Development of a flexible nanocomposite TiO2 film as a protective coating for bioapplications of superelastic NiTi alloys

Aun, Diego Pinheiro; Houmard, Manuel; Mermoux, Michel; Latu-Romain, L.; Joud, J.C.; Berthomé, G.; Buono, Vicente Tadeu Lopes

doi:10.1016/j.apsusc.2016.03.064

Cited by 38 publications

(21 citation statements)

References 28 publications

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“…Also, film flexibility and adhesion was studied on the superelastic NiTi strips by three-points bending test. In agreement with this previous work, the film in this nanocomposite bi-layer configuration could sustain up to 6.4% strain without cracking, being the deformation of the porous amorphous layer mainly responsible for the flexibility and the crystalline layer responsible to sustain the imposed flexural stresses [24].…”

Section: Discussionsupporting

confidence: 79%

“…When cooled to room temperature, the NiTi alloy will contract, leaving the film in a compressive state, which is ideal to avoid crack formation. Results from transmission electron microscopy performed in cross-sections of the coated NiTi strips showed that the TiO 2 film formed after the thermal treatment at 500°C for 10 min is a bilayer with a total thickness of~100 nm, composed by a top surface layer of amorphous material with~50 nm and a bottom layer at the substrate/film interface formed of a mixture of anatase and rutile with grain sizes ranging from 10 to 50 nm (nanocomposite film) [24]. An epitaxial influence on the alloy/film interface starts the anatase to rutile transformation at lower temperatures in this region [24,29].…”

Section: Discussionmentioning

confidence: 99%

“…In order to facilitate the film characterization, the deposition route described in Section 2.1 was previously tested to coat superelastic NiTi strips in another study performed by the group [24]. The thermal treatment used to dry the oxide layer was chosen after several tests to obtain the maximum film flexibility.…”

Section: Discussionmentioning

confidence: 99%

“…The sol-gel solution was prepared according to the method described in ref. [23,24], generating a translucent dispersion that was stable for a period more than 4 months. Prior to deposition, samples were ultrasonically cleaned for 5 min in a 1/1 vol.…”

Section: Sol-gel Depositionmentioning

confidence: 97%

“…This treatment produces a light blue TiO 2 film on the surface of the samples, and glazing incidence X-ray diffraction (GIXRD) revealed that it was amorphous. Maximum flexibility of the oxide layer was achieved with a nanocomposite; part amorphous, part crystalline film, as described elsewhere [24]. The semi-crystallization of the TiO 2 layer was performed in a pre-heated oven at 500°C for 10 min.…”

Section: Sol-gel Depositionmentioning

confidence: 99%

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Enhancement of NiTi superelastic endodontic instruments by TiO2 coating

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Materials Science and Engineering: C

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Sol-gel Depositionmentioning

confidence: 97%

Section: Sol-gel Depositionmentioning

confidence: 99%

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Enhancement of NiTi superelastic endodontic instruments by TiO2 coating

Aun

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et al. 2016

Materials Science and Engineering: C

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Atomic configuration, electronic structure, and work of adhesion of TiN(111)//B2‐NiTi(110) and TiN(111)//B19′‐NiTi(010) interfaces: Insights from first‐principles simulations

Xie

Wang

Wei

et al. 2022

Surface & Interface Analysis

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In this paper, the atomic configuration, electronic structure, and work of adhesion for TiN(111)//B2‐NiTi(110) and TiN(111)//B19′‐NiTi(010) interfaces were investigated by first‐principles calculations based on density functional theory (DFT), which aim to provide a theoretical guidance for analyzing the service reliability of TiN films modified NiTi alloy devices. The results of this paper indicated that a hollow‐site stacking structure was formed on the interface when Ti and N were the terminal atoms on two sides. Such interfaces demonstrated a stronger bonding performance and a more stable structure than that with Ni and Ti as the terminal atoms. The work of adhesion of the TiN(111)//B19′‐NiTi(010) interface was 17.47 J/m2, which is greater than the work of fracture of TiN(111) (6.73 J/m2), whereas the work of adhesion of the TiN(111)//B2‐NiTi(110) interface was found to reach 5.49 J/m2, which is lower than the work of fracture of TiN(111). The models of the work of adhesion between the two interfaces indicate that there are significant bond strength changes in the TiN/NiTi interface, when the NiTi substrate undergoes martensitic transformation. The results of this paper contribute significantly to the service reliability analysis of TiN films coated on NiTi alloy devices.

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Investigation into microdefects and corrosion resistance of nickel-titanium shape memory alloy using electrical discharge coating process

Mansor,

Azmi,

Ismail

2024

Int J Adv Manuf Technol

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Nickel-titanium shape memory alloy is a novel material with outstanding properties suitable for biomedical applications such as implantation devices. Unfortunately, the high composition of nickel in this alloy can be harmful to human body, if its exposure exceeds a threshold value.Therefore, an innovative electrical discharge coating technique was investigated and proposed in this study to develop minimal microdefects formation with high corrosion resistance through fractional factorial design of experiment. The results showed that discharge duration mostly dominated the material deposition, microcracks, and porosity fraction up to 72%, due to the impact of the intensity of discharge energy. There was also a pronounced effect of titanium powder concentration in the deionized water on the percentage of titanium and nickel elements, and microcracks formation. The powder suspension enhanced the recast layer formation through the increment of layer density, which covered up the Ni-rich region and diminished the microcrack formation. An optimized substrate recorded the lowest corrosion current, I corr and highest corrosion voltage, E corr at 3.43 x 10 -6 µA/cm² and -0.07 V respectively, thus exhibited an outstanding corrosion resistance rate at only 8.57 µm/year in phosphate-buffered saline solution, due to the low nickel, microcracks and porosity fraction in the recast layer.

show abstract

Development of a flexible nanocomposite TiO2 film as a protective coating for bioapplications of superelastic NiTi alloys

Cited by 38 publications

References 28 publications

Enhancement of NiTi superelastic endodontic instruments by TiO2 coating

Enhancement of NiTi superelastic endodontic instruments by TiO2 coating

Atomic configuration, electronic structure, and work of adhesion of TiN(111)//B2‐NiTi(110) and TiN(111)//B19′‐NiTi(010) interfaces: Insights from first‐principles simulations

Investigation into microdefects and corrosion resistance of nickel-titanium shape memory alloy using electrical discharge coating process

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