically homogenous. The film roughness evaluated by atomic force spectroscopy (AFM) on the TNTZ-Cu 8.3 at.% Cu sample presented an RMS-value of 20.1 nm being the highest RMS of any Cu-sputtered TNTZ sample. The implication of the RMS value found for this sample leading to the fastest interfacial bacterial inactivation kinetics is also discussed. Values for the Young's modulus and hardness are reported for the TNTZ films in the presence of various Cu-contents. Evaluation of the bacterial inactivation kinetics of E. coli under low intensity actinic hospital light and in the dark was carried out. The stable repetitive bacterial inactivation was consistent with the extremely low Cu-ion release from the samples of 0.4 ppb. Evidence is presented by the bacterial inactivation dependence on the applied light intensity for the intervention of Cu as semiconductor CuO during the bacterial inactivation at the TNTZ-Cu interface. The mechanism of CuO-intervention under light is suggested based on the pH/and potential changes registered during bacterial disinfection.

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“…The residual stresses are measured from an iron-substrate curvature before and after deposition, using an Altisurf profilometer. The stress was then calculated using Stoney's equation [28], as in [29].…”

Section: Depositionmentioning

confidence: 99%

The Structure, Morphology, and Mechanical Properties of Ta-Hf-C Coatings Deposited by Pulsed Direct Current Reactive Magnetron Sputtering

et al. 2020

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Ta, Hf, TaCx, HfCx, and TaxHf1-xCy coatings were deposited by reactive pulsed Direct Current (DC) magnetron sputtering of Ta or Hf pure metallic targets in Ar plus CH4 gas mixtures. The properties have been investigated as a function of the carbon content, which is tuned via the CH4 flow rate. The discharge was characterized by means of Optical Emission Spectroscopy and, in our conditions, both Ta-C and Hf-C systems seem to be weakly reactive. The structure of the as-deposited pure tantalum film is metastable tetragonal β-Ta. The fcc-MeCx carbide phases (Me = Ta or Hf) are {111} textured at low carbon concentrations and then lose their preferred orientation for higher carbon concentrations. Transmission Electron Microscopy (TEM) analysis has highlighted the presence of an amorphous phase at higher carbon concentrations. When the carbon content increases, the coating’s morphology is first compact-columnar and becomes glassy because of the nano-sized grains and then returns to an open columnar morphology for the higher carbon concentrations. The hardness and Young’s modulus of TaCx coatings reach 36 and 405 GPa, respectively. For HfCx coatings, these values are 29 and 318 GPa. The MeCx coating residual stresses increase with the addition of carbon (from one-hundredth of 1 MPa to 1.5 GPa approximately). Nevertheless, the columnar morphology at a high carbon content allows the residual stresses to decrease. Concerning TaxHf1-xCy coatings, the structure and the microstructure analyses have revealed the creation of a nanostructured coating, with the formation of an fcc superlattice. The hardness is relatively constant independently of the chemical composition (22 GPa). The residual stress was strongly reduced compared to that of binary carbides coatings, due to the rotation of substrates.

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Gum Metal thin films obtained by magnetron sputtering of a Ti-Nb-Zr-Ta target

Cited by 22 publications

References 36 publications

Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

Beneficial effect of Cu on Ti-Nb-Ta-Zr sputtered uniform/adhesive gum films accelerating bacterial inactivation under indoor visible light

The Structure, Morphology, and Mechanical Properties of Ta-Hf-C Coatings Deposited by Pulsed Direct Current Reactive Magnetron Sputtering

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