Structure and properties of composite surface layers produced on NiTi shape memory alloy by a hybrid method

Witkowska, Justyna; Sowińska, Agnieszka; Czarnowska, E.; Płociński, Tomasz; Rajchel, B.; Tarnowski, Michał; Wierzchoń, T.

doi:10.1007/s10856-018-6118-5

Cited by 15 publications

(10 citation statements)

References 42 publications

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“…The Raman spectra of both the layers revealed the structure of amorphous carbon on the surface that was presented and described in the earlier publications [25,26]. In the coating produced by the RFCVD method, the concentration ratio of sp3 to sp2 bonds was about 50% [24], and in the IBAD coating – about 40% [25].…”

Section: Resultsmentioning

confidence: 77%

Microstructural and corrosion resistance characterisation of NiTi shape memory alloy modified at low-temperature plasma with carbon coatings produced via RFCVD and IBAD methods

Witkowska

Kamiński

Płociński

et al. 2019

Corrosion Engineering, Science and Technology

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NiTi shape memory alloy, both before and after low-temperature oxynitriding under glow discharge conditions combined with the production of a nano-sized outer carbon coating, was investigated. The study compares two types of carbon coatings: produced via the RFCVD (radio frequency chemical vapour deposition) and IBAD (ion beam-assisted deposition) methods. The latter was also enriched by randomly distributed silver nanoparticles. The study showed slight changes in roughness parameters and increased corrosion resistance after surface treatment processes. The largest impedance module and corrosion potential and the smallest density of corrosion current were achieved for samples with a carbon coating produced via the RFCVD process. The presented surface modifications using hybrid processes can extend the use of NiTi alloy in medicine due to the increased biocompatibility.

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Section: Resultsmentioning

confidence: 77%

Microstructural and corrosion resistance characterisation of NiTi shape memory alloy modified at low-temperature plasma with carbon coatings produced via RFCVD and IBAD methods

Witkowska

Kamiński

Płociński

et al. 2019

Corrosion Engineering, Science and Technology

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“…Witkowska et al [53] coated composite surface layers (a-C(Ag)+-TiO 2 ) on NiTi using ion beam assisted deposition. It was found that the produced hybrid surface exhibited improved corrosion resistance, surface roughness, altered surface free energy, and wettability, as well as decreased platelet activation, aggregation, and adhesion compared to the uncoated alloy in the initial state.…”

Section: Shape Memory Alloys For Vascular Stentsmentioning

confidence: 99%

Self-expanding stents based on shape memory alloys and shape memory polymers

Omid

Goudarzi

Kangarshahi

et al. 2020

jcc

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A stenotic vessel can be opened using net-shape tubes called "stents" leading to the restoration of the bloodstream.Compared to the commonly used stainless steel stent, self-expandable stents have some advantages. They do not suffer from the risks of damage to the vascular tissue due to the balloon expansion. Moreover, overexpansion for compensating the elastic recoil is not needed, and there is no constant force applied on the artery until the occlusion of the device by the artery stops. However, the stent cannot restore the original dimensions of the vessel in the case of calcified plaques. Self-expandable stents can be utilized for the treatment of atherosclerotic lesions in the carotid, coronary, and peripheral arteries. Shape memory alloys (SMAs), mainly NiTi (nitinol), are employed for self-expandable vascular stent applications. Nitinol is widely applied for medical devices and implants due to its excellent fatigue performance, mechanical properties, and biocompatibility, which make this alloy suitable for long-term installations. Other materials used for self-expandable cardiovascular stents are shape memory polymers (SMPs). Shape memory effect is triggered by the hydration of polymers or temperature change preventing the collapse of small blood vessels. This review has focused on the mechanisms and properties of SMAs and SMPs as promising materials for stent application.

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“…T itanium nickelide is quite a widespread material in medicine as it combines both bioactive and bioinert properties, including high corrosion resistance, good biochemical compatibility with body tissues, superelasticity and a shape memory effect [1][2][3][4][5][6][7][8][9][10][11][12]. The combination of all these properties makes titanium nickelide extremely popular in medicine.…”

Section: Introductionmentioning

confidence: 99%

Structure and strength of biocompatible coatings for titanium nickelide obtained in different reaction atmospheres

Dubovikov¹,

Garin²,

Shishelova³

et al. 2022

nfm

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The three layers Ti/Ni/Ti amorphous nanolaminate was applied to the TiNi substrate by magnetron sputtering. But subsequent synthesis provided in nitrogen and argon-nitrogen-carbonium dioxide atmospheres changed their phase composition and structure. The coating synthesized in nitrogen atmosphere consists mostly of the titanium nitrides but not from titanium oxides which were formed during synthesis in argon-nitrogen-carbonium dioxide atmosphere. Despite the fact that the nitrides have great hardness the scratch tests showed the coating synthesized in argon-nitrogencarbonium dioxide atmosphere has better adhesion to the substrate. The load of 30 N is not enough for complete delamination of the coating. The results obtained with the aid of tensile tests demonstrated that the coating thickness less than 250 nm does not affect significantly on martensitic deformation of the TiNi phase.

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Structure and properties of composite surface layers produced on NiTi shape memory alloy by a hybrid method

Cited by 15 publications

References 42 publications

Microstructural and corrosion resistance characterisation of NiTi shape memory alloy modified at low-temperature plasma with carbon coatings produced via RFCVD and IBAD methods

Microstructural and corrosion resistance characterisation of NiTi shape memory alloy modified at low-temperature plasma with carbon coatings produced via RFCVD and IBAD methods

Self-expanding stents based on shape memory alloys and shape memory polymers

Structure and strength of biocompatible coatings for titanium nickelide obtained in different reaction atmospheres

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